JP3073681B2 - Multi-point simultaneous measurement system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multipoint simultaneous measurement system suitable for measuring vibrations of large structures such as ships and bridges.

[0002]

2. Description of the Related Art A system shown in FIG. 9 and a system shown in FIG. 10 are conventionally known as multi-point simultaneous measurement systems for measuring vibrations of large structures such as ships and bridges. The multi-point simultaneous measurement system 101 shown in FIG. 9 includes a plurality of vibration sensors 102 installed at each observation point such as a bridge,
A plurality of coaxial cables 104 are connected to the receiving device 103 provided on the monitoring room side, and a vibration signal obtained by the measurement operation of each vibration sensor 102 is transmitted through each coaxial cable 104. , To the receiving device 103, and each amplifier 10 provided in the receiving device 103.
At 5, the vibration signals are amplified, respectively, and recorded by the recording analyzer 10.
This is recorded and analyzed in step 6. The multi-point simultaneous measurement system 110 shown in FIG. 10 includes a plurality of vibration measurement transmitters 111 installed at each observation point such as a bridge, and a receiver 112 provided on the monitoring room side with one coaxial cable. The connection is made at 113, the vibration signals obtained by the measurement operation of each vibration measurement transmitter 111 are converted into FM signals having mutually different carrier frequencies, transmitted to the receiving device 112, and the receiving device 112 side discriminates the frequency. , FM demodulation, and reproduces the vibration signal measured by each vibration measurement transmitter 111, and records and analyzes this.

In this case, each vibration measuring transmitter 111 includes a vibration sensor 114 for measuring the vibration at the observation point and an amplifier 1 for amplifying a vibration signal output from the vibration sensor 114.
15 and a frequency modulator 1 that FM-modulates a carrier having a predetermined frequency set for each vibration measuring transmitter 111 based on the vibration signal output from the amplifier 115.
A transmitter 11 for transmitting a transmission signal (an FM-modulated vibration signal) output from the frequency modulator 116 onto a coaxial cable 113 and transmitting the transmission signal to the receiver 112
7 and the power supply voltage supplied via the coaxial cable 113 to generate a power supply voltage having a preset voltage value, and the amplifier 115 and the frequency modulator 11
6, a stabilizing power supply 118 for supplying power to the transmitter 117. When a power supply voltage is supplied via the coaxial cable 113, the power supply voltage is used to measure the vibration at the installation location (observation point). On the basis of the above, a carrier having a different carrier frequency is FM-modulated for each vibration measuring transmitter 111 to generate a transmission signal, which is transmitted to the coaxial cable 113.
Is transmitted to the receiving device 112 via the.

[0004] The receiving device 112 is connected to the coaxial cable 11.
3 to supply a power supply voltage to each of the vibration measurement transmitters 11.
1 for supplying power to the coaxial cable 1
13, while taking in each transmission signal transmitted from each vibration measurement transmitter 111 and amplifying the same, the transmission signal output from this reception amplifier 121 is frequency-discriminated, and then FM demodulated. A plurality of vibration signal reproducers 122 for reproducing the vibration signals obtained by the vibration sensor 114 of each vibration measurement transmitter 111, and a record for recording and analyzing each vibration signal reproduced by each vibration signal reproducer 122. An analyzer 123 is provided. Then, while supplying a power supply voltage to each of the vibration measuring transmitters 111 via the coaxial cable 113, each of the vibration measuring transmitters 111
The transmission signal output from the transmitter is received, and the transmission signal transmitted from each of the vibration measurement transmitters 111 is discriminated by the respective vibration signal regenerators 122 including the band-pass filter 124, the demodulator 125, and the signal amplifier 126. , FM
The signal is demodulated to reproduce the vibration signal, which is recorded and analyzed.

[0005]

In the above-described conventional multi-point simultaneous measurement systems 101 and 110,
There were the following problems. That is, in the multi-point simultaneous measurement system 101 shown in FIG. 9, a plurality of vibration sensors 102 installed at each observation point and a receiving device 103 provided on the monitoring room side are connected by a plurality of coaxial cables 104, respectively. The coaxial cable 10
4 is troublesome, and the total amount of the coaxial cable 104 to be used becomes too long, resulting in a problem that the installation cost becomes enormous. In the multi-point simultaneous measurement system 110 shown in FIG. 10, the vibration measurement transmitter 111 installed at each observation point and the receiving device 112 provided on the monitoring room side are connected by one coaxial cable 113. Therefore, it is possible to save time and effort when installing the coaxial cable 113, and to shorten the total amount of the coaxial cable 113 to reduce the installation cost. However, in the multi-point simultaneous measurement system 110, the vibration signals continuously measured by the respective vibration measurement transmitters 111 are continuously transmitted to the receiving device 112. Unless the bandwidth of each output transmission signal is individually widened, the vibration signal obtained by the vibration sensor 114 of each vibration measurement transmitter 111 cannot be transmitted accurately.

Therefore, the bandwidth of the transmission signal output from each vibration measurement transmitter 111 is set so that the vibration signal obtained by each vibration measurement transmitter 111 can be accurately transmitted to the receiving device 112 side. However, the number of vibration measuring transmitters 111 cannot be increased due to the limitation of the transmission bandwidth of the coaxial cable 113. Therefore, when increasing the number of the vibration measuring transmitters 111, the band of the vibration signal obtained by each vibration sensor 114 provided in each of the vibration measuring transmitters 111 is narrowed and transmitted to the receiving device 112. There must be. Thereby, each vibration measuring transmitter 111 and the receiving device 112 are connected by one coaxial cable 113, so that the trouble of installing the coaxial cable 113 is omitted, the total amount of the coaxial cable 113 is shortened, and While lowering costs,
Even if the number of installed vibration measurement transmitters 111 is increased, the development of a multipoint simultaneous measurement system that can accurately transmit the vibration signal obtained by the vibration sensor 114 of each vibration measurement transmitter 111 to the receiving device 112 has been developed. It was strongly desired.

[0007] The present invention has been made in view of the above circumstances, and in claim 1, there is one communication between an observation point device provided for each observation point and a center device provided on the monitoring room side.
It is possible to save the trouble of installing the transmission cable by connecting with this transmission cable, shorten the total amount of transmission cable, reduce the installation cost, and freely change the sampling cycle etc. at the observation point equipment It is another object of the present invention to provide a multi-point simultaneous measurement system capable of collecting detailed data with a zoom-up function.
Further, according to claim 2, when the observation point device is a plurality of vibration measurement transmitters arranged along a path of a moving body, even if the number of vibration transmitters is increased, the transmission signals of each other are not changed. It is an object of the present invention to provide a multipoint simultaneous measurement system capable of reducing crosstalk. Furthermore, in claim 3, when the observation point device has a plurality of vibration measurement transmitters arranged along the path of the moving object, the sampling period is set to a predetermined value when passing through the moving object. It is an object of the present invention to provide a multi-point simultaneous measurement system that enables efficient observation by shortening the length.

[0008]

According to a first aspect of the present invention, there is provided an observation point device provided for each observation point, a center device provided on a monitoring room side, and In a multi-point simultaneous measurement system including an apparatus and one transmission cable connecting the observation point devices,
The observation point device has at least a function of changing a measurement sampling period or the like, and when a transmission instruction signal and a measurement sampling period instruction signal of the observation point device are transmitted from the center device to the observation point device. In the observation point device, the measurement is performed by changing to a sampling cycle corresponding to the instruction signal, and the measurement data is modulated and multiplexed by a preset modulation method and transmitted to the center via the transmission cable. Features. Claim 2
In the described multi-point simultaneous measurement system, the observation point device is:
It is characterized by comprising a plurality of vibration measuring transmitters arranged along the path of the moving body, and by arranging the frequencies so that the carrier frequencies of the modulation signals output from the adjacent vibration transmitting units are not adjacent to each other. Further, in the multi-point simultaneous measurement system according to claim 3, the observation point device includes a plurality of vibration measurement transmitters arranged along a path of the moving body and a moving body arranged at both ends of the moving body path. The center device monitors the output of the moving body passage detecting means, while the moving body passes through the moving body route,
An instruction signal is transmitted to the observation point device so as to change a sampling cycle and transmit a measurement result.

According to the above construction, according to the first aspect, an observation point device provided for each observation point, a center device provided on the monitoring room side, and one connecting device between the center device and each of the observation point devices. In the multi-point simultaneous measurement system including the transmission cable, when a transmission instruction signal and a measurement sampling cycle instruction signal of the observation point device are transmitted from the center device to the observation point device, the observation point device can be freely used. Since the measurement can be performed by changing the sampling cycle, while reducing the number of transmission cable laying man-hours and costs,
Detailed and accurate data collection becomes possible as needed.

According to a second aspect of the present invention, when the observation point device in the multi-point simultaneous measurement system according to the first aspect is a plurality of vibration measurement transmitters arranged along a path of a moving object, adjacent vibrations are transmitted. Since the carrier frequencies of the modulated signals output from the transmitters are arranged so that the carrier frequencies are not adjacent to each other, crosstalk between transmission signals can be reduced even if the number of vibration transmitters is increased.

According to a third aspect of the present invention, in the case where the observation point device is a plurality of vibration measuring transmitters arranged along the path of the moving object, the detection of the passage of the moving object arranged at both ends of the moving object path is performed. Means, wherein the center device monitors an output of the moving object passage detecting means, and changes a sampling cycle to the observation point device and transmits a measurement result while the moving object passes through the moving object path. Since the instruction signal has been transmitted to the mobile unit, detailed data is collected at the time of passing through the moving body, so that efficient observation can be performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a schematic configuration diagram showing one embodiment of a multipoint simultaneous measurement system according to the present invention.
The multi-point simultaneous measurement system 1 shown in this figure includes a plurality of vibration measurement transmitters 3a to 3n installed at each observation point of the bridge 2,
A center device 5 installed in the monitoring room 4 and the like, and one coaxial cable 6 for connecting the center device 5 to each of the vibration measuring transmitters 3a to 3n are provided. Then, the operation setting of each of the vibration measuring transmitters 3a to 3n is performed, and the vibration measuring transmitters 3a to 3n perform the vibration measurement. The center device is stored while storing the vibration data obtained by the vibration measuring operation. When the transmission instruction signal is output from the transmitter 5, the vibration measuring transmitters 3a to 3n output FM modulation signals having different carrier frequencies from each other, and the center device 5 takes in the signals and analyzes the recording. Each of the vibration measuring transmitters 3a to 3n includes a vibration sensor 7 for measuring vibration at a point (observation point) where the vibration measuring transmitters 3a to 3n are installed as shown in FIG. A / D for sampling and A / D converting a vibration signal output from the vibration sensor 7
While operating the conversion circuit 8 and the A / D conversion circuit 8 at a sampling period based on the operation setting conditions designated by the center device 5, the vibration data output from the A / D conversion circuit 8 is fetched. A process of storing a designated number in a FIFO (first-in first-out) format, a process of analyzing a command transmitted from the center device 5, and a process in which a transmission instruction signal is output from the center device 5 side. A CPU circuit 9 for performing processing for transmitting the stored vibration data, a ROM circuit 10 for storing a program for defining the operation of the CPU circuit 9 and various constant data, and a work area for the CPU circuit 9 Used as a storage area for vibration and vibration data
An AM circuit 11 is provided.

Further, each of the vibration measuring transmitters 3a to 3n includes:
Each receives a transmission signal transmitted on the coaxial cable 6, and FM-demodulates a transmission signal having a carrier of a predetermined frequency set in advance as shown in FIG. A receiver circuit 12 for supplying a command and a transmission instruction signal to the CPU circuit 9;
Based on the vibration data output from the PU circuit 9, a carrier having a frequency designated for each of the vibration measuring transmitters 3 a to 3 n is FM-modulated to generate a transmission signal (FM-modulated signal). 6, a transmitter circuit 13 to be transmitted to the center device 5 and a power supply voltage supplied through the coaxial cable 6 are taken in, and a stabilized power supply voltage having a preset voltage value is generated. And a stabilized power supply circuit 14 for supplying power to the vibration sensor 7 to the transmitter circuit 13 and the like.

Then, the power supply voltage supplied via the coaxial cable 6 is taken in, and the respective units of the vibration measuring transmitters 3a to 3n are operated, with the contents specified by the operation setting conditions,
By sampling a vibration signal obtained by the vibration sensor 7,
Generate vibration data and store it in FIFO format.
In this state, when a command is supplied through the coaxial cable 6, the operation setting condition is changed in accordance with the command, and the vibration measurement operation, the sampling operation, and the storage operation are performed under the changed operation setting condition. To continue. Then, when a transmission instruction signal is supplied via the coaxial cable 6, the stored vibration data is converted into a transmission signal of a designated carrier frequency and sent out onto the coaxial cable 6, and the center device is transmitted. 5 is transmitted.

The center device 5 receives a power supply in the monitoring room 4 as shown in FIG. 3, generates a power supply voltage, and transmits the power supply voltage via the coaxial cable 6 to each of the vibration measuring transmitters 3a.
-3n, and a power supply circuit 15 for supplying power to each circuit provided inside the center device 5;
A receiver circuit 16 for receiving and amplifying the transmission signal transmitted above and generating a reception signal;
6, the received signal having a preset carrier frequency (the carrier frequency of each of the vibration measuring transmitters 3a to 3n) is selectively FM-demodulated.
While generating vibration data and buffering this,
A plurality of frequency discriminating FM demodulation circuits 17a to 17n that output in a FIFO format and the vibration data output from each of the frequency discriminating FM demodulation circuits 17a to 17n are fetched, and the process of analyzing the vibration state is performed based on the analysis result A process of creating a vibration analysis screen in a preset display format, a process of generating a command or a transmission instruction signal based on the input operation content, a train passage detector 18 provided in front of or behind the bridge 2 , 19 (see FIG. 1), and a data processing circuit 20 for performing processing for changing the generation timing of the transmission instruction signal.

The center device 5 further includes a storage circuit 21 for storing vibration data and analysis data fetched by the data processing circuit 20, various switches for designating and switching operation contents, and the like. A man-machine that has a display for displaying a screen, supplies the contents operated by an operator to the data processing circuit 20, captures display data output from the data processing circuit 20, and displays the data on a screen; Based on a command and a transmission instruction signal output from the interface circuit 22 and the data processing circuit 20, a carrier of a preset frequency is FM-modulated as shown in FIG. A transmitter circuit 23 for transmitting the vibration measurement transmitters 3a to 3n via the coaxial cable 6; It is provided. A power supply voltage is generated, and each of the vibration measuring transmitters 3 is connected via a coaxial cable 6.
While supplying power to the a to 3n, the vibration measuring transmitters 3a to 3n are operated under the operation setting conditions specified by the operator to detect the vibration at each observation point. Vibration data collected by each of the vibration measurement transmitters 3a to 3n is converted into a transmission signal and transmitted, and at the same time, the transmission signal is received and the vibration data of each observation point is analyzed, and this is set in advance. Display on the screen in the display format shown.

Next, FIG. 1, FIG. 2, FIG.
Referring to the block diagram shown in FIG. 4 and the schematic diagram shown in FIG.
The operation of this embodiment will be described. First, a man-machine interface circuit 22 of the center device 5 is operated by an operator.
Is operated and a power-on instruction is input, the data processing circuit 20 detects this, the power supply circuit 15 is turned on, and supply to the entire center device 5 is started. Each vibration measurement transmitter 3a ~
Power is started to 3n and these are put into operation. Then, if the man-machine interface circuit 22 of the center device 5 is operated by the operator to change the operation setting conditions and the like, the data processing circuit 20 detects the change and generates a command corresponding to the change, This is converted into a transmission signal of a preset carrier frequency, transmitted over the coaxial cable 6, and the operation setting conditions stored in each of the vibration measurement transmitters 3a to 3n are changed.

Thus, each of the vibration measuring transmitters 3a to 3n
Detects the vibration at each observation point under the operation setting conditions specified in the current operation setting conditions, converts this to vibration data at the specified sampling period, that is, a long sampling period, and specifies it in FIFO format The stored numbers are sequentially stored. In parallel with this operation, the center device 5
5C, a transmission instruction signal is generated at a cycle corresponding to the operation setting condition as shown in FIG. 5C, and is converted into a transmission signal of a preset carrier frequency. And supplied to each of the vibration measurement transmitters 3a to 3n. As a result, the vibration measurement transmitters 3a to 3n convert the stored vibration data into transmission signals having different carrier frequencies, and transmit the transmission signals to the coaxial cable 6 and the center device 5. This is received by the receiver circuit 16, and the frequency discriminating FM demodulation circuits 17a to 17n
The frequency is discriminated by FM demodulation, FM demodulation is performed, and the vibration data obtained thereby is collected and analyzed by the data processing circuit 20, and the analysis result and the vibration data are stored in the storage circuit 2
1 is stored.

Thereafter, as shown in FIG. 5A, a train passage detector 18 provided in front of the bridge 2 provided with each of the vibration measuring transmitters 3a to 3n and the like allows a train passage 24 to be detected.
Is detected, the data processing circuit 20 of the center device 5
As a result, a command for shortening the sampling period of each of the vibration measuring transmitters 3a to 3n is generated as shown in FIG. The operation setting conditions transmitted on the cable 6 and stored in each of the vibration measurement transmitters 3a to 3n are changed. As a result, the sampling period of each of the vibration measurement transmitters 3a to 3n is shortened, and vibration data indicating the detailed vibration content of each observation point is generated. The vibration data is sequentially stored by the number specified in the FIFO format. The transmission instruction signal is generated by the data processing circuit 20 of the center device 5 at a short cycle as shown in FIG. 5C, and is converted into a transmission signal of a preset carrier frequency. It is transmitted and supplied to each of the vibration measurement transmitters 3a to 3n.

As a result, the vibration measurement transmitters 3a to 3n convert the stored vibration data indicating the detailed vibration contents into transmission signals having different carrier frequencies, and transmit the converted signals to the coaxial cable 6. At the same time, this is received by the receiver circuit 16 of the center device 5, frequency-discriminated by each of the frequency-discriminating FM demodulation circuits 17 a to 17 n, FM-demodulated, and the vibration data obtained thereby is collected by the data processing circuit 20. The analysis is performed, and the analysis result and the vibration data are stored in the storage circuit 21. When the passage of the train 24 is detected by a train passage detector 19 provided behind the bridge 2 as shown in FIG. 5B, this is detected by the data processing circuit 20 of the center device 5, and is shown in FIG. As shown in (e), a command for restoring the sampling period of each of the vibration measurement transmitters 3a to 3n is generated, this is converted into a transmission signal of a preset carrier frequency, transmitted to the coaxial cable 6, and transmitted. The operation setting conditions stored in the vibration measurement transmitters 3a to 3n are changed.

Thus, each of the vibration measuring transmitters 3a to 3n
Is returned to the original, and vibration data indicating the rough vibration content of each observation point is generated.
The data is sequentially stored by the number specified in the FO format, and is stored in the data processing circuit 20 of the center device 5 as shown in FIG.
As shown in (c), a transmission instruction signal is generated at a long cycle, converted into a transmission signal of a preset carrier frequency, sent out on the coaxial cable 6, and supplied to each of the vibration measuring transmitters 3a to 3n. Then, the collection of the vibration data is started under the operation setting conditions when the train 24 does not pass. The man-machine interface circuit 22 of the center device 5 is operated, and among the respective vibration data obtained by the respective vibration measurement transmitters 3a to 3n, the vibration content of one vibration measurement transmitter, for example, the vibration measurement transmitter 3a When an instruction to display the vibration content in the two-dimensional screen format is input, the data processing circuit 20 reads the vibration data and analysis data from the vibration measurement transmitter 3a stored in the storage circuit 21, and The display data in the two-dimensional screen format is created, and the two-dimensional vibration analysis screen 25 shown in FIG. 6 is displayed on the display of the man-machine interface circuit 22. At this time, the man-machine interface circuit 22 of the center device 5 is operated to input an instruction to display the content of each vibration data obtained by each of the vibration measurement transmitters 3a to 3n in a three-dimensional screen format. Then, each of the vibration measurement transmitters 3 a to 3 stored in the storage circuit 21 by the data processing circuit 20.
Then, the vibration data and analysis data from n are read, and the display data in the three-dimensional screen format is created. The three-dimensional vibration analysis screen 26 shown in FIG. Is displayed.

As described above, in this embodiment, a command is output from the center device 5 and each of the vibration measurement transmitters 3a is output.
To 3n, the vibration measurement transmitters 3a to 3n are set.
When the transmission instruction signal is output from the center device 5 while the vibration data obtained by the vibration measurement operation is accumulated and the vibration data obtained by the vibration measurement operation is accumulated, each of the vibration measurement transmitters 3a to 3n
n to output FM modulation signals having different carrier frequencies from each other, and these are taken in by the center device 5 and recorded and analyzed. Therefore, each of the vibration measurement transmitters 3a to 3n
And the center device 5 are connected by one coaxial cable 6, so that the trouble of installing the coaxial cable 6 can be omitted, and the total amount of the coaxial cable 6 can be shortened.
Even if the number of installed vibration measurement transmitters 3a to 3n is increased while reducing the installation cost, the vibration signals obtained by the vibration sensors of each of the vibration measurement transmitters 3a to 3n can be accurately transmitted to the center device 5. it can. At this time, during periods other than the period when the train 24 passes on the bridge 2, each of the vibration measurement transmitters 3a to 3
n to prevent unnecessary collection of vibration information, and to shorten the sampling period of each of the vibration measurement transmitters 3a to 3n only during the period when the train 24 passes over the bridge 2, to obtain details of the vibration information. Since detailed contents are collected and transmitted to the center device 5 for analysis, the detailed change of the vibration signal is zoomed in and observed only during a period in which the detailed contents of the vibration information are desired to be known. be able to.

Further, in this embodiment, the vibration is measured by each of the vibration measuring transmitters 3a to 3n arranged along the bridge 2 so that the vibration can be displayed on a three-dimensional vibration analysis screen 26. Therefore, when the train 24 passes over the bridge 2, it is possible to grasp at a glance how each observation point vibrates. Further, in the above-described embodiment, among the vibration measurement transmitters 3a to 3n, the carrier frequencies of the adjacent vibration measurement transmitters are shifted from each other by one. Is output, a transmission signal obtained by FM-modulating the carrier of each carrier frequency with the vibration data from each of the vibration measurement transmitters 3a to 3n is transmitted at the same time. Vibration measurement transmitters 3a to 3n
, The signal amount of the transmission signal transmitted from each of the vibration measurement transmitters 3a to 3n gradually changes, and the time required for transmission of the transmission signal transmitted from each of the vibration measurement transmitters 3a to 3n is slightly shifted.
Even if the carrier frequency specified for each of the vibration measurement transmitters 3a to 3n is set high, the transmission signals transmitted from each of the vibration measurement transmitters 3a to 3n can be efficiently classified.

In the above embodiment, the CPU circuit 9 provided for each of the vibration measuring transmitters 3a to 3n is provided.
The transmitter circuit 13 outputs a transmission signal by FM-modulating a carrier having a preset carrier frequency based on the vibration data based on the vibration data. The vibration data output from
After converting the signal into a vibration signal, the carrier having a preset carrier frequency is FM-modulated based on the vibration signal to generate a transmission signal. Alternatively, the frequency discrimination FM demodulation circuits 17a to 17n on the side of the center device 5 may perform band-pass filtering, perform FM demodulation, and A / D convert to reproduce vibration data. By doing in this way, as shown in the schematic diagrams of FIGS. 8A and 8B, the amplitude of the vibration signal obtained by each of the vibration measurement transmitters 3a to 3n changes with the passage of the train 24, Each of these vibration measurement transmitters 3a-3
n, the frequency band of the transmission signal output from each of the vibration measurement transmitters 3a to 3n is increased, even if the carrier frequency specified for each of the vibration measurement transmitters 3a to 3n is increased.
The transmission signal transmitted from n can be efficiently classified by frequency.

Further, in each of the above-described embodiments, an FM modulation signal is used as a transmission signal transmitted over the coaxial cable 6, but a transmission signal modulated by another modulation method, for example, a quadrature signal is used. A transmission signal modulated by the modulation scheme, a transmission signal modulated by the FSK modulation scheme, a transmission signal modulated by the MSK modulation scheme, a transmission signal modulated by the PSK modulation scheme, or the like may be used. In the above-described embodiment, each of the vibration measurement transmitters 3a to 3n
Of these, the carrier frequencies of adjacent vibration measurement transmitters are shifted from each other by one, so that the transmission signals transmitted from these vibration measurement transmitters 3a to 3n change in bandwidth over time. Also, the crosstalk is prevented from occurring, but when the number of installed vibration measurement transmitters 3a to 3n is small, the number of each vibration measurement transmitter 3a to 3n
The carrier frequency number may be matched. Even in this case, by widening the carrier frequency interval between the vibration measurement transmitters 3a to 3n, it is possible to prevent transmission signals transmitted from the vibration measurement transmitters 3a to 3n from crosstalk.

[0026]

According to the present invention, the observation point equipment provided for each observation point, the center apparatus provided on the monitoring room side, and both of them are combined into one. In the multi-point simultaneous measurement system connected by the transmission cable, the measurement sampling cycle and the like are changed as necessary from the center device to the observation point device, so that the sampling period in the observation point device can be freely changed. Since measurement can be performed, accurate data collection can be performed while reducing the number of transmission cable laying steps and costs. According to a second aspect, when the observation point device in the multi-point simultaneous measurement system according to the first aspect is a plurality of vibration measurement transmitters arranged along a path of a moving object, the vibration transmitters adjacent to each other are used. Since the carrier frequencies of the output modulated signals are frequency-arranged so as not to be adjacent to each other, crosstalk between transmission signals can be reduced even if the number of vibration transmitters is increased. Further, according to claim 3, when the observation point device is a plurality of vibration measurement transmitters arranged along the path of the moving body, since the moving body passage detection means is provided at both ends of the moving body path, If the sampling period is controlled to be short while the moving body passes through the moving body path, detailed data can be collected when the moving body passes through the moving body, so that efficient observation can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an example of an embodiment of a multipoint simultaneous measurement system according to the present invention.

FIG. 2 is a block diagram showing a detailed circuit configuration example of each vibration measurement transmitter shown in FIG.

FIG. 3 is a block diagram showing a detailed circuit configuration example of the center device shown in FIG. 1;

FIG. 4 is a schematic diagram showing an example of frequency characteristics of each transmission signal used in the multi-point simultaneous measurement system shown in FIG. 1;

FIG. 5 is a timing chart showing an example of transmission timing of a transmission instruction signal and the like used in the multi-point simultaneous measurement system shown in FIG. 1;

6 is a schematic diagram showing an example of a two-dimensional vibration analysis screen displayed by the man-machine interface circuit shown in FIG. 3;

7 is a schematic diagram showing an example of a three-dimensional vibration analysis screen displayed by the man-machine interface circuit shown in FIG.

FIG. 8 is a schematic diagram showing an example of a frequency characteristic of each transmission signal used in another example of the multipoint simultaneous measurement system according to the present invention.

FIG. 9 is a block diagram showing an example of a conventionally known multi-point simultaneous measurement system.

FIG. 10 is a block diagram showing another example of a conventionally known multi-point simultaneous measurement system.

[Explanation of symbols]

1 Simultaneous multi-point measurement system, 2 bridge, 3a to 3n vibration measurement transmitter (observation point equipment), 4 monitoring room, 5 center device, 6 coaxial cable (transmission cable), 7 vibration sensor, 8 A / D conversion circuit, 9 CPU circuit, 10 RO
M circuit, 11 RAM circuit, 12 receiver circuit, 13
Transmitter circuit, 14 Stabilized power supply circuit, 15 Power supply circuit, 16 Receiver circuit, 17a to 17n Frequency discrimination FM demodulation circuit, 18, 19 Train passage detector, 20
Data processing circuit, 21 storage circuit, 22 man-machine interface circuit, 23 transmitter circuit 24 train

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaru Abe 2-6 Nakase, Mihama-ku, Chiba City, Chiba Prefecture WBG Malibu West 25th floor BMC Co., Ltd. (56) References JP-A-7-55551 (JP, A JP-A-3-182198 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01H 17/00 G08C 15/04

Claims (3)

(57) [Claims] 1. An observation point device provided for each observation point,
In a multi-point simultaneous measurement system including a center device provided on a monitoring room side and one transmission cable connecting the center device and each of the observation point devices, the observation point device includes at least a measurement sampling cycle.
And the like to change
Transmission instruction signal to measurement equipment and measurement sample of observation point equipment
The transmission of the observation point device when the
Now, change to the sampling cycle corresponding to the instruction signal.
Measurement and the measurement data in a preset modulation method.
Modulated by the equation, multiplexed, and transmitted through the transmission cable.
Multi-point simultaneous measurement system characterized by transmitting data to 2. The method according to claim 1, wherein the observation point device is arranged along a path of the moving body.
With multiple vibration measurement transmitters
Carrier of each modulated signal output from the interfering vibration transmitter
Frequency arrangement so that the frequencies are not adjacent to each other
2. The multi-point simultaneous measurement system according to claim 1, wherein: 3. The observation point device according to claim 1, wherein
A plurality of vibration measurement transmitters arranged in
Moving object passage detecting means disposed at both ends, wherein the center device monitors an output of the moving object passage detecting means.
While the moving object passes through the moving object path,
Change the sampling period to the measuring instrument and transmit the measurement result
An instruction signal is transmitted as follows.
Is the multipoint simultaneous measurement system described in 2 .