CN103954344A - Acceleration sensor based dynamic weighing signal real-time compensation device and method - Google Patents

Abstract

The invention discloses a real-time compensation device and method for a dynamic weighing signal based on an acceleration sensor. The load cell is raised by gaskets and installed on the installation base. The weighing platform, sensor gasket and acceleration sensor mounting base are installed on the load end of the load cell through bolts. The acceleration sensor is installed on the acceleration sensor mounting base. The load cell The electrical signal output by the acceleration sensor is connected to the signal conditioning circuit for filtering and amplification, and finally input to the DSP signal processing module for signal processing after analog-to-digital conversion to realize real-time compensation of dynamic weighing signals. The invention utilizes the acceleration sensor to detect the vibration interference signal acting on the weighing sensor in real time and realizes the real-time compensation of the dynamic weighing signal through the signal fusion method, which can be adapted to various dynamic weighing applications, and is especially suitable for applications greatly affected by mechanical vibration Dynamic weighing occasions.

Description

Device and method for real-time compensation of dynamic weighing signal based on acceleration sensor

technical field

The invention relates to a compensation device and method for dynamic weighing, in particular to a real-time compensation device and method for dynamic weighing signals based on an acceleration sensor.

Background technique

Weighing is closely related to modern production and people's life, and is an important branch of measurement. With the development of electronic information technology and the continuous improvement of production efficiency in all walks of life, dynamic weighing has been widely used, especially in assembly line operations, such as food processing, medical production, production measurement, transportation, etc. Dynamic weighing can not only shorten working time, improve production efficiency, but also promote the modernization of production automation and management in various industries.

Usually, a load cell is used to convert the weight (force) into a tiny electrical signal, and then after filtering, amplification, and AD conversion, the signal is processed by various digital processors and the actual mass is calculated. The main feature of dynamic weighing is to measure the weight of the measured object in a short period of time when the measured object or the measurement environment is in motion. Due to the above characteristics of dynamic weighing, the signal output by the sensor contains many interference signals, especially the vibration interference caused by the mechanical part of the dynamic weighing system and the electromagnetic radiation interference caused by the electrical part. In addition, the type of object to be weighed (mass, volume, motion state, etc.) and weighing speed will have a greater impact on the weighing signal. In addition to interfering signals, high-speed dynamic weighing is limited by the inherent response time of the weighing system. To sum up, the characteristics of the dynamic weighing signal are: (1) The signal contains a strong low-frequency vibration signal, and the frequency spectrum of the useful signal and the interference signal overlap; (2) The frequency spectrum of the interference signal is time-varying. (3) The signal response time is long. The theoretical dynamic weighing signal is a short-term step signal, and its energy is mainly in the low frequency band. High-frequency interference can be filtered out by an analog or digital low-pass filter, but strong low-frequency interference with overlapping and time-varying spectrum cannot be filtered out by a low-pass filter.

The dynamic weighing system mainly includes two parts: mechanical body and weighing signal acquisition and processing. The Chinese patent (application number: 200720034920.0) applied by Hao Zhiwei and Jiang Lian describes a double-bar automatic checkweigher. The Chinese patent (application number: 00230980.7) applied by Zhang Ji'an describes an automatic detection weighing scale. The Chinese patent (application number: 201020184124.7) applied by Lu Kuirong, Zhao Guanghua, Wu Zhengxiang and others describes a new type of fruit weighing device. The above patents all describe the mechanical bodies of dynamic weighing in different fields. However, there are not many researches on dynamic weighing signal processing methods in China. In the application of dynamic weighing of automobiles, the Chinese patent (application number: 200810097806.1) applied by Li Lihong, Zhang Jianyong and others describes a dynamic weighing method based on speed compensation. In terms of fruit dynamic weighing, for a specific fruit weighing device, the Chinese patent (application number: 201010228673.4) applied by Cai Wen, Hou Dibo and others describes a fruit weighing and grading system and weighing method using DSP processing modules and intelligent methods . The fruit weighing intelligent method in the above-mentioned patent adopts the filter cancellation method, which inputs the data passing through the weighing section when the fruit cup is empty at different speeds as the reference noise input. This offline reference noise does not include the actual dynamic weighing. Various random vibration disturbances caused by the motion of the object itself. The methods of the above two patents are only aimed at specific applications, and the applications are limited.

Contents of the invention

In view of the defects of the prior art, the object of the present invention is to provide a real-time compensation device and method for dynamic weighing signals based on acceleration sensors, which can detect in real time the vibration interference signals acting on the load cells and the vibration interference signals including the vibration interference signals The weighing signal, and then through the real-time signal fusion method, real-time compensation for the dynamic weighing signal to improve the weighing accuracy.

In order to achieve the above object, the technical scheme adopted in the present invention is:

1. A real-time compensation device for dynamic weighing signals based on acceleration sensors

Including load cell mounting base, gasket, load cell, acceleration sensor mounting base, weighing platform, acceleration sensor, signal conditioning circuit and DSP signal processing module; the load cell is installed on the load cell mounting base through the first bolt, There is a gasket between the load cell and the load cell mounting base; the load end of the load cell and the acceleration sensor mounting base are fixedly connected to the bottom surface of the weighing platform through the second bolt, and the force surface of the load end of the load cell is in contact with the scale platform. The bottom surface is parallel, the acceleration sensor is installed on the side of the load end of the load cell through the acceleration sensor mount, and the sensing axis of the acceleration sensor is perpendicular to the force surface of the load end of the load cell;

The acceleration sensor and the load cell are respectively connected to the DSP signal processing module through the signal conditioning circuit, and the DSP signal processing module is connected to the host computer. The signal Vw output by the load cell and the signal Va output by the acceleration sensor are input to the DSP signal processing module after signal conditioning .

The signal conditioning circuit includes a pre-filter amplifying circuit for filtering and amplifying the load cell signal, a secondary adjustable amplifying circuit for adjusting and amplifying the load cell signal after filtering and amplifying the signal, and a secondary adjustable amplifying circuit for adjusting the acceleration The sensor signal is filtered and amplified by a filter amplifier circuit.

The DSP signal processing module includes an analog-to-digital converter and an embedded DSP digital signal processor. The two-way analog signals output by the signal conditioning circuit are digital signals obtained after the analog-to-digital conversion by the analog-to-digital converter, and the serial external The interface SPI is set to input into the embedded DSP digital signal processor, and the embedded DSP digital signal processor is connected with the upper computer through the serial communication interface SCI.

The acceleration sensor mounting base is L-shaped, and the L-shaped horizontal side of the acceleration sensor mounting base is installed between the load end of the load cell and the bottom surface of the weighing platform, and the L-shaped vertical side of the acceleration sensor mounting base is fixedly installed with an acceleration sensor. .

The acceleration sensor mounting seat is strip-shaped, and one side of the acceleration sensor mounting seat is installed between the load end of the load cell and the bottom surface of the weighing platform, and the other side of the acceleration sensor mounting seat is fixedly installed with Accelerometer.

The acceleration sensor mounting seat is bar-shaped, one side of the bar-shaped acceleration sensor mounting seat is installed on the bottom surface of the load end of the load cell, and the other side of the bar-shaped acceleration sensor mounting seat is fixedly installed with an acceleration sensor.

The mounting seat of the acceleration sensor is in close contact with the load end of the load cell.

A sensor pad is provided between the acceleration sensor mounting seat and the bottom surface of the weighing platform.

A sensor gasket is arranged between the load end of the weighing sensor and the bottom surface of the weighing platform.

Two, a kind of dynamic weighing signal real-time compensation method based on acceleration sensor, comprises the following steps:

A) The dynamic weighing device is installed on the weighing platform, and the object to be weighed is placed on the dynamic weighing device, and the force signal F including the vibration disturbance N(t) of the weighing platform and the weight G of the object to be weighed passes through the dynamic weighing device and The weighing platform acts on the load cell;

B) The load cell linearly converts the force signal F acting on its load end into an electrical signal Vw, which is filtered and amplified by the signal conditioning circuit and then input to the DSP signal processing module through AD conversion;

C) The acceleration sensor linearly converts the vibration signal N(t) acting on the load end of the load cell into an electrical signal Va, which is filtered and amplified by the signal conditioning circuit and then input to the DSP signal processing module through AD conversion;

D) The two signals input to the DSP signal processing module are processed in real time, and the force signal F acting on the load cell is compensated in real time through the adaptive interference cancellation filtering method or spectral subtraction, and the vibration interference is filtered out N(t), to achieve dynamic weighing.

The beneficial effects that the present invention has are:

1. The essence of the load cell is to measure the magnitude of the force acting on its load end. In dynamic weighing, various vibration disturbances act on the load cell, thus introducing a time-varying vibration interference signal into the output signal of the load cell. , the present invention uses the acceleration sensor to directly measure the interference signal acting on the load cell, and obtains various time domain and frequency domain parameters of the vibration interference signal in real time, so that different noise reduction and filtering methods can be studied on the basis of identifying the interference signal. Methods, such as the adaptive interference cancellation filter method, can also study other different multi-sensor signal fusion methods, and improve the response speed of the dynamic weighing signal while reducing noise. The present invention overcomes the low-pass filter used for dynamic weighing The lower the cut-off frequency of the filter, the longer the response time, the frequency overlap of the useful signal and the low-frequency interference signal causes the distortion of the filtered signal, and the time-varying characteristic of the vibration interference signal varies with different working conditions causes vibration interference. Real-time identification is difficult, which leads to the difficulty of research on dynamic weighing signal compensation methods.

2. The present invention provides a dynamic weighing signal compensation method that can be used in different applications in the dynamic weighing field, that is, the acceleration sensor is used to obtain the vibration interference signal in real time, which is suitable for different working conditions, and does not need to do a lot of experiments to obtain the interference signal and The relationship between different working conditions (such as weighing speed and objects to be weighed) realizes real-time adaptive compensation of dynamic weighing signals, and also reduces the complexity of equipment operation and maintenance.

3. The present invention only needs to install an acceleration sensor on the basis of the original dynamic weighing device, which is easy to install and facilitates the improvement of the original dynamic weighing system.

4. The present invention provides a new method that can be used in other dynamic measurement fields, that is, for the interference signals in different dynamic measurements, use suitable sensors to directly measure the interference source, so as to study the compensation method under the premise of effectively identifying the interference signal. Realize real-time compensation for dynamic measurement signals and improve the accuracy of dynamic measurement.

Description of drawings

Fig. 1 is a structural schematic diagram of the device of the present invention.

Fig. 2 is a schematic block diagram of the circuit connection of the present invention.

Fig. 3 is a schematic diagram of the first installation mode of the acceleration sensor.

Fig. 4 is a schematic diagram of a second installation mode of the acceleration sensor.

Fig. 5 is a schematic diagram of a third installation mode of the acceleration sensor.

Fig. 6 is a circuit diagram of the pre-filter amplifier circuit in the signal conditioning circuit.

Fig. 7 is a circuit diagram of the two-stage adjustable amplifier circuit in the signal conditioning circuit.

Fig. 8 is a circuit diagram of the filter amplifier circuit in the signal conditioning circuit.

Fig. 9 is a schematic diagram of the processing steps of the method of the present invention.

Fig. 10 is a schematic structural diagram of a belt-driven checkweigher according to an embodiment of the present invention.

FIG. 11 is a schematic diagram of an adaptive interference cancellation filtering method adopted in an embodiment of the present invention.

In the figure: 1. Load cell mounting base, 2. Gasket, 3. First bolt, 4. Load cell, 5. Acceleration sensor mounting seat, 6. Scale platform, 7. Second bolt, 8. Third Bolt, 9, acceleration sensor, 10, signal conditioning circuit, 11, DSP signal processing module, 12, sensor gasket.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, the device of the present invention includes a load cell mounting base 1, a gasket 2, a load cell 4, an acceleration sensor mounting base 5, a weighing platform 6, an acceleration sensor 9, a signal conditioning circuit 10 and a DSP signal processing module 11 .

As shown in Figure 1, the load cell 4 is installed on the load cell mounting base 1 through the first bolt 3, a gasket 2 is provided between the load cell 4 and the load cell mounting base 1, and the load cell 4 passes through the pad The sheet 2 is raised; the load end of the load cell 4 and the acceleration sensor mounting base 13 are fixedly connected to the bottom surface of the weighing platform 6 through the second bolt 7, and the force-bearing surface of the load end of the load cell 4 is parallel to the bottom surface of the scale platform 6, which is called The object is installed on the weighing platform 6 through a dynamic weighing device, and the acceleration sensor 9 is installed on the side of the load end of the load cell 4 through the acceleration sensor mounting base 13. The sensing axis of the acceleration sensor 9 is perpendicular to the load end of the load cell 4. On the force surface, the acceleration sensor 9 is installed on the acceleration sensor mounting base 13 through the third bolt 8 .

As shown in Figure 2, the acceleration sensor 9 and the load cell 4 are respectively connected to the DSP signal processing module 11 through the signal conditioning circuit 10, and the DSP signal processing module 11 is connected to the upper computer, and the signal Vw output by the load cell 4 and the acceleration sensor 9 The output signal Va is input to the DSP signal processing module 11 after signal conditioning.

The signal conditioning circuit 10 includes a pre-filter amplifying circuit for filtering and amplifying the signal of the load cell 4, a secondary adjustable amplifying circuit for performing adjustable amplification after filtering and amplifying the signal of the load cell 4, and a user It is used for filtering and amplifying the acceleration sensor 9 signal.

The DSP signal processing module 11 includes an analog-to-digital converter and an embedded DSP digital signal processor, and the two-way analog signals output by the signal conditioning circuit 10 are digital signals obtained after the analog-to-digital conversion by the analog-to-digital converter, and are obtained by the serial The line peripheral interface SPI is input into the embedded DSP digital signal processor, and the embedded DSP digital signal processor is connected with the upper computer through the serial communication interface SCI.

Preferably, as shown in Figure 3, it is the first installation method of the acceleration sensor 9, the acceleration sensor mounting base 13 is L-shaped, and the horizontal side of the acceleration sensor mounting base 13 L-shaped is installed on the load end of the load cell 4 and the weighing platform 6 Between the bottom surfaces, an acceleration sensor 9 is fixedly installed on the L-shaped vertical side of the acceleration sensor mounting base 13 , and a sensor gasket 12 is provided between the acceleration sensor mounting base 13 and the bottom surface of the weighing platform 6 .

Preferably, as shown in Figure 4, it is the second installation method of the acceleration sensor 9, the acceleration sensor mounting base 13 is in the shape of a bar, and one side of the acceleration sensor mounting base 13 in the bar shape is installed on the load end of the load cell 4 and the scale Between the bottom surfaces of the platform 6 , an acceleration sensor 9 is fixedly installed on the other side of the strip-shaped acceleration sensor mounting base 13 , and a sensor gasket 12 is arranged between the acceleration sensor mounting base 13 and the bottom surface of the weighing platform 6 .

Preferably, as shown in Figure 5, it is the third installation method of the acceleration sensor 9, the acceleration sensor mounting base 13 is in the shape of a bar, and one side of the acceleration sensor mounting base 13 in the bar shape is installed on the load end bottom surface of the load cell 4, An acceleration sensor 9 is fixedly installed on the other side of the bar of the acceleration sensor mounting base 13 , and a sensor pad 12 is arranged between the load end of the load cell 4 and the bottom surface of the weighing platform 6 .

In the above specific implementation, the acceleration sensor mounting base 13 is in close contact with the load end of the load cell 4 .

As shown in Figure 9, the method of the present invention includes the following steps (the method of the present invention is based on the above-mentioned compensation device):

A) The dynamic weighing device is installed on the weighing platform 6, and the object to be weighed is placed on the dynamic weighing device, including the vibration disturbance N(t) of the weighing platform 6 and the force signal F of the weight G of the object to be weighed through dynamic weighing The device and the weighing platform 6 act on the load cell 4, F=G+N(t), and t is time;

B) The load cell 4 linearly converts the force signal F acting on its load end into an electrical signal Vw, which is filtered and amplified by the signal conditioning circuit 10 and then input to the DSP signal processing module 11 through AD conversion;

C) The acceleration sensor 9 linearly converts the vibration signal N(t) acting on the load end of the load cell 4 into an electrical signal Va, which is filtered and amplified by the signal conditioning circuit 10 and then input to the DSP signal processing module 11 through AD conversion;

D) The two signals input to the DSP signal processing module 11 are processed in real time, and the force signal F acting on the load cell 4 is compensated in real time through the adaptive interference cancellation filtering method, and the filtered vibration interference N (t) Realize dynamic weighing, which plays the role of noise reduction and filtering, and obtains the estimated weight of the weighed object through processing, so as to realize real-time compensation of dynamic weighing signals and improve dynamic weighing accuracy.

The final estimated weight of the object to be weighed can be uploaded to the host computer for information integration.

The above adaptive interference cancellation filtering method can also be replaced by other multi-sensor signal fusion methods to minimize the vibration interference N(t) in the force signal (F=G+N(t)) acting on the load cell 4 .

Fig. 2 shows the functional block diagram of the acquisition and processing system of dynamic weighing signal of the present invention, comprises signal conditioning circuit 10 and DSP signal processing module 11; Signal conditioning circuit 10 comprises the pre-filter amplification for load cell 4 signal conditioning circuit and a secondary adjustable amplifier circuit, and a filter amplifier circuit for signal conditioning of the acceleration sensor 9, the signal Vw output from the load cell 4 and the signal Va output from the acceleration sensor 9 are input to the DSP signal processing module 11 after signal conditioning. The DSP signal processing module includes an analog-to-digital converter and an embedded DSP digital signal processor. The two analog signals output by the signal conditioning circuit 10 are converted into digital signals by the analog-to-digital converter, and then input to the DSP through the serial peripheral interface SPI, and the DSP is connected to the host computer through the serial communication interface SCI.

As shown in Fig. 6, the described pre-filter amplifying circuit for signal conditioning of load cell 4 includes capacitors C1, C2, C3, C4, choke coils L1 and anti-common-mode noise with the same number of coils. The pre-filter circuit composed of L2, resistors R2 and R5, the instrument amplifier U1 and the pre-amplifier circuit composed of peripheral resistors and capacitors, the input signals W_Signal- and W_Signal+ of the load cell 4 are used as the input signals of the pre-filter amplifier circuit, and the output signal is Out1 and Out2 are the output signals of the instrumentation amplifier U2.

The working principle of the pre-filter amplifier circuit is: the capacitors C1 and C2 connected in parallel in the circuit suppress the differential mode noise in the input signal of the load cell 4, and the two choke coils L1 and L2 with the same number of coils and the capacitors C1 and C4 suppress Load cell 4 input signal common mode noise, capacitors C1, C2, C3, C4 are ceramic capacitors or polyester capacitors with good high frequency characteristics; instrument amplifier U1 and the preamplifier circuit composed of peripheral resistors and capacitors, instrument amplifier U1 has Ultra-high input impedance, low input offset, low input impedance, and high common-mode rejection ratio, further suppressing common-mode signals, instrumentation amplifier U1 can use precision instrumentation amplifier INA114.

As shown in Figure 7, the two-stage adjustable amplifying circuit includes a first-stage amplifying circuit composed of an amplifier U2A, resistors R10, and R3, and the magnification of the amplifier U2B, sliding rheostats R6 and R7, and resistors R8 and R9 can be adjusted. Adjustable secondary amplifier circuit, clamping circuit composed of diodes D1, D2, resistor R18, and capacitor C10, the input signal of the secondary adjustable amplifier circuit is the output signal Out1 and Out2 of the pre-filter amplifier circuit, and the output signal is The output signal ADIN0 of the clamping circuit.

The working principle of the two-stage adjustable amplifying circuit is: the first-stage amplifying circuit composed of the amplifier U2A, resistors R10, and R3 with a fixed magnification, and the amplifier U2B, the sliding rheostats R6 and R7, and the magnification of the resistors R8 and R9 are adjustable. In the secondary amplifier circuit, the resistance value of R6 is selected to be much larger than the resistance value of R7, the coarse adjustment of the amplification factor of the secondary amplification circuit is realized through the sliding rheostat R6, and the fine adjustment of the amplification factor of the secondary amplification circuit is realized through the sliding rheostat R7 ; Amplifier U2A and amplifier U2B can use 2-channel micro-power precision operational amplifier OPA2241, and the clamping circuit ensures that the output signal ADIN0 is clamped at 0-5V.

As shown in Figure 8, the described filter amplifier circuit for the acceleration sensor 9 includes capacitors C11, C12, C13, C14, choke coils L3 and L4 for anti-common mode noise with the same number of coils, resistor R20, The filter circuit composed of R22, the amplifier circuit composed of instrument amplifier U3 and peripheral resistors and capacitors, the clamping circuit composed of diodes D3, D4, resistor R21, and capacitor C15, the input signal of the filter amplifier circuit is the differential signal A_Signal output by the acceleration sensor - and A_Signal+, the output signal of the filter amplifier circuit is the output signal ADIN1 of the clamp circuit.

The working principle of the filter amplifier circuit is as follows: the capacitors C12 and C13 connected in parallel in the circuit suppress the differential mode noise in the input signal of the acceleration sensor 9 . Two choke coils L3 and L4 with the same number of coils and capacitors C11 and C14 suppress the common mode noise of the input signal of the acceleration sensor 9 . Capacitors C11, C12, C13, and C14 all use ceramic capacitors or polyester capacitors with good high-frequency characteristics, and the clamping circuit ensures that the output signal ADIN1 is clamped at 0-5V.

The circuit involved in the present invention needs a 24V regulated DC power supply for power supply. The circuit needs 4 sets of independent DC power supplies, which are +8V, -8V, +5V and 3.3V respectively. , TPS767D301) to build a circuit, the load cell in the above circuit can be a resistance strain load cell, the above acceleration sensor can be a MEMS acceleration sensor 3741B122G, and the above embedded DSP digital signal processor can use TMS320F28335.

Specific embodiments of the present invention are as follows:

The present invention takes a belt-driven checkweigher as an implementation example, and the method for real-time compensation of dynamic weighing signals based on acceleration sensors realized by other dynamic weighing devices can refer to the method of this embodiment.

As shown in Figure 10, the belt-driven checkweigher is driven by a motor, and the roller is driven by a synchronous belt transmission, and the roller drives the belt to realize the transportation of the object to be weighed. The entire belt-driven checkweigher is installed on the weighing platform 6 . The object to be weighed enters the belt-driven checkweigher from the left end, and the signal output by the load cell 4 includes the weight of the object to be weighed and the weight of the entire belt-driven checkweigher; The conveying direction passes through the belt-driven checkweigher. Because the motor, synchronous belt drive assembly, and roller drive assembly will generate large mechanical vibrations during operation, and the above-mentioned mechanical vibration characteristics will change with the transmission speed and the quality of the object being weighed. In addition, the object to be weighed Random shaking during conveying can also generate unpredictable mechanical vibrations. Therefore, the actual output signal of the load cell 4 includes all the vibration signals acting on the load end of the load cell 4 and the weight signal of the object to be weighed. Due to the time-varying characteristics of vibration signals, frequency-domain selective filters with fixed parameters cannot effectively filter out vibration interference signals. The present invention uses the acceleration sensor 9 to linearly convert the mechanical vibration acting on the load end of the load cell 4 into an electrical signal, which is used to compensate the output signal of the load cell 4 including the mechanical vibration signal and the weight signal of the object to be weighed.

Theoretically, the weight G of the object to be weighed is a constant, and the mechanical vibration signal is a time-varying signal. The vibration interference signal acting on the load end of the load cell is recorded as N(t), and the resistance strain type load cell 4 will act on its load The force signal F(F=G+N(t)) at the end is linearly converted into an electrical signal Vw, filtered and amplified by the signal conditioning circuit 10, then input to the DSP signal processing module 11, converted into a digital signal by the analog-to-digital converter, and then input into the embedded DSP signal processor TMS320F28335, recorded as sequence f(n), and f(n)=g(n)+n(n), where sequence g(n) is a time series containing the weight G of the object to be weighed, sequence n (n) is a time series including the vibration interference signal N(t); the MEMS acceleration sensor 9 linearly converts the vibration signal N(t) acting on the load end of the resistance strain type load cell 4 into an electrical signal Va, which is filtered by the signal conditioning circuit , input DSP signal processing module 11 after amplifying, input embedded DSP signal processor TMS320F28335 after the analog-to-digital converter is converted into a digital signal, denoted as a (n); Above-mentioned signal g (n) is a direct current signal, and resistance strain The signal n(n) caused by the vibration disturbance measured by the formula load cell 4 and the signal a(n) caused by the vibration disturbance measured by the MEMS acceleration sensor 9 are not correlated, and n(n) and a(n) Both are caused by vibration interference signals and have a high correlation. The adaptive interference cancellation filter uses the signal g(n)+n(n) as the original input and a(n) as the reference input. The adaptive filter uses the LMS method to minimize the mean square error of the system output. The filter The output y(n) of the system is the optimal mean square estimate of n(n), and the system output e(n) is the optimal least mean square estimate of g(n), so as to realize real-time compensation of dynamic weighing signals and filter out vibration Interference signal, improve dynamic weighing accuracy.

The above specific embodiments are used to explain the present invention, rather than to limit the present invention. Within the spirit of the present invention and the protection scope of the claims, any modification and change made to the present invention will fall into the protection scope of the present invention.

Claims (10)

1. A real-time compensation device for dynamic weighing signals based on an acceleration sensor, characterized in that it includes a load cell mounting base (1), a gasket (2), a load cell (4), and an acceleration sensor mounting base (5) , weighing platform (6), acceleration sensor (9), signal conditioning circuit (10) and DSP signal processing module (11); The load cell (4) is installed on the load cell mounting base (1) through the first bolt (3), and a gasket (2) is provided between the load cell (4) and the load cell mounting base (1); The load end of the load cell (4) and the mounting base of the acceleration sensor (13) are fixedly connected to the bottom surface of the weighing platform (6) through the second bolt (7), and the force surface of the load end of the load cell (4) is in contact with the weighing platform ( 6) The bottom surface is parallel, the acceleration sensor (9) is installed on the side of the load end of the load cell (4) through the acceleration sensor mount (13), and the sensing axis of the acceleration sensor (9) is perpendicular to the load of the load cell (4) End force surface; The acceleration sensor (9) and the load cell (4) are respectively connected to the DSP signal processing module (11) through the signal conditioning circuit (10), and the DSP signal processing module (11) is connected to the host computer, and the output of the load cell (4) The signal Vw and the signal Va output by the acceleration sensor (9) are input to the DSP signal processing module (11) after signal conditioning. 2. A real-time compensation device for dynamic weighing signals based on an acceleration sensor according to claim 1, characterized in that: the signal conditioning circuit (10) includes a filter for amplifying the signal of the load cell (4) A pre-filter amplifier circuit, a secondary adjustable amplifier circuit for filtering and amplifying the signal of the load cell (4) before performing adjustable amplification, and a filter amplifier circuit for filtering and amplifying the signal of the acceleration sensor (9). 3. A real-time compensation device for dynamic weighing signals based on an acceleration sensor according to claim 1, characterized in that: the DSP signal processing module (11) includes an analog-to-digital converter and an embedded DSP digital signal processor , the two-way analog signals output by the signal conditioning circuit (10) are digital signals obtained after analog-to-digital conversion by the analog-to-digital converter, and are input into the embedded DSP digital signal processor by the serial peripheral interface SPI, and the embedded DSP digital signal The signal processor is connected with the host computer through the serial communication interface SCI. 4. A real-time compensation device for dynamic weighing signals based on an acceleration sensor according to claim 1, characterized in that: the acceleration sensor mounting seat (13) is L-shaped, and the acceleration sensor mounting seat (13) is L-shaped The horizontal side of the horizontal side is installed between the load end of the load cell (4) and the bottom surface of the weighing platform (6), and the vertical side of the L-shaped acceleration sensor mounting base (13) is fixedly equipped with an acceleration sensor (9). 5. A real-time compensation device for dynamic weighing signals based on an acceleration sensor according to claim 1, characterized in that: the acceleration sensor mounting seat (13) is strip-shaped, and the acceleration sensor mounting seat (13) is strip-shaped One side of the bar is installed between the load end of the load cell (4) and the bottom surface of the weighing platform (6), and the other side of the bar of the acceleration sensor mounting seat (13) is fixedly equipped with an acceleration sensor (9). 6. A real-time compensation device for dynamic weighing signals based on an acceleration sensor according to claim 1, characterized in that: the acceleration sensor mounting seat (13) is strip-shaped, and the acceleration sensor mounting seat (13) is strip-shaped One side of the bar is installed on the bottom surface of the load cell (4), and the other side of the bar of the acceleration sensor mounting seat (13) is fixedly installed with an acceleration sensor (9). 7. A real-time compensation device for dynamic weighing signals based on acceleration sensors according to any one of claims 1 or 4 to 6, characterized in that: the acceleration sensor mount (13) and the load cell (4) tight fit between the load terminals. 8. A real-time compensation device for dynamic weighing signals based on an acceleration sensor according to any one of claims 4 or 5, characterized in that: between the acceleration sensor mounting base (13) and the bottom surface of the weighing platform (6) A sensor spacer (12) is provided. 9. A real-time compensation device for dynamic weighing signals based on an acceleration sensor according to claim 6, characterized in that: between the load end of the weighing sensor (4) and the bottom surface of the weighing platform (6) is a Sensor spacer (12). 10. A kind of dynamic weighing signal real-time compensation method based on acceleration sensor for the device described in claim 1, it is characterized in that comprising the following steps: A) The dynamic weighing device is installed on the weighing platform (6), and the object to be weighed is placed on the dynamic weighing device, including the vibration disturbance N(t) of the weighing platform (6) and the force signal F of the weight G of the object to be weighed Act on the load cell (4) through the dynamic weighing device and the weighing platform (6); B) The load cell (4) linearly converts the force signal F acting on its load end into an electrical signal Vw, which is filtered and amplified by the signal conditioning circuit (10), and then input to the DSP signal processing module (11) through AD conversion; C) The acceleration sensor (9) linearly converts the vibration signal N(t) acting on the load end of the load cell (4) into an electrical signal Va, which is filtered and amplified by the signal conditioning circuit (10) and then input to the DSP signal through AD conversion processing module (11); D) Process the two signals input to the DSP signal processing module (11) in real time, and perform real-time compensation on the force signal F acting on the load cell (4) through an adaptive interference cancellation filtering method or spectral subtraction , the filtered vibration disturbance N(t), realizes dynamic weighing.