CN115594044B - A method for measuring elevator balance coefficient with improved inspection accuracy - Google Patents
A method for measuring elevator balance coefficient with improved inspection accuracy Download PDFInfo
- Publication number
- CN115594044B CN115594044B CN202211120800.8A CN202211120800A CN115594044B CN 115594044 B CN115594044 B CN 115594044B CN 202211120800 A CN202211120800 A CN 202211120800A CN 115594044 B CN115594044 B CN 115594044B
- Authority
- CN
- China
- Prior art keywords
- current
- elevator
- frequency
- balance coefficient
- amplitude
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 58
- 238000007689 inspection Methods 0.000 title claims abstract description 18
- 238000005070 sampling Methods 0.000 claims abstract description 33
- 238000012545 processing Methods 0.000 claims abstract description 16
- 238000000605 extraction Methods 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 8
- 238000007405 data analysis Methods 0.000 claims description 5
- 230000009466 transformation Effects 0.000 claims description 5
- 238000012937 correction Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 7
- 238000004458 analytical method Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000011068 loading method Methods 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012952 Resampling Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
Abstract
A measuring method for elevator balance coefficient to increase inspection accuracy includes carrying out signal extraction from elevator inspection site to determine bandwidth, frequency, distortion rate and sensing characteristic current signal characteristics of signal, carrying out current signal processing to make up and down whole course operation of elevator car with no-load and rated load capacity of 25%, 40%, 50%, 75%, 100% and 110% respectively, measuring current value of motor when elevator car and counterweight are operated to same horizontal position, carrying out current signal processing to original sampled data of measured current value including one or more of sliding average algorithm, quasi-synchronous sampling method or amplitude phase frequency dynamic compensation method, recording current value after current signal processing, drawing current-load curve, and load rate corresponding to intersection point of up and down operation curve is balance coefficient of elevator. The invention can accurately measure the current and improve the balance coefficient test accuracy.
Description
Technical Field
The invention belongs to the technical field of measuring methods, and particularly relates to a measuring method for an elevator balance coefficient, which improves inspection accuracy.
Background
With the increasing number of high-rise buildings, the application requirements of traction elevators are expanding. The requirements of people on riding comfort and safety performance of the elevator are also continuously improved. Wherein the elevator balance factor is an important performance index of the elevator, related to the economy, comfort and safety of elevator operation. The balance coefficient is bigger or smaller, which brings a certain potential safety hazard and is easy to cause the car to punch the top or squat. In addition, the improper design of the balance coefficient can cause the change of the tension of the steel wire ropes at the two sides of the traction sheave, accelerate the abrasion between the traction sheave and the steel wire ropes, influence the accurate action of the speed limiter-safety tongs, and aggravate the burden of an electric drive control system and the like. Therefore, the balance coefficient items need to be checked during elevator installation, modification, and major maintenance. The method for measuring the current involved in the elevator balance coefficient test mainly comprises a loading current method, an idle power method and a frequency converter method. The current loading method is widely used because of the simple method for measuring the balance coefficient.
The quick detection method for the balance coefficient of the T/CASEIT elevator is provided with the steps of respectively measuring the running currents of the elevator in the upper and lower running process when the load is 40% and 50% of rated load, solving the balance coefficient of the elevator based on the relation between the load and the current, and recording the current under the condition that the elevator car and the counterweight run to the same horizontal position. The elevator balance coefficient test method specified in TSG-T7001-2009 elevator supervision test and periodic test rule-traction and forced drive elevator is that the elevator cars with no-load and loading rated load capacity are respectively operated in the whole course up and down, when the elevator cars and the counterweight are operated to the same horizontal position, the current value of the motor is recorded, the current-load curve is drawn, and the load rate corresponding to the intersection point of the up-and-down operation curve is the balance coefficient of the elevator.
The measuring method is widely applied, but still has the following defects that (1) the judgment that the car and the counterweight are positioned at the same horizontal position is difficult, the requirement on operators is high, and the personnel reading error is large. (2) During the whole running stage of the elevator in the ascending or descending direction, the current is a fluctuating process, and a large random error exists for instantaneous fluctuating current sampling. (3) The waveforms of the current signals are greatly different between the front end and the rear end of the frequency converter. (4) The open clamp ammeter or clamp transformer is used as current collecting equipment, and the indexes of signal bandwidth, transformation ratio, phase shift and the like of the selected current measuring instrument directly determine the measuring accuracy.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for measuring the balance coefficient of the elevator, which improves the inspection accuracy, realizes accurate measurement of current and achieves the aim of improving the inspection accuracy of the balance coefficient.
The invention is realized in the following way:
The elevator balance coefficient measuring method for improving the inspection accuracy comprises the following steps:
step S1, accurately identifying current signal characteristics:
the method comprises the steps of performing signal extraction work from an elevator inspection site, collecting operation current of an elevator by using a broadband digitizer, a broadband fluxgate sensor or a broadband shunt, and determining bandwidth, frequency, distortion rate and sensing characteristic current signal characteristics of the signal;
step S2, current signal processing:
The method comprises the steps of respectively carrying out full-course operation up and down on a lift car with no load and 25%, 40%, 50%, 75%, 100% and 110% of rated load capacity, and measuring the current value of a motor when the lift car and a counterweight are operated to the same horizontal position;
the method comprises the steps of carrying out current signal processing on the original sampled data of the measured current value to ensure the accuracy of a data analysis process, wherein the current signal processing comprises one or more of a moving average algorithm, a quasi-synchronous sampling method or an amplitude/phase frequency dynamic compensation method;
And S3, recording the current value after the current signal processing, drawing a current-load curve, and obtaining the load rate corresponding to the intersection point of the uplink and downlink running curves as the balance coefficient of the elevator.
Further, the quasi-synchronous sampling method specifically refers to:
and (3) filtering the frequency characteristic of the original sampling data, taking the filtered signal as a synchronous signal, resampling the original sampling sequence to achieve full-period transformation, and further eliminating errors caused by asynchronous sampling.
Further, the sliding average algorithm specifically refers to:
the width of the queue for the moving average is formed by extending the time width of 5% left and right by taking the moment that the car and the counterweight are at the same horizontal position as the center, and the average value of the queue is calculated according to the formula (1):
Wherein:
-an arithmetic mean value, a, of N current sample values in the queue;
i j, namely the value of the jth current in the queue, A;
n-the number of current samples in the queue.
Further, the amplitude/phase frequency dynamic compensation method specifically refers to:
Under laboratory conditions, the amplitude index is subjected to sweep frequency measurement by using a standard signal source, the frequency response of the angle difference is analyzed by using a known angle difference or a shunt with a negligible angle difference as a comparison reference, and then a mathematical correction model of amplitude frequency and phase frequency is established according to the measurement result.
Further, between the step S1 and the step S2, the method further includes:
And performing model selection configuration on the current measuring instrument, namely simulating a plurality of typical electrical signals which are commonly used under the conditions of abstract complexity and dynamic change under laboratory conditions, checking bandwidth, amplitude and phase frequency characteristic indexes, and selecting the current measuring instrument with the error meeting the requirement.
The invention has the advantages that:
1. And the original sampling data is subjected to frequency characteristic filtering treatment by adopting a quasi-synchronous sampling method, the filtered signal is used as a synchronous signal, and the original sampling sequence is resampled to achieve full-period transformation, so that errors caused by asynchronous sampling are eliminated, and the accuracy of the data analysis process is ensured.
2. The current value is calculated by utilizing a moving average algorithm, so that the problems of large field reading error of workers and large random error of sampling instantaneous fluctuation current are solved, and the working efficiency and the measuring accuracy are greatly improved.
3. When the current is measured, the amplitude and the phase are dynamically compensated according to the frequency analysis result, so that the accuracy of measuring the current signal by the clamp ammeter or the clamp transformer is ensured.
4. The current signal characteristics of bandwidth, frequency, distortion rate and sensing characteristics are identified, and typical electrical signals which are commonly used under abstract complex and dynamic change working conditions are simulated under laboratory conditions to perform type selection configuration of a current measuring instrument, so that the problems of large current waveform difference between the front end and the rear end of a frequency converter and the like caused by introducing a variable-current frequency conversion module are solved, the current signal characteristics are more suitable for the actual running condition of an elevator, and the current measuring instrument is high in pertinence, practicability and accuracy.
Drawings
The invention will be further described with reference to the accompanying drawings, in conjunction with examples.
FIG. 1 is a schematic flow chart of the method of the present invention.
Fig. 2 is a three-phase current waveform at the power supply end of an elevator according to an embodiment of the invention.
Fig. 3 is a phase a current spectrum in fig. 2.
Fig. 4 is a schematic diagram of a current signal feature recognition method according to the present invention.
FIG. 5 is a diagram illustrating queue time width selection in the moving average algorithm of the present invention.
Fig. 6 is a schematic diagram of a moving average calculation in the moving average algorithm of the present invention.
Fig. 7 is a diagram of a resampling synchronization signal in the quasi-synchronous sampling method of the present invention.
Fig. 8 is a graph showing amplitude frequency characteristics in the amplitude/phase frequency dynamic compensation method of the present invention.
Fig. 9 is a graph showing phase frequency characteristics in the amplitude/phase frequency dynamic compensation method of the present invention.
Fig. 10 is a schematic of a phase trigger signal simulated under laboratory conditions in accordance with the present invention.
Fig. 11 is a schematic representation of a square wave signal simulated under laboratory conditions according to the present invention.
Fig. 12 is a schematic representation of a half-wave rectified signal simulated under laboratory conditions according to the present invention.
Fig. 13 is a graph of amplitude error obtained for a clamp ammeter and a clamp transformer of the present invention using a composite of analog signals to develop performance signals.
Fig. 14 is a graph of phase error resulting from the present invention using a composite of analog signals to develop performance signals for a clamp ammeter and a clamp transformer.
Detailed Description
As shown in fig. 1, an elevator balance coefficient measuring method for improving inspection accuracy includes the steps of:
step S1, accurately identifying the current signal characteristics, as shown in FIG. 4:
The basis of accurate measurement of signals is the identification of signal characteristics, namely the definition of the actual physical meaning of the measured signals, such as the bandwidth, frequency, distortion rate, sensing characteristics and the like. In order to find out the current signal characteristics in the operation of the elevator, the embodiment carries out signal extraction work from an elevator inspection site, and acquires the operation current of the elevator by using a broadband digitizer and a broadband fluxgate sensor (a broadband shunt can also be adopted). Fig. 2 shows three-phase current waveforms at the power supply end, and it can be seen that the current distortion at the power supply end is serious, the frequency is power frequency, and the current from the power supply to the frequency converter can be measured in one direction only. The harmonic transformer is needed to accurately measure the severely distorted current, meanwhile, the characteristics of the current signal need to be grasped, and the signal analysis is carried out on the collected current signal by taking the phase A current as an example, and the spectrum of the phase A current is shown in fig. 3, wherein the figure mainly contains odd harmonics. The analysis results of the three-phase current characteristic parameters are shown in tables 1 and 2.
TABLE 1 three-phase current analysis results
| Parameters (parameters) | Phase A | Phase B | Phase C |
| Frequency of | 50.010 | 49.988 | 50.009 |
| Total harmonic distortion rate/(%) | 128.3 | 133.78 | 130.75 |
| Fundamental effective value/(A) | 11.422 | 10.65 | 9.6886 |
| Total effective value/(A) | 18.576 | 17.79 | 15.949 |
TABLE 2 harmonic content of three-phase currents
As can be seen from the analysis result of the signal characteristic parameters, the harmonic content after 25 times is smaller, and the current measuring element needs to meet the correct conduction of a 1.25kHz signal, so that a basis is provided for the model selection of the current measuring instrument for inspection. In addition, when the elevator is lightly loaded or unloaded, if the elevator is only provided with uplink power by the counterweight in the uplink, the loop current of the power supply end is very small or not, and at the moment, because the background current is very small, the noise is large, the signal to noise ratio is low, the measurement error of the current is large, and the current signal needs to be processed in advance.
Step S2, current signal processing:
The method comprises the steps of respectively carrying out full-course operation up and down on a lift car with no load and 25%, 40%, 50%, 75%, 100% and 110% of rated load capacity, and measuring the current value of a motor when the lift car and a counterweight are operated to the same horizontal position;
the original sampling data of the measured current value is subjected to current signal processing, so that the accuracy of a data analysis process is ensured;
The current signal processing comprises one or more of a moving average algorithm, a quasi-synchronous sampling method or an amplitude/phase frequency dynamic compensation method;
sliding average algorithm:
In the elevator balance coefficient test, the accuracy and reliability of current reading cannot be ensured because the running current value of the elevator up/down or on-load/no-load is unstable. The embodiment adopts a sliding average algorithm to improve the accuracy of measurement. Referring specifically to fig. 5, the current samples are sliding averaged. The width of the queue for the moving average is formed by extending a time width of 5% about the time point when the car and the counterweight are at the same horizontal position. Fig. 5 and 6 illustrate the signal processing procedure of the moving average algorithm. In fig. 5, T is the unidirectional full-travel time of the elevator, if the current collection time interval is M, the width of the data queue is 10% T, the total number of data in the queue is n=10%t/M, and the value of N is rounded up. The average value of the queues is calculated according to the formula (1), and the sliding average value of the queues is read at the time T0 corresponding to T/2. The data queue constructed in fig. 6 is in accordance with FIFO principles.
Wherein:
-an arithmetic mean value, a, of N current sample values in the queue;
I j, namely the value of the jth current in the queue, A6;
n-the number of current samples in the queue.
Quasi-synchronous sampling method:
The frequency of the current signal can have certain fluctuation in the elevator operation process, and the sampling is asynchronous due to the fact that the sampler selects the fixed frequency, namely, the discrete data sequence to be analyzed cannot be truncated in a whole period, so that an analysis method error is caused. One common processing method is quasi-synchronous sampling, which filters the frequency characteristic of the original sampled data, takes the filtered signal as a synchronous signal, resamples the original sampled sequence to achieve full-period transformation, and further eliminates errors caused by asynchronous sampling. Fig. 7 shows the effect of quasi-synchronous sampling. And calculating fundamental frequency and zero crossing point information of the synchronous signal, taking the fundamental frequency and zero crossing point information as sampling trigger signals, and resampling the original signal.
Amplitude/phase frequency dynamic compensation method:
When the clamp ammeter or the clamp transformer measures a current signal, amplitude-frequency characteristics and phase-frequency characteristics are two important performance indexes, and are keys for correctly executing current measurement. In general, it is necessary to calibrate it by experimental means. The method comprises the steps of carrying out sweep frequency measurement on amplitude indexes by using a standard signal source under laboratory conditions, analyzing the frequency response of the angle difference by using a shunt with known angle difference (or negligible angle difference) as a comparison reference, and then establishing a mathematical correction model of amplitude frequency and phase frequency according to the measurement result. Fig. 8 and 9 show amplitude-frequency characteristics and phase-frequency characteristics of a certain type of sensor. When current measurement is performed, the amplitude and phase are dynamically compensated according to the frequency analysis result.
And S3, recording the current value after the current signal processing, and drawing a current-load curve, wherein the load rate corresponding to the intersection point of the uplink and downlink operation curves is the balance coefficient of the elevator.
In addition, the current measuring instrument model selection configuration can be performed after the accurate identification of the current signal characteristics is performed in the step S1:
the current signal in elevator operation has rich information, especially in the start-up and braking phases, and changes relatively smoothly in the intermediate constant speed phase, even though the frequency and amplitude of the signal also have time-varying characteristics. Because of the introduction of the variable-current frequency conversion module, the current waveforms at the front end and the rear end of the frequency converter have large difference, and as mentioned above, when serious distortion exists in the signal waveforms, in order to accurately acquire the numerical value of the current characteristic parameter, correct instrument type selection configuration is required, and the indexes mainly examined have bandwidth, amplitude/phase frequency characteristics. According to the rule of the gauge, the measurement error of the current by adopting the secondary loading current method needs to be controlled to be +/-2%, and the measurement error of the power by adopting the no-load power method needs to be controlled to be +/-1%. The literature presently disclosed is silent about the selection of current or power measuring devices. The current main practice is to send a "clamp ammeter" or "power tester" for inspection, and in general, the metering department adopts a standard signal source to perform performance verification, so that the actual performance of the sending inspection equipment in field application cannot be estimated. In order to better develop the performance evaluation of the equipment, the embodiment simulates typical electrical signals which are commonly used under the conditions of abstract complexity and dynamic change under the laboratory condition, and can realize better performance evaluation to a certain extent, thereby providing reference for correctly carrying out the model selection configuration of the instrument. Fig. 10 shows a "phase trigger signal", fig. 11 shows an "analog square wave signal", and fig. 12 shows a "half-wave rectified signal". The following series of synthesized signals are used to perform performance experiments on a certain clamp ammeter and a certain clamp transformer. The amplitude and phase measurement indexes are mainly checked. The results of some experiments are shown in Table 3, FIG. 13 and FIG. 14.
TABLE 3 phase trigger signal amplitude/phase measurement
As can be seen from table 3, under distorted signal conditions, the amplitude error exceeds 2% when the harmonic frequency is higher than 750Hz, or up to 15 harmonics. Considering that the harmonic amplitude measurement error has small error proportion of the total effective value, the total effective value error experiment is also needed, the signal is adopted for verification, the experimental result is shown in table 4, and the result shows that the amplitude measurement error of the clamp ammeter meets the requirement and can be used as a measuring instrument of a secondary loading current method.
TABLE 4 Total effective value measurement error of certain pincerlike ammeter
The current signal characteristics are identified and selected by a current measuring instrument or a current signal processing method is summarized, ① current distortion of a power supply end is serious, frequency is power frequency, a harmonic transformer with good use performance can accurately measure current, ② current of a motor end is basically sine wave but contains certain noise, frequency is generally low-frequency (a down-conversion frequency converter is used), the current is difficult to accurately measure by the common power frequency transformer, an electromagnetic transformer is adopted, when the frequency of the current signal is low, the angle difference of the transformer is large, the measuring accuracy of power can be obviously affected, ③ current from a power supply end to the direction of the frequency converter can be measured in a single direction only, bidirectional current between the frequency converter and the motor can be measured at a motor end, when the elevator is light-loaded or idle, if the elevator is only provided with uplink power by a counterweight, loop current at the power supply end is small or not, the current at the frequency converter end is large and is inverted, the frequency of the frequency converter end is unstable, such as a moving average algorithm is adopted, and the amplitude and the phase frequency of the current at the motor end can be dynamically compensated.
In addition, in the elevator balance coefficient test, only the type selection configuration of the current measuring instrument is made, and the elevator balance coefficient test accuracy can be improved.
The invention improves the elevator balance coefficient checking accuracy by selecting a proper current signal processing method and/or a proper current measuring instrument, adopts a quasi-synchronous sampling method, carries out frequency characteristic filtering treatment on the original sampling data, takes the filtered signal as a synchronous signal, resamples the original sampling sequence to realize full period conversion, further eliminates errors caused by asynchronous sampling, and ensures the accuracy of the data analysis process. The current value is calculated by utilizing a moving average algorithm, so that the problems of large field reading error of workers and large random error of sampling instantaneous fluctuation current are solved, and the working efficiency and the measuring accuracy are greatly improved. When the current is measured, the amplitude and the phase are dynamically compensated according to the analysis frequency, so that the accuracy of measuring the current signal by the clamp ammeter or the clamp transformer is ensured. The method has the advantages that current signal characteristics such as bandwidth, frequency, distortion rate and sensing characteristics are identified, and typical electrical signals which are commonly used under abstract complex and dynamic change working conditions are simulated under laboratory conditions to perform type selection configuration of a current measuring instrument, so that the problems of large current waveform difference between the front end and the rear end of a frequency converter caused by introducing a variable-current frequency conversion module are solved, the method is more suitable for the actual running condition of an elevator, and the method is high in pertinence, practicability and accuracy.
The foregoing is merely illustrative of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211120800.8A CN115594044B (en) | 2022-09-15 | 2022-09-15 | A method for measuring elevator balance coefficient with improved inspection accuracy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211120800.8A CN115594044B (en) | 2022-09-15 | 2022-09-15 | A method for measuring elevator balance coefficient with improved inspection accuracy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115594044A CN115594044A (en) | 2023-01-13 |
| CN115594044B true CN115594044B (en) | 2024-12-06 |
Family
ID=84842411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211120800.8A Active CN115594044B (en) | 2022-09-15 | 2022-09-15 | A method for measuring elevator balance coefficient with improved inspection accuracy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115594044B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2100020T3 (en) * | 1993-03-04 | 1997-06-01 | Otis Elevator Co | POLARIZATION TORQUE FOR MOTORIZATION OF AN ELEVATOR TO PREVENT SLIDING UP OR DOWN. |
| CN101723215B (en) * | 2009-11-27 | 2011-12-07 | 上海永大吉亿电机有限公司 | Method for detecting and compensating starting torque of frequency transformer for elevator |
| CN108147245B (en) * | 2017-12-26 | 2019-05-14 | 福建省特种设备检验研究院 | A kind of elevator energy efficiency test method |
| CN113148791B (en) * | 2021-03-31 | 2022-03-29 | 天津市特种设备监督检验技术研究院(天津市特种设备事故应急调查处理中心) | Rapid calculation method for elevator balance coefficient |
-
2022
- 2022-09-15 CN CN202211120800.8A patent/CN115594044B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| 平衡系数对电梯安全的影响及测试方法优化;李中兴;薛涛;刘英杰;陈国华;;中国安全科学学报;20151115(11);71-75 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115594044A (en) | 2023-01-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101280802B1 (en) | Abnormal sound diagnostic equipment | |
| CN104457956B (en) | Fundamental frequency identification method in a kind of Cable power detection | |
| CN105819293B (en) | A kind of balance coefficient of elevator measurement method | |
| CN103884943B (en) | A kind of comprehensive analysis and diagnosis method of deformation of transformer winding | |
| CN110161421A (en) | A kind of method of battery impedance within the scope of on-line reorganization setpoint frequency | |
| CN114065540A (en) | Framework modal resonance judging method based on dynamic stress, vibration and OMA (open mobile alliance) comprehensive analysis | |
| WO2023000532A1 (en) | New vibration noise test method | |
| CN103991765B (en) | Balance coefficient of elevator test macro and method | |
| CN100391821C (en) | Method for measuring balance coefficient of elevator | |
| CN103712679A (en) | Converter transformer operating state on-line audio analyzing and monitoring system | |
| CN105173946A (en) | Elevator no-load dynamic balance coefficient detector | |
| CN111487318B (en) | Time-varying structure instantaneous frequency extraction method | |
| CN112556828A (en) | Transformer winding loosening fault detection method | |
| CN107543962A (en) | The computational methods of leading m-Acetyl chlorophosphonazo spectrum distribution | |
| CN106516925A (en) | Elevator balance coefficient detector | |
| CN102616156A (en) | Device and method for detecting and elevating contact network state based on electrical capacity analysis | |
| CN105060048B (en) | The detection method and detector of permanent-magnet synchronous towed elevator coefficient of balance | |
| CN202794113U (en) | Online real-time detection device of safety state of steel wire rope | |
| CN115594044B (en) | A method for measuring elevator balance coefficient with improved inspection accuracy | |
| CN106093811B (en) | A kind of transformer core remanent magnetism detection method based on least square method | |
| CN104634493A (en) | Irregularity diagnosis and positioning method for pantograph contact pressure of electrified railway | |
| CN113148791B (en) | Rapid calculation method for elevator balance coefficient | |
| Cho et al. | A waveform distortion evaluation method based on a simple half-cycle RMS calculation | |
| CN108508318B (en) | A method and system for judging the operating state of a transformer unbalanced load | |
| CN108982033A (en) | A method of objectively evaluating automobile door glass clamping stability |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |