CN110132221B - Bridge deflection measuring method for synchronous processing after asynchronous acquisition of multi-inclination-angle sensors - Google Patents
Bridge deflection measuring method for synchronous processing after asynchronous acquisition of multi-inclination-angle sensors Download PDFInfo
- Publication number
- CN110132221B CN110132221B CN201910469978.5A CN201910469978A CN110132221B CN 110132221 B CN110132221 B CN 110132221B CN 201910469978 A CN201910469978 A CN 201910469978A CN 110132221 B CN110132221 B CN 110132221B
- Authority
- CN
- China
- Prior art keywords
- inclination angle
- bridge
- sensors
- deflection
- data
- 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
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The invention belongs to the technical field of tilt sensor measurement, and relates to a bridge deflection measurement method for synchronous processing after asynchronous acquisition of multiple tilt sensors, which comprises the following steps: s1, arranging a plurality of inclination angle sensors on the bridge, connecting the inclination angle sensors with a collecting instrument, and setting the collecting frequency of the inclination angle sensors; s2, under the load action of the bridge structure, dynamic deformation with stable deflection deformation mean value occurs, and the change value of the dynamic deformation of the bridge structure is measured by utilizing multiple tilt sensors to obtain asynchronous acquisition data of each tilt sensor; s3, adopting a software mode to realize interpolation synchronization on the asynchronously acquired data of the plurality of inclination sensors; and S4, obtaining a bridge structure deflection curve through deflection conversion based on the data after interpolation synchronization. The invention can effectively improve the measuring efficiency and reduce the cost of the instrument; the software processing is utilized, the synchronization of the measured data is indirectly realized through an interpolation mode, the realization cost is low, and the efficiency is higher.
Description
Technical Field
The invention belongs to the technical field of inclination angle sensor measurement, and relates to a bridge deflection measuring method for synchronous processing after asynchronous acquisition of multiple inclination angle sensors.
Background
Tilt sensors are also known as tilt sensors, goniometers or grade sensors. The theoretical basis for tilt sensors is newton's second law. When the sensor has no acceleration in the lateral and vertical directions, only the gravity acceleration acts on the sensor, and the angle between the vertical axis of gravity and the sensitive axis of the acceleration sensor is the inclination angle.
The tilt sensor is used as an electronic instrument, the acquisition mode of the tilt sensor is data communication and generally comprises synchronous communication and asynchronous communication, and the two different communication modes lead to two modes of synchronous acquisition and asynchronous acquisition of the acquired data of the sensor.
Synchronous communication is a communication method for continuously and serially transmitting data, and only one frame of information is transmitted at a time as shown in fig. 1. With synchronous communication, a plurality of characters are grouped into a message group so that the characters can be transmitted one after the other.
Asynchronous communication is a very common communication method, and as shown in fig. 2, when characters are transmitted, the time interval between the transmitted characters can be arbitrary. The benefit of asynchronous communication is that the communication device is simple and cheap.
If synchronous communication can be realized by the transmission of the plurality of inclination angle sensors, the measurement values of the plurality of sensors at the same time of the structure can be measured, and then the deformation value is obtained by an integral method. A problem exists in that synchronous communication needs to rely on a clock signal, who is the clock signal to initiate? In synchronous communication, a clock signal reading module is often required to be arranged, so that the sensor can acquire data at equal time intervals, the cost of sensor hardware is increased due to the arrangement, a large amount of time sequence data needs to be processed by the sensor, and the measuring efficiency is greatly reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a bridge deflection measuring method for synchronous processing after asynchronous acquisition of multiple inclination angle sensors.
The invention is realized by adopting the following technical scheme:
the bridge deflection measuring method of the multi-inclination-angle sensor after asynchronous acquisition and synchronous processing comprises the following steps:
s1, arranging a plurality of inclination angle sensors on the bridge, connecting the inclination angle sensors with a collecting instrument, and setting the collecting frequency of the inclination angle sensors;
s2, under the load action of the bridge structure, dynamic deformation with stable deflection deformation mean value occurs, and the change value of the dynamic deformation of the bridge structure is measured by utilizing multiple tilt sensors to obtain asynchronous acquisition data of each tilt sensor;
s3, adopting a software mode to realize interpolation synchronization on the asynchronously acquired data of the plurality of inclination sensors;
and S4, obtaining a bridge structure deflection curve through deflection conversion based on the data after interpolation synchronization.
Preferably, the non-synchronously acquiring data in step S2 includes: dip angle measurement thetaiAnd acquisition time ti。
Preferably, in step S3, the data of the same acquisition time and the same acquisition time interval at the beginning of the acquisition of each tilt sensor is indirectly obtained through interpolation synchronization.
Further, interpolation synchronization is to obtain the inclination angle measurement value of each inclination angle sensor at the same moment by a specific interpolation mode according to the known moment and the inclination angle value at the moment.
Preferably, different interpolation modes are selected according to different precision requirements.
Preferably, step S3 includes:
for each tilt sensor tilt measurement thetaiFitting by adopting a proper interpolation mode to obtain a function relation of each inclination angle sensor measurement value and time: thetai＝f(ti) And i is 1 to n, and n is the number of the arranged inclination angle sensors.
Preferably, step S4 includes:
s41, selecting a certain time T, and calculating the inclination angle measurement value theta of each inclination angle sensor at the timeiF (T), at this timeObtaining the measured value theta of each inclination angle sensor at the momenti(T)；
S42, using segmented integral superposition method yi＝∑LitanθiAnd (T), Li is the length of each section, and the dip angle measurement value obtained by interpolation is converted into a vertical deformation value to obtain the deflection deformation of the bridge at the moment T.
Compared with other tilt angle sensor synchronous acquisition modes, the invention has the following beneficial effects:
(1) the data acquired by the multi-inclination-angle sensor in an asynchronous mode are converted into data at the same time in a proper mode, namely, synchronous acquisition is indirectly realized, and when the inclination angle value acquired in the mode is used for calculating the deformation of the bridge structure, the measuring efficiency can be effectively improved and the cost of an instrument can be effectively reduced.
(2) The synchronous acquisition of the data of the multi-tilt sensor can be realized by setting an acquisition mode of hardware, but when the tilt sensor is manufactured, a relevant program is embedded inside, and the realization cost is high. The invention indirectly realizes the synchronization of the measured data by utilizing software processing and an interpolation mode, and has low realization cost and higher efficiency.
(3) When the multi-inclination sensor obtains the deflection deformation of the bridge structure by using asynchronous acquisition, the dynamic instantaneous deflection curve of the bridge structure has large discreteness and basically does not accord with the deformation curve of an actual bridge. The dynamic instantaneous deflection curve of the bridge obtained by synchronously processing the asynchronously acquired data through software conforms to the deformation shape of the bridge, and the dynamic instantaneous deflection curve of the bridge structure can be reasonably measured and is more reasonable than that without synchronous processing.
Drawings
FIG. 1 is a schematic diagram of synchronous communication;
FIG. 2 is a schematic diagram of asynchronous communications;
FIG. 3 is a flow chart of a method for measuring bridge deflection after asynchronous acquisition and synchronous processing of multiple inclination sensors according to an embodiment of the present invention;
FIG. 4 is a graph of dynamic instantaneous deflection measured by inclinometer without simultaneous processing according to one embodiment of the invention;
FIG. 5 is a schematic diagram illustrating the interpolation synchronization principle according to an embodiment of the present invention;
FIG. 6 is a graph of dynamic instantaneous deflection as measured by the interpolated simultaneous caster method in accordance with an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.
Because sampling clocks of certain types of tilt sensors are inconsistent when the tilt sensors collect data, and the data are collected at unequal intervals, a plurality of tilt sensors do not collect data at the same time when the bridge structure is changed. When the inclination angle sensor is used for measuring the deflection deformation of the bridge, data acquired by asynchronous acquisition caused by different acquisition time are processed into data with the same acquisition time, so that the synchronous acquisition of the data and the calculation of the deformation of the bridge are indirectly realized. The invention provides a method for synchronously processing and calculating the deformation of a bridge after multipoint asynchronous acquisition of an inclination angle sensor based on an interpolation synchronization mode.
The bridge deflection measuring method of synchronous processing after asynchronous acquisition of the multi-inclination-angle sensor is shown in figure 3 and comprises the following steps:
and S1, measuring the vertical deflection deformation of the bridge structure by using the multi-tilt-angle sensor.
The bridge is provided with n inclination sensors which are connected with a collecting instrument, and the collecting frequency of the sensors is set.
S2, under the load action of the bridge structure, the dynamic deformation with stable deflection deformation mean value occurs, the change value of the dynamic deformation of the bridge structure is measured by utilizing the multiple tilt sensors, and the tilt angle measured value theta of each tilt sensor is obtainediAnd acquisition time ti。
S3, measuring the inclination angle theta of each inclination angle sensoriFitting by adopting a proper interpolation mode to obtain a function relation of each inclination angle sensor measurement value and time: thetai＝f(ti)，(i＝1～n)。
S4, selecting a certain time T, and calculating each inclination angle sensing at the timeMeasurement of the inclination of the device, thetaiF (t), the measured value θ of each inclination angle sensor at that time is obtainedi(T)。
S5, using segmented integral superposition method yi＝∑LitanθiAnd (T), Li is the length of each section, and the dip angle measurement value obtained by interpolation is converted into a vertical deformation value to obtain the deflection deformation of the bridge at the moment T.
In this embodiment, 4 tilt sensors are installed on the bridge. At the start of the test, each tilt sensor reading was recorded by resting for 2 minutes. The mean value of the readings of each tilt sensor over 2 minutes was taken as the respective initial value, and then the weight loading was performed at the mid-span position of the simply supported beam. And (4) loading a test weight once, and recording the reading of each inclination angle sensor within 2 minutes after the simply supported beam is stabilized. And under the static loading state of the simply supported beam, giving an instant vertical force to the midspan position to enable the simply supported beam to generate vertical free vibration in the elastic deformation stage, and recording the reading of the time period from the static state after loading to the static state after vibration of each tilt angle sensor.
And under the static state after loading, taking the average value of the readings in the recording time as measurement data to obtain the deflection value of each measuring point under the static state after loading, and taking the deflection value as the static deflection of the simply supported beam after loading.
When the simply supported beam vibrates, deflection conversion is directly carried out according to the inclination values simultaneously displayed by the 4 sensors on the acquisition instrument, the deflection is used as a dynamic test result, the curves of 4 tests and a static state are compared, and the result is shown in figure 4. As can be seen from FIG. 4, the dynamic instantaneous deflection curve in the dynamic test result has large discreteness and basically does not conform to the deformation curve of the actual test beam.
The time and the inclination angle data of each inclination angle sensor at a certain moment obtained in the test are shown in table 1, and the actual measurement data of the inclination angle sensors in table 1 shows that when the sensors are collected by using a sampling frequency of 20Hz, a collector can return 20 inclination angle measurement values in 1 second, but the time intervals for collecting 20 measurement values of the same inclination angle sensor are unequal as can be seen from the time data in the millisecond level; meanwhile, when the plurality of inclination sensors are used for measurement, the initial time of the simultaneous response of the plurality of inclination sensors is different, so that the difference of time exists between the data of each inclination sensor when the deflection is converted by directly utilizing the inclination value simultaneously displayed on the acquisition instrument.
According to the dynamic deflection test result, the measured value of the inclination angle in the single test is not the actual measured value of the bridge structure in the same state, namely synchronous measurement is not realized, so that the measured dynamic instantaneous deflection curve does not conform to the actual change. This is because each tilt sensor has its own clock, and when the bus type acquisition instrument is used to obtain actual tilt readings, the obtained tilt readings are not all values at the same time due to the time of instruction transmission and the response speed of each tilt sensor after receiving the instruction, which is a problem in tilt sensor hardware and cannot realize synchronous acquisition.
TABLE 1 Tilt Angle sensor actual measurement data
Note: 1. the display of time is absolute time in units of time: dividing into: second: milliseconds.
2. The tilt angle is the absolute angle displayed by the sensor in degrees.
In order to realize synchronous acquisition of data of multiple tilt sensors in a test, on one hand, the synchronous acquisition can be realized by setting an acquisition mode of hardware, but when the tilt sensors are manufactured, related programs are embedded inside the tilt sensors, so that the realization cost is high. On the other hand, the method can be realized by software processing, the synchronization of the measurement data is indirectly realized by an interpolation mode, and the interpolation synchronization specifically comprises the step of obtaining the inclination angle measurement value of each inclination angle sensor at the same moment by a specific interpolation mode according to the known moment and the inclination angle value at the moment.
Fig. 5 is a schematic diagram illustrating a principle of interpolation synchronization of tilt angle values, where a measuring point 1 and a measuring point 2 respectively represent a tilt angle sensor 1 and a tilt angle sensor 2, a solid line is a time-course curve of tilt angle values fitted by tilt angle values actually acquired by the tilt angle sensors, the acquisition time intervals of the same tilt angle sensor are not equal, and the acquisition times of multiple tilt angle sensors are not equal, which causes the asynchronization of actually acquired data of the measuring point 1 and the measuring point 2. In this embodiment, a curve obtained by fitting actual collection points of each measurement point is inserted into time points with the same time and the same time interval, so as to obtain an inclination angle value of the corresponding time point. In this way, synchronous acquisition of data of a plurality of tilt sensors is achieved.
According to the interpolation synchronization principle, data processing in the same mode is carried out on the data acquired by each tilt angle sensor, synchronous processing of non-synchronous acquired data is achieved, and the data after interpolation synchronous processing is shown in table 2. There are many interpolation methods, such as linear interpolation, lagrange interpolation, newton interpolation, etc. Different interpolation modes can be selected according to different precision requirements, and linear interpolation is generally selected for simplicity
By means of interpolation synchronization, the initial time of each inclination angle sensor is the same when in acquisition, and the acquired time intervals are equal. And obtaining a deflection curve of the bridge structure through deflection conversion according to the inclination value change data after interpolation synchronization. The results of 4 of these tests were compared with those of the static state, and the results are shown in FIG. 6.
TABLE 2 Dip sensor interpolation synchronization data
Note: 1. the time unit is as follows: dividing into: second: millisecond (ms)
2. The inclination angle is the absolute angle displayed by the sensor and the unit is degree
It can be seen from fig. 6 that when the interpolation synchronization is used to indirectly achieve the synchronization of the acquisition, the dynamic instantaneous deflection curve of the test result obtained by the interpolation synchronization is more reasonable than that obtained without the synchronization processing, and the dynamic instantaneous deflection curve basically conforms to the deformation shape of the loaded simply supported beam when the beam is free to vibrate. The displacement of the right hand abutment point of the curve is not closed due to the cumulative error in the angle measurement. From the test results, the dynamic instantaneous deflection deformation of the bridge structure can be reasonably measured by the bridge deflection measuring method for synchronously processing the asynchronously acquired data of the multiple inclination angle sensors.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (6)
1. The bridge deflection measuring method of the synchronous processing after the asynchronous acquisition of the multi-inclination-angle sensor is characterized by comprising the following steps of:
s1, arranging a plurality of inclination angle sensors on the bridge, connecting the inclination angle sensors with a collecting instrument, and setting the collecting frequency of the inclination angle sensors;
s2, under the load action of the bridge structure, dynamic deformation with stable deflection deformation mean value occurs, and the change value of the dynamic deformation of the bridge structure is measured by utilizing multiple tilt sensors to obtain asynchronous acquisition data of each tilt sensor;
s3, adopting a software mode to realize interpolation synchronization on the asynchronously acquired data of the plurality of inclination sensors; the interpolation synchronization includes: according to the inclination angle values at the known moment and the known moment, fitting in a specific interpolation mode to obtain an inclination angle value time-course curve of each inclination angle sensor, and inserting time points with the same time and the same time interval into the inclination angle value time-course curve so as to obtain an inclination angle measured value of each inclination angle sensor at the same moment;
and S4, obtaining a bridge structure deflection curve through deflection conversion based on the data after interpolation synchronization.
2. The bridge deflection measuring method according to claim 1, wherein the non-synchronously acquiring data in step S2 comprises: dip angle measurement thetaiAnd acquisition time ti。
3. The bridge deflection measuring method according to claim 1 or 2, wherein in step S3, the data with the same initial time and the same collected time interval are obtained indirectly by interpolation synchronization when each tilt sensor collects data.
4. The bridge deflection measurement method according to claim 1, wherein different interpolation modes are selected according to different precision requirements.
5. The bridge deflection measuring method according to claim 1 or 4, wherein step S3 includes:
for each tilt sensor tilt measurement thetaiFitting by adopting a proper interpolation mode to obtain a function relation of each inclination angle sensor measurement value and time: thetai＝f(ti) And i is 1 to n, and n is the number of the arranged inclination angle sensors.
6. The bridge deflection measuring method of claim 5, wherein step S4 includes:
selecting a certain moment T, and calculating the inclination angle measurement value theta of each inclination angle sensor at the momentiF (t), the measured value θ of each inclination angle sensor at that time is obtainedi(T)；
Using segmented integral superposition method yi＝∑Litanθi(T)，LiAnd converting the inclination angle measured value obtained by interpolation into a vertical deformation value for the length of each section to obtain the deflection deformation of the lower bridge at the time T.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910469978.5A CN110132221B (en) | 2019-05-31 | 2019-05-31 | Bridge deflection measuring method for synchronous processing after asynchronous acquisition of multi-inclination-angle sensors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910469978.5A CN110132221B (en) | 2019-05-31 | 2019-05-31 | Bridge deflection measuring method for synchronous processing after asynchronous acquisition of multi-inclination-angle sensors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110132221A CN110132221A (en) | 2019-08-16 |
| CN110132221B true CN110132221B (en) | 2020-09-18 |
Family
ID=67583267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910469978.5A Active CN110132221B (en) | 2019-05-31 | 2019-05-31 | Bridge deflection measuring method for synchronous processing after asynchronous acquisition of multi-inclination-angle sensors |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110132221B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111692985B (en) * | 2020-06-19 | 2022-01-28 | 交通运输部公路科学研究所 | Constant-load deflection analysis method for single-span simply-supported girder bridge under traffic passing condition |
| CN111795790A (en) * | 2020-06-29 | 2020-10-20 | 广东华交科工程科技有限公司 | Bridge deflection synchronous acquisition method, monitoring device and processing base station |
| CN111895963A (en) * | 2020-06-30 | 2020-11-06 | 同恩(上海)工程技术有限公司 | Small deformation member deflection monitoring method and system based on rigidity fitting and storage medium |
| CN112229587A (en) * | 2020-10-10 | 2021-01-15 | 哈尔滨工业大学 | Method for indirectly measuring dynamic deflection of high-speed rail bridge based on inclinometer |
| CN112697373B (en) * | 2021-01-22 | 2023-03-24 | 扬州大学 | Method for estimating displacement of railway bridge with damaged component |
| CN113092038B (en) * | 2021-04-09 | 2022-07-05 | 云南大学 | Sensor assembly and method for measuring internal force of bridge flexural member |
| CN113610136A (en) * | 2021-07-30 | 2021-11-05 | 深圳元戎启行科技有限公司 | Sensor data synchronization method and device, computer equipment and storage medium |
| CN114910044A (en) * | 2022-03-31 | 2022-08-16 | 浙江瑞邦科特检测有限公司 | Method for measuring deformation of flexural member and portable dynamic real-time monitoring device |
| CN115183743B (en) * | 2022-06-28 | 2023-12-26 | 中国五冶集团有限公司 | Inclination sensor tunnel deformation monitoring system and method |
| CN115391883B (en) * | 2022-08-11 | 2024-02-02 | 华南理工大学 | Calculation method for manufacturing inclination angle of end face of large-section steel box girder |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010071571A1 (en) * | 2008-12-15 | 2010-06-24 | Alignment Systems Ab | Device and method for measuring a construction |
| CN102305612A (en) * | 2011-08-17 | 2012-01-04 | 同济大学 | Displacement/deflection measuring system and method |
| CN106248044A (en) * | 2016-07-14 | 2016-12-21 | 苏交科集团股份有限公司 | A kind of bridge full-bridge Multi-point deflection real-time acquisition and display system |
| CN108483259A (en) * | 2018-03-22 | 2018-09-04 | 东南大学 | A kind of tower crane inclination angle and amount of deflection on-line monitoring system and data method |
-
2019
- 2019-05-31 CN CN201910469978.5A patent/CN110132221B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010071571A1 (en) * | 2008-12-15 | 2010-06-24 | Alignment Systems Ab | Device and method for measuring a construction |
| CN102305612A (en) * | 2011-08-17 | 2012-01-04 | 同济大学 | Displacement/deflection measuring system and method |
| CN106248044A (en) * | 2016-07-14 | 2016-12-21 | 苏交科集团股份有限公司 | A kind of bridge full-bridge Multi-point deflection real-time acquisition and display system |
| CN108483259A (en) * | 2018-03-22 | 2018-09-04 | 东南大学 | A kind of tower crane inclination angle and amount of deflection on-line monitoring system and data method |
Non-Patent Citations (1)
| Title |
|---|
| 考虑施工过程的异形建筑结构概率分析;徐郁峰等;《建筑结构学报》;20110805;第32卷(第8期);第120-126页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110132221A (en) | 2019-08-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110132221B (en) | Bridge deflection measuring method for synchronous processing after asynchronous acquisition of multi-inclination-angle sensors | |
| US20070219751A1 (en) | Sensor network data alignment with post-process resampling | |
| CN102539107B (en) | Method for accurately synchronizing test signals of wind tunnel | |
| CN100410667C (en) | Low speed measuring-correcting instrument and ocrrecting method | |
| CN104254761B (en) | Sensor time synchronization | |
| RO118549B1 (en) | Apparatus and method for the calibration of a sensor system by using the fast kalman filtering | |
| CN103808349A (en) | Error correction method and device for vector sensors | |
| CN106932125B (en) | Compensation method of silicon resonance pressure sensor | |
| CN108107233B (en) | Method and system for continuous temperature correction of accelerometer scale factors | |
| CN115508040B (en) | Synchronous parallel acquisition system for data of speed field and temperature field and application method | |
| CN105973426A (en) | Weight measurement method and system thereof | |
| CN202869645U (en) | Portable vibration measuring instrument based on Android platform mobile phone | |
| CN102914414B (en) | Vibration measuring instrument based on Android platform mobile phone and detection method thereof | |
| CN113624228B (en) | Synchronous calibration device and method for image sensor and accelerometer | |
| CN111860551B (en) | Multi-sensor data fusion method and device and vehicle-mounted terminal | |
| CN108847921B (en) | Distributed vibration synchronous continuous monitoring system | |
| CN112985867B (en) | Steering engine testing method, device, equipment and storage medium | |
| CN104897169B (en) | A kind of dynamic accuracy test system and method for Miniature posture module | |
| CN116499696B (en) | Method for improving dynamic accuracy of attitude angle of wind tunnel model test model | |
| CN210271424U (en) | Self-testing device for modal analysis | |
| JP2009030990A (en) | Seismometer | |
| CN115900760A (en) | Method, device and system for testing dynamic characteristics of gyroscope and storage medium | |
| CN108957174B (en) | Voltage sag detection device and method | |
| CN115164941A (en) | Vibration testing device and testing method for inertial navigation equipment | |
| CN103822768B (en) | A kind of ultra-low-frequency horizontal is to the static equalising means of shaking table guide rail irregularity |
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 |