CN201047798Y - Virtual vibration table detecting apparatus - Google Patents
Virtual vibration table detecting apparatus Download PDFInfo
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- CN201047798Y CN201047798Y CNU2007200544222U CN200720054422U CN201047798Y CN 201047798 Y CN201047798 Y CN 201047798Y CN U2007200544222 U CNU2007200544222 U CN U2007200544222U CN 200720054422 U CN200720054422 U CN 200720054422U CN 201047798 Y CN201047798 Y CN 201047798Y
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Abstract
The utility model relates to the field of a virtual vibration table detecting equipment, and aims at overcoming the weaknesses of the prior art so as to design a virtual vibration table detecting equipment that has high integration and is applicable to the virtual apparatus. The structure of the utility model comprises an acceleration sensor, a signal modulating equipment, a data collecting card and a computer, which are connected in series, wherein, the signal modulating equipment and the data collecting card are arranged inside an independent shell to form an externally-hanging data collecting device that is connected with the computer through a USB interface. Adopting the externally-hanging data collecting device, the utility model has the advantages of large data throughput, inexpensive price, convenient carry, etc. Adopting the data collecting device can not only have the measuring quality of the top-grade apparatus, but also can satisfy the multiplicity of the measuring requirements. The proposal is not only practical for different requirements, but also has high cost performance, and is a virtual apparatus configuration proposal that is particularly applied to the national conditions of China.
Description
Technical field
The utility model relates to virtual oscillating table checkout equipment field, and it is a kind of easy to use to say so more specifically, is applicable to the virtual oscillating table checkout equipment of virtual oscillating table signal processing method.
Technical background
In parameter measurement in the past, because the parameter distributions many, measure field of measuring are wide, therefore need multiple separate type surveying instrument such as charge amplifier, voltage table, frequency meter, distortion meter etc., be with great inconvenience to measurement.Adopted digitized frequency meter, dynamic signal analyzer afterwards, but these instruments mainly depend on import, the processing technology complexity manufacture level is required height, and it is higher to buy the used expense of these instruments, and the passage of instrument is few, and use is restricted.That application is maximum at present mainly is B﹠amp; The PULSE vibration test system of K, though it is many that it has function, the analysis precision advantages of higher, but the price that it is expensive, add English operation interface and limited popularization and the use at home of this quasi-instrument, and still adopting artificial calculation mode for some test event, automaticity is not high.
So-called virtual instrument (Virtual Instrument, be called for short VI), be exactly the user on universal computer platform, the test function that designs an apparatus of definition makes the user the same at his self-designed testing tool of operation according to demand.The appearance of virtual instrument, broken traditional instrument producer's definition has been arranged, the mode of operation that the user can't change, make that the user can be according to the demand of oneself, design oneself instrument system, in test macro and instruments design, use software replace hardware as far as possible, make full use of the function that computer technology realized and expanded legacy test system and instrument." software is exactly instrument " is that virtual instrument concept is the simplest, the most essential summary.
Metering is defined as " realizing that unit unification, value are movable accurately and reliably ", and it has accuracy, unitarity, traceability, legal system characteristics.The metering activity can be regarded the test process of verifying character as, and purpose is that the test data of guaranteeing instrument has necessary accuracy and reliability, to satisfy the demand of test.
For traditional instrument, its metrology and measurement is relatively easy, and metrological personnel can be carried out concrete gage work according to the measurement technology rules of country, department or local promulgation.And in national measure base standard device and metering testing system based on virtual instrument technique, although use a computer, application software and instrument moduleization can increase substantially integrated, the robotization and the intelligent degree of device and system, meanwhile brought following problem.
The accuracy or the uncertainty of measurement of each instrument of conventional metered dose standard set-up can be determined by periodic calibration, and by analyzing all kinds of error sources the size of measured uncertainty contribution be assessed.For using the very high measuring system of the integrated degree of virtual instrument technique, the accuracy of data acquisition is the basis of virtual test system, and the accuracy of software module is the soul of virtual test system.Bigger to the accuracy influence of system for hardware module in A/D conversion link that is sent to computing machine by sensor and signal condition link; And the uncertain component that the data algorithm that uses in the virtual instrument software programming brings and any one little careless mistake of appearance all may exert an influence to calibration result, therefore be difficult to assessment and measure the size of each error source, so can't carry out the assessment of uncertainty more according to the conventional method to tested value influence.
The utility model content
The purpose of this utility model is to overcome defective of the prior art, designs a kind of integrated level height, is applicable to the virtual oscillating table checkout equipment of virtual instrument.
The utility model is achieved through the following technical solutions its purpose.
The virtual oscillating table checkout equipment that the utility model is designed, structure comprises acceleration transducer, signal condition equipment, data collecting card and computing machine, the said equipment connects successively, described signal condition equipment and data collecting card are installed in independently and form the external hanging type data collector in the housing, are connected with computing machine by USB interface.Adopt the external hanging type data collector, it is big that it has a data throughout, and low price such as is convenient for carrying at advantage, adopts the data collector of the type both to have the measurement quality of top-grade instrument, can satisfy the diversity of measurement demand again.To most of demands, this scheme is not only practical, and has very high cost performance, is a kind of virtual instrument allocation plan that is particularly suitable for China's national situation.
Described acceleration transducer comprises a three-dimensional acceleration transducer and at least four unidirectional acceleration transducers.Wherein a unidirectional acceleration transducer is installed and is used for the test distortion degree in the center position of shaking table, in center position a three-dimensional acceleration transducer is installed and is used to test aspect ratio, the connection of rigidity is no less than three unidirectional acceleration transducers and is used to test uniformity coefficient on shaking table.
Acceleration transducer of the present utility model adopts piezoelectric acceleration transducer, piezoelectric acceleration transducer is a kind of easy for installation, use vibration detecting sensor widely, it has, and volume is little, in light weight, mechanism is simple, reliable operation, signal to noise ratio (S/N ratio) height, advantage such as easy for installation.
The design's signal condition equipment adopts charge amplifier, and for fear of the appearance of signal aliasing, conditioner should contain the anti-aliasing filtering module simultaneously.
Computing machine is connected with signal condition equipment by serial ports, can realize program control to signal condition equipment by serial ports of computers.
The deficiency that is faced in view of current shaking table testing tool, at the demand of market for low price, high-performance shaking table parameter detection device, the utility model has adopted advanced signal processing technology and USB interface-based Portable Data Acquisition Device, greatly reduce testing cost, the robotization that has incorporated data is simultaneously handled, under the prerequisite that guarantees measuring accuracy and reliability, improved testing efficiency.
Description of drawings
Fig. 1 is the utility model system architecture synoptic diagram;
Fig. 2 position system module figure of the present utility model;
Fig. 3 is the synoptic diagram of acceleration transducer installation site on shaking table.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further.
Shaking table is a kind of device that various vibration environments are investigated the product functional reliability of simulating, and can be divided into electrodynamic type vibration table and mechanical type vibration table according to structural principle.Usually meet the requirement of national relevant art standard in order to ensure the operation conditions of shaking table, to carry out the relevant parameters test at various shaking table, the test index of its medium frequency, acceleration, speed, displacement, aspect ratio, degree of distortion, seven parameters of homogeneity is to weigh the key of shaking table quality, so the shaking table testing synthesis parameter is just at the test of above-mentioned seven parameters.
The shaking table testing synthesis parameter at first will be installed on the tested shaking table 4 by degree of will speed up sensor, specifically as shown in Figure 3: for frequency (f), acceleration (a), speed (V), displacement (D), the test of degree of distortion (S), only need a unidirectional acceleration transducer 1 to be installed, select different Frequency points to test respectively then in center position; Test request for aspect ratio is installed a three-dimensional acceleration transducer 2 in center position, choose a plurality of frequency values according to octave, and under given amplitude, vibrate, get the acceleration amplitude of three directions from the vialog successively, and calculate aspect ratio T according to following formula:
In the formula: a
x, a
yThe component of two mutually perpendicular acceleration amplitudes of-vertical and the main direction of shaking, m/s
2
a
z-be the acceleration amplitude of the main direction of shaking, m/s
2
Then need again to measure the acceleration amplitude of each position then successively, and to measure its uniformity coefficient N with the connection of four unidirectional acceleration transducer 3 rigidity as shown in the figure for uniformity test according to following formula.
In the formula: during the a-homogeneous is measured, the acceleration amplitude of central point, m/s
2
| during Δ a|-homogeneous is measured, the maximum deviation (absolute value) of each point Jia Dudu and central point acceleration, m/s
2
According to relevant technologies standard-requireds such as JJG 189-97, JJG 190-97, JJG298-2005, its maximum should be surveyed characteristic parameter and contain: vibration displacement D, vibration velocity V, vibration acceleration a, vibration frequency f, vibrational waveform degree of distortion S, vibration acceleration homogeneity N, shaking table transverse acceleration T, it is as follows to require system to satisfy the measured parameter technical indicator:
1. test frequency scope 5HZ-4KHz, require frequency measurement accuracy be better than ± 0.1%
2. testing acceleration scope 0.1-2000m/s
2, the acceleration amplitude precision is better than ± 3%, and displacement is better than ± and 5%
Require system to have vibrating data collection, analysis, storage, demonstration, printing reports function simultaneously, and be easy to carry.
Virtual instrument has constituted different architectures according to different classification forms, has passed through the development of decades, and virtual instrument has formed following several important architectures: GPIB, PXI, VXI, PC-DAQ.Do with comparison with regard to the relative merits of various architectures below, and, select a kind of suitable architecture in conjunction with the utility model requirement.
GPIB (HP-IB or IEEE488)-universal serial port bus is the interface of computing machine and traditional instrument.The various instruments that include gpib interface can be coupled together by gpib bus, thereby can realize automatic test based on traditional instrument.Its advantage is utilized traditional instrument exactly, can reduce the expense of building of system, but, because the data capability of handling up limited (1Mb/s) of bus itself, and its brick pattern mode of building makes that test macro itself is huger, be difficult to satisfy the needs of on-the-spot test, therefore use to be subjected to certain restriction.
VXI(VME Extension for Instrumentation)。Its version is with various standard modules such as signals collecting, the signal condition standard PC case of packing into, and cabinet is by inserting card or the embedded controller and the computing machine communication of computing machine.VXI observes the software specifications and the VXI alliance relevant hardware standard of VPP alliance defined, and system has very high reliability, compatibility and integrated level, but because the selling at exorbitant prices of VXI is mainly used in most advanced and sophisticated field tests such as Aeronautics and Astronautics.
PXI(PCI Extension for Instrumentation)。PXI is the instrument expansion of pci bus.Its version and VXI are basic identical, and difference is that bus difference (transfer rate reaches 132Mb/s) and price are more acceptant, and present NI company tries hard to recommend the product of PXI bus, and it has broad application prospects, but price is still than higher.
The PC-DAQ architecture is to be simple and easy to a kind of of usefulness most in the virtual instrument architecture, and its implementation has following two kinds.A kind of is directly to insert general data collecting card (being called the interpolation type data collecting card again) in general PC slot, finishes the function of test macro by software programming control data capture card.Its advantage is that the system constructing cost is minimum, is convenient to use in the laboratory, and shortcoming is that system noise is bigger, is not easy to carry, and Electro Magnetic Compatibility and system reliability are relatively poor.Another is the external hanging type data collector that utilizes the USB of computing machine, it is big that it has a data throughout, and low price such as is convenient for carrying at advantage, adopt the data collector of the type both to have the measurement quality of top-grade instrument, can satisfy the diversity of measurement demand again.To most of demands, this scheme is not only practical, and has very high cost performance, is a kind of virtual instrument allocation plan that is particularly suitable for China's national situation.
Described as shown in Figure 1 signal condition equipment and data collecting card are installed in independently and form external hanging type data collector 8 in the housing, are connected with computing machine 7 by USB interface, and input is used to gather the signal of acceleration transducer on the shaking table 4.
Vibration signal detects and is realized by sensor, usually the most frequently used acceleration transducer has following several: piezoelectric acceleration transducer, ICP (Integrated Circuits Piezoelectric) formula acceleration transducer, capacitance acceleration transducer and piezoresistive accelerometer, wherein capacitance acceleration transducer is used for the vibratory impulse test more, piezoresistive transducer is used for measuring shock pulse signal when long more, the ICP sensor also is widely used in the vibration-testing field, but just the range of using at present adopts existing piezoelectric acceleration transducer or main flow.Piezoelectric acceleration sensor is a kind of easy for installation, use vibration detecting sensor widely, it has that volume is little, in light weight, mechanism is simple, reliable operation, signal to noise ratio (S/N ratio) height, advantage such as easy for installation are taken all factors into consideration various factors, and this paper selects for use piezoelectric acceleration sensor as vibration detecting sensor.
The charge signal that comes from sensor can't be measured with data acquisition equipment, topmost problem is the requirement that the electric charge parameter does not reach Computer Processing, and very easily be subjected to The noise, and also may there be very high kurtosis in some signal, therefore before converting them to digital quantity, to amplify, pre-service such as filtering, and require the signal condition module to have antijamming capability.The shortcoming of the manual control of the utility model abandoning tradition charge amplifier requires charge amplifier to include programmable interface (as RS232) in addition.The multi-functional advance signal conditioning device 5 of YE5864 of for this reason selecting for use Yangzhou Radio No.2 Factory to produce, can electric charge, multiple input mode inputs (convenient later upgrading) such as voltage, ICP, be provided with double integration circuit simultaneously, the anti alias filter that gear is adjustable, this signal condition equipment 5 can be realized program control to signal condition equipment 5 by computing machine 7 serial ports, as shown in the figure.
Combined system is as shown in Figure 2 then according to above-mentioned steps apolegamy equipment, acceleration transducer 1,2,3 is gathered the vibration signal of shaking table 4, after the conditioning of signal condition equipment 5, enter data collecting card 6, data collecting card 6 is finished and after corresponding A/D transforms data is passed to computing machine by usb bus, computing machine 7 is responsible for data are carried out discrete Fourier transform (DFT) and digital signal frequency domain filtering, carry out pre-service by the signal behind the frequency domain filtering, by an integration output speed component, twice integration exported displacement component then.Simultaneous computer 7 can be realized the control to conditioning device 5 by the parameter of RS232 mouth signalization conditioning device 5.
The test value that below is the dynamic signal analyzer ATS of the utility model equipment and Audio Precision company production is done to compare.
Test result deck watch
The amplitude-frequency test error that can be calculated system by last table is as follows:
The test error deck watch
From table we as can be seen, the precision of system testing frequency can satisfy fully＜0.1% target, its frequency test precision is better than ATS system testing precision, amplitude error also is better than 1%.
The storage effect test
Owing to have integral relation between acceleration, speed and the displacement, so the computational accuracy of speed and displacement signal depends on the precision (amplitude-frequency precision) of acceleration signal.In above-mentioned test, provided the amplitude-frequency precision of acceleration signal, be reference value so can set the amplitude-frequency of signal for faster, and provide standard value, adopted time-domain integration method and Frequency Domain Integration method to provide measured value then respectively by Theoretical Calculation.Usually displacement measurement is used for the occasion of low-frequency vibration more, has therefore only got the signal of frequency less than 200Hz in test, and its test data is as follows:
Integration test result deck watch
Can find that by last table the data and the theoretical value that adopt the software integral method to obtain are more approaching, and the precision of Frequency Domain Integration method is a little more than the time-domain integration method, in the Signal Processing process, also avoided the problem of baseline correction, therefore in the utility model, final integral algorithm has still been selected the Frequency Domain Integration method for use.
The degree of distortion test
Degree of distortion is used for investigating the size that system under test (SUT) is introduced nonlinear distortion, needs the system that obtains to introduce the size of humorous wave amplitude in calculating.Harmonic distortion is the amplitude of harmonic component and the ratio of fundamental voltage amplitude.The computing formula of total harmonic distortion is as follows
A wherein
1Be the amplitude of first-harmonic, A
2... A
nRepresent the amplitude of nth harmonic.Below we by testing the validity that test is described.
| Signal frequency | Standard distortion degree (%) | The utility model system testing value (%) | ATS system testing value |
| 20 | 0.36 | 0.38 | 0.376 |
| 80 | 0.36 | 0.38 | 0.376 |
| 160 | 0.36 | 0.37 | 0.377 |
| 400 | 0.36 | 0.38 | 0.378 |
Claims (5)
1. virtual oscillating table checkout equipment, it is characterized in that comprising acceleration transducer, signal condition equipment, data collecting card and computing machine, the said equipment connects successively, described signal condition equipment and data collecting card are installed in independently and form the external hanging type data collector in the housing, are connected with computing machine by USB interface.
2. virtual oscillating table checkout equipment according to claim 1 is characterized in that described acceleration transducer comprises a three-dimensional acceleration transducer and at least four unidirectional acceleration transducers.
3. virtual oscillating table checkout equipment according to claim 1 is characterized in that described acceleration transducer is a piezoelectric acceleration transducer.
4. virtual oscillating table checkout equipment according to claim 1 is characterized in that described signal condition equipment adopts charge amplifier and contains the anti-aliasing filtering module.
5. virtual oscillating table checkout equipment according to claim 1 is characterized in that computing machine is connected with signal condition equipment by serial ports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200544222U CN201047798Y (en) | 2007-07-20 | 2007-07-20 | Virtual vibration table detecting apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200544222U CN201047798Y (en) | 2007-07-20 | 2007-07-20 | Virtual vibration table detecting apparatus |
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|---|---|
| CN201047798Y true CN201047798Y (en) | 2008-04-16 |
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| CNU2007200544222U Expired - Fee Related CN201047798Y (en) | 2007-07-20 | 2007-07-20 | Virtual vibration table detecting apparatus |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101819060A (en) * | 2010-04-23 | 2010-09-01 | 江阴众和电力仪表有限公司 | Vibration transducer |
| CN102829941A (en) * | 2012-08-16 | 2012-12-19 | 杭州亿恒科技有限公司 | Automated method for verifying vibration system |
| CN105318909A (en) * | 2015-05-28 | 2016-02-10 | 北京卫星环境工程研究所 | Health monitoring device of large-scale vibration table system |
| CN105372031A (en) * | 2015-11-20 | 2016-03-02 | 中国航空工业集团公司上海航空测控技术研究所 | PXI development platform-based aviation vibration table test system |
| CN105407345A (en) * | 2014-09-10 | 2016-03-16 | 宁波舜宇光电信息有限公司 | Jitter-proof technology detection system and method thereof |
| CN113008289A (en) * | 2021-02-26 | 2021-06-22 | 深圳市华图测控系统有限公司 | Data acquisition paperless recorder based on Internet of things |
-
2007
- 2007-07-20 CN CNU2007200544222U patent/CN201047798Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101819060A (en) * | 2010-04-23 | 2010-09-01 | 江阴众和电力仪表有限公司 | Vibration transducer |
| CN102829941A (en) * | 2012-08-16 | 2012-12-19 | 杭州亿恒科技有限公司 | Automated method for verifying vibration system |
| CN102829941B (en) * | 2012-08-16 | 2016-02-24 | 杭州亿恒科技有限公司 | A kind of automatic mode of vibrational system calibrating |
| CN105407345A (en) * | 2014-09-10 | 2016-03-16 | 宁波舜宇光电信息有限公司 | Jitter-proof technology detection system and method thereof |
| CN105407345B (en) * | 2014-09-10 | 2018-10-12 | 宁波舜宇光电信息有限公司 | A kind of stabilization technology detecting system and its method |
| CN105318909A (en) * | 2015-05-28 | 2016-02-10 | 北京卫星环境工程研究所 | Health monitoring device of large-scale vibration table system |
| CN105318909B (en) * | 2015-05-28 | 2018-06-22 | 北京卫星环境工程研究所 | Large vibration table system health monitoring device |
| CN105372031A (en) * | 2015-11-20 | 2016-03-02 | 中国航空工业集团公司上海航空测控技术研究所 | PXI development platform-based aviation vibration table test system |
| CN113008289A (en) * | 2021-02-26 | 2021-06-22 | 深圳市华图测控系统有限公司 | Data acquisition paperless recorder based on Internet of things |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080416 Termination date: 20120720 |