CN203941068U - A kind of suspension electric magnetization resonant mode fatigue experimental device - Google Patents
A kind of suspension electric magnetization resonant mode fatigue experimental device Download PDFInfo
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- CN203941068U CN203941068U CN201420223253.0U CN201420223253U CN203941068U CN 203941068 U CN203941068 U CN 203941068U CN 201420223253 U CN201420223253 U CN 201420223253U CN 203941068 U CN203941068 U CN 203941068U
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Abstract
The utility model discloses a kind of suspension electric magnetization resonant mode fatigue experimental device.Electro-hydraulic servo formula testing machine test frequency is low, and the noise of electromagnetic type fatigue tester is large.In the utility model, the bottom of two test specimen clamping limbs is fixed with a permanent magnetism can respectively; The inside of two permanent magnetism cans is equipped with permanent magnet; Two acceleration transducers are separately fixed at the lateral wall of two permanent magnetism cans, and two power sensors are fixed with an electromagnet respectively; The signal input part of the signal output part access in parallel signal picker of two acceleration transducers and two power sensors; Signal picker connects host computer by USB mouth, and host computer exports signal generator to by USB mouth; Signal generator generates modulated-analog signal, passes to the input end of power amplifier; The positive current output terminal of power amplifier is connected with the current input terminal of an electromagnet, and negative-phase sequence curent output terminal is connected with the current input terminal of another electromagnet.The utility model noise is little, precision is high.
Description
Technical field
The utility model belongs to torture test technical field, relates to fatigue experimental device, is specifically related to a kind of suspension electric magnetization resonant mode fatigue experimental device.
Background technology
Fatigue reliability is the important parameter of weighing all kinds of dynamoelectric equipment qualities.The design of fatigue reliability needs the anti-fatigue performance of Knowing material or force structure, and torture test is at present the Main Means that obtains material or Anti-Fatigue performance.
The key technical indexes of fatigue tester comprises test load precision, test frequency etc.At present, fatigue tester mainly contains three kinds of pure mechanical load formula, electro-hydraulic servo loaded type and electromagnetism loaded types etc., there is the deficiencies such as complex structure, precision is low, automaticity is low in the pure mechanical load method occurring the earliest, is replaced gradually by the higher electro-hydraulic servo formula of automaticity and electromagnetism loaded type.Wherein electro-hydraulic servo formula testing machine precision is high, but test frequency is lower.The test frequency of electromagnetic type fatigue tester is high, but noise is large, and precision is lower slightly.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, and a kind of suspension electric magnetization resonant mode fatigue experimental device is provided, and noise is little, frequency is high, precision is high, energy consumption is low.
The utility model comprises test specimen clamping limb, permanent magnetism can, permanent magnet, electromagnet and control system.The bottom of described two test specimen clamping limbs is fixed with a permanent magnetism can respectively; The inside of two permanent magnetism cans is equipped with permanent magnet; Two blocks of described electromagnet be separately positioned on two permanent magnetism cans under.
Described control system comprises acceleration transducer, power sensor, signal picker, host computer, signal generator and power amplifier.Two described acceleration transducers are separately fixed at the lateral wall of two permanent magnetism cans, and the top of two power sensors is fixed with the bottom of an electromagnet respectively; The signal input part of the signal output part access in parallel signal picker of described two acceleration transducers and two power sensors; Signal picker is by USB mouth access host computer, and host computer exports signal generator to by USB mouth; The instruction that signal generator is sent according to host computer and parameter generate modulated-analog signal, pass to the input end of power amplifier; Described modulated-analog signal comprises positive phase current signal and negative-phase sequence curent signal; The positive current output terminal of power amplifier is connected with the current input terminal of an electromagnet, and negative-phase sequence curent output terminal is connected with the current input terminal of another electromagnet.
The material of described test specimen clamping limb is alloy steel, and the material of permanent magnetism can is aluminium alloy.
The bottom of described permanent magnetism can is fixed with bottom, and permanent magnet is arranged on bottom.The top sidewall of described test specimen clamping limb offers test specimen mounting hole, and top end face offers hoist cable and stretches into groove and test specimen clamp screw pit; The xsect of described test specimen mounting hole is square; The bottom that described hoist cable stretches into groove and test specimen clamp screw pit all connects with the hole wall of test specimen mounting hole.
The beneficial effect the utlity model has is:
The utility model utilizes bending (torsion) resonance principle, loads by suspension electric magnetization mode.Compared with traditional electromagnetism loaded type fatigue tester, remove loading force push rod, adopt the push-and-pull action between electromagnet and permanent magnet to load, it is a kind of contactless loading, thereby system noise is little, energy consumption is low, and loading force can not be subject to the interference of partial structurtes distortion and vibration, loading force is more prone to control, and can improve largely the precision of test.
Brief description of the drawings
Fig. 1 is principle of work schematic diagram of the present utility model;
Fig. 2 is the structural representation of control system in the utility model;
Fig. 3 is the overall assembling stereogram of test specimen clamping limb and permanent magnetism can and test specimen in the utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, a kind of suspension electric magnetization resonant mode fatigue experimental device, comprises test specimen clamping limb 1, permanent magnetism can 2, permanent magnet 3, electromagnet 4 and control system.The bottom of two test specimen clamping limbs 1 is fixing with a permanent magnetism can 2 respectively; The inside of two permanent magnetism cans 2 is equipped with permanent magnet 3; Two blocks of electromagnet 4 be separately positioned on two permanent magnetism cans 2 under.The material of test specimen clamping limb 1 is alloy steel, and the material of permanent magnetism can 2 is aluminium alloy.
As shown in Figure 2, control system comprises acceleration transducer 5, power sensor 6, signal picker 9, host computer 10, signal generator 11 and power amplifier 12.Two acceleration transducers 5 are separately fixed at the lateral wall of two permanent magnetism cans 2, and the top of two power sensors 6 is fixed with the bottom of an electromagnet 4 respectively; The signal input part of the signal output part access in parallel signal picker 9 of two acceleration transducers 5 and two power sensors 6; Signal picker 9 is by USB mouth access host computer 10, and host computer 10 exports signal generator 11 to by USB mouth; The instruction that signal generator 11 is sent according to host computer and parameter generate modulated-analog signal, pass to the input end of power amplifier 12; Modulated-analog signal comprises positive phase current signal and negative-phase sequence curent signal; The positive current output terminal of power amplifier 12 is connected with the current input terminal of an electromagnet 4, and negative-phase sequence curent output terminal is connected with the current input terminal of another electromagnet 4.
As shown in Figure 3, the bottom of permanent magnetism can 2 is fixed with bottom 2-1, and permanent magnet 3 is arranged on bottom 2-1.The top sidewall of test specimen clamping limb 1 offers test specimen mounting hole 1-1, and top end face offers hoist cable and stretches into groove 1-2 and test specimen clamp screw pit 1-3; The xsect of test specimen mounting hole 1-1 is square; The bottom that hoist cable stretches into groove 1-2 and test specimen clamp screw pit 1-3 all connects with the hole wall of test specimen mounting hole 1-1.
The principle of work of this suspension electric magnetization resonant mode fatigue experimental device:
The two ends of test specimen 7 embed respectively in the test specimen mounting hole 1-1 of two test specimen clamping limbs, in the test specimen clamp screw pit 1-3 of two test specimen clamping limbs, holding screw are all set, and holding screw compresses test specimen 7; Article two, the hoist cable that corresponding test specimen clamping limb is stretched into respectively in the bottom of hoist cable 8 stretches in groove 1-2, and fixes with one end of test specimen 7 respectively; Article two, the top of hoist cable 8 is all fixed with frame.
Control system adopts closed-loop control, signal picker 9 gathers the acceleration of acceleration transducer 5 and the exciting force of power sensor 6, obtain feedback signal, host computer 10 is modulated load signal according to testing requirements and feedback signal, and by signal generator 11, signal is exported, then access two blocks of electromagnet 4 by power amplifier 12.
In electromagnet 4, pass into the exchange current after power amplifier 12 amplifies, make to produce push-and-pull action between itself and permanent magnet 3, thereby to the resonant body generation exciting force jointly being formed by test specimen clamping limb 1 and test specimen 7.Under this exciting, resonant body produces and is forced to resonance, and test specimen is subject to being enough to cause the dynamic load effect of fatigue break.The frequency, the direction and intensity that utilize acceleration feedback and exciting force to feed back exchange current are modulated, and realize closed-loop control.This test unit can be realized bending, reverse two kinds of load modes, can realize sinusoidal signal loading and combined waveform and load, and can realize constant load and variable load and load.
The resonator system dynamics of this suspension electric magnetization resonant mode fatigue experimental device obtains:
Test specimen clamping limb 1 rigidity is much larger than specimen stiffness, and the inertia of system mainly concentrates on two test specimen clamping limbs 1, therefore under the prerequisite that meets requirement of engineering precision, resonator system can be approximately to the model of vibration of two degrees of freedom one rigidity, the transport function of resonator system can be obtained analytic solution, damping parameter required in transport function can, by frequency sweep at intermittence, according to frequency sweep response spectrum figure characteristic, utilize half-power method to calculate.Swept frequency excitation strength control, at reduced levels, is guaranteed can not produce extra fatigue damage to test specimen.
The attainable major function of this suspension electric magnetization resonant mode fatigue experimental device is as follows:
1, exciting: pass into the exchange current of modulating, amplifying through power amplifier 12 by host computer 10 in electromagnet 4, make generation between electromagnet 4 and permanent magnet 3 be modulated the alternation push-and-pull action of signal controlling, the electric current of two blocks of electromagnet 4 is anti-phase each other, acts on the alternate load of test specimen 7 with superimposed.
2, load control: the vibration acceleration to test specimen clamping limb 1 in process of the test and exciting force carry out Real-Time Monitoring.Obtain the dynamics of the resonator system jointly being formed by test specimen 7 and test specimen clamping limb 1 by system dynamic modeling analysis and frequency sweep test.Taking actual measurement vibration acceleration, exciting force and system dynamics parameter as basis, the load that test specimen in process of the test is suffered is carried out to real-time analysis, modulate accordingly frequency, the direction and intensity of drive current, by the stress of testing requirements controlled loading power and test specimen.
3, the loading of combined waveform load: exciting force can be by modulating the direction of current that passes into electromagnet 4 and intensity.According to the dynamics of resonator system, by calculating in real time the time dependent rule of electric current corresponding to combined waveform load, and inputed to driver, realize combined waveform and load.
4, the realization of bending, torsional fatigue test: when repeated bend test, two block permanent magnets 3 are placed on the both sides of test specimen 7; When torsional fatigue test, two block permanent magnets 3 are placed on the front and back position of test specimen 7.
The volume of this suspension electric magnetization resonant mode fatigue experimental device is little, noise is low, it is low to consume energy, test accuracy is high, test frequency is high, easy to operate.
Claims (3)
1. a suspension electric magnetization resonant mode fatigue experimental device, comprises test specimen clamping limb, permanent magnetism can, permanent magnet, electromagnet and control system, it is characterized in that:
The bottom of described two test specimen clamping limbs is fixed with a permanent magnetism can respectively; The inside of two permanent magnetism cans is equipped with permanent magnet; Two blocks of described electromagnet be separately positioned on two permanent magnetism cans under;
Described control system comprises acceleration transducer, power sensor, signal picker, host computer, signal generator and power amplifier; Two described acceleration transducers are separately fixed at the lateral wall of two permanent magnetism cans, and the top of two power sensors is fixed with the bottom of an electromagnet respectively; The signal input part of the signal output part access in parallel signal picker of described two acceleration transducers and two power sensors; Signal picker is by USB mouth access host computer, and host computer exports signal generator to by USB mouth; The instruction that signal generator is sent according to host computer and parameter generate modulated-analog signal, pass to the input end of power amplifier; Described modulated-analog signal comprises positive phase current signal and negative-phase sequence curent signal; The positive current output terminal of power amplifier is connected with the current input terminal of an electromagnet, and negative-phase sequence curent output terminal is connected with the current input terminal of another electromagnet.
2. a kind of suspension electric magnetization resonant mode fatigue experimental device according to claim 1, is characterized in that: the material of described test specimen clamping limb is alloy steel, and the material of permanent magnetism can is aluminium alloy.
3. a kind of suspension electric magnetization resonant mode fatigue experimental device according to claim 1, is characterized in that: the bottom of described permanent magnetism can is fixed with bottom, and permanent magnet is arranged on bottom; The top sidewall of described test specimen clamping limb offers test specimen mounting hole, and top end face offers hoist cable and stretches into groove and test specimen clamp screw pit; The xsect of described test specimen mounting hole is square; The bottom that described hoist cable stretches into groove and test specimen clamp screw pit all connects with the hole wall of test specimen mounting hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420223253.0U CN203941068U (en) | 2014-04-30 | 2014-04-30 | A kind of suspension electric magnetization resonant mode fatigue experimental device |
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| CN201420223253.0U CN203941068U (en) | 2014-04-30 | 2014-04-30 | A kind of suspension electric magnetization resonant mode fatigue experimental device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105258784A (en) * | 2015-11-04 | 2016-01-20 | 北京工业大学 | Automatic pulse excitation modal parameter identification method and device |
| CN106525464A (en) * | 2016-12-30 | 2017-03-22 | 宁波建新底盘系统有限公司 | Automobile torsion beam back bridge fatigue test device |
| CN111932997A (en) * | 2020-08-07 | 2020-11-13 | 重庆同纳科技发展有限责任公司 | Teaching aid |
-
2014
- 2014-04-30 CN CN201420223253.0U patent/CN203941068U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105258784A (en) * | 2015-11-04 | 2016-01-20 | 北京工业大学 | Automatic pulse excitation modal parameter identification method and device |
| CN105258784B (en) * | 2015-11-04 | 2018-11-02 | 北京工业大学 | A kind of autompulse excitation Modal Parameters Identification and device |
| CN106525464A (en) * | 2016-12-30 | 2017-03-22 | 宁波建新底盘系统有限公司 | Automobile torsion beam back bridge fatigue test device |
| CN106525464B (en) * | 2016-12-30 | 2019-12-10 | 宁波建新底盘系统有限公司 | Automobile torsion beam type rear axle fatigue test device |
| CN111932997A (en) * | 2020-08-07 | 2020-11-13 | 重庆同纳科技发展有限责任公司 | Teaching aid |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141112 Termination date: 20160430 |