A Suspension Electromagnetic Excitation Resonant Fatigue Test Method
A fatigue test and electromagnetic excitation technology, which is applied in the field of fatigue test, can solve the problems of high test frequency, low precision, and large noise, and achieve the effects of low energy consumption, low system noise, and improved accuracy
Inactive Publication Date: 2016-07-13
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology
The test frequency of the electromagnetic fatigue test method is high, but the noise is large and the accuracy is slightly low
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[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0022] like figure 1 As shown, the device used in a suspension electromagnetic excitation resonant fatigue test method includes a specimen clamping arm 1, a permanent magnet box 2, a permanent magnet 3, an electromagnet 4 and a control system. The bottoms of the two specimen clamping arms 1 are respectively fixed with a permanent magnet box 2; permanent magnets 3 are arranged inside the two permanent magnet boxes 2; below. The material of the specimen clamping arm 1 is alloy steel, and the material of the permanent magnet box 2 is aluminum alloy.
[0023] like figure 2 As shown, the control system includes an acceleration sensor 5 , a force sensor 6 , a signal collector 9 , a host computer 10 , a signal generator 11 and a power amplifier 12 . Two acceleration sensors 5 are respectively fixed on the outer walls of the two permanent magnet boxes 2, a...
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The invention discloses a suspension electromagnetic incentive resonant type fatigue test method. An electro-hydraulic servo type test method has low test frequency, and an electromagnetic type fatigue test method has large noise. The suspension electromagnetic incentive resonant type test method comprises the following specific steps: two specimen clamping arms are hanged on a machine frame by slings, and two ends of a specimen are respectively fixed on the two specimen clamping arms; according to a specimen material and geometrical shape parameters, dynamic calculation is carried out by using two-degree-of-freedom analytical model of a resonant system, and an estimation value of a resonance angular frequency is obtained; a frequency scanning test is carried out, a precise resonance angular frequency rho of the resonant system is obtained, and at the same time by using a half power point method, a damping ratio xi of the system is obtained; according to the frequency scanning test result and test bending moment requirements, fatigue tests are carried out; after each 200000-250000 times of the fatigue tests are carried out, the frequency scanning test is repeated, when the obtained resonance angular frequency of the resonant system is decreased by 5-8% compared with a resonance angular frequency of an initial state rho, the specimen is affirmed to be failed, and the test is completed. The fatigue test method is low in noise, high in frequency and high in precision.
Description
technical field [0001] The invention belongs to the technical field of fatigue tests, and relates to a fatigue test method, in particular to a suspension electromagnetic excitation resonance type fatigue test method. Background technique [0002] Fatigue reliability is an important parameter to measure the quality of various electromechanical equipment. The design of fatigue reliability needs to know the anti-fatigue performance of materials or stressed structures. At present, fatigue test is the main means to obtain the anti-fatigue performance of materials or structures. [0003] The main technical indicators of the fatigue testing machine include test load accuracy, test frequency, etc. At present, there are mainly three types of fatigue testing machines: pure mechanical loading type, electro-hydraulic servo loading type and electromagnetic loading type. The earliest pure mechanical loading method has shortcomings such as complex structure, low precision, and low degree ...
Claims
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IPC IPC(8): G01N3/02G01N3/38
Inventor 周迅陈大为杨柳青胡明陈文华
Owner ZHEJIANG SCI-TECH UNIV