Method for measuring separation of bending wave and torsional wave in structural bending combined vibration
A technology of bending torsion combination and bending wave, which is applied in the direction of measuring ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., to achieve the effect of simple steps and principles and strong operability
Active Publication Date: 2019-05-07
ZHEJIANG UNIV
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Problems solved by technology
However, in the existing technical methods in China, more are about the measurement and research of strain, displacement, pure bending, and pure torsion. As for the method that can separately study bending vibration and torsional vibration when the structure generates combined bending and torsional vibration, there is basically no method.
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[0033] Such as Figure 4 As shown, this implementation case is to use the fiber Bragg grating sensing system to study the transient experiment of the combined vibration separation of phononic crystal bending and torsion, including a set of innovatively designed displacement sensing device for self-detuning single fiber grating, which has a broadband light source, Single optical fiber sensor, oscilloscope, charge amplifier, phononic crystal made of 6061 pure aluminum beam, fixed support, piezoelectric film and some optical circulators, etc.
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The invention discloses a method for measuring separation of a bending wave and a torsional wave in structural bending combined vibration. The structure tends to bend and twist combined vibration whensubjected to steady state, transient or random offset-launched. It is very difficult to measure the frequency response of bending or torsional vibration alone when testing the vibration of the structure. According to the method for measuring the separation of the bending wave and the torsional wave in the structural bending combined vibration, two measuring points whose connecting line passes thegeometric center of normal section and which are symmetrical about the geometric center are selected on the normal section of the measurement position of the tested structure, bending vibration response signals and torsional vibration response signals can be obtained respectively by simply adding and subtracting the displacement response signals detected at the two points, separation of bending waves and torsional waves is achieved, and therefore structural bending combined vibration mode is better analyzed.
Description
technical field [0001] The invention belongs to the field of mechanical vibration measurement, in particular to a method for measuring the separation of bending waves and torsional waves in the combined bending and torsional vibration of a symmetrical cross-section structure. Background technique [0002] Modal analysis is a modern method to study the dynamic characteristics of structures, and it is the application of system identification method in the field of engineering vibration. Modes are the natural vibration characteristics of mechanical structures, and each mode has a specific natural frequency, damping ratio, and mode shape. Vibration modes are an inherent, integral property of elastic structures. By using the modal analysis method to understand the main modal characteristics of each order of the structure in a certain susceptible frequency domain range, it is possible to predict the actual vibration response of the structure under the action of various external o...
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IPC IPC(8): G01H17/00
Inventor 庄国志袁志文吕旭峰王宇涵王丹凤
Owner ZHEJIANG UNIV
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