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Device and method for performing modal testing on inflatable flexible film structure based on hammering excitation method

A hammer excitation method, flexible film technology, applied in measuring devices, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, using sound waves/ultrasonic waves/infrasonic waves for material analysis, etc., can solve the problem of limited experimental research and no inflatable flexible films structure, it is difficult to verify the credibility and accuracy of numerical simulation research results, etc., to achieve the effect of improving accuracy, convenient use of test methods, and simple structure

Inactive Publication Date: 2016-03-23
BEIHANG UNIV +2
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AI Technical Summary

Problems solved by technology

However, the experimental research on the modal analysis of the inflatable flexible membrane structure is still very limited, and it is difficult to verify the credibility and accuracy of the numerical simulation results. Simple, efficient and easy-to-operate test setup and test method

Method used

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  • Device and method for performing modal testing on inflatable flexible film structure based on hammering excitation method
  • Device and method for performing modal testing on inflatable flexible film structure based on hammering excitation method
  • Device and method for performing modal testing on inflatable flexible film structure based on hammering excitation method

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Embodiment Construction

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0049] The present invention is a kind of modal experiment testing device of the inflatable flexible film structure based on hammering excitation method, such as figure 1 As shown, it includes structural modal test system 5, structural dynamics test system (hammer and force sensor 1, acceleration sensor 2), inflatable pressure measurement system (air pump 8, micromanometer 7), test computer 6, inflatable flexible Thin film structure 3, charge amplifier 4.

[0050] Such as figure 2As shown, the structural modal test system includes a signal acquisition analyzer, a main box with a SCSI interface, an ICP modulation input module, an A / D converter, a DSP data processor, a signal source output module, and an accelerometer calibrator.

[0051] Such as image 3 As shown, the piezoelectric acceleration sensor device connected by wires, in which the acceleration se...

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Abstract

The invention discloses a device and method for performing modal testing on an inflatable flexible film structure based on a hammering excitation method. A force hammer is used for knocking a marked excitation point of the inflatable flexible film structure so as to apply vibrational excitation, a force sensor installed on the force hammer receives force signals, and an acceleration sensor installed on the surface of the inflatable flexible film structure receives acceleration signals; after the force signals and the acceleration signals are amplified by a charge amplifier, a data acquisition instrument inputs received acceleration electrical signals and force electrical signals into a computer, the computer performs digital-to-analogue conversion on the signals and obtains a frequency response function matrix according to the force signals and the acceleration signals, and finally modal vibration shapes of all orders and related modal parameters of the structure are obtained through parameter identification. Thus, modal numerical simulation of the inflatable flexible film structure can be verified and provided with reference. The device is simple in structure, convenient to operate and wide in application range.

Description

technical field [0001] The present invention is applicable to the test and analysis of the modal characteristics of the inflatable flexible film structure, specifically a test device and a test method for measuring the modal mode shape, corresponding vibration frequency and modal damping of the inflatable flexible film structure by means of a hammer excitation method, It is used to study the vibration characteristics of the above structure, and can be used to guide and verify the finite element numerical simulation analysis of the above structure. Background technique [0002] In recent years, airships have become the focus of current research in various countries in the world by virtue of their extensive application prospects in civil and military fields. As an early warning and over-the-horizon flight platform, it has advantages that other aircraft cannot match. During the Gulf War, the United States first discovered Iraq's military operations against Kuwait through the s...

Claims

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Application Information

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IPC IPC(8): G01N29/04
CPCG01N29/045
Inventor 仇翯辰邱志平汪俊王晓军王喜鹤何巍
Owner BEIHANG UNIV
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