Large-scale structure modal test method
A large-scale structure and modal testing technology, which is applied in the field of mechanical structure and vibration testing, can solve the problems of three-way sensor wiring harnesses, long preparation period, and susceptibility to interference, and achieve simple excitation, low cost, and reduced test time Effect
Pending Publication Date: 2022-04-22
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology
The traditional test method requires acquisition equipment with a large number of channels, and the cost is high; there are many three-way sensor wiring harnesses, which are susceptible to interference, and the experiment preparation period is also long
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[0036] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The schematic embodiments of the present invention and their descriptions are only used to explain the present invention and are not As a limitation of the present invention.
[0037] A kind of large-scale structural modal test method, its test system such as figure 1 As shown, the test system includes:
[0038] Smart Sensor Device1. The sensor device has a built-in three-axis acceleration sensor, inclinometer, GPS or Beidou positioning device, WiFi or Bluetooth or other forms of wireless connection devices. The smart sensor equipment has built-in related software, which can collect data from the sensor, preprocess the data, and send the sensor data to the wireless connection switch through the built-in wireless device according to the w...
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The invention provides a large-scale structure modal testing method, and belongs to the field of vibration testing. The method comprises the steps of sensor position optimization analysis, sensor equipment fixation, establishment of a relation between sensor position orientation and a geometric model, data acquisition and recording, data processing, modal parameter identification and the like. A sensor with a wireless transmission function is adopted for measurement, so that the experiment preparation time is shortened; the three-way micro-electro-mechanical acceleration sensor integrating an inclinometer and a positioning device is adopted, so that the cost is low, and the relation with a geometric model is conveniently established; and a step excitation method is adopted, so that the implementation difficulty is low.
Description
technical field [0001] The invention relates to a large-scale structure mode test method, which belongs to the field of mechanical structure and vibration test. Background technique [0002] Modal information consists of three elements: natural frequencies, modal damping ratios, and mode shapes. Modal information reflects the inherent vibration characteristics of the structure itself, and is an important index that must be considered in the design, processing and manufacturing of large structures. In actual engineering, in addition to the application of computer simulation technology, it is also an indispensable and important means to determine the mode of large-scale structures by means of experimental measurement. [0003] According to the different excitation forms, the modal test can be roughly divided into three forms: sine frequency sweep, pulse excitation, and step excitation. The sine frequency sweep is to excite the structure with a single frequency through a vibr...
Claims
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Login to View More IPC IPC(8): G01M99/00G01H17/00G08C17/02G06F17/16G06F30/10G06F30/23
CPCG01M99/004G01H17/00G08C17/02G06F30/23G06F30/10G06F17/16G06F2119/14
Inventor 周昊天张一凡王大为王京城杨丰福张亚林
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP