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Experiment system and verification method for gap nonlinear rigidity recognition

An experimental system and nonlinear technology, applied in the testing, measuring devices, instruments, etc. of machine/structural components, etc., can solve the problems that the gap cannot be adjusted continuously, cannot accurately provide nonlinear stiffness characteristics, and does not have zero stiffness characteristics, etc. The effect of precise and measurable gap size

Active Publication Date: 2018-07-31
TIANJIN UNIV
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Problems solved by technology

However, the existing test bench cannot accurately provide the nonlinear stiffness characteristics of the structure under real working conditions, does not have zero stiffness characteristics, and the gap cannot be continuously adjusted, which cannot meet the experimental verification requirements of the gap nonlinear stiffness identification method

Method used

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  • Experiment system and verification method for gap nonlinear rigidity recognition
  • Experiment system and verification method for gap nonlinear rigidity recognition
  • Experiment system and verification method for gap nonlinear rigidity recognition

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Embodiment Construction

[0028] In order to better illustrate the purpose and advantages of the present invention, the specific implementation of the present invention will be described below through specific examples and in conjunction with the accompanying drawings.

[0029] In the specific embodiment of the present invention, the experimental system for gap nonlinear stiffness identification is as follows: figure 1 shown. The test system includes a gap structure, an excitation system (that is, a force hammer 4), a force sensor 1, an acceleration sensor 2, a speed and displacement sensor 3, and a measurement and analysis system 5. The structure diagram of the gap structure is as follows: figure 2 As shown, the gap structure includes a simply supported beam 7, a fixed shaft 8, a seated bearing 9, a limit bolt 10 and a supporting platform 11, and the simply supported beam 7 is made of 600×50×5.6mm (length×width×height) steel The fixed shaft 8 is cut into a groove by wire cutting, the simply supporte...

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Abstract

The invention discloses an experiment system and verification method for gap nonlinear rigidity recognition, and the method comprises the steps: building a linear / nonlinear experiment system which hasnear-zero rigidity and allows a gap to be continuously adjusted; carrying out the linear vibration experiment under the condition that the experiment system does not contain the gap features, and measuring a response signal of a system under the given excitation condition; carrying out the nonlinear vibration experiment under the condition that the experiment system contains the gap features, andmeasuring the response signal of the system under the given excitation condition; recognizing the nonlinear vibration experiment measurement data through a to-be-verified gap nonlinear rigidity recognition method, taking a gap quantity measured actually and the recognized rigidity features obtained through the linear vibration experiment as the references, comparing the recognized rigidity features obtained through the nonlinear vibration experiment with the references, and verifying the feasibility and accuracy of the gap nonlinear rigidity recognition method.

Description

technical field [0001] The invention belongs to the technical field of nonlinear system identification, and in particular relates to an experimental system and verification method for gap nonlinear stiffness identification. Background technique [0002] Due to factors such as out-of-tolerance in the processing and production process, assembly errors and use wear, there will inevitably be gaps in mechanical equipment and structural systems. Gap nonlinearity is a relatively common concentrated structural nonlinearity. Its existence will change the stiffness characteristics of the structure, especially for equipment operating at high altitudes. For example, due to the wear and tear of the process and use, there is inevitably a gap in the aircraft control surface system. The non-linearity of this gap may cause the limit cycle oscillation of the structure, which poses a major hidden danger to flight safety. In order to save space to the greatest extent in storage and transportat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/00G01M7/08
CPCG01M7/00G01M7/08Y02E30/30
Inventor 马志赛丁千王博尹强
Owner TIANJIN UNIV
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