Experimental verification method for identifying modal parameter of variable mass structure

A structural mode and parameter identification technology, which is applied in the testing of machines/structural components, measuring devices, and measuring ultrasonic/sonic/infrasonic waves, etc., can solve problems such as difficult to simulate signal measurement noise, and achieve accurate and reliable motion forms. control, a wide variety of effects
CN103226054BInactive Publication Date: 2015-07-01BEIJING INSTITUTE OF TECHNOLOGYGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING INSTITUTE OF TECHNOLOGYGY
Publication Date
2015-07-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to an experimental verification method for identifying a modal parameter of a variable mass structure, and belongs to the technical field of modal parameter identification of structural dynamics. The experimental verification method comprises the steps that a time varying structure with a mass size and mass distribution capable of be controlled accurately with a time varying rule is designed and set up; the modal parameter of the time varying structure is identified under short time invariant assumption; a varying rule of the modal parameter with the time of the time varying structure is obtained and serves as a basis reference; a time varying structure dynamic experiment is performed; a structural dynamic response signal of the time varying structure under specified excitation is measured; measured data is identified by a to-be-verified method; an identification result is compared with the basis reference for verifying the feasibility and the accuracy of the to-be-verified method; the identification result of the to-be-verified method and the basis reference are compared under different experiment conditions; and the robustness of the to-be-verified method is verified. The experimental verification method is simple and reliable.
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Description

technical field

[0001] The invention relates to an experimental verification method for modal parameter identification of a variable mass structure, and belongs to the technical field of structural dynamic modal parameter identification. Background technique

[0002] In engineering practice, the characteristics of structures change with time, and the time-invariant assumption is only a simplified treatment method for time-varying structures under given conditions. As the structural properties that researchers care about and the applications that use these properties continue to increase, especially in the fields of aerospace, machinery, bridges, etc., more and more structures whose time-varying properties cannot be ignored. For example, the total mass and mass distribution characteristics of the launch vehicle in flight change with time due to the continuous consumption of fuel; when the aircraft flies at super high speed, aerodynamic heating will cause the stiffness and dam...

Claims

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