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Hydraulic pulse excitation device for experimental investigation on dynamic characteristics of structure

A technology of dynamic characteristics and hydraulic pulses, which is applied in fluid pressure actuation devices, testing of machine/structural components, measuring devices, etc., can solve the problem of wrong measurement results, accurate testing of dynamic characteristics of underwater structures, and inability to excite structures with rich structures Modal and other problems, to achieve the effect of good repeatability

Inactive Publication Date: 2014-02-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: when using the pulse excitation method to measure the dynamic characteristics of the structure, when the structure is struck with a force hammer, the repeatability of the position of the force point, the magnitude of the force and the direction of the force is low, and when the structure is relatively large When it is too large, it may not be possible to excite the rich modes of the structure by hammering, thus causing errors in the measurement results; in addition, there is currently no device for accurately testing the dynamic characteristics of underwater structures

Method used

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  • Hydraulic pulse excitation device for experimental investigation on dynamic characteristics of structure
  • Hydraulic pulse excitation device for experimental investigation on dynamic characteristics of structure
  • Hydraulic pulse excitation device for experimental investigation on dynamic characteristics of structure

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Embodiment Construction

[0017] Describe the present invention below in conjunction with specific embodiment:

[0018] In this embodiment, the hydraulic pulse excitation device proposed by the present invention is used to carry out excitation tests on the bare panel in the air environment and underwater environment, and the change of the structural loss factor of the bare panel with frequency in different environments is measured.

[0019] Refer to attached figure 1 , The hydraulic pulse excitation device in this embodiment includes a base plate 1, a pulse excitation assembly and a switch assembly.

[0020] The pulse excitation assembly includes an impact shaft 2 , a sleeve 6 , an excitation spring 8 , an excitation hydraulic cylinder 12 and a connecting piece 9 . The excitation spring 8 is coaxially placed in the sleeve 6; the middle part of the impact shaft 2 has an annular protrusion, and the impact shaft extends into one end of the sleeve 6, and the middle part of the impact shaft is fixedly conn...

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Abstract

The invention discloses a hydraulic pulse excitation device for experimental investigation on dynamic characteristics of a structure. The hydraulic pulse excitation device comprises a bottom plate, a pulse excitation component and a switch component, wherein the pulse excitation component comprises an impacting shaft, a sleeve, an excitation spring, an excitation hydraulic cylinder and a connector; the switch component comprises a switch hydraulic cylinder, a switch driving lever and a switch resetting mechanism; the excitation spring drives the impacting shaft to generate an impact force, and the switch resetting mechanism is used for locking and releasing the impacting shaft. In the hydraulic pulse excitation device, the hydraulic cylinder is used as an excitation driving mechanism, the hydraulic cylinder has a sealing function, so that the hydraulic pulse excitation device can respectively execute pulse excitation on the structure in air and under water, thereby realizing experiment and measurement of the dynamic characteristics of the structure in air and under water; by regulating the amount of compression of the excitation spring, the hydraulic pulse excitation device can accurately control the size of the excitation force used when pulse excitation is applied to the structure, and excellent repeatable accuracy is obtained in aspects of the origin of force of excitation and the excitation force direction.

Description

technical field [0001] The invention relates to the technical field of dynamic testing of mechanical structures, in particular to a hydraulic pulse excitation device for structural dynamic characteristic test research. Background technique [0002] The experimental research on the dynamic characteristics of structures is mainly divided into two types: one is to measure the corresponding dynamic characteristics of the structure under steady-state excitation conditions; the other is to obtain the corresponding dynamic characteristics of the structure through measurement under transient excitation conditions. To measure the dynamic characteristics of structures under transient excitation conditions, the method commonly used at present is the pulse excitation method. In the pulse excitation method, pulse excitation is often applied to the structure by hammering. In the test measurement, it is necessary to tap multiple times under the same conditions in order to reduce the error...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M99/00F15B21/12
Inventor 王敏庆张教超李海飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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