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Indirect measurement method for rotation angle flexibility

A measurement method and dynamic flexibility technology, applied in the field of testing technology, can solve the problems of changing the dynamic characteristics of the structure, difficult to ensure the test accuracy, difficult to ensure the rigid connection between the structure to be tested and the T-shaped block, etc., to achieve operability. Strong and convenient field test effect

Inactive Publication Date: 2009-08-12
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, adding a T-shaped mass to the structure inevitably changes the dynamic characteristics of the structure, and it is difficult to ensure a completely rigid connection between the structure to be tested and the T-shaped mass
Therefore, this method is only suitable for measuring the angular dynamic compliance of large structures, and it is difficult to guarantee the test accuracy

Method used

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  • Indirect measurement method for rotation angle flexibility
  • Indirect measurement method for rotation angle flexibility
  • Indirect measurement method for rotation angle flexibility

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Embodiment Construction

[0013] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.

[0014] Such as figure 1 Shown is a copper tube fixed at one end with a wall thickness of 1mm and an outer diameter of 19.1mm. Assume that the dynamic compliance G from the concentrated moment to the corner at the point 3 to be measured is to be measured 3636 , G 3636 The first two subscripts in represent the position and direction of the response, and the last two subscripts represent the position and direction of the excitation.

[0015] (1) if figure 1 As shown, first arrange two measuring points near the point 3 to be measured, the distance between the measurin...

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Abstract

The invention relates to a method for indirectly measuring dynamic flexibility of a corner in the technical field of vibration test. The method comprises the following steps that: two more measuring points are arranged close to a point to be measured, and the three points are collinear and distributed in equal distance; a harmonic concentrated moment is replaced by a harmonic concentrated force system to express the corner into a linear combination of translational displacement based on the equivalence principle of the harmonic concentrated force system and a one-order three-point- numerical differentiation formula of the corner; and finally, the dynamic flexibility from the concentrated moment to the corner is expressed by the dynamic flexibility linearity from concentrated force to the translational displacement, and the corner flexibility can be indirectly measured by measuring the dynamic flexibility from the concentrated force to the translational displacement. The invention is an indirect measuring method which can construct the dynamic flexibility of the corner only by measuring a plurality of dynamic flexibilities from the concentrated force to the translational displacement by adopting a hamper test or a frequency sweep test without adding a mass block for the structure, applying the concentrated moment, nor even applying the balanced concentrated force system .

Description

technical field [0001] The invention relates to a method for testing the field of technical testing, in particular to an indirect measurement method for corner dynamic flexibility. Background technique [0002] Rotational dynamic compliance has important application value in the field of vibration analysis and vibration control. However, there is no portable and reliable angular displacement or angular acceleration sensor in engineering practice, and there is no good concentrated torque application method, which makes it possible to directly measure angular motion. Tenderness is very difficult. [0003] After searching the existing technical documents, it was found that Xu Qingyu and others published "Some Problems of Analytical Mode and Experimental Mode Synthesis Technology" in "Journal of Xi'an Jiaotong University" 1988, 22(4): 103-111. This paper introduces an indirect measurement technology of the static compliance of the corner. According to the equivalent principle o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L3/00
Inventor 董兴建孟光
Owner SHANGHAI JIAO TONG UNIV
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