A Trial Spectrum Clipping Method to Realize Uniaxial and Triaxial Random Vibration Stress Equivalent

Abstract

The invention discloses a test spectrum clipping method achieving monaxial and triaxial random vibration stress equivalence, and the problem that an existing test spectrum determination technique is complex in processing process is mainly solved. The test spectrum clipping method comprises the implementation steps that 1, a maximum Fann equivalent stress value sigmamax, generated when single axes are sequentially loaded with a homotaxial vibration acceleration test spectrum, of a focused point n on a vibration system and a Fann equivalent stress value sigmaxyz, generated when the three axes are simultaneously loaded, of the focused point n are extracted, and the ratio a of sigmamax to sigmaxyz is calculated through a formula a=sigmamax / sigmaxyz; 2, the horizontal coordinate of the monaxial vibration acceleration test spectrum keeps invariable, the corresponding vertical coordinate is reduced by a<2> times of a, and then a clipped vibration acceleration test spectrum is obtained. The test spectrum clipping method can achieve the effect that the Fann equivalent stress value, generated during triaxial vibration, of the focused point n can be made to be equal to the maximum Fann equivalent stress value generated during monaxial sequential vibration, is a simple and convenient method for determining a triaxial vibration test spectrum and can be used for building a triaxial vibration test standard.

Description

technical field [0001] The invention belongs to the technical field of mechanical vibration, and in particular relates to a test spectrum clipping method, which can be used in triaxial vibration tests. Background technique [0002] Uniaxial random vibration test conditions generally come from test standards and specifications, but for the formulation of triaxial random vibration test conditions, there are currently no authoritative standards and specifications for reference. With the introduction of the triaxial vibration test bench, how to load the vibration system with a suitable triaxial vibration test spectrum on the triaxial vibration test bench is an urgent problem to be solved. [0003] Directly using the traditional uniaxial vibration test standard as the triaxial vibration test standard may lead to the problem that the products designed according to the traditional uniaxial vibration test standard will be damaged in the actual triaxial vibration test. The triaxial ...

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Problems solved by technology

[0003] Directly using the traditional uniaxial vibration test standard as the triaxial vibration test standard may lead to the problem that those products designed according to the traditional uniaxial vibration test standard will be damaged in the actual triaxial vibration test

The triaxial vibration test technology is complex, and its test cost is about 3 to 6 times that of the uniaxial vibration test, and the design efficiency of the triaxial vibration test scheme is low. Exploring the conditions of the triaxial vibration test through the thorough test is both risky and relatively large. the blindness of

The disadvantage of this method is: due to the great differences between different vibration systems, the test conditions given by the evaluation of engineering experience have a large blindness

The disadvantages of this method are: there are few samples of domestic air-to-air missile test measured data, especially less measured data of missile free flight, and the cost of obtaining data is very high, and the data processing and analysis process is complicated

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