A Control Method of Variable Frequency Loading in Damage Tolerance Test

Abstract

The invention belongs to aircraft test measurement and control technology, and relates to a damage tolerance test frequency conversion loading control method. Set the maximum loading frequency, minimum loading frequency and reference loading frequency according to the requirements of the damage tolerance test and the material characteristics of the test piece, set the maximum load force according to the load spectrum of the damage tolerance test, and determine the number of loading times and the final load value of each loading; Adjust the frequency of load application according to the difference between two adjacent final load values ​​with the formula fn=Lmax / |Ln-Ln+1|*fb. The invention loads the damage tolerance test in a frequency conversion manner, completely solves the problem that the test period is too long due to a single frequency test, shortens the test period, saves test resources, and improves test efficiency. The load spectrum of the test is different, and the test efficiency is increased by more than 2 times on average to solve the problem of difficult control of the tension and compression load in the damage tolerance test.

Description

A frequency-frequency loading control method for damage tolerance test Technical field The invention belongs to aircraft test measurement and control technology, and relates to a damage tolerance test variable frequency loading control method. Background technique At present, damage tolerance test systems at home and abroad can only perform tests at a single frequency set in advance during test loading. However, in the damage tolerance test, the load values ​​in the test load spectrum are quite different and many of the final values ​​are tension-compression interactions. Variable load, if all load values ​​are applied at the same frequency, the test frequency will be low due to the existence of alternating loads, and the cycle of each test is very long. If the frequency of each final load value is set manually, due to the damage tolerance of aircraft components The number of final loads in the test reached one million, which was difficult to achieve in operation. Summary of ...

AI Technical Summary

Problems solved by technology

The present invention has the advantages and beneficial effects. The present invention loads the damage tolerance test in a frequency conversion manner, which completely solves the problem of too long test period caused by testing according to a single frequency, shortens the test period, and saves test resources. , improve the test efficiency, because the load spectrum of each test is different, the test efficiency is increased by more than 2 times on average to solve the problem of difficult control of tension and compression loads in damage tolerance tests