Method for determining load spectrum of auxiliary frame of mixing transport truck

Abstract

The invention discloses a method for determining a load spectrum of an auxiliary frame of a mixing transport truck. The method includes the steps that firstly, according to finite element analysis and a fatigue damage position of the auxiliary frame of the mixing transport truck in the actual use, a detecting position is determined, and static and road tests are carried out on the load spectrum; secondly, by combining speed and acceleration signals, power spectrum analysis and filtering processing are carried out on time domain data, singular points and the null shift are detected out and removed, and complete and reliable test data are obtained; thirdly, according to the actual working conditions of the mixing transport truck, combined work conditions of 'rapid feeding, full load transportation and rapid discharging' are adopted, and the load spectrum containing a set of feeding work condition data, one set of road test data (containing three road conditions) and one set of discharging work condition data is determined by combining the actual road test data. The method is simple, accurate and practical when used for testing and compiling the load spectrum of the auxiliary frame of the mixing transport truck, and provides a way and a data foundation for forecasting the fatigue life.

Description

technical field [0001] The invention relates to the field of load spectrum research, in particular to an analysis method for determining the load spectrum of the auxiliary frame of a mixer truck. Background technique [0002] With the acceleration of my country's urbanization process, cement concrete mixer trucks are widely used, and the demand is increasing day by day; in order to improve work efficiency, mixer trucks continue to be large-scale, and their rated loading capacity continues to increase. The cement mixer truck mainly transports concrete from the mixing station to the construction site safely, reliably and efficiently, and has the dual functions of transportation and stirring. Its sub-frame plays the role of connecting the chassis girder and supporting the mixing drum. It is mainly composed of the main beam, the front desk, the back plane and the rear wing. To balance the dynamic load, it must have sufficient strength, rigidity and durability. In actual use, i...

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Problems solved by technology

In the fields of aviation, automobiles, etc., the research on load spectrum has achieved certain results. In the field of aviation, the idea of ​​"fly-continue-fly" random fatigue load spectrum compilation has been proposed, as well as the fatigue load spectrum of aircraft landing gear; In the field of automobiles, someone compiled the bending-torsion composite load spectrum for the cutter shaft of the whole straw returning machine; someone compiled the fatigue load spectrum of the dump truck frame on the basis of dynamic operation tests; The transmission system, axle shaft and other components of engineering vehicles have carried out load signal testing, preprocessing and preparation of load spectrum of test bench; no one has studied the preparation method of load spectrum of mixer truck and sub-frame

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