Fatigue calculation method of car frame under effect of spatial rotation moment

A technology of rotational torque and calculation method, which is applied in the mechanical field and can solve problems such as the inability to solve frame fatigue

Active Publication Date: 2014-10-15
建新赵氏科技股份有限公司
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Problems solved by technology

[0005] At present, there is no systematic and perfect method for calculating the fatigue of the frame of engineering vehicles, especially under the load

Method used

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  • Fatigue calculation method of car frame under effect of spatial rotation moment
  • Fatigue calculation method of car frame under effect of spatial rotation moment
  • Fatigue calculation method of car frame under effect of spatial rotation moment

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the drawings and embodiments.

[0046] Such as figure 2 As shown, the fatigue calculation method of the frame under the action of the spatial turning moment provided by the present invention includes the following steps:

[0047] (1) Construct a finite element model of the frame structure, and perform a static solution for the frame according to the finite element model;

[0048] (2) Modify the load of the finite element model constructed in step (1), remove the space rotation moment load to retain the constant load, and distinguish the variable load from the constant load. The variable load is only the space rotation moment load;

[0049] (3) Re-solve the static force of the frame according to the modified finite element model in step (2);

[0050] (4). Compare the static solution result obtained in step (3) with the test result. If the error is within the allowable range, output the static solution resul...

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Abstract

The invention relates to a fatigue solving method of a car frame under the effect of spatial rotation moments. The method comprises the following steps that: a finite element model of a car frame structure under a permanent load is built, and a static solving result under the permanent load is output according to the finite element model; a moment load is exerted on the car frame, and translational constraints in three directions (X, Y and Z) are exerted in positions of support legs; under the condition that the support counter force in the three directions (X, Y and Z) in the positions of the support legs does not generate a negative value, the static solving result of change loads only including the moment load is output, and the static solving result is loaded into a fatigue solving work condition; and then, according to the rotating sequence of the space moment load, the car frame material attribution, a material processing method and a fatigue solving method, the car frame is subjected to fatigue cycle solving, and the fatigue service life and the load cycle amplitude are output. The fatigue solving method has the beneficial effects that the permanent load and the spatial rotation moment load are processed in different steps, so the fatigue solving result of the car frame under the condition of coexistence of the spatial rotation moment and the permanent load is obtained.

Description

Technical field [0001] The invention relates to the technical field of machinery, in particular to a fatigue calculation method of a vehicle frame under the action of a spatial turning moment. Background technique [0002] Cars have become an indispensable means of transportation for the development of modern society, and they play an important role in people's daily lives. The automobile industry has become a pillar industry for the development of my country's national economy with its powerful industrial pulling effect. [0003] As the carrier substrate of the car, the frame is generally composed of two longitudinal beams and several beams. Most parts and assemblies of the car, such as the engine, transmission system, suspension, steering, cab, cargo box and related operating mechanisms, The position is fixed by the frame. The function of the frame is to support various parts connected to the car, and to withstand various loads from inside and outside the car. When a car is dr...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 苏锦涛马利红褚建东王鲁斌黄年兵
Owner 建新赵氏科技股份有限公司
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