Method for improving geometric analysis contact search efficiency

A technology of isogeometric analysis and contact search, which is applied in the field of computer-aided engineering analysis, can solve problems such as affecting calculation, large workload of nonlinear iteration, and existence of iteration stability, so as to improve efficiency and stability, and ensure efficiency and stability , the effect of reducing the search workload

Inactive Publication Date: 2019-06-21
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

If the traditional finite element method is used, for each integration point on the contact boundary of the bearing, all the elements on the boundary of the rotating shaft are searched once, the workload of nonlinear

Method used

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  • Method for improving geometric analysis contact search efficiency
  • Method for improving geometric analysis contact search efficiency
  • Method for improving geometric analysis contact search efficiency

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0039] What the present invention intends to explain is a method for improving the contact search efficiency and stability of geometric finite element analysis models such as clearance rotating pairs.

[0040] The crank-slider mechanism is very common in mechanical systems, such as the piston-connecting rod mechanism of an engine. Figure 5 It is a schematic diagram of the crank slider mechanism of this embodiment. The crank slider mechanism includes a crank 10, a connecting rod 20, a slider 30, a bearing 40 and a rotating shaft 50. The distance between the two rotating shafts of the crank 10 is 1.2m, and the width is 0.2m. The distance between the two rotating shafts of the connecting rod 20 is 1.6m, and the width is 0.3m. The length and width of the slider 30 are both 0.3m. The inner diameter of the bearing 40 is 0.06 m. The diameter of the rotating shaft ...

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Abstract

The invention relates to a method for improving geometric analysis contact search efficiency and stability of clearance revolute pair dynamic characteristics and the like. The method comprises the following steps: as for a clearance revolute pair finite element model, performing NURBS curve modeling and using a parameterization method on the contact boundary; setting a numerical integration pointat the bearing contact boundary; for any integral point on the bearing contact boundary, calculating the distance between the integral point and each end point on the rotating shaft contact boundary,comparing the sum of the distances between the two end points of each curve section and the integral points, locating the arc section with the minimum distance sum is the contact arc section where theprojection point so that contact search amount can be reduced to one fourth of that of a conventional algorithm. Parameter values corresponding to two end points of an arc section where a projectionpoint is located and a shorter distance from an integral point are selected as initial values of nonlinear iteration, so that the stability of iterative search is improved.

Description

Technical field [0001] The present invention relates to computer-aided engineering analysis, and more specifically, to a method for improving the contact search efficiency and stability during the dynamic finite element analysis of the clearance rotation pair. The method can be used for time-advancing engineering simulation to assist Users improve the efficiency and stability of analysis when improving the design of engineering products (for example, automobiles, airplanes, machine tools, and robots). Background technique [0002] Due to factors such as design, manufacturing, processing, wear, etc., it is inevitable that there will be gaps in rotating pairs in mechanical systems (for example, automobiles, airplanes, machine tools, and robots). The clearance causes frequent contact and collision between the bearing and the rotating shaft during the relative movement, and introduces phenomena such as vibration, noise, and wear in the system, which seriously affects the accuracy of ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 皮霆张云清马冀吕天启
Owner HUAZHONG UNIV OF SCI & TECH
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