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A global stress constrained topology optimization method for compliant mechanisms based on K-S function is presented

A stress-constrained, compliant mechanism technology, applied in design optimization/simulation, special data processing applications, electrical digital data processing, etc., can solve problems such as highly nonlinear behavior, large number of constraints, and large amount of calculation, and achieve the phenomenon of stress concentration. Mitigation, Static Strength Requirements Satisfaction, Reduced Calculation Effects

Active Publication Date: 2019-03-22
EAST CHINA JIAOTONG UNIVERSITY
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Problems solved by technology

At present, for compliant mechanisms, the local stress topology optimization design that meets the strength requirements is likely to cause singular solution phenomena and highly nonlinear behavior problems, and the stress of all elements is used as constraints, resulting in a huge number of constraints, resulting in a huge amount of calculation and low efficiency. Low

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  • A global stress constrained topology optimization method for compliant mechanisms based on K-S function is presented
  • A global stress constrained topology optimization method for compliant mechanisms based on K-S function is presented
  • A global stress constrained topology optimization method for compliant mechanisms based on K-S function is presented

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[0065] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0066] Such as figure 1 As shown, the K-S function-based global stress-constrained topology optimization method of the compliant mechanism of the present invention includes the following steps:

[0067] (a) Define the design domain of the compliant mechanism, applied loads, virtual loads, and boundary conditions, set the input and output spring stiffnesses, design variable filter radius, volume constraints, and limit values ​​of stress constraints, and discretize the initial design domain into N finite elements, and Initialize the parameters of the moving asymptote algorithm;

[0068] (b) Use the improved SIMP material interpolation method to penalize the stiffness of each unit, and perform ...

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Abstract

global stress constrained topology optimization method for compliant mechanisms based on K-S function is presented. The method comprises the following steps: (1) defining a design domain and initializing design variables; (2) punishing the stiffness of the structural element and obtaining the displacement and stress of the structure by the finite element method; (3) Using K-The S function condenses the local stress constraints of all elements into a global maximum stress constraint. (4) sloving Sensitivity of cross-strain energy objective function, sensitivity of volume and maximum stress constraint; 5) modifying that sensitivity of the sensitivity filtering technology; (6) Moving asymptotic algorithm is used to solve the optimization problem, and the optimal topology is obtained by iterating until the convergence criterion is satisfied. The S-function condenses the large number of constraints caused by the stresses in all elements into a global constraint, which greatly improves the computational efficiency. The topology optimization method of the invention enables the compliant mechanism configuration to avoid the hinge-like structure, meets the strength requirements, and alleviates the stress concentration phenomenon.

Description

technical field [0001] The invention relates to a K-S function-based global stress-constrained topology optimization method for a compliant mechanism, which belongs to the technical field related to the optimal design of a compliant mechanism. Background technique [0002] The compliant mechanism uses the elastic deformation of its own flexible components to transmit motion, force or energy. It has excellent characteristics such as easy processing, no assembly, low vibration and noise, no friction and no lubrication, and easy integration of modern drive technology, making it in micro / It has a wide range of applications in nano-manufacturing, precision machining, precision positioning, micro-electro-mechanical systems and other fields. [0003] At present, there are mainly two methods for the design of compliant mechanisms: pseudo-rigid body model method and topology optimization method. When using the pseudo-rigid body model to deal with the design of compliant mechanisms,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F2119/06G06F30/20
Inventor 占金青涂茜龙良明刘敏彭怡平王云涛秦洋洋
Owner EAST CHINA JIAOTONG UNIVERSITY
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