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Topological optimization design method for compliant mechanism with specified real output displacement

A compliant mechanism and topology optimization technology, applied in the field of compliant mechanism topology optimization design and compliant mechanism optimization design, can solve problems such as virtual spring stiffness and not real output displacement, and achieve the effect of avoiding numerical instability.

Active Publication Date: 2020-01-17
EAST CHINA JIAOTONG UNIVERSITY
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Problems solved by technology

[0004] The main problems in the prior art are as follows: for the design of the compliance mechanism with a specified real output displacement (that is, the output of the compliance mechanism when the output end does not operate the workpiece Displacement), the existing model cannot be solved, because the output displacement obtained by the compliant mechanism is the displacement containing the virtual spring stiffness instead of the real output displacement after the virtual spring is added to the input and output

Method used

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  • Topological optimization design method for compliant mechanism with specified real output displacement
  • Topological optimization design method for compliant mechanism with specified real output displacement
  • Topological optimization design method for compliant mechanism with specified real output displacement

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Embodiment

[0055]A topology optimization design method for a compliant mechanism with a specified real output displacement, specifically comprising the following steps:

[0056] (a) the compliant mechanism is a compliant displacement reverse mechanism, figure 1 Shown is the design domain of the topology optimization of the compliant displacement inverse mechanism, the design domain is set as a square, the side length l is 100 mm, the upper left corner and the lower left corner are fixed, and the right direction is applied at the midpoint of the left boundary Input force F in For 10N, it is expected that the midpoint of the right boundary produces a displacement to the left with the specified true output The design domain is discretized into 100×100 square finite elements.

[0057] (b) The Young's modulus of the material in the design domain is set to 1GPa, the Young's modulus of the empty element is set to 0.001GPa, and Poisson's ratio is 0.3, and a virtual input spring is added at th...

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Abstract

The invention discloses a topological optimization design method for a compliant mechanism with specified real output displacement. A model containing a virtual input spring and an output spring is used for auxiliary calculation, and a displacement field obtained without the virtual input spring and the output spring is used as a real calculation target, so that the obtained compliant mechanism has specified real output displacement; and meanwhile, a self-adaptive output spring stiffness method and a self-adaptive weighting factor method are introduced, so that the output spring stiffness canbe automatically adjusted along with the displacement of a given target, and the relative weight of two sub-targets can be automatically adjusted. The numerical instability phenomenon of topological optimization of the compliant mechanism is avoided, and the output displacement obtained by the compliant mechanism can reach the specified real output displacement.

Description

technical field [0001] The invention belongs to the technical field of optimization design and relates to the optimal design of a compliant mechanism, in particular to a topology optimization design method of a compliant mechanism with a specified real output displacement. Background technique [0002] Compliant mechanism is a mechanism that transmits force or motion through its own elastic deformation. It is usually processed in one piece. It has the advantages of high precision, no friction and wear, no gap, and compact structure. Therefore, it is widely used in the field of precision engineering. [0003] The main design method of the compliant mechanism is topology optimization. In the topology optimization of the compliant mechanism, under a given input force or input displacement, the output displacement of the compliant mechanism is required to be as large as possible, and at the same time, it must have a certain rigidity to resist external loads. In order to meet the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23
Inventor 刘敏汪庭威占金青孙宇赵延尹来荣
Owner EAST CHINA JIAOTONG UNIVERSITY
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