Reliability design method for upper crossbeam of high-speed pressure machine

A design method and reliability technology, applied in computing, special data processing applications, instruments, etc., can solve problems such as calculation errors of probability model parameter structure reliability

Active Publication Date: 2015-05-20
ZHEJIANG UNIV
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Problems solved by technology

Probabilistic reliability analysis requires a large amount of sample data to obtain accurate probability distribution information about uncertain quantities. However, only very limited sample data can be obtained in engineering, and probabilistic reliability may be sensitive to the distribution information of random parameters. That is, a small error in the parameters of the probability model can cause a large error in the calculation of the structural reliability

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  • Reliability design method for upper crossbeam of high-speed pressure machine
  • Reliability design method for upper crossbeam of high-speed pressure machine
  • Reliability design method for upper crossbeam of high-speed pressure machine

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Embodiment Construction

[0057] The present invention will be further described below in conjunction with drawings and embodiments.

[0058] Such as figure 1 Shown, the present invention a kind of high-speed press upper beam reliability design method, comprises the following steps:

[0059] (1) Establish a reliability design model for the upper beam of a high-speed press that describes uncertain factors in intervals:

[0060] Select the upper beam of a certain type of high-speed press as the research object, such as figure 2 Shown as its 1 / 4 model, according to the actual design requirements, to Figure 4 The cross-sectional dimension h of the upper and middle beams 1 、h 2 , l 1 , l 2 and l 3 Design variables for the size, with image 3 The external force P shown 1 ,P 2 ,P 3 The density ρ is the uncertainty factor described in the interval, and the deformation is the optimization design goal. The maximum allowable stress of the upper beam is [60,61] MPa, and the reliability requirement is ...

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Abstract

The invention discloses a reliability design method for an upper crossbeam of a high-speed pressure machine. The method includes the steps: selecting design variables according to reliability requirements in practical upper crossbeam design to establish a reliability design model for the upper crossbeam of the high-speed pressure machine, wherein uncertainty factors are described by intervals; in an experimental design, acquiring sample points required for Kriging fitting by means of LHS (Latin hypercube sampling), acquiring an objective function and a constraint function corresponding to each sample point by means of collaborative simulation to construct a Kriging model; calculating reliability constraint values in the reliability design model on the basis of uniform interval dominance degrees; adopting a double-layer nested genetic algorithm based on interval constraint violation degrees to search an optimal design scheme meeting the reliability requirements. According to the practical reliability requirements of the upper crossbeam of the high-speed pressure machine, reliability index values are calculated according to uniform interval dominance degrees in the reliability design, and the design scheme, meeting the reliability requirements, of the upper crossbeam of the high-speed pressure machine can be acquired conveniently and quickly.

Description

technical field [0001] The invention relates to a reliability design method for an upper beam of a high-speed press. technical background [0002] The performance of high-speed presses directly affects the precision, performance and production efficiency of stamping products. As an important part of high-speed presses, the upper beam has a direct and important effect on the overall working performance and processing accuracy of the press. influences. In order to improve the machining accuracy and work efficiency of the press, and reduce production costs and energy consumption, it is necessary to reduce the weight of the upper beam while increasing the stiffness and strength of the upper beam as much as possible. Therefore, it is necessary to target high stiffness and light weight. reliability design. [0003] In the actual design and manufacture of high-speed presses, there are certain uncertain fluctuations in the stress and material properties of the upper beam, which ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 程锦吴震宇刘振宇谭建荣
Owner ZHEJIANG UNIV
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