Method for optimally designing durability of structure on basis of reliable service life

An optimized design and durability technology, applied in computing, special data processing applications, instruments, etc., can solve problems such as difficulty in solving durability optimization, large amount of calculation, and it is not easy to convert equivalently into a deterministic function, so as to improve efficiency. and convergence, simplifying the optimization model, the effect of strong practical value

Inactive Publication Date: 2013-11-20
中国兵器科学研究院
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Problems solved by technology

[0008] The above two models both contain a reliable life function N(x, d). At present, the reliable life is

Method used

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  • Method for optimally designing durability of structure on basis of reliable service life
  • Method for optimally designing durability of structure on basis of reliable service life
  • Method for optimally designing durability of structure on basis of reliable service life

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Embodiment Construction

[0025] The flow chart of the present invention is as figure 1 shown, including the following steps:

[0026] 1 Determine the objective function, constraint function, design variables, random variables, and build a mathematical model for optimal design of structural durability.

[0027] Aiming at engineering problems, the relevant disciplines and methods are applied to determine the three elements of the optimization design model in turn, including objectives, constraints, and variables.

[0028] (1) Objective function. Taking the reliable life of the structure as the goal, the reliable life needs to call the simulation tool to calculate the stress, strain, etc., and then use the life model to calculate; or it is a calculation function for performance, cost, weight, volume, etc.

[0029] (2) Random variables. Random variables are the main cause of random fluctuations in product life, such as torque, rotational speed, and pressure on mechanical products. In the process of rel...

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Abstract

The invention provides a method for optimally designing the durability of a structure. The reliable service life is an object/a constraint in the method. The method mainly includes five steps of determining objective functions, constraint functions, design variables and random variables and constructing a mathematical model for optimally designing the durability of the structure; computing the reliable service life by a function measurement process; screening the design variables on the basis of the sensitivity of the reliable service life; equivalently converting the objective function/the constraint functions of the reliable service life into deterministic functions by a sequential approximation programming process; solving a model for optimizing the durability of the structure by a mixed cycle function measurement process. The method has the advantage that an optimal design scheme which meets the requirement on the longest reliable service life of the structure or the durability of the structure can be determined by means of an optimal design.

Description

technical field [0001] The invention provides a method for structural optimization design with the reliable life of the structure as the target / constraint, and belongs to the field of structural durability and reliability design. Background technique [0002] The structural design of aircraft, vehicles, machine tools, and buildings all have durability requirements. For example, the landing gear of foreign aircraft requires 80,000 landings. In terms of energy saving and emission reduction, the weight and volume of mechanical products are required to be greatly reduced, and the cost is reduced. , durability and other requirements are constantly improving. How to ensure or even improve product durability under the premise of meeting performance requirements and reducing weight and volume has become the key to product design. The random fluctuations of various uncertain factors in engineering practice, such as load, material properties, structural size, environment and working c...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 刘勤姬广振钱云鹏涂宏茂刘英赵丹李娟王丹李涛李阳
Owner 中国兵器科学研究院
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