機(jī)械模具類(lèi)外文翻譯----現(xiàn)在設(shè)計(jì)優(yōu)化方法基礎(chǔ)-模具設(shè)計(jì)-全文預(yù)覽
【正文】 as the maximum stress,can be used to ascertain the validity of the the design process,the engineer may alter parameters or characteristics of the CAD and／ or FEA models,including some of the physical dimensions,the material or how the part or assembly is loaded or between the CAD and FEA software should allow the engineer to alter the model in either application,and have the other automatically reflect these example,if the thickness of a part is changed or a hole is added in the CAD software,the FEA model’s mesh should automatically reflect those most circumstances,engineers will employ linear static FEA to obtain the analysis approach has the benefit of yielding a solution for FEA models with many elements in relatively little ,linear static FEA has drawbacks as example,significant engineering expertise may be required when estimating the magnitude and direction of loads that are a consequence of motion. Background and Theoy In this section,wo focus on the theory underlying some of the machematical me thods employed by design optimization ,first we describe how the optimization problem a threestep process: （ 1） Generation of geometry of part or assembly in CAD。it can be safely assumed that this surface coincides with a surface in the CAD ,if the design optimization algorithm decides to alter the geometry of the CAD surface,then the FEA model must automatically reflect these changes,and apply the constraints on the new representation of this ,associativity is required in order to achieve this automatic munication between the CAD and FEA defined the design optimization problem for mechanical systems,we now describe the mathematics used to solve these problems. Most optimization problems are made up of three basic ponents. （ 1） An objective function which we want to minimize(or maximize).For instance,in designing an automobile panel,we might want to minimize the stress in a particular region. （ 2） A set of design variables that affect the value of the objective the automobile panel design problem,the variables used define the geometry and material of the panel. （ 3） A set of constrains that allow the design variables to have certain values but exclude the automobile panel design problem,we would probably want to limit its weight. It is possible to develop an optimization problem without may argue that almost all problems have some form of instance,the thickness of the automotive panel cannot be in practice,answers that make good sense in terms of the underlying physics,such as a positive thickness,can often be obtained without enforcing constraints on the design variables. Benefits and Drawbanks The elimination or reduction of repetitive manual tasks has been the impetus behind many softwa
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