Improved pattern search algorithm based on optimal design of fixture locator layout

In the machining and detecting process, fixture is always one important part. Because it offers apropriate locating and clamping for the process, and a fixture with its locating accuracy affects much on the final accuracy. Therefore it is necessary to analysis the performance of a fixture, and the optimal design of fixture layout is a common way to improve its performance. Around the optimization design of fixture locator layout, firstly, the model of locators´ tiny displacement and location variation of a workpiece was built and linearized to achieve a measurement of the fixture locating accuracy; secondly, to improve the optimal result of optimization algorithm, pattern search algorithm was introduced into locator layout design and improved; finally, one blade model was taken into an example, corresponding fixture layout optimization design was achieved. It is proved by the example that the optimization design method proposed can get a better computing result and a much less iterate steps.