Structure Optimization Of Motorcycle Seat Cushion Bottom Plate

As a key component of motorcycle seat cushion, main function of motorcycle seatcushion bottom plate is to bear human body weight for alleviating stress impact. Inrecent years, development of motorcycle manufacturing enterprise has been limited intoa bottleneck, with high cost and poor performance. Disadvantage of low profit marginhas appeared. Faced with increasingly fierce industry competition, motorcycleenterprises are enhancing autonomous R&D capability as well. Via improving productmix, promoting product feature and shrinking material types of product, a new profitmargin point is aimed to be discovered.Based upon an associated R&D program with an enterprise, taking motorcycle seatcushion baseboard as research object, utilizing finite-element theory, geometrical modelis established in CATIA software for entity model of motorcycle cushion and importedinto HyperWorks and ANSYS Workbench software for associated simulation upgradeddesign. As per operation status and requirement offered by manufacturer, finite-elementanalysis is conducted on two operation status of motorcycle seat cushion bottom plate toacquire distribution diagram for compliance value, first six natural frequencies, shift andstress of seat cushion bottom plate. Based upon the data, dynamic evaluation and loadevaluation are conducted to detect frequency and rigidity deficiencies of bottom platefor specifying optimization conception priority is given to product performanceoptimization rather than quantifying.While optimizing product performance, two indexes of compliance and frequencyare primarily emphasized. Basing upon thin shell feature of bottom plate, onHyperWorks platform, via combining topology optimization with shape optimization,synchronization computation is conducted. On premises that mass is confined,optimization results of three target functions. minimum compliance in twistingcondition, minimum compliance in bending condition, maximum frequency in torsioncondition, respectively. Via utilizing evaluation function, evaluation function isestablished to mediate twisting and bending conditions. Two target functions forfrequency and compliance are turned into one target. Associated optimization issuecombining multi-targets and multi-condition is resolved, which is obviously superior tothe result of single target optimization. Compared with previous model, performancecan be largely enhanced. As for lightweight optimization, basing upon optimization result of topology andshape, model optimized is imported into ANSYS Workbench software. Basing upondensity contour and shape changing contour during above-mentioned optimization,dimension optimizations for two design locations are respectively designed. Duringoptimization, as for multi-targets with minimum mass and one natural frequency,response interface is constructed via test design data and sensitivity of each parameter isanalyzed. Most optimized resolution is obtained via genetic algorithm and final model isacquired.During the whole optimization process, not only topology, shape and dimensionoptimizations are comprehensively utilized to lower the mass of bottom plate for19%without reducing its performance, but also actual issue of multi-targets andmulti-conditions is resolved by utilizing evaluation function and genetic algorithm.