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平动式轻型装卸机机械手的优化设计 总被引:1,自引:2,他引:1
应用复合型优化设计方法 ,对平动式轻型装卸机机械手的平行四边形连杆机构进行了优化设计。优化设计的结论可应用于机械手的总体设计。 相似文献
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通过采用优化方法对原分离罗拉传动机构进行了改型优化设计,用连杆机构取代共轭凸轮机构,并开发了连杆机构计算机辅助设计软件。 相似文献
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基于MATLAB优化工具箱的平面连杆机构的设计 总被引:6,自引:5,他引:1
平面连杆机构在工程实践中的应用非常广泛。较常用的设计方法为函数逼近法,但在机构参数较少时逼近精度不高,故提出了1种基于优化设计理论的连杆机构设计方法,采用数学软件MATLAB中的优化工具箱实施。这种方法对优化变量的初值要求不高,不用编写冗长的程序,可根据机构的安装空间来减少设计变量的数目,确定目标函数,简化优化模型,提高设计效率,优化结果准确可靠。这种方法也可应用到其它机械设计中。 相似文献
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提出了一种用于辊式磨粉机辊间传动的长齿渐开线齿轮的优化设计数学模型,并对辊径250mm磨粉机的辊间齿轮传动进行了优化计算。结果表明,采用本方方法所设计的齿轮,与进口辊式磨粉机上所采用的长齿齿轮的实测结果基本一致。 相似文献
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针对齿轮连杆机构运动分析困难,不易获得完整解析解的问题,通过Solidworks快速建立齿轮连杆机构的虚拟样机,利用Motion插件进行运动仿真,可获得输出轮的位移、转速和角加速度;根据仿真结果调整机构的尺度参数,能实现只要微细改变曲柄的长度,即可调整输出轮瞬时停歇的时间长短,以满足设计的预期要求。这种方法简单直观,通用性强。 相似文献
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提出了一种用于辊式磨粉机辊间传动的非标准、长齿渐开线齿轮参数的优化设计数学模型,并对辊径250毫米辊式磨粉机的辊间齿轮传动进行了优化计算。结果表明,采用本文论述的方法所设计的齿轮,与进口辊式磨粉机所采用的辊间长齿齿轮传动的实测结果基本一致。 相似文献
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设计一种适用于典型MEMS器件结构优化设计的通用平台系统MEMS Platform(简称MP)。该平台采用了柔性模块的设计理念,将整个优化设计过程分解成参数化建模、性能仿真、优化前后处理、优化算法选择与设计、优化结果输出等5个独立功能单元,解决了典型MEMS器件结构设计中经常出现的实际性能失真、优化计算过程复杂、计算量大等问题,具有较好的实际应用及再开发价值。 相似文献
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连杆式合模机构设计中最优参数的选择是一个很难解决的问题,本文采用现代设计的理论与方法对该形式的合模机构进行优化研究,建立了综合有合模机构的力学特性、运动特性及结构尺寸的多目标优化设计模型,详细分析了该模型的约束要求,并通过算例验证所建模型在实际工程设计中非常有效。 相似文献
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It is generally known that accurate model building, i.e., proper model structure selection and reliable parameter estimation, constitutes an essential matter in the field of predictive microbiology, in particular, when integrating these predictive models in food safety systems. In this context, Versyck et al. (1999) have introduced the methodology of optimal experimental design techniques for parameter estimation within the field. Optimal experimental design focuses on the development of optimal input profiles such that the resulting rich (i.e., highly informative) experimental data enable unique model parameter estimation. As a case study, Versyck et al. (1999) [Versyck, K., Bernaerts, K., Geeraerd, A.H., Van Impe, J.F., 1999. Introducing optimal experimental design in predictive modeling: a motivating example. Int. J. Food Microbiol., 51(1), 39-51] have elaborated the estimation of Bigelow inactivation kinetics parameters (in a numerical way). Opposed to the classic (static) experimental approach in predictive modelling, an optimal dynamic experimental setup is presented. In this paper, the methodology of optimal experimental design or parameter estimation is applied to obtain uncorrelated estimates of the square root model parameters [Ratkowsky, D.A., Olley, J., McMeekin, T.A., Ball, A., 1982. Relationship between temperature and growth rate of bacterial cultures. J. Bacteriol. 149, 1-5] describing the effect of suboptimal growth temperatures on the maximum specific growth rate of microorganisms. These estimates are the direct result of fitting a primary growth model to cell density measurements as a function of time. Apart from the design of an optimal time-varying temperature profile based on a sensitivity study of the model output, an important contribution of this publication is a first experimental validation of this innovative dynamic experimental approach for uncorrelated parameter identification. An optimal step temperature profile, within the range of model validity and practical feasibility, is developed for Escherichia coli K12 and successfully applied in practice. The presented experimental validation result illustrates the large potential of the dynamic experimental approach in the context of uncorrelated parameter estimation. Based on the experimental validation result, additional remarks are formulated related to future research in the field of optimal experimental design. 相似文献
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蜂窝纸芯加工技术及关键参数 总被引:2,自引:0,他引:2
蜂窝纸板以其优异的性能得到越来越广泛的应用。本文通过研究蜂窝纸芯的加工设备,分析其成型工艺,对纸芯加工的关键参数-孔径比进行深入研究,分析不同孔径比蜂窝纸板的面外受压能力,得到实际生产纸芯所需的最佳孔径比值,为蜂窝纸芯生产及加工装置的设计提供可靠的依据。图9参9 相似文献
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目的:采用层次分析法(AHP)与发明问题解决理论(TRIZ)结合的模糊评价方法解决馒头机生产线主要存在的人机交互程度低、造型审美不足、缺乏设计特色等问题。方法:利用AHP获取定位设计重点区域;运用TRIZ标准工程参数分析矛盾冲突并构建矛盾矩阵,利用发明原理找寻设计方案最优解并引入物—场分析法解决馒头机生产线具体实际问题,运用模糊评价法对3个馒头机造型设计方案进行评分。结果:设备造型以直线、圆角和斜角为元素的A3为优选方案。结论:该方法可解决馒头机生产线设计中定性数据与定量参数的转换问题。 相似文献
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The identifiability properties of the Baranyi model for bacterial growth were investigated, both structurally and applied to real-life data. Using the Taylor-series approach, it was formally proven that the model is structurally identifiable, i.e. it is now ascertained that it is certainly possible to give unique values to all parameters of the model, provided the bacterial growth data are of sufficiently good quality. The model also has acceptable practical identifiability properties in the presence of realistic data, which means that the confidence intervals on the parameter values are reasonable. However, there was a relatively high correlation between the maximum specific growth rate μmaxand the suitability indicator h0. An optimal experimental design to improve parameter estimation uncertainty was worked out, using the sampling times of the microbial growth curve as experimental degree of freedom. Using a D-optimal design criterion, it could be shown that the optimal sampling times were concentrated in four time periods (initial, start and end of exponential growth, end of experiment), each providing maximum information on a particular parameter. Because the optimal experimental design requires a priori estimates of the parameters, the propagation of the parameter uncertainty into the experimental design was assessed with a Monte Carlo simulation. In this way, 95% confidence intervals could be established around the optimal sampling times to be used in the optimal experiment. Based on these intervals, a design was proposed and experimentally validated. The error on the parameter estimates was more than halved, their correlation diminished and the nonlinearity of the result improved. 相似文献
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变速输纸机构椭圆齿轮的计算机辅助设计 总被引:1,自引:1,他引:0
将优化设计方法应用于椭圆齿轮传动设计,根据以纸张到达前规速度最小为目标函数的数学模型,采用VB语言开发出变速输纸机构中椭圆齿轮的计算机辅助设计软件,该软件首先根据工艺要求优化设计出椭圆的长短轴,然后进行结构设计,分析计算结果,并将计算结果输出到文本中保存,最后进行椭圆齿轮零件图的绘制.通过实例验证该软件在实际应用中具有一定的实用价值. 相似文献