为提高采煤机关键零件建模与有限元分析效率,降低对用户软件操作水平的要求,在Visual Studio 2012集成编译环境下,利用NX二次开发工具开发了采煤机关键零件参数化建模与分析系统。该系统将用户输入参数和应用程序中接口函数相关联,以尺...为提高采煤机关键零件建模与有限元分析效率,降低对用户软件操作水平的要求,在Visual Studio 2012集成编译环境下,利用NX二次开发工具开发了采煤机关键零件参数化建模与分析系统。该系统将用户输入参数和应用程序中接口函数相关联,以尺寸驱动的方法,通过修改参数表达式,实现采煤机关键零件参数化建模;借助Journal日志工具,通过获取NX NASTRAN接口函数实现参数化有限元分析。实例验证了该系统的有效性。展开更多
Using high strength steel and ultra-high strength steel in hot stamping and automobile parts is one of the most important ways of the automobile lightweight,which is the development trend of automobiles currently.In t...Using high strength steel and ultra-high strength steel in hot stamping and automobile parts is one of the most important ways of the automobile lightweight,which is the development trend of automobiles currently.In this paper, the development of test device for heat friction coefficient by high strength steel can provide important technical parameters for hot stamping process,making the right selection of equipment types,mold design,technology optimization,and research and development of lubrication medium of press forming.At the same time,the experiments indicate that the instrument has not only accurate test result but also good repeatability.展开更多
Single-index varying-coefficient models (SIVCMs) are very useful in multivariate nonparametric regression.However,there has less attention focused on inferences of the SIVCMs.Using the local linear method,we propose e...Single-index varying-coefficient models (SIVCMs) are very useful in multivariate nonparametric regression.However,there has less attention focused on inferences of the SIVCMs.Using the local linear method,we propose estimates of the unknowns in the SIVCMs.In this article,our main purpose is to examine whether the generalized likelihood ratio (GLR) tests are applicable to the testing problem for the index parameter in the SIVCMs.Under the null hypothesis our proposed GLR statistic follows the chi-squared distribution asymptotically with scale constant and degree of freedom independent of the nuisance parameters or functions,which is called as Wilks' phenomenon (see Fan et al.,2001).A simulation study is conducted to illustrate the proposed methodology.展开更多
文摘为提高采煤机关键零件建模与有限元分析效率,降低对用户软件操作水平的要求,在Visual Studio 2012集成编译环境下,利用NX二次开发工具开发了采煤机关键零件参数化建模与分析系统。该系统将用户输入参数和应用程序中接口函数相关联,以尺寸驱动的方法,通过修改参数表达式,实现采煤机关键零件参数化建模;借助Journal日志工具,通过获取NX NASTRAN接口函数实现参数化有限元分析。实例验证了该系统的有效性。
基金National Science and Technology Supporting Program of China(No.2011BAG03B02)
文摘Using high strength steel and ultra-high strength steel in hot stamping and automobile parts is one of the most important ways of the automobile lightweight,which is the development trend of automobiles currently.In this paper, the development of test device for heat friction coefficient by high strength steel can provide important technical parameters for hot stamping process,making the right selection of equipment types,mold design,technology optimization,and research and development of lubrication medium of press forming.At the same time,the experiments indicate that the instrument has not only accurate test result but also good repeatability.
基金supported by National Natural Science Foundation of China (Grant Nos.10871072,11101114 and 11171112)PhD Program Foundation of Ministry of Education of China (Grant No.20090076110001)
文摘Single-index varying-coefficient models (SIVCMs) are very useful in multivariate nonparametric regression.However,there has less attention focused on inferences of the SIVCMs.Using the local linear method,we propose estimates of the unknowns in the SIVCMs.In this article,our main purpose is to examine whether the generalized likelihood ratio (GLR) tests are applicable to the testing problem for the index parameter in the SIVCMs.Under the null hypothesis our proposed GLR statistic follows the chi-squared distribution asymptotically with scale constant and degree of freedom independent of the nuisance parameters or functions,which is called as Wilks' phenomenon (see Fan et al.,2001).A simulation study is conducted to illustrate the proposed methodology.
