Virtual instrument is playing the important role in automatic test system. This paper introduces a composition of a virtual instrument automatic test system and takes the VXIbus based a test software platform which is...Virtual instrument is playing the important role in automatic test system. This paper introduces a composition of a virtual instrument automatic test system and takes the VXIbus based a test software platform which is developed by CAT lab of the UESTC as an example. Then a method to model this system based on Petri net is proposed. Through this method, we can analyze the test task scheduling to prevent the deadlock or resources conflict. At last, this paper analyzes the feasibility of this method.展开更多
Based on the analysis of a virtual enterprise and the development of supply chain management, their integration is proposed. Then, the difference between multi-agent system modeling method and the traditional modeling...Based on the analysis of a virtual enterprise and the development of supply chain management, their integration is proposed. Then, the difference between multi-agent system modeling method and the traditional modeling method is analyzed, and a method based on Java agent framework for multi-agent systems（ JAFMAS） is proposed. By using this method the virtual enterprise＇ s supply chain management system model is established.展开更多
In textile and apparel field,the CAD technology has been developed rapidly.The CAD system with the func-tions of pattern making,marking and grading has be-come substantial equipment for an apparel factory,But this app...In textile and apparel field,the CAD technology has been developed rapidly.The CAD system with the func-tions of pattern making,marking and grading has be-come substantial equipment for an apparel factory,But this apparel CAD system is only one graphic system con-centrating on the two-dimensional paper patterns,the three-dimensional apparel CAD system or virtual reali-ty apparel CAD is still not put into practical use.But it is one of the most interesting studying fields for展开更多
无刷直流电机(Brushless DC Motor,简称BLDCM)凭借高功率密度、高效能以及低维护费用等优势,在工业自动化、航空航天、电力巡检等多个领域被广泛采用[1]。不过,受其自身独特结构的制约,电机在运转过程中会产生以齿槽转矩为主导的非线性...无刷直流电机(Brushless DC Motor,简称BLDCM)凭借高功率密度、高效能以及低维护费用等优势,在工业自动化、航空航天、电力巡检等多个领域被广泛采用[1]。不过,受其自身独特结构的制约,电机在运转过程中会产生以齿槽转矩为主导的非线性干扰,这极大地阻碍了系统模型的精准辨识,进而对高性能控制算法的研发与应用造成限制。通过深入剖析了无刷直流电机非线性干扰对系统辨识产生的作用,进而提出一种借助小波包变换的开环辨识策略,以及一种基于虚拟对象建模的闭环辨识策略,达到提高无刷直流电机模型在非线性干扰环境下的辨识精度,通过仿真与实验验证,所提出的方法在不同工作点、不同干扰位置的情况下,均能大幅提升模型辨识的精准度。展开更多
The contribution of functional virtual prototyping to vehicle chassis development is presented. The different topics that we took into consideration were reform analysis and improvement design during the vehicle chass...The contribution of functional virtual prototyping to vehicle chassis development is presented. The different topics that we took into consideration were reform analysis and improvement design during the vehicle chassis development. A frame of coordinates based on the digital-model was established, the main CAE analy- sis methods, multi-body system dynamics and finite element analysis were applied to the digital-model build by CAD/CAM software. The method was applied in the vehicle chassis reform analysis and improvement design, all the analysis and design projects were implemented in the uniform digital-model, and the development was carried through effectively.展开更多
基金Supported by the Ministry of Education for Ph. D (20030614006)
文摘Virtual instrument is playing the important role in automatic test system. This paper introduces a composition of a virtual instrument automatic test system and takes the VXIbus based a test software platform which is developed by CAT lab of the UESTC as an example. Then a method to model this system based on Petri net is proposed. Through this method, we can analyze the test task scheduling to prevent the deadlock or resources conflict. At last, this paper analyzes the feasibility of this method.
基金the National Natural Sciences Foundation under Grant No.50575065Anhui Province Natural Sciences Foundation under Grant No.03042306
文摘Based on the analysis of a virtual enterprise and the development of supply chain management, their integration is proposed. Then, the difference between multi-agent system modeling method and the traditional modeling method is analyzed, and a method based on Java agent framework for multi-agent systems（ JAFMAS） is proposed. By using this method the virtual enterprise＇ s supply chain management system model is established.
文摘In textile and apparel field,the CAD technology has been developed rapidly.The CAD system with the func-tions of pattern making,marking and grading has be-come substantial equipment for an apparel factory,But this apparel CAD system is only one graphic system con-centrating on the two-dimensional paper patterns,the three-dimensional apparel CAD system or virtual reali-ty apparel CAD is still not put into practical use.But it is one of the most interesting studying fields for
文摘无刷直流电机(Brushless DC Motor,简称BLDCM)凭借高功率密度、高效能以及低维护费用等优势,在工业自动化、航空航天、电力巡检等多个领域被广泛采用[1]。不过,受其自身独特结构的制约,电机在运转过程中会产生以齿槽转矩为主导的非线性干扰,这极大地阻碍了系统模型的精准辨识,进而对高性能控制算法的研发与应用造成限制。通过深入剖析了无刷直流电机非线性干扰对系统辨识产生的作用,进而提出一种借助小波包变换的开环辨识策略,以及一种基于虚拟对象建模的闭环辨识策略,达到提高无刷直流电机模型在非线性干扰环境下的辨识精度,通过仿真与实验验证,所提出的方法在不同工作点、不同干扰位置的情况下,均能大幅提升模型辨识的精准度。
文摘The contribution of functional virtual prototyping to vehicle chassis development is presented. The different topics that we took into consideration were reform analysis and improvement design during the vehicle chassis development. A frame of coordinates based on the digital-model was established, the main CAE analy- sis methods, multi-body system dynamics and finite element analysis were applied to the digital-model build by CAD/CAM software. The method was applied in the vehicle chassis reform analysis and improvement design, all the analysis and design projects were implemented in the uniform digital-model, and the development was carried through effectively.
