期刊文献+
共找到6篇文章
< 1 >
每页显示 20 50 100
多机械系统的固定时间一致性设计
1
作者 孟云斐 王保防 蔡明洁 《控制工程》 CSCD 北大核心 2024年第1期61-69,共9页
针对具有未知非线性特性和扰动的多机械系统一致性问题,提出了一种基于径向基函数(radial basis function,RBF)神经网络的固定时间一致性算法。首先,建立了存在未知非线性函数项和不确定扰动的多机械系统模型;其次,根据系统模型设计了... 针对具有未知非线性特性和扰动的多机械系统一致性问题,提出了一种基于径向基函数(radial basis function,RBF)神经网络的固定时间一致性算法。首先,建立了存在未知非线性函数项和不确定扰动的多机械系统模型;其次,根据系统模型设计了一种固定时间一致性协议,利用RBF神经网络来逼近模型中未知的非线性项;再次,利用李雅普诺夫稳定性理论证明了任意一对机械系统的位置和速度误差可以在固定时间内收敛到零的小邻域内;最后,通过MATLAB仿真软件验证所设计协议的有效性。仿真结果表明,所提出的协议能够实现预期目标。 展开更多
关键词 固定时间一致性 多机械系统 神经网络 李雅普诺夫理论
下载PDF
The bond graph model of planar flexible multibody mechanical systems and its dynamic principle 被引量:5
2
作者 王中双 陆念力 陈集 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2006年第1期6-11,共6页
In order to increase the efficiency and reliability of the dynamic analysis for flexible planar linkage containing the coupling of multi-energy domains, a method based on bond graph is introduced. From the viewpoint o... In order to increase the efficiency and reliability of the dynamic analysis for flexible planar linkage containing the coupling of multi-energy domains, a method based on bond graph is introduced. From the viewpoint of power conservation, the peculiar property of bond graph multiport element MTF is discussed. The procedure of modeling planar flexible muhibody mechanical systems by bond graphs and its dynamic principle are deseribed. To overcome the algebraic difficulty brought by differential causality anti nonlinear junction structure, the constraint forces at joints can be considered as unknown effort sources and added to the corresponding O-junctions of system bond graph model. As a result, the automatic modeling on a computer is realized. The validity of the procedure is illustrated by a practical example. 展开更多
关键词 flexible multibody system coupling dynamics bond graph dynamic principle
下载PDF
Optimal design method for force in vibration control of multi-body system with quick startup and brake 被引量:3
3
作者 唐华平 彭娅清 《Journal of Central South University of Technology》 EI 2005年第4期459-464,共6页
A kind of active vibration control method was presented through optimal design of driving load of multi-body system with quick startup and brake. Dynamical equation of multi-body system with quick startup and brake wa... A kind of active vibration control method was presented through optimal design of driving load of multi-body system with quick startup and brake. Dynamical equation of multi-body system with quick startup and brake was built, and mathematical model of representing vibration control was also set up according to the moving process from startup to brake. Then optimization vibration control model of system driving load was founded by applying theory of optimization control, which takes rigid body moving variable of braking moment as the known condition, and vibration control equation of multi-body system with quick startup and brake was converted into boundary value problem of differential equation. The transient control algorithm of vibration was put forward, which is the analysis basis for the further research. Theoretical analysis and calculation of numerical examples show that the optimal design method for the multi-body system driving load can decrease the vibration of system with duplication. 展开更多
关键词 vibrationl multi-body system active control
下载PDF
Design of a Mechanical Release System of Predator Insects to Control the Colorado Potato Beetle, Leptinotarsa Decemlineata (Say) 被引量:1
4
作者 Sylvain de Ladurantaye Mohamed Khelifi 《Journal of Environmental Science and Engineering(B)》 2012年第6期756-762,共7页
The CPB (Colorado potato beetle), Leptinotarsa decemlineata (Say), is the major insect pest of potato crops in North America, Europe and Asia. Large amounts of chemical insecticides are used to control this insect... The CPB (Colorado potato beetle), Leptinotarsa decemlineata (Say), is the major insect pest of potato crops in North America, Europe and Asia. Large amounts of chemical insecticides are used to control this insect pest. Also, the CPB has developed over the years a resistance to most of the registered chemical insecticides, including those that were effective at one time. One of the most promising alternatives to chemical insecticides consists of taking advantage of natural enemies. The use of the stinkbug predator Perillus bioculatus to control the CPB has been successful at small scale. However, this natural enemy is not abundant in the nature and its hand release at large scale is not realistic. To remedy to this problem, predators must be massively released in potato fields using a mechanical distributor. Such a machine has been successfully designed and built at the Department of Soils and Agri-Food Engineering of University Lavak In this distributor, masses of predators are placed in small containers and mixed with a carrier material. In the field, the containers are mechanically opened at different locations, based on a source-point mass release option. These locations are determined in advance following a field monitoring of the populations of CPBs. Field trials proved that the mechanical distributor is reliable and ease of use. Its efficiency in releasing insect predators is high and comparable to that obtained in previous laboratory tests. 展开更多
关键词 POTATO Colorado potato beetle chemical insecticides biological control natural enemies source-point mass release mechanical distributor.
下载PDF
A novel stochastic collocation method for uncertainty propagation in complex mechanical systems 被引量:1
5
作者 QI WuChao TIAN SuMei QIU ZhiPing 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第2期47-54,共8页
This paper presents a novel stochastic collocation method based on the equivalent weak form of multivariate function integral to quantify and manage uncertainties in complex mechanical systems. The proposed method, wh... This paper presents a novel stochastic collocation method based on the equivalent weak form of multivariate function integral to quantify and manage uncertainties in complex mechanical systems. The proposed method, which combines the advantages of the response surface method and the traditional stochastic collocation method, only sets integral points at the guide lines of the response surface. The statistics, in an engineering problem with many uncertain parameters, are then transformed into a linear combination of simple functions' statistics. Furthermore, the issue of determining a simple method to solve the weight-factor sets is discussed in detail. The weight-factor sets of two commonly used probabilistic distribution types are given in table form. Studies on the computational accuracy and efforts show that a good balance in computer capacity is achieved at present. It should be noted that it's a non-gradient and non-intrusive algorithm with strong portability. For the sake of validating the procedure, three numerical examples concerning a mathematical function with analytical expression, structural design of a straight wing, and flutter analysis of a composite wing are used to show the effectiveness of the guided stochastic collocation method. 展开更多
关键词 uncertainty propagation stochastic collocation method equivalent weak form guided surface STATISTICS
原文传递
Virtual design and analysis with multi-dimension coupling for engineering machinery cooling system 被引量:3
6
作者 CAI HuiKun QIAN YaoYi +3 位作者 HOU Liang WANG WenWu ZHANG EnLai YANG WeiPing 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2015年第1期117-122,共6页
A good cooling circle should ensure that the system can work at an appropriate temperature in the requirements of power increase,engine compartment constraint and working demands for modern engineering machinery,which... A good cooling circle should ensure that the system can work at an appropriate temperature in the requirements of power increase,engine compartment constraint and working demands for modern engineering machinery,which asks for a thorough understanding of system thermal loads before practical production.However,traditional experiment method spends a long time,costs a huge resource but lacks efficiency,whereas virtual design can avoid the shortcomings of traditional method and can analyze operating states adequately with variable loads on engine,generator,drives,battery pack and HVAC systems.Therefore,this paper focuses on a new virtual design method based on multi-dimension coupled simulation adopting Flowmaster software for initial prediction and CFX tool for further optimization.The simulation results in different operating conditions are compared and validated with experiments.Orthogonal experiment and range analysis are used to explore key parameters of cooling system.The research will be helpful in guiding future design and optimization of engineering machinery. 展开更多
关键词 engineering machinery cooling system virtual design multi-dimension coupled simulation radiator air inlet temperature
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部