全文获取类型
收费全文 | 147篇 |
免费 | 6篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 5篇 |
综合类 | 4篇 |
金属工艺 | 3篇 |
机械仪表 | 51篇 |
建筑科学 | 1篇 |
矿业工程 | 1篇 |
能源动力 | 3篇 |
轻工业 | 1篇 |
武器工业 | 3篇 |
无线电 | 4篇 |
一般工业技术 | 13篇 |
自动化技术 | 65篇 |
出版年
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 3篇 |
2019年 | 4篇 |
2018年 | 1篇 |
2017年 | 4篇 |
2015年 | 2篇 |
2014年 | 5篇 |
2013年 | 6篇 |
2012年 | 5篇 |
2011年 | 6篇 |
2010年 | 1篇 |
2009年 | 20篇 |
2008年 | 18篇 |
2007年 | 16篇 |
2006年 | 13篇 |
2005年 | 4篇 |
2004年 | 8篇 |
2003年 | 6篇 |
2002年 | 1篇 |
2001年 | 3篇 |
2000年 | 4篇 |
1999年 | 6篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 5篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
排序方式: 共有154条查询结果,搜索用时 203 毫秒
11.
Modeling and Lyapunov controller design for transverse vibration of a flexible cable transporter system with arbitrarily varying lengths are presented using Hamilton's principle and Lyapunov theory. The axial velocity of the system is assumed to be unknown in the model. This is different from existing literature where the axial velocity is assumed either to be constant or prescribed. The governing equations include two coupled non-linear Partial Differential Equations (PDEs) and boundary conditions. The interactions between the cables and the slider, pulleys, and motors are included in the model. Numerical solution of the derived governing equations is obtained using Galerkin's method. Based on the Lyapunov theory, we propose two boundary controllers and one domain point-wise controller, which suppress the transverse vibration of the cables effectively while assuring the attainment of the slider goal. The proposed controllers dissipate the vibration energy and guarantee the stability of the closed-loop system in Lyapunov sense. Simulation results demonstrate the effectiveness of the proposed controllers.A short version of this paper was presented in 2004 ASME International Mechanical Engineering Conference and Exposition, Anaheim CA, November 14-19, 2004. 相似文献
12.
A continuously variable transmission (CVT) is an emerging automotive transmission technology that offers a continuum of gear
ratios between desired limits. A chain CVT is a friction-limited drive as its performance and torque capacity rely significantly
on the friction characteristic of the contact patch between the chain and the pulley. Moreover, such a CVT is susceptible
to clearance formation due to assembly defects or extensive continual operation of the system, which further degrades its
performance and leads to early wear and failure of the system. The present research focuses on developing models to understand
the influence of clearance and different friction characteristics on the dynamic performance of a chain CVT drive. A detailed
planar multibody model of a chain CVT is developed in order to accurately capture the dynamics characterized by the discrete
structure of the chain, which causes polygonal excitations in the system. A suitable model for clearance between the chain
links is embedded into this multibody model of the chain CVT. Friction between the chain link and the pulley sheaves is modeled
using different mathematical models which account for different loading scenarios. The mathematical models, the computational
scheme, and the results corresponding to different loading scenarios are discussed. The results discuss the influence of friction
characteristics and clearance parameters on the dynamic performance, the axial force requirements, and the torque transmitting
capacity of a chain CVT drive. 相似文献
13.
多体系统动力学微分/代数方程组的一类缩并算法 总被引:1,自引:0,他引:1
提出了多体系统动力学微分/代数组初值问题的一类缩并数值积分方法,首先通过矩阵正交分解法对增广系统转化为非超定系统,然后用Taylor展开法将其改写为可交替失代的格式,并用Newton迭代与差分修正求得系统响应,文末通过对平面二连杆操作手仿真验证了算法有有效性。 相似文献
14.
15.
16.
This paper presents a new methodology demonstrating the feasibility and advantages of a state-time formulation for dynamic simulation of complex multibody systems which shows potential advantages for exploiting massively parallel computing resources. This formulation allows time to be discretized and parameterized so that it can be treated as a variable in a manner similar to the system state variables. As a consequence of such a state-time discretization scheme, the system of governing equations yields to a set of loosely coupled linear-quadratic algebraic equations that is well-suited in structure for some families of nonlinear algebraic equations solvers. The goal of this work is to develop efficient multibody dynamics algorithm that is extremely scalable and better able to fully exploit anticipated immensely parallel computing machines (tera flop, peta flop and beyond) made available to it. 相似文献
17.
This paper addresses the application of quantum entanglement and cryptography for automation and control of dynamic systems.A dynamic system is a system where t... 相似文献
18.
Dong?Hwan?Choi Hong?Hee?YooEmail author 《Journal of Mechanical Science and Technology》2004,18(7):1086-1093
The modal characteristics of constrained multibody systems undergoing constant accelerated motions are investigated in this
paper. Relative coordinates are employed to derive the equations of motion, which are generally nonlinear in terms of the
coordinates. The dynamic equilibrium position of a constrained multibody system needs to be obtained from the nonlinear equations
of motion, which are then linearized at the dynamic equilibrium position. The mass and the stiffness matrices for the modal
analysis can be obtained from the linearized equations of motion. To verify the effectiveness and the accuracy of the proposed
method, two numerical examples are solved and the results obtained by using the proposed method are compared with those obtained
by analytical and other numerical methods. The proposed method is found to be accurate as well as effective in predicting
the modal characteristics of constrained multibody systems undergoing constant accelerated motions. 相似文献
19.
J. García de JalónAuthor Vitae A. CallejoAuthor Vitae 《Mechanism and Machine Theory》2011,46(2):168-182
Multibody dynamics discipline is so mature and has so many applications in the industry, that currently it is essential for mechanical engineering students to learn its basic theoretical foundations. However, universities cannot always integrate the matter as a standalone subject. This article presents an efficient methodology to teach kinematic and dynamic analysis of 3D multibody systems in courses with severe time constraints. A simple theoretical approach (the natural or fully Cartesian coordinates) and a high level programming language (MATLAB) are used. The theory level is shown with two examples: a closed-chain 3D robot and a McPherson car suspension system. Several real exam exercises at the end illustrate the skills acquired by the students in courses of 12 h of theory and 15 h of personal work. This methodology overcomes the limitation of time and the complexity of the issue, and turns out to be one of the simplest approaches to teach multibody systems theory in short graduate or undergraduate courses. 相似文献
20.