全文获取类型
收费全文 | 4417篇 |
免费 | 571篇 |
国内免费 | 404篇 |
专业分类
电工技术 | 777篇 |
技术理论 | 3篇 |
综合类 | 405篇 |
化学工业 | 252篇 |
金属工艺 | 232篇 |
机械仪表 | 963篇 |
建筑科学 | 189篇 |
矿业工程 | 63篇 |
能源动力 | 224篇 |
轻工业 | 44篇 |
水利工程 | 11篇 |
石油天然气 | 28篇 |
武器工业 | 103篇 |
无线电 | 542篇 |
一般工业技术 | 381篇 |
冶金工业 | 127篇 |
原子能技术 | 28篇 |
自动化技术 | 1020篇 |
出版年
2024年 | 33篇 |
2023年 | 94篇 |
2022年 | 116篇 |
2021年 | 166篇 |
2020年 | 186篇 |
2019年 | 178篇 |
2018年 | 167篇 |
2017年 | 205篇 |
2016年 | 235篇 |
2015年 | 277篇 |
2014年 | 323篇 |
2013年 | 338篇 |
2012年 | 253篇 |
2011年 | 291篇 |
2010年 | 259篇 |
2009年 | 276篇 |
2008年 | 230篇 |
2007年 | 327篇 |
2006年 | 284篇 |
2005年 | 242篇 |
2004年 | 179篇 |
2003年 | 154篇 |
2002年 | 111篇 |
2001年 | 107篇 |
2000年 | 106篇 |
1999年 | 54篇 |
1998年 | 52篇 |
1997年 | 40篇 |
1996年 | 21篇 |
1995年 | 27篇 |
1994年 | 15篇 |
1993年 | 13篇 |
1992年 | 9篇 |
1991年 | 8篇 |
1990年 | 4篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1982年 | 1篇 |
排序方式: 共有5392条查询结果,搜索用时 15 毫秒
101.
Xiaojun Ban 《International journal of systems science》2016,47(15):3646-3655
In this paper, the control problem for a class of linear parameter varying (LPV) plant subject to actuator saturation is investigated. For the saturated LPV plant depending on the scheduling parameters in linear fractional transformation (LFT) fashion, a gain-scheduled output feedback controller in the LFT form is designed to guarantee the stability of the closed-loop LPV system and provide optimised disturbance/error attenuation performance. By using the congruent transformation, the synthesis condition is formulated as a convex optimisation problem in terms of a finite number of LMIs for which efficient optimisation techniques are available. The nonlinear inverted pendulum problem is employed to demonstrate the effectiveness of the proposed approach. Moreover, the comparison between our LPV saturated approach with an existing linear saturated method reveals the advantage of the LPV controller when handling nonlinear plants. 相似文献
102.
This paper focuses on the optimal robust reliable H∞ control for a class of uncertain nonlinear systems with actuator faults. A new method of annihilating uncertain matrix is proposed. Based on this approach, a new method of disposing of the phenomenon of uncertain matrices multiplication is provided. In accordance with the method, the optimal robust reliable H∞ control problem for uncertain nonlinear systems is settled by employing state feedback, in terms of linear matrix inequality (LMI). Finally, two illustrative examples are given to show the feasibility and validity of the proposed method. 相似文献
103.
104.
Dynamic output feedback control of saturated switched delay systems under the PDT switching
下载免费PDF全文
![点击此处可从《国际强度与非线性控制杂志<br>》网站下载免费的PDF全文](/ch/ext_images/free.gif)
This paper is devoted to saturated control of switched delay systems. The main focus is to find a suitable switching law and saturated output feedback controllers such that the closed‐loop systems are asymptotically stable and have the disturbance tolerance/rejection capacity. A mixed slow/arbitrary switching approach, so‐called persistent dwell time (PDT) switching, is used to design the switching law. Compared with the slow switching, it is more general and leads to more flexibility in the process of constructing switching signals. More importantly, the proposed PDT is dependent on state delay, which includes the previous delay‐independent PDT. Next, time‐varying ellipsoids and a prescribe l2‐gain are introduced to characterize the disturbance tolerance and rejection capacities of systems, respectively. Based on the proposed results, the relation between delay‐dependent PDT and level of disturbance tolerance/rejection is shown. Finally, saturated controllers working in time‐varying hull controllable regions are designed. Thus, the considered problem is solved. An example is exploited to illustrate the effectiveness of the proposed results. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
105.
106.
提出了配置完整性的概念,用来表征单向执行器系统控制作用的生成能力.并且将
配置完整性归结为线性方程组正解的存在性问题,给出了配置矩阵完整性的若干性质和判
别条件及其相应的判别步骤. 相似文献
107.
108.
Green sand moulding machines for cast iron foundries are presently unable to uniquely identify individual castings. An insert tool concept is developed and tested via incremental mock-up development. The tool is part of the pattern plate and changes shape between each moulding, thus giving each mould a unique ID by embossing a Data Matrix symbol into the sand. In the process of producing the mould, each casting can be given a unique (DPM), enabling part tracking throughout the casting's life cycle. Sand embossing is achieved with paraffin-actuated reconfigurable pin-type tooling under simulated processing conditions. The marker geometry limitations have been tested using static symbol patterns, both for sand embossing and actual casting marking. The marked castings have successfully been identified with decoding software. The study shows that the function of each element of this technology can be successfully applied within the foundry industry. 相似文献
109.
Zheng Li 《哈尔滨工业大学学报(英文版)》2013,20(2):99-105
This paper mainly presents a PM multi-DOF actuator for robot in-wheels drive applications and its control method. The torque model is established based on the finite-element model of the single pair poles in 3D finite element method software. Due to the special structure of the actuator, the Euler angles are adopted for deriving the kinematics and dynamic model. To reduce the effects of uncertainties of modeling error, nonlinear friction and external disturbances in the system, an approximation of neural network adaptive control method is applied to the actuator. The computation and simulation results show that the proposed analysis and control method can effectively derive the characteristics and improve the motion performance, which provides the primary theoretical guide for the configuration design, optimization and control research of multi-DOF deflection type actuators. 相似文献
110.
根据EMB执行器的结构特点和力学特性,分别建立EMB执行器的电机模型、刚度模型、摩擦力模型和运动微分方程,并设计EMB执行器的控制器,最后将各个部分结合起来建立EMB执行器的数学模型并进行仿真分析。用软件编程实现设计好的控制器,并进行硬件在环实验,实验结果与仿真结果十分接近。 相似文献