全文获取类型
收费全文 | 169篇 |
免费 | 21篇 |
国内免费 | 6篇 |
专业分类
电工技术 | 7篇 |
综合类 | 29篇 |
金属工艺 | 1篇 |
机械仪表 | 83篇 |
建筑科学 | 2篇 |
能源动力 | 18篇 |
武器工业 | 10篇 |
无线电 | 2篇 |
一般工业技术 | 28篇 |
冶金工业 | 1篇 |
自动化技术 | 15篇 |
出版年
2023年 | 1篇 |
2022年 | 3篇 |
2021年 | 5篇 |
2020年 | 5篇 |
2019年 | 4篇 |
2018年 | 5篇 |
2017年 | 4篇 |
2016年 | 9篇 |
2015年 | 9篇 |
2014年 | 21篇 |
2013年 | 22篇 |
2012年 | 18篇 |
2011年 | 19篇 |
2010年 | 15篇 |
2009年 | 6篇 |
2008年 | 8篇 |
2007年 | 5篇 |
2006年 | 10篇 |
2005年 | 8篇 |
2004年 | 5篇 |
2003年 | 8篇 |
2002年 | 1篇 |
2001年 | 3篇 |
2000年 | 1篇 |
1997年 | 1篇 |
排序方式: 共有196条查询结果,搜索用时 15 毫秒
1.
针对目前公交车传动系统匹配中存在的问题,提出了具体的优化方案。通过公交车市区道路实验,利用多元统计的相关理论获取城区公交车实际行驶循环工况,使用AVL-cruise软件建立了公交车整车仿真计算模型,并对模型及行驶循环的有效性进行了试验验证。在验证模型正确的前提下,通过模拟计算提出了车辆传动系统的优化匹配措施。 相似文献
2.
针对液压挖掘机在15s的一个典型工作周期下的工况,分析液压挖掘机的工况特点,建立并联式混合动力液压挖掘机动力源部分的数学模型,提出一种并联式混合动力液压挖掘机动力参数的优化组合配置,研究空间矢量脉宽调制(SVPWM)控制的永磁同步电机(PMSM)以及NiMH电池组在典型工作周期下的发电/电动、充电/发电能量转化效率、电机转速、转矩等动态响应特性以及SOC变化特性.仿真结果表明,该优化组合的动力总成能满足液压挖掘机动力需求和能量转化效率要求,能提升整机系统的油耗特性,并且电池系统只充当能量交互的媒介,实现液压挖掘机的高效节能的控制. 相似文献
3.
为了解决汽车动力总成悬置系统隔振问题,建立了某型号动力总成悬置系统的仿真模型.针对悬置系统无阻尼和有阻尼的情况,对支反力进行了对比分析;选取四个橡胶悬置的12个主方向刚度为设计变量,以动力总成悬置系统在各阶固有频率主振方向上的能量解耦程度为目标函数,利用Adams/Insight模块对动力总成悬置系统进行优化,结果显示优化后的悬置系统支反力明显降低,减小了动力总成振动的传递,解耦程度有了明显的提高,通过优化悬置系统的减振效果有了很大的改善. 相似文献
4.
The urgent need to meet increasingly tight environmental regulations and new fuel economy requirements has motivated system science researchers and automotive engineers to take advantage of emerging computational techniques to further advance hybrid electric vehicle and plug-in hybrid electric vehicle (PHEV) designs. In particular, research has focused on vehicle powertrain system design optimization, to reduce the fuel consumption and total energy cost while improving the vehicle's driving performance. In this work, two different natural optimization machines, namely the synchronous self-learning Pareto strategy and the elitism non-dominated sorting genetic algorithm, are implemented for component sizing of a specific power-split PHEV platform with a Toyota plug-in Prius as the baseline vehicle. To do this, a high-fidelity model of the Toyota plug-in Prius is employed for the numerical experiments using the Autonomie simulation software. Based on the simulation results, it is demonstrated that Pareto-based algorithms can successfully optimize the design parameters of the vehicle powertrain. 相似文献
5.
汽车动力传动系参数的模糊优化 总被引:7,自引:1,他引:7
以汽车整车动力性和燃油经济性的综合评价为基础,用二级模糊评价的方法,考虑到传动比、防止动力中断、地面附着力限制等约束的模糊性,以评价集上的距离为目标函数,建立了汽车动力传动系参数多目标模糊优化模型,并给出了此类优化问题的解法,最后以一个实例说明提出的模糊优化模型是可行的。 相似文献
6.
In order to improve the shift quality, a linear quadratic optimal tracking control algorithm for automatic transmission shift process is proposed. The dynamic equations of the shift process are derived using a Lagrange method. And a powertrain model is built in the Matlab/Simulink and verified by the measurements. Considering the shift jerk and friction loss during the shift process, the tracking trajectories of the turbine speed and output shaft speed are defined. Furthermore, the linear quadratic optimal tracking control performance index is proposed. Based on the Pontryagin's minimum principle, the optimal control law of the shift process is presented. Finally, the simulation study of the 1-2 upshift process under different load conditions is carried out with the powertrain model. The simulation results demonstrate that the shift jerk and friction loss can be significantly reduced by applying the proposed optimal tracking control method. 相似文献
7.
协同仿真是协同设计过程中的重要组成部分,成为检验、指导和优化设计的重要手段。车辆动力系统是一种典型的复杂机械产品。文章为解决协同仿真中复杂的交互通信问题,以动力系统为例,应用多Agent技术,研究复杂机械产品多Agent协同仿真的模型和方法。在分析了动力系统协同仿真的业务需求的基础上,提出了一种适合动力系统协同仿真的多Agent结构模型,Agent之间的通信方式采用KQML/XML,并以曲轴的静力学分析为例说明实现方法。 相似文献
8.
《钢铁冶炼》2013,40(4):254-257
AbstractThe automotive industry is changing with ever increasing speed. The current economic and environmental pressures mean that the vehicles of tomorrow will be very different to those we drive today. As new technologies are developed to enable these changes, the materials industry must respond quickly to ensure that they are both manufacturable and cost effective, as well as deliver the performance required to drive the industry forward. This article aims to identify the key technology developments, the challenges that they face and how Tata Steel is helping to overcome them. 相似文献
9.
Ahmad FadelBiao Zhou 《Journal of power sources》2011,196(6):3271-3279
The implementation of fuel cell vehicles requires a supervisory control strategy that manages the power distribution between the fuel cell and the energy storage device. Some of the current problems with power management strategies are: fuel efficiency optimization methods require prior knowledge of the driving cycle before they can be implemented, the impact on the fuel cell and battery life cycle are not considered and finally, there are no standardized measures to evaluate the performance of different control methods. In addition to that, the performances of different control methods for power management have not been directly compared using the same mathematical models. The proposed work will present a different optimization approach that uses fuel mass flow rate instead of fuel mass consumption as the cost function and thus, it can be done instantaneously and does not require knowledge of the driving cycle ahead of time. Also this study presents an experimental approach to validate the mathematical simulation results. 相似文献
10.
混合动力车辆动力系统建模与仿真 总被引:2,自引:0,他引:2
以并联式混合动力车辆为研究对象,基于MATLAB/Simulink软件,建立了发动机、电动机、蓄电池以及整车仿真模型,制定了整车控制策略.仿真结果表明,应用该策略对发动机与电机间的功率输出进行协调控制,能明显提高整车燃油经济性,并能够维持SOC在规定的工作区间变化. 相似文献