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车联网中车载网络负载与线束优化 被引量:2
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作者 何长伟 杨殿阁 +1 位作者 张涛 连小珉 《汽车技术》 北大核心 2014年第9期1-4,共4页
基于车载分布式智能网络架构,运用独立协调机制,使用状态协调表协调汽车电器状态,建立了完整的车载分布式独立协调智能网络。进一步推导出车载网络负载的约束规划条件,运用回溯法求取最优负载。基于最优化控制建立了车载网络线束的目标... 基于车载分布式智能网络架构,运用独立协调机制,使用状态协调表协调汽车电器状态,建立了完整的车载分布式独立协调智能网络。进一步推导出车载网络负载的约束规划条件,运用回溯法求取最优负载。基于最优化控制建立了车载网络线束的目标函数与约束方程,运用变分法推导出了线束优化的极值条件。通过车载网络样车改造,设计实车试验,验证了该方法的有效性。 展开更多
关键词 车联网 车载网络 负载优化 线束优化
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电动叉车的线束优化设计
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作者 赵龙 《汽车电器》 2023年第5期43-45,共3页
叉车线束是整车电气的重要组成部分之一,是电动叉车信号传输、能量传递、指令控制的桥梁和纽带。本文从叉车线束耐热、防水性、整车布局、材料选型4个角度出发,以工艺品质评审结果为导向,以车辆运行实际表现为依据,以客户使用满意度为目... 叉车线束是整车电气的重要组成部分之一,是电动叉车信号传输、能量传递、指令控制的桥梁和纽带。本文从叉车线束耐热、防水性、整车布局、材料选型4个角度出发,以工艺品质评审结果为导向,以车辆运行实际表现为依据,以客户使用满意度为目标,进行现场试验和设计改良。结果表明:通过以上4个方面的优化改进,叉车线束布局整洁美观,电气故障产生概率明显降低。 展开更多
关键词 线束优化 防水性 线束布局
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混凝土泵车线束优化设计 被引量:2
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作者 王俊兰 刘来 +4 位作者 万林林 辛美燕 王旭 肖长江 刘耀诚 《建筑机械化》 2019年第10期34-36,共3页
通过混凝土泵车线束架构优化设计,利用Pro-e三维布线优化线束走向,就近布置线束,在线束连接处采用防水连接器及专用电气盒,同时使用专用固线装置进行线束固定,优化设计混凝土泵车线束,以实现线束独立布线,节约成本,提高线束的维修性。
关键词 混凝土泵车 线束优化 三维布线 独立布线 成本节约
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浅析现代汽车电工线束修理及优化技术
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作者 邓华忠 《福建冶金》 2011年第4期44-46,43,共4页
汽车线束素有汽车神经之称.其编成的形式由电线、接插件和传感器以及其他器件组成。是对汽车进行电信号控制的载体。只有掌握规范的修理汽车线束修理技术才能有效解决汽车各种电路故障。本文对汽车线束的修理和优化进行了介绍。
关键词 汽车维修 线束修理 线束优化
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叉车线束的优化设计
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作者 赵龙 《汽车电器》 2023年第6期88-90,共3页
叉车线束在实际装配过程中的问题较多,装错、线束损坏/烧蚀、整车布线凌乱等状况经常发生。同时,叉车线束的成本在所有车用电器中占有很大比重,出现问题就损失严重。本文从线束走向的优化、常用功能集成到车架线束、发散式设计改成阶梯... 叉车线束在实际装配过程中的问题较多,装错、线束损坏/烧蚀、整车布线凌乱等状况经常发生。同时,叉车线束的成本在所有车用电器中占有很大比重,出现问题就损失严重。本文从线束走向的优化、常用功能集成到车架线束、发散式设计改成阶梯式、不常用功能单独做过渡线实现、发散式改成先集中后分散方式5个方面出发,对线束进行优化设计改进,结果表明:优化后的设计可以简化线路和装配流程,减少物料种类,降低管理成本。 展开更多
关键词 线束优化 集成化设计 阶梯式设计
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叉车电器的防错及优化设计
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作者 赵龙 李伟 +3 位作者 崔慎兆 刘秋华 张亚鹏 张桂林 《汽车电器》 2023年第2期59-61,65,共4页
针对目前电动叉车整车制造过程中出现的装配困难和装配错误等问题,本文从车架线束优化设计、结构设计优化、物料选型3个方面出发,采取不同措施降低装配难度,避免装配错误情况的发生。事实证明,通过以上3个方面的优化,叉车装配的难度降低... 针对目前电动叉车整车制造过程中出现的装配困难和装配错误等问题,本文从车架线束优化设计、结构设计优化、物料选型3个方面出发,采取不同措施降低装配难度,避免装配错误情况的发生。事实证明,通过以上3个方面的优化,叉车装配的难度降低,错误率大大减少。 展开更多
关键词 车架线束优化 防错 优化设计
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盯紧“第一信号”构建最优成本——一汽-大众公司降成本纪实
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作者 吉男 《企业研究》 2003年第7期16-18,共3页
年初以来,国产轿车市场竞争日趋激烈,预计全年将有40余款新车面市,仅一季度就推出十余款新车,诸多车型进行了价格调整。与此同时,欧元汇率一涨再涨,公司面临相当大的压力。一汽-大众要实现26万辆的产销目标,必须具备成本竞争力。
关键词 一汽-大众公司 最优成本 宝来ABS 毛坏国产化 线束优化 CKD 包装费
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CEE-Gr:A Global Router with Performance Optimization Under Multi-Constraints
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作者 张凌 经彤 +3 位作者 洪先龙 许静宇 XiongJinjun HeLei 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2004年第5期508-515,共8页
A global routing algorithm with performance optimization under multi constraints is proposed,which studies RLC coupling noise,timing performance,and routability simultaneously at global routing level.The algorithm is... A global routing algorithm with performance optimization under multi constraints is proposed,which studies RLC coupling noise,timing performance,and routability simultaneously at global routing level.The algorithm is implemented and the global router is called CEE Gr.The CEE Gr is tested on MCNC benchmarks and the experimental results are promising. 展开更多
关键词 VLSI/ULSI physical design global routing multi constraints performance optimization
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Feasible SQP Descent Method for Inequality Constrained Optimization Problems and Its Convergence 被引量:1
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作者 张和平 叶留青 《Chinese Quarterly Journal of Mathematics》 CSCD 2009年第3期469-474,共6页
In this paper,the new SQP feasible descent algorithm for nonlinear constrained optimization problems presented,and under weaker conditions of relative,we proofed the new method still possesses global convergence and i... In this paper,the new SQP feasible descent algorithm for nonlinear constrained optimization problems presented,and under weaker conditions of relative,we proofed the new method still possesses global convergence and its strong convergence.The numerical results illustrate that the new methods are valid. 展开更多
关键词 nonlinearly constrained optimization SQP the generalized projection line search global convergence strong convergence.
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Shape modification of Bézier curves by constrained optimization
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作者 吴庆标 夏飞海 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2005年第B08期124-127,共4页
The Bézier curve is one of the most commonly used parametric curves in CAGD and Computer Graphics and has many good properties for shape design. Developing more convenient techniques for designing and modifying B... The Bézier curve is one of the most commonly used parametric curves in CAGD and Computer Graphics and has many good properties for shape design. Developing more convenient techniques for designing and modifying Bézier curve is an im- portant problem, and is also an important research issue in CAD/CAM and NC technology fields. This work investigates the optimal shape modification of Bézier curves by geometric constraints. This paper presents a new method by constrained optimi- zation based on changing the control points of the curves. By this method, the authors modify control points of the original Bézier curves to satisfy the given constraints and modify the shape of the curves optimally. Practical examples are also given. 展开更多
关键词 Shape modification Bézier curve Constrained optimization
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An optimal on-site calibration method in measurement system of dynamic envelope curve of high-speed vehicle
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作者 LIU Meng LIU Chang-jie WU Xiao-han 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2016年第4期398-404,共7页
High-speed vehicle dynamic envelope curve is defined as the maximum limit outline affected by a variety of adverse factors while the train is running. Considering the difficulties in the current measurement system suc... High-speed vehicle dynamic envelope curve is defined as the maximum limit outline affected by a variety of adverse factors while the train is running. Considering the difficulties in the current measurement system such as complicated calibration process,cumbersome aided-instruments,strict limitation of working distance, this paper carries out an optical method in which two high-speed cameras with variable-zoom lenses are adopted as binocular stereo sensors of measurement system and a high-ac-curacy 3D target with fast reconstruction is designed. The intrinsic parameters of the sensors and the relative positions between coordinate systems are solved by the method of colinearity constrained optimization algorithm. The calibration process is easy to operate and the device is also of portability. Most importantly, the severe working distance limitation between sensors and measured body is solved, enhancing the adaptability of measurement system to environment. Experimental results show that when the sensors are in the range of 8 -16 m away from the measured body, system accuracy can reach up to ±0. 5 mm, which meets the requirements to measure the dynamic envelope curve of high-speed vehicle. 展开更多
关键词 zoom lens 3D target colinearity constrain optimization algorithm binocular stereo vision dynamic envelope curve
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An Improved Control Vector Iteration Approach for Nonlinear Dynamic Optimization. II. Problems with Path Constraints 被引量:1
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作者 胡云卿 刘兴高 薛安克 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第2期141-145,共5页
This paper considers dealing with path constraints in the framework of the improved control vector iteration (CVI) approach. Two available ways for enforcing equality path constraints are presented, which can be dir... This paper considers dealing with path constraints in the framework of the improved control vector iteration (CVI) approach. Two available ways for enforcing equality path constraints are presented, which can be directly incorporated into the improved CVI approach. Inequality path constraints are much more difficult to deal with, even for small scale problems, because the time intervals where the inequality path constraints are active are unknown in advance. To overcome the challenge, the ll penalty function and a novel smoothing technique are in-troduced, leading to a new effective approach. Moreover, on the basis of the relevant theorems, a numerical algo-rithm is proposed for nonlinear dynamic optimization problems with inequality path constraints. Results obtained from the classic batch reaCtor operation problem are in agreement with the literature reoorts, and the comoutational efficiency is also high. 展开更多
关键词 nonlinear dynamic optimization control vector iteration path constraint penalty function method
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Optimizing Utility of Cognitive Radio Ad Hoc Networks under the Energy and Retransmission Constraint
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作者 FENG Guangsheng ZHAO Qian +3 位作者 WANG Huiqiang LV Hongwu Lin JUNYU MA Chunguang 《China Communications》 SCIE CSCD 2014年第A01期148-155,共8页
In Cognitive radio ad hoc networks (CRAHNs), the secondary users (SUs) or cognitive radio nodes (CRs) are always equipped with limited energy and have a high error probability of data transmission. To address th... In Cognitive radio ad hoc networks (CRAHNs), the secondary users (SUs) or cognitive radio nodes (CRs) are always equipped with limited energy and have a high error probability of data transmission. To address this issue, we first describe the network utility under energy constraint as a max-min model, where the re-transmission strategy with network coding is employed. Additionally, the expression of retransmission probability is presented in terms of power and bit error rate (BER). Moreover, since the max-min model is non-convex in both objective and constraints, we use a normal- form game to find a near-optimal solution. The simulation results show that the proposed approach could achieve a higher network utility than the compared approaches. 展开更多
关键词 cognitive radio ad hoc networks retransmission probability
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A Trust-region Algorithm for Nonlinear Constrained Optimization Problem
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作者 童小娇 周叔子 《Journal of Mathematical Research and Exposition》 CSCD 北大核心 2004年第3期445-460,共16页
This paper presents a new trust-region algorithm for general nonlinear constrained optimization problems. Certain equivalent KKT conditions of the problems are derived. Global convergence of the algorithm to a first-o... This paper presents a new trust-region algorithm for general nonlinear constrained optimization problems. Certain equivalent KKT conditions of the problems are derived. Global convergence of the algorithm to a first-order KKT point is established under mild conditions on the trial steps. Numerical example is also reported. 展开更多
关键词 nonlinear constrained optimization trust-region method global convergence.
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A LINE SEARCH FILTER SECANT METHOD FOR NONLINEAR EQUALITY CONSTRAINED OPTIMIZATION 被引量:3
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作者 Zhujun WANG Detong ZHU 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2010年第2期343-361,共19页
This paper formulates and analyzes a line search method for general nonlinear equalityconstrained optimization based on filter methods for step acceptance and secant methods for searchdirection.The feature of the new ... This paper formulates and analyzes a line search method for general nonlinear equalityconstrained optimization based on filter methods for step acceptance and secant methods for searchdirection.The feature of the new algorithm is that the secant algorithm is used to produce a searchdirection,a backtracking line search procedure is used to generate step size,some filtered rules areused to determine step acceptance,second order correction technique is used to reduce infeasibility andovercome the Maratos effect.Global convergence properties of this method are analyzed:under mildassumptions it is showed that every limit point of the sequence of iterates generated by the algorithmis feasible,and that there exists at least one limit point that is a stationary point for the problem.Moreover,it is also established that the Maratos effect can be overcome in our new approach by addingsecond order correction steps so that fast local superlinear convergence to a second order sufficient localsolution is achieved.Finally,the results of numerical experiments are reported to show the effectivenessof the line search filter secant method. 展开更多
关键词 Filter method nonlinear programming secant algorithm second order correction.
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GLOBAL CONVERGENCE PROPERTIES OF THREE-TERM CONJUGATE GRADIENT METHOD WITH NEW-TYPE LINE SEARCH 被引量:13
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作者 WANGChangyu DUShouqiang CHENYuanyuan 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2004年第3期412-420,共9页
In this paper, a new Wolfe-type line search and a new Armijo-type line searchare proposed, and some global convergence properties of a three-term conjugate gradient method withthe two line searches are proved.
关键词 unconstrained optimization line search three-term conjugate gradientmethod global convergence
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A Dwindling Filter Line Search Algorithm for Nonlinear Equality Constrained Optimization 被引量:2
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作者 GU Chao ZHU Detong 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2015年第3期623-637,共15页
This paper proposes a dwindling filter line search algorithm for nonlinear equality constrained optimization. A dwindling filter, which is a modification of the traditional filter, is employed in the algorithm. The en... This paper proposes a dwindling filter line search algorithm for nonlinear equality constrained optimization. A dwindling filter, which is a modification of the traditional filter, is employed in the algorithm. The envelope of the dwindling filter becomes thinner and thinner as the step size approaches zero. This new algorithm has more flexibility for the acceptance of the trial step and requires less computational costs compared with traditional filter algorithm. The global and local convergence of the proposed algorithm are given under some reasonable conditions. The numerical experiments are reported to show the effectiveness of the dwindling filter algorithm. 展开更多
关键词 CONVERGENCE dwindling filter line search nonlinear optimization secant update.
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A TRUST REGION ALGORITHM WITH NULL SPACE TECHNIQUE FOR EQUALITY CONSTRAINED OPTIMIZATION 被引量:2
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作者 TONGXiaojiao LIDonghui 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2004年第1期54-63,共10页
This paper presents a trust region algorithm with null space technique fornonlinear equality constrained optimization. Considering in the null space methods that,the convergent rate of range space step is faster than ... This paper presents a trust region algorithm with null space technique fornonlinear equality constrained optimization. Considering in the null space methods that,the convergent rate of range space step is faster than the null space step for the most cases,the proposed algorithm computes null steps more often than range space step. Moreover,the new algorithm is based on the reduced Hessian SQP method. Global convergence ofthe proposed algorithm is proved. The effectiveness of the method is demonstrated bysome numerical examples. 展开更多
关键词 trust region method null space technique equality constrained optimization global convergence
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A Dwindling Filter Algorithm with a Modified Subproblem for Nonlinear Inequality Constrained Optimization 被引量:2
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作者 Chao GU Detong ZHU 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 2014年第2期209-224,共16页
The authors propose a dwindling filter algorithm with Zhou's modified subproblem for nonlinear inequality constrained optimization.The feasibility restoration phase,which is always used in the traditional filter m... The authors propose a dwindling filter algorithm with Zhou's modified subproblem for nonlinear inequality constrained optimization.The feasibility restoration phase,which is always used in the traditional filter method,is not needed.Under mild conditions,global convergence and local superlinear convergence rates are obtained.Numerical results demonstrate that the new algorithm is effective. 展开更多
关键词 Modified subproblem Dwindling filter Feasibility restoration phase CONVERGENCE Constrained optimization
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THE CONVERGENCE OF A NEW MODIFIED BFGS METHOD WITHOUT LINE SEARCHES FOR UNCONSTRAINED OPTIMIZATION OR COMPLEXITY SYSTEMS
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作者 Liying LIU Zengxin WEI Xiaoping WU 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2010年第4期861-872,共12页
In this paper,a new modified BFGS method without line searches is proposed.Unlike traditionalBFGS method,this modified BFGS method is proposed based on the so-called fixed steplengthstrategy introduced by Sun and Zhan... In this paper,a new modified BFGS method without line searches is proposed.Unlike traditionalBFGS method,this modified BFGS method is proposed based on the so-called fixed steplengthstrategy introduced by Sun and Zhang.Under some suitable assumptions,the global convergence andthe superlinear convergence of the new algorithm are established,respectively.And some preliminarynumerical experiments,which shows that the new Algorithm is feasible,is also reported. 展开更多
关键词 BFGS method complexity systems global convergence superlinear convergence unconstrained optimization.
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