Kinematic design of double-wishbone suspension systems using a multiobjective optimisation approach

This paper is focused on the kinematic design of double-wishbone suspension systems in vehicles, which is tackled using a multiobjective dimensional synthesis technique. The synthesis goal is to optimise an RSSR–SS linkage, subject to some constraints involved in the dynamic behaviour of vehicles. The synthesis method is based on gradient determination using exact differentiation to obtain the elements in the Jacobian matrix. These characteristics make the method adapt well to the optimum design of vehicle suspension systems. The method is capable of handling equality and inequality constraints, thus, the usual ranges of values may be imposed on the functional parameters. The formulation presented is easy to implement and the solutions obtained demonstrate the accuracy and robustness of the method.     

预应力混凝土斜拉桥调索设计新方法

综合分析了当前各主要调索方法的流程及利弊后,指出了分阶段施工的悬臂浇筑预应力混凝土斜拉桥内力状态无法逼近一次合理成桥状态,进而提出预应力混凝土悬臂浇筑斜拉桥可不进行合理成桥状态分析,直接考虑施工阶段进行正装调索设计的新理念。     

A time-dependent freight tour synthesis model

This paper introduces a model of urban freight demand that seeks to estimate tour flows from secondary data sources e.g., traffic counts, to bypass the need for expensive surveys. The model discussed in this paper, referred as Freight Tour Synthesis (FTS), enhances current techniques by incorporating the time-dependent tour-based behavior of freight vehicles, and the decision maker’s (e.g., metropolitan planning agency planner) preferences for different sources of information. The model, based on entropy maximization theory, estimates the most likely set of tour flows, given a set of freight trip generation estimates, a set of traffic counts per time interval, and total freight transportation cost in the network. The type of inputs used allows the assessment of changes in infrastructure, policy and land use. The ability of the model to replicate actual values is assessed using the Denver Region (CO) as a case study.     

不同船体构造形式在波浪载荷下的结构性能比较

船体结构形式不同,直接影响船体的结构性能和运动性能。文章针对五种船体构造形式,即:单板横向加筋、单板纵向加筋、单板双向加筋、硬壳式和夹层式这五种不同结构的船体在外载相同、质量相等的条件下进行应力与变形分析,以比较各种结构的响应和性能,为结构选型提供数值分析依据。分析考虑了静载与波浪载荷的叠加,并进行了准静态处理。通过计算和综合性能比较,挑选出既符合结构性能,又能满足使用要求的结构形式。     

一种雷达信号的综合分选方法

现代战场电磁信号环境日益复杂,仅某一种算法不能准确地分选雷达信号。文章提出了一种结合序列差值直方图算法和改进的PRI变换法的综合分选方法来估计脉冲重复间隔。仿真结果表明在复杂的信号环境中可以对雷达脉冲信号实时地进行准确分选。     

基于AHP法的潜射鱼雷性能模糊评估

将层次分析法（AHP）与模糊评估法有机结合。首先依据专家评判法建立了潜射鱼雷性能评估分层指标,并根据每层中各指标因素的重要程度而分别赋予相应的权重向量。运用结合层次分析的模糊综合评判算法建立了潜射鱼雷性能综合评估模型,在该模型基础上进行具体应用分析。     

简支梁桥在车辆荷载作用下空间振动特性分析

以福新桥为背景,分析了车道位置、桥面铺装层平整度、车速等因素对桥梁动力响应的影响,并对桥面动力响应频谱特征进行分析,得到一些结论,可为进一步研究公路车桥耦合振动提供参考。     

同伦迭代法的研究及其应用于机构学问题的求解

通过分析多项式映射同伦函数零点集的特性，提出了一种改进路径跟踪方案的同伦迭代方法，并论证了同伦迭代法求解非线性多项式方程组的可行性和可靠性，说明了该方法解高亏欠度多项式方程组时具有很高的计算效率。给出的机构学问题的数值实例说明了该同伦迭代法的有效性和可靠性。     

新型固态胺二氧化碳吸收剂的制备及性能

采用丙烯酸酯类为单体,二乙烯苯为交联剂,悬浮聚合制备大孔交联共聚物基质,胺解制备了一种新型固态胺二氧化碳吸收剂一聚丙烯酰多乙烯多胺型树脂,研究了单体种类、功能基结构和含量、胺解条件等对树脂吸收二氧化碳性能的影响.模拟条件试验表明,该树脂吸收二氧化碳活性高,寿命长.     

Synthesis of Stephenson Ⅲ Six-Link Mechanism for Function Generation Using an Improved Homotopy Method

This paper presents solutions to the function generation problems of Stephenson Ⅲ six-link mechanism with the maximum precision positions for the first time using homotopy method with an improved path-tracking scheme. The new path-tracking scheme is based on the characteristics of the zero sets of homotopy function for polynomial mapping and thus the tracking speed is dramatically increased.