一种诊断策略优化的多维目标泛深度搜索算法

传统的诊断策略搜索算法,存在计算复杂度高或者精度低,最优测试集单调等缺点,针对这些问题,通过结合多目标优化理论和准深度搜索算法的优点,提出了一种新的多维目标泛深度搜索算法。该方法能够根据目标要求调整最优测试集和测试序列,从而有效提高测试性指标,并降低计算复杂度。给出了算法实现的主要步骤,并通过对多个案例结果的分析证明了方法的有效性。该搜索算法对于诊断策略的研究及工程实践具有借鉴意义。     

车辆起步加速驾驶性客观评价及优化

为实现车辆起步加速过程驾驶性客观评价和优化的需求,通过对实际客户驾驶行为大数据样本的分析,构造了基于客户体验的起步加速客观测试评价工况.将起步加速工况进行了驾驶性特征提取和细分.并从响应性、平顺性、收敛性和风格等方面对客观评价指标进行了设计.通过对竞品驾驶性的测试和指标分析,获得了驾驶性评价指标以及驾驶性正向设计需求....     

整车内饰背光测试方法介绍

整车内饰背光的主要作用是为驾驶员夜间行驶提供信息照明,而照明的目的是识别对象、提升品质及夜间行驶安全。本文结合人们对不同颜色光的视觉感知,阐述整车内饰背光主观评价及客观测试方法,重点介绍客观测试方法。     

Route Selection for Railway Passengers: A Multi-objective Model and Optimization Algorithm

With an increased operating speed in Chinese railways in recent years, the number of passengers traveling by trains has been significantly increasing. The research issue is regarding how passengers select their routes when there are no direct trains. Previous studies have dealt with the route selection problem as a multi-objective optimization. The study began by setting up a transportation network which encompasses the departure and terminal stations along with important intermediate stations. Then, six key factors are analyzed and formulated using a multi-objective model, consisting of the train-running time, railway fare, transfer frequencies, distances between transfer stations, transfer interval time, and travel comfort. Furthermore, a two-phase algorithm is employed to solve the model. A rapid searching algorithm for feasible routes based on the train timetable is established, then the weight vector is assigned by introducing the information entropy to obtain satisfied routes. In the end, the two-phase algorithm is tested respectively for railway passengers from Lanzhou to Beijing (with direct trains) and from Lanzhou to Changchun (without direct trains), and the results show that the proposed model and solution algorithm are efficient for obtaining satisfactory routes.     

客观对应物与新诗戏剧化--论九叶诗派在技术层面上的诗学探求

九叶诗派从西方现代派大师那里得到重要的启示，提出“客观对应物”和新诗“戏剧化”作为开展现代诗学理论技术层面的有益探讨。现代诗中的“客观对应物”，在于扩大并复杂化了人类的感觉能力，而引入新诗“戏剧化”，就能有效规避当时诗坛流行的“直接的叙述或说明”诗歌的流弊。在具体的技术操作层面上，有“诗的扩展”和“诗的结晶”两种不同的方式。就新诗“戏剧化”类型而言，有内向式、外向式和诗剧三种。     

综合法初定斜拉桥合理成桥状态

以某顶推施工独塔斜拉桥钢箱梁为背景,在斜拉桥各种设计理论的基础上,提出了一种更适合于钢箱梁斜拉桥的索力优化方法。采用最小弯曲能量法初定成桥状态,力平衡法确定主梁的弯矩可行域,作为进一步约束优化的约束条件,从而得到斜拉桥各部件受力合理的成桥状态。     

Objectification of steering feel around straight-line driving for vehicle/tyre design

This paper presents the objectification techniques for the assessment of steering feel including {on-centre} feel and steering response by measurement data. Here, new objective parameters are developed by considering not only the process by which the steering feel is evaluated subjectively but also by the ergonomic perceptive sensitivity of the driver. In order to validate such objective parameters, subjective tests are carried out by professional drivers. Objective measurements are also performed for several cars at a proving ground. The linear correlation coefficients between the subjective ratings and the objective parameters are calculated. As one of new objective parameters, steering wheel angle defined by ergonomic perception sensitivity shows high correlation with the subjective questionnaires of on-center responses. Newly defined steering torque curvature also shows high correlation with the subjective questionnaires of on-center effort. These correlation results conclude that the subjective assessment of steering feel can be successfully explained and objectified by means of the suggested objective parameters.     

基于舒适性和轮胎动载的车辆悬架参数优化

为了改善汽车行驶的舒适性并减小轮胎对路面的动载，以某载货汽车为研究对象，建立了多目标优化模型，并采用统一目标函数法对车辆悬架参数进行优化。优化结果表明：优化后悬架刚度减小而阻尼增大，且前悬架参数变化较小，后悬架参数变化较大；相比于优化前，车身垂直方向加速度均方根值减小了20％，前轮动栽均方根值减小了40％，后轮变化更显著，减小了49％；采用多目标优化设计方法不仅可提高车辆自身的舒适性，而且可减小轮胎对路面的动载。     

基于目标—评价分析的公路网规划方法

针对现阶段中国公路规划的特点,以目标－评价为核心的综合规划方法根据规划区域经济、交通、资源条件的综合分析,确定网络规划的目标,糅合现有几种规划方法的优点,建立以规划目标引导设施规划、以规划目标实现程度为核心进行综合评价的技术路线;以交通量预测为基础、主案评价为依据,采用规划目标指导下的规模确定－网络布局－线路规划－节点规划多层次渐进的综合规划方法,以上海高速公路和干线公路网规划为实例,重点介绍了规划技术过程,规划目标,网络布局原则 和技术评价体系。     

高速列车运行调整与运行控制一体化双目标优化模型与算法

列车实时运行调整与运行控制是实现高速列车准点节能运行的两个重要方面.本文构建高速列车运行调整与运行控制一体化优化模型，以降低列车总延误时间与运行能耗为目标，同时优化列车速度距离与时间距离曲线.与以往研究将列车运行调整与运行控制独立优化不同，本文基于列车牵引计算，通过锁闭时间理论将列车运行调整与控制的解空间进行耦合，根据列车运行速度、制动性能、信号系统的清空与开放时间、轨道区段/闭塞分区的长度等因素，精细化计算列车占用不同轨道区段/闭塞分区的时间，动态确定列车区间运行时分与追踪间隔.为求解复杂的非线性模型，设计分段近似法将非线性约束进行重构，从而将非线性优化模型转变为混合整数规划模型.通过算例计算，给出双目标问题的帕累托解集，与单目标优化方法对比，本文方法可以减少总能耗2.46%，降低运行总延误7.33%.