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Novel Evaluation Method of Vehicle Suspension Performance Based on Concept of Wheel Turn Center

Chinese Journal of Mechanical Engineering 2015年第5期28卷 935-944页

作者： WANG Bo guan hsin LU Pingping ZHAN Jun State Key Laboratory of Automobile Simulation and Control Jilin University

The current research of suspension performance evaluation is mixed in the evaluation of vehicle handling and ride comfort. However, it is lack of a direct and independent evaluation method for suspension performance. In this paper, a novel wheel turn center method is proposed to evaluate the suspension performance. This method is based on the concept and application of wheel turn center （WTC） and sprung mass turn center （SPTC）. The vehicle body and each wheel are regarded to be independent rigid bodies and have their own turn centers which reflect respective steering motions and responses. Since the suspension is the link between vehicle body and wheels, the consistence between the sprung mass turn center and the wheel turn center reflects the effect and performance of the suspension system. Firstly, the concept and appropriate calculation method of WTC and SPTC are developed. Then the degree of inconsistence between WTC and SPTC and the time that they achieve consistence, when the vehicle experiences from transient steering to steady steering state, are proposed to evaluate suspension performance. The suspension evaluation tests are conducted under different vehicle velocities and lateral accelerations by using CarSim software. The simulation results show that the inconsistence of steering motion between vehicle body and wheels are mainly at high speeds and low lateral accelerations. Finally, based on the proposed evaluation indexes, the influences of different suspension characteristic parameters on suspension performance and their matches to improve steering coordination are discussed. The proposed wheel turn center method provides a guidance and potential application for suspension evaluation and optimization.

关键词： suspension evaluation wheel turn center sprung mass turn center

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Identification of Maximum Road Friction Coefficient and Optimal Slip Ratio Based on Road Type Recognition

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Chinese Journal of Mechanical Engineering 2014年第5期27卷 1018-1026页

作者： guan hsin WANG Bo LU Pingping XU Liang State Key Laboratory of Automotive Simulation and Control Jilin University

The identification of maximum road friction coefficient and optimal slip ratio is crucial to vehicle dynamics and ***,it is always not easy to identify the maximum road friction coefficient with high robustness and good adaptability to various vehicle operating *** existing investigations on robust identification of maximum road friction coefficient are *** this paper,an identification approach based on road type recognition is proposed for the robust identification of maximum road friction coefficient and optimal slip *** instantaneous road friction coefficient is estimated through the recursive least square with a forgetting factor method based on the single wheel model,and the estimated road friction coefficient and slip ratio are grouped in a set of samples in a small time interval before the current time,which are updated with time *** current road type is recognized by comparing the samples of the estimated road friction coefficient with the standard road friction coefficient of each typical road,and the minimum statistical error is used as the recognition principle to improve identification *** the road type is recognized,the maximum road friction coefficient and optimal slip ratio are *** numerical simulation tests are conducted on two typical road friction conditions（single-friction and joint-friction）by using CarSim *** test results show that there is little identification error between the identified maximum road friction coefficient and the pre-set value in *** proposed identification method has good robustness performance to external disturbances and good adaptability to various vehicle operating conditions and road variations,and the identification results can be used for the adjustment of vehicle active safety control strategies.

关键词： maximum road friction coefficient optimal slip ratio road type recognition recursive least square

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Research of Driver Optimal Preview Acceleration Integrated Decision Model

Research of Driver Optimal Preview Acceleration Integrated D...

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第一届工程科学与力学中的计算方法国际会议

作者： hsin guan Jinlin University State Key Laboratory of Automobile Dynamic Simulation130025ChangchunChina

＜正＞Research of driver model is not only important to study of vehicle handling and stability, but also turn to be a key technology to the study of vehicle intelligent assistant driving systems and intelligent vehicle. Both driver’s behavior and characters of vehicle’s move are to be analyzed in this paper, make the decision of lateral and longitudinal acceleration for its changing scale and bring out its increment network, simple method with transform of reference frame used to preview vehicle future course, integrated decision of vehicle preview course is made by the index of efficiency with index of safety and handling. Simulation on typical road verified the rationality and validity of the model.

关键词： decision evaluate preview

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The Simulation and Control of the Vehicle Dynamics

The Simulation and Control of the Vehicle Dynamics

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2007国际机械工程与力学会议

作者： hsin guan State Key Laboratory of Automobile Dynamic Simulation Jilin University

Vehicle dynamics, which is also named as active safety of the vehicle, mainly consists of the dynamic characteristics of the vehicle such as handling, braking and accelerating ability, and driving *** to configure the vehicle model, how to design and improve the chassis and the other components, how to improve the dynamic performance of the vehicle, how to decrease the manual burden of the driver and how to achieve active safety of the vehicle are always the mainly research aspects of the scientists *** simulation and control of vehicle dynamics is the key technology of configuring the model of the vehicles, controlling the active safety of the car, applying the concurrent design between the vehicle and the components manufacturer and integrating the new-generation chassis control system in the course of *** many years, it has been the significant aspect for the advanced automobile country such as USA, Europe and Japan to strengthen their competition *** this paper, the new progresses in automobile dynamic simulation technology of the world since 90s last century have been reviewed.

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底盘橡胶部件低温特性的试验研究

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汽车工程 2017年第3期39卷 364-368,350页

作者：金耿日管欣詹军郭睿吉林大学汽车仿真与控制国家重点实验室长春130022 金策工业综合大学朝鲜平壤999093

鉴于目前对低温环境下汽车性能与底盘橡胶部件特性关系的探索较少,本文中以某轿车的后纵臂轴套为例,重点对橡胶部件在不同状态下的低温特性进行试验研究。结果表明,低温对橡胶部件动态特性的影响较大,故建议在进行整车性能调校时应充分... 详细信息

鉴于目前对低温环境下汽车性能与底盘橡胶部件特性关系的探索较少,本文中以某轿车的后纵臂轴套为例,重点对橡胶部件在不同状态下的低温特性进行试验研究。结果表明,低温对橡胶部件动态特性的影响较大,故建议在进行整车性能调校时应充分考虑底盘橡胶件的低温特性。

关键词：底盘橡胶部件环境温度低温特性

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基于多传感数据融合滤波的纵向坡度识别算法

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机械工程学报 2018年第14期54卷 116-124页

作者：雍文亮管欣王博卢萍萍吉林大学汽车仿真与控制国家重点试验室

道路纵向坡度是汽车动力传动电控系统和底盘主动安全电控系统控制策略的关键参量。以往对道路坡度估算的研究大多假定坡度为常值,且采用单一传感信息估算纵向坡度。然而实际道路和汽车行驶工况复杂多变,易导致传感信号失真甚至错误,采... 详细信息

道路纵向坡度是汽车动力传动电控系统和底盘主动安全电控系统控制策略的关键参量。以往对道路坡度估算的研究大多假定坡度为常值,且采用单一传感信息估算纵向坡度。然而实际道路和汽车行驶工况复杂多变,易导致传感信号失真甚至错误,采用单一的坡度道路模型和传感信息很难保证坡度估算值的精度。建立定坡度和定坡度变化率两个道路模型,利用车辆纵向动力学和加速度传感两个量测,采用多传感数据融合滤波算法通过加权融合获得精确的坡度估计值。通过驾驶模拟器场地试验,验证了该方法能实时有效地对复杂道路坡度进行估计,辨识精度较高,为汽车先进电控系统控制策略提供基础。

关键词：坡度识别多传感数据融合 Kalman滤波驾驶模拟器

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悬架运动学特性一致性的区间控制方法

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吉林大学学报（工学版） 2011年第4期41卷 910-914页

作者：麻凯管欣逄淑一詹军吉林大学机械科学与工程学院长春130022 吉林大学汽车仿真与控制国家重点实验室长春130022

针对目前还没有文献提出通过控制悬架结构参数容差保证其运动学特性的一致性的方法,提出了旨在利用区间方法建立悬架运动学特性一致性的不确定性结构参数模型。把悬架结构中参数容差看作不确定参数,即区间参数,通过区间控制方法控制其... 详细信息

针对目前还没有文献提出通过控制悬架结构参数容差保证其运动学特性的一致性的方法,提出了旨在利用区间方法建立悬架运动学特性一致性的不确定性结构参数模型。把悬架结构中参数容差看作不确定参数,即区间参数,通过区间控制方法控制其外特性的一致性。最后采用本文方法对双横臂独立前悬架模型的运动学特性进行一致性控制,结果证明了本文方法的可行性。

关键词：车辆工程悬架运动学特性一致性区间控制容差

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汽车动力传动系统分相建模研究

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汽车工程 2017年第3期39卷 311-316页

作者：管欣徐亮郭睿王博宋海岩吉林大学汽车仿真与控制国家重点实验室长春130022

针对不同汽车行驶工况下动力传动系统的自由度会变化的情况,提出了动力传动系统分相建模方法。该方法根据有限状态机中相的概念将汽车动力传动系统的工作状态分为空挡滑摩相、空挡锁止相、在挡滑摩相和在挡锁止相4种相位,并给出了每种... 详细信息

针对不同汽车行驶工况下动力传动系统的自由度会变化的情况,提出了动力传动系统分相建模方法。该方法根据有限状态机中相的概念将汽车动力传动系统的工作状态分为空挡滑摩相、空挡锁止相、在挡滑摩相和在挡锁止相4种相位,并给出了每种相下系统自由度的变化和驱动转矩的计算公式。同时,由于离合器摩擦模型对动力传动系统非线性特性的精确模拟具有重要影响,故建立了满足动力传动系统实时定步长仿真要求的摩擦模型。最后,在典型工况下,进行了模型仿真和实车试验。结果表明,仿真结果与试验结果基本一致,可用于动力传动系统在预开发阶段的性能匹配。

关键词：汽车动力传动系统分相建模

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基于转向几何试验的主销轴线角度和位置的解算

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科学技术与工程 2009年第21期9卷 6593-6595,6600页

作者：管欣逄淑一詹军姬鹏吉林大学汽车动态模拟国家重点试验室长春130022

悬架几何布置未知的情况下,结合悬架K&C试验台的转向几何试验数据,对主销轴线位置和角度进行了分析和推导。根据四轮定位的原理,计算出主销内倾角和主销后倾角的初值;通过分析车轮转动时轮心相对于主销轴线的运动,推导出主销横向偏移距... 详细信息

悬架几何布置未知的情况下,结合悬架K&C试验台的转向几何试验数据,对主销轴线位置和角度进行了分析和推导。根据四轮定位的原理,计算出主销内倾角和主销后倾角的初值;通过分析车轮转动时轮心相对于主销轴线的运动,推导出主销横向偏移距及主销纵向偏移距的算法;通过主销横向、纵向偏移距以及主销内倾角和主销后倾角,计算出内倾拖距和后倾拖距。

关键词：四轮定位主销轴线主销横向偏移距

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An Intelligent Recommendation System for Real Estate Commodity

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Computer Systems Science & Engineering 2022年第9期42卷 881-897页

作者： Tsung-Yin Ou guan-Yu Lin hsin-Pin Fu Shih-Chia Wei Wen-Lung Tsai Department of Marketing and Distribution Management National Kaohsiung University of Science and TechnologyKaohsiung824Taiwan College of Management National Kaohsiung University of Science and TechnologyKaohsiung824Taiwan Department of Information Management Asia Eastern University of Science and TechnologyNew Taipei220Taiwan

Most real estate agents develop new objects by visiting unfamiliar clients, distributing leaflets, or browsing other real estate trading website platforms,whereas consumers often rely on websites to search and compare prices when purchasing real property. In addition to being time consuming, this search processrenders it difficult for agents and consumers to understand the status changes ofobjects. In this study, Python is used to write web crawler and image recognitionprograms to capture object information from the web pages of real estate agents;perform data screening, arranging, and cleaning;compare the text of real estateobject information;as well as integrate and use the convolutional neural networkof a deep learning algorithm to implement image recognition. In this study, dataare acquired from two business-to-consumer real estate agency networks, i.e., theSinyi real estate agent and the Yungching real estate agent, and one consumer-toconsumer real estate agency platform, i.e., the, FiveNineOne real estate agent. Theresults indicate that text mining can reveal the similarities and differences betweenthe objects, list the number of days that the object has been available for sale onthe website, and provide the price fluctuations and fluctuation times during thesales period. In addition, 213,325 object amplification images are used as a database for training using deep learning algorithms, and the maximum image recognition accuracy achieved is 95%. The dynamic recommendation system for realestate objects constructed by combining text mining and image recognition systems enables developers in the real estate industry to understand the differencesbetween their commodities and other businesses in approximately 2 min, as wellas rapidly determine developable objects via comparison results provided by thesystem. Meanwhile, consumers require less time in searching and comparingprices after they have understood the commodity dynamic information, therebyallowing the

关键词： Real estate agency web crawler image comparison text mining deep learning real estate object dynamic recommendation system

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