乘用车制动感觉评价性研究

发布时间：2018-01-19 04:20

本文关键词： 城市工况踏板感觉制动噪声真空助力器工作点制动负荷指数　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着消费者经济实力的不断上升,人们对车辆操纵性能的要求也不断提高,而作为操纵性能中十分重要的制动感觉也越来越受到大家的重视。针对大家关注的制动感觉性能,论文通过人,车,环境三个方面针对性的提出了制动感觉的试验规范,评价方法和评价标准。通过专业评价人员的评价经验与客观实验数据对比,量化到具体的车辆客观实验参数,形成具体的制动感觉评价方法,帮助生产厂商在设计之初就能够充分考虑车辆的制动感觉,为满足消费者使用需求提供理论指导。论文在总结国内外制动感觉评价及相关研究的基础上,采用了客观参数对应主观评价的制动感觉评价方法。通过实车实验及台架试验获取包括制动踏板力,制动踏板行程,制动减速度,制动盘温度,制动过程速度差,制动噪声等在内大量实时实验数据,通过高阶傅里叶数据统计方法,把实验过程中出现的一些杂乱且不符合实际的随机数据剔除并且将剩余数据用数学的统计方法进行仿真拟合,从而反映数据的变化规律。考虑到制动盘与摩擦片之间的接触关系受到材料属性,环境温度,环境湿度等因素的影响,使得研究两者之间的接触关系变得十分复杂。通过力学分析的方法,建立盘式制动器的力学简化模型,通过采用线性弹簧来模拟两者接触表面受力的方法来对制动噪声的产生进行研究。最后,结合所获取的拟合曲线以及对应数据库,结合专业制动感觉评价人员的主观评价,对试验结果进行研究分析,分别设立评价标准,探讨制动噪声发生规律。特别的,通过将城市制动工况分为城市拥堵工况,城市一般工况,城市郊区工况,城市环线高速工况这四种工况进行分类统计分析,同时提出了使用制动负荷指数来反映制动系统及城市交通工况的工作强度。在研究制动感觉的过程中,主要使用制动踏板力,制动踏板行程,制动减速度等来对工况进行描述和分析,并以此为车辆制动系统工作参数评价指标,进而提出城市制动工况下,车辆参数所需要达到的制动感觉水平,为车辆的达标测试提供相关标准。同时,针对城市工况下制动噪声的产生时段,对应制动盘温度,噪声自身的频率和分贝大小进行统计分析,通过台架试验结合相关工况,最后建立了标准试验工况及相关实验规范和制动噪声评价标准,达到实现乘用车制动感觉评价的目的。
[Abstract]:With the increasing economic strength of consumers, people's requirements for vehicle handling performance are also increasing. As a very important braking performance, braking sensation is paid more and more attention. Three aspects of the environment targeted to put forward the braking feeling test norms, evaluation methods and evaluation criteria. Through the professional evaluation experience and objective experimental data comparison. Quantification to the specific vehicle objective experimental parameters to form a specific braking feeling evaluation method to help manufacturers in the early design can fully consider the braking feeling of the vehicle. In order to meet the needs of consumers to provide theoretical guidance. This paper summarizes the domestic and foreign braking feeling evaluation and related research on the basis. Using objective parameters corresponding to subjective evaluation of braking sensation evaluation method. Through real vehicle experiments and bench tests, including brake pedal force, brake pedal stroke, braking deceleration, brake disc temperature. A lot of real time experimental data, such as braking speed difference, braking noise and so on, are obtained by high order Fourier data statistic method. Some random data which appear in the experiment process are eliminated and the remaining data are simulated by mathematical statistical method. Considering that the contact relationship between brake disc and friction disc is affected by material property, environment temperature, environmental humidity and so on. The study of the contact relationship between the two becomes very complicated. Through the method of mechanical analysis, the simplified mechanical model of disc brake is established. By using the linear spring to simulate the force on the two contact surfaces to study the generation of braking noise. Finally, combining with the obtained fitting curve and the corresponding database. Combined with the subjective evaluation of professional brake sensation evaluators, the test results were studied and analyzed, and the evaluation criteria were set up, respectively, to discuss the regularity of brake noise. By dividing the braking conditions into four conditions: urban congestion conditions, urban general conditions, suburban conditions, high-speed conditions of the urban loop to classify and analyze the four conditions. At the same time, the braking load index is used to reflect the working intensity of braking system and urban traffic conditions. In the process of studying the braking feeling, the brake pedal force and brake pedal stroke are mainly used. Braking deceleration and so on to describe and analyze the working conditions, and as a vehicle braking system working parameters evaluation index, and then put forward the city braking conditions, vehicle parameters need to reach the level of braking sensation. At the same time, according to the brake noise generation period, corresponding brake disc temperature, noise frequency and decibel size statistical analysis. Through the bench test combined with the related working conditions, the standard test conditions, the relevant experimental specifications and the brake noise evaluation standards are established at last, so as to achieve the purpose of passenger vehicle braking sensation evaluation.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U463.5

【相似文献】