共查询到19条相似文献,搜索用时 156 毫秒
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通过对盘式制动器结构和工作原理进行分析,开发了基于LabVIEW的制动器低压气密性测试系统。该系统硬件搭建简单、成本低,可振性高,测试功能主要由软件完成,测试精度和实时性比传统仪器有显著提高,并可完成数据的采集、显示、记录及报表输出等功能。该系统现已成功应用于企业装配生产线,为制动器零件新产品开发提供了准确数据,并为实现智能装配检测提供了技术平台。 相似文献
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为解决汽车盘式制动器在使用周期内的磨损导致可靠度降低,和产生制动噪声问题,提出一种汽车盘式制动器系统时变稳定性分析与优化方法。该方法引入随机过程参数来描述使用过程中存在磨损的制动器结构,构造含有随机参数和随机过程参数的制动器系统不确定参数化模型,以进行制动器使用过程中的稳定可靠性动态预测。在此基础上,针对制动器使用后期可靠性下降问题,运用时变可靠性分析理论、响应面技术和遗传算法,以复特征值阻尼比负值最小化为优化目标,对制动器系统时变稳定性进行优化,以保证使用周期内的可靠度满足要求。最后以某车浮钳制动器为例,采用本文方法有效预测了其时变稳定可靠性,并通过优化制动器支撑背板密度和厚度,有效提高了制动器使用后期的稳定可靠度。 相似文献
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对比分析了Oracle数据库字符集中使用较多的中字符集和Unicode字符集,阐述了数据库实际应用中可能遇到的转换Oracle数据库字符集的方法和操作步骤,指出了目前互联网上一个广为流传的修改Oracle数据库字符集的错误方法及其可能导致的严重后果,给出了实用的字符集转换操作建议。 相似文献
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随着国家商用车新版营用规范及环保政策的出台,要求商用车各系统进行优化升级。鼓式制动器作为商用车用车桥重要的一子系统,其性能、重量、成本对整桥及整车使用影响较大。文章通过对现有商用车桥制动器应用现状的分析,对重型商用车桥鼓式制动器结构进行轻量化和集成化设计,设计开发出一款单销结构制动器,其制动性能、刚性、重量等多项指标优于传统制动器,满足使用要求。 相似文献
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本文在建立汽车制动性模型的基础上,利用VisualC++6.0平台对汽车制动性进行模拟计算,从而得出汽车制动性的各项评价指标。该仿真系统界面友好,交互性良好,具有较高的准确性和实用性。 相似文献
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文章基于Visual C++6.0开发平台,设计开发了一套含有比例阀的制动系统性能分析系统,搭建了传统制动系统开发的自动化平台,设计了友好的用户界面,弥补了传统手工或编程计算的不足,拓宽了制动器开发系统的使用范围。 相似文献
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S. P. Jung K. J. Jun T. W. Park J. H. Yoon 《International Journal of Automotive Technology》2008,9(1):45-51
It is quite challenging to estimate the braking performance of a vehicle because the brake system is comprised of many parts,
including a booster, master cylinder, and caliper. Calculation of characteristics such as braking force through vehicle tests
requires much time and money. Therefore, the development of a method to estimate the braking performance of a vehicle using
qualitative methods is beneficial. In this study, a program that can analyze the braking capabilities of a vehicle such as
pressure, efficiency, and pedal travel is presented. The increase in disc temperature during braking as well as the properties
of various boosters can be calculated using the proposed program. Dynamic characteristics of a vehicle equipped with a Load
Sensing Proportional Valve (LSPV) were computed more precisely by obtaining the change in valve pressure according to the
displacement of a suspension system. Since all input and output files are composed in the Microsoft Excel format, both design
data management and database construction can easily completed. 相似文献
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Analysis of disc brake instability due to friction-induced vibration using a distributed parameter model 总被引:1,自引:0,他引:1
Y. -G. Joe B. -G. Cha H. -J. Sim H. -J. Lee J. -E. Oh 《International Journal of Automotive Technology》2008,9(2):161-171
This paper deals with friction-induced vibration of a disc brake system with a constant friction coefficient. A linear, lumped,
and distributed parameter model to represent the floating caliper disc brake system is proposed. The complex eigenvalues are
used to investigate the dynamic stability, and, in order to verify simulations which are based on the theoretical model, an
experimental modal test and dynamometer test are performed. The comparison of experimental and theoretical results shows good
agreement, and the analysis indicates that modal coupling due to friction forces is responsible for disc brake squeal. Also,
squeal type instability is investigated, using a parametric analysis. This indicates which parameters have influence on the
propensity of brake squealing. This is helpful for validating the analysis model and establishing confidence in the experimental
results of the modified system. These results may also be useful during system development or diagnostic analysis. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(8):1267-1282
Brake systems in trucks are crucial for ensuring the safety of vehicles and passengers on the roadways. Most trucks in the USA are equipped with S-cam drum brake systems and they are sensitive to maintenance. Brake deficiencies such as leaks and out-of-adjustment of the pushrod are a major cause of accidents involving trucks. Leaks in the air brake systems drastically affect braking performance by decreasing the maximum attainable braking pressure and also increasing the time required to attain the same, thereby resulting in longer stopping distances. Out-of-adjustment of the pushrod leads to loss of braking torque even if no leaks are present in the air brake system. In this paper, we present a mathematical model for an air brake system in the presence of leaks, with a view towards developing a diagnostic system for the air brake system based on the models. Additionally, we present a scheme that estimates the severity of leak in terms of the mass flow rate of air leaking from the air brake system to the atmosphere. This scheme can be implemented using a simple look-up table. We also present a steady-state pushrod stroke estimation scheme, based on brake chamber pressure measurements in the absence of any leaks in the air brake system. 相似文献