共查询到20条相似文献,搜索用时 109 毫秒
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针对快速液压机存在压力加载延迟的问题,提出了在液压系统中采用高位充液油箱和更换液控单向阀为大通径充液阀的改进方案。利用AMESim对改进前、后的系统进行建模并仿真,通过分析改进前、后液压缸的行程、压力变化曲线和充液闯、液控单向周的流量曲线,证实了改进方案能较好地改善液压机压力加载性能,提高工作效率。 相似文献
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驾驶室悬置隔振改进设计中DOE技术的研究应用 总被引:7,自引:0,他引:7
将正交设计原理与ADAMS中的试验设计(DOE)技术相结合,对某典型商用车全浮式驾驶室悬置隔振系统与主悬架系统的参数匹配问题进行研究。并提出对原车的改进方案,分析结果表明改进方案取得了良好的效果。 相似文献
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为了克服被动轮驱动蛇形机器人运动能力弱的缺点,提出了一种新型三连杆主动轮驱动蛇形机器人.该蛇形机器人由多个被动关节连接的串联连杆组成,每个连杆的中心都有一个主动全向轮.全向轮的驱动力只作用于横向,而机器人则沿纵向运动.此外,针对该蛇形机器人具有非完整约束和欠驱动的特点,采用局部坐标系,设计了一种带有防滑功能的运动控制器... 相似文献
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为了解决海量数据导致电网控制效率低的问题,提出改进k-means的电网控制自动化系统数据聚类方法。首先,利用主成分分析法提取出电网控制自动化系统数据主成分,将数据简化和降维;然后,通过滤波去噪处理电网数据,保证聚类样本干净整洁;最后,在改进k-means聚类算法下对数据聚类,确定k值得到最优聚类结果,实现电网控制自动化系统数据聚类。实验结果,对比每组样本下3种方法的Silhouette值,每组实验中Silhouette值的最大值都是所提方法,说明所提方法的聚类难度小和频率控制稳定性小。 相似文献
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Reliability assessment of the braking system in a high?speed train under small sample size and zero?failure data is veryimportant for safe operation. Traditional reliability assessment methods are only performed well under conditions of large sample size and complete failure data,which lead to large deviation under conditions of small sample size and zero?failure data. To improve this problem,a new Bayesian method is proposed. Based on the characteristics of the solenoid valve in the braking system of a high?speed train,the modified Weibull distribution is selected to describe the failure rate over the entire lifetime. Based on the assumption of a binomial distribution for the failure probability at censored time,a concave method is employed to obtain the relationships between accumulation failure prob?abilities. A numerical simulation is performed to compare the results of the proposed method with those obtained from maximum likelihood estimation,and to illustrate that the proposed Bayesian model exhibits a better accuracy for the expectation value when the sample size is less than 12. Finally,the robustness of the model is demonstrated by obtaining the reliability indicators for a numerical case involving the solenoid valve of the braking system,which shows that the change in the reliability and failure rate among the di erent hyperparameters is small. The method is provided to avoid misleading of subjective information and improve accuracy of reliability assessment under condi?tions of small sample size and zero?failure data. 相似文献
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为了解决传统加密系统在信息共享过程中数据流失量较多,严重影响信息安全性的问题,设计了数据中心网络节点信息共享加密系统.通过系统硬件结构、服务器选型等硬件设计,以及基于加密算法生成节点信息共享密钥、数据中心中网络节点信息的共享加密处理等软件设计,提出一种全新的加密系统.通过实验表明,所提出的加密系统可降低数据丢失量,为信息的安全共享提供保障. 相似文献
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机械装配与机械设计一样 ,存在着人机工程关系。在这一人机系统设计中 ,主要解决人机系统中的安全、高效、经济问题。因而 ,在机械装配中要根据人机学原理 ,合理设计各种参数 ,既保证安全 ,又提高生产效率。 相似文献
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供水长输管线排气阀的选择 总被引:2,自引:0,他引:2
随着长距离调水工程的实施 ,管路排气不畅造成的爆管现象频繁发生 ,造成经济损失大 ,且严重影响了供水系统的安全和稳定运行。解决管路存气问题的有效办法之一是选择和安装性能良好的排气阀。本文分析了管路排气不畅对供水系统造成的危害和目前我国市场上常见排气阀的结构形式及其技术性能特点 ,及选择安装的技术建议 ,旨在帮助用户正确选择排气阀 相似文献
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The accurate control for the vehicle height and leveling adjustment system of an electronic air suspension(EAS) still is a challenging problem that has not been effectively solved in prior researches. This paper proposes a new adaptive controller to control the vehicle height and to adjust the roll and pitch angles of the vehicle body(leveling control) during the vehicle height adjustment procedures by an EAS system. A nonlinear mechanism model of the full?car vehicle height adjustment system is established to reflect the system dynamic behaviors and to derive the system optimal control law. To deal with the nonlinear characters in the vehicle height and leveling adjustment processes, the nonlinear system model is globally linearized through the state feedback method. On this basis, a fuzzy sliding mode controller(FSMC) is designed to improve the control accuracy of the vehicle height adjustment and to reduce the peak values of the roll and pitch angles of the vehicle body. To verify the effectiveness of the proposed control method more accurately, the full?car EAS system model programmed using AMESim is also given. Then, the co?simulation study of the FSMC performance can be conducted. Finally, actual vehicle tests are performed with a city bus, and the test results illustrate that the vehicle height adjustment performance is effectively guaranteed by the FSMC, and the peak values of the roll and pitch angles of the vehicle body during the vehicle height adjustment procedures are also reduced significantly. This research proposes an effective control methodology for the vehicle height and leveling adjustment system of an EAS, which provides a favorable control performance for the system. 相似文献