摘要
为解决挖掘机室内模拟加载实验中信号加载的问题,将通用循环工况的理论应用到挖掘机负载工况的研究中。首先,运用近似均值精度估计法计算了实验所需的样本长度,建立了样本统计误差与样本长度之间的关系,从而得到了某统计精度下的样本长度;结合挖掘机的实际工作过程,运用经验模态分解法获取了子样本序列,并提出了利用包络线寻找波峰位置的方法分割样本周期,对分割得到的样本信号作了统计分析,得到了各工作模式的通用工况;将所有工作模式的统计结果拼接,得到了挖掘机某工作条件下的负载工况;最后,对统计结果与样本信号进行了相似度验证。研究结果表明,采用该方法得到的负载工况与样本工况具有较高的线性相关性,可以用于挖掘机室内模拟加载实验。
Aiming at the problems of loading signal occured on indoor simulation experiments of loading excavator, the theory of universal cycle condition was applied in the study of excavator load condition. Firstly, the approximate mean accuracy estimation method was used to obtain the required sample size. Then, the relation between the sample mean error and sample size was established, to complete the sample collection under some statistics. Combined with the excavator actual working mode, the different operating modes contained with the excavator working cycle as the research object, the effective number of times was used to seek the envelope method to split the work cycle, statistic the splitted sample signal to get a universal operating modes. Finally, synthesize excavator working conditions was gotten under load conditions by the statistical results of all operating modes, and similarity argument about statistical results with the sample signal was done. The results indicate that the load conditions obtained by this method and the sample have a highly linear correlation, which can be used for indoor load simulation experiments.
出处
《机电工程》
CAS
2013年第1期43-46,共4页
Journal of Mechanical & Electrical Engineering
基金
浙江省自然科学基金资助项目(Y107409)
特种装备制造与先进加工技术教育部/浙江省重点实验室开放基金资助项目(2009EP024)
关键词
液压挖掘机
负载工况
样本长度
包络线
相似度
hydraulic excavator
load condition
length of the sample
envelope line
similarity
