Research of standard load condition of hydraulic excavator

YU Hong-guang1， GAO Feng1， LIU Gui-guo2， YANG Qing-hua1
（1.Key Laboratory of E & M， Ministry of Education & Zhejiang Province， Zhejiang University of Technology，Hangzhou 310014， China；
2. Zhejiang Business Technology Institute， Ningbo 315012， China）

Abstract： 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.
Key words： hydraulic excavator； load condition； length of the sample； envelope line； similarity