Strain modal analysis of large-scale fracturing pump truck frame
LIU Jian1，LIU Zhong-yan1，PANG Han1，WU Lei1，WU Han-chuan2，
XIAO Liu-sheng1，XIAO Wen-sheng1
（1. College of Machinery and Electronic Engineering，China University of Petroleum，Qingdao 266555，China；2. SJ Petroleum Machinery Co.，Jingzhou 434024，China）
Abstract： In order to solve the problem of abnormal vibration in large- scale fracturing pump truck ，the stochastic subspaceidentification（SSI）modal of vibration strain response was investigated. After the analysis of experimental strain modal ，the relationshipbetween vibration strain response and frame's vibration characteristics was established. A method was presented to remove seriousvibration of pump truck. Using triplex pump as the excitation source，the vibration of the frame was tested ，the frame's first six ordernatural frequencies were identified by the strain modal analysis SSI. The results indicate that the strain modal analysis SSI can identifythe frame's natural frequencies in original support boundary conditions. The frame's low order natural frequency of is between 1.79 Hz~32.1 Hz，which has overlap area with the triplex pump vibration frequency and cause the truck's abnormal vibration.
Key words：constrain vibration；strain modal；stochastic subspace identification；fracturing pump truck frame