Vibration Analysis And Vibration Isolation Design Of Hydraulic Fracturing Truck Engine

Fracturing truck is the main equipment in fracturing industry.In order to meet the engineering needs,its power and quality are increasing gradually,but the resulting abnormal vibration of the vehicle is also increasingly prominent.On-board engine is the key component of hydraulic fracturing truck and one of the main vibration excitation sources.In fracturing operations,excessive mechanical vibration often causes pipeline cracking,oil and gas leakage,parts failure and other problems,which would seriously reduce the working performance.Therefore,this paper takes the engine of a certain type of hydraulic fracturing truck as the research object,studies the phenomenon of abnormal vibration in the process of operation,analyzes the vibration response rule and influencing factors of the engine,proposes improvement measures to reduce the impact of engine vibration on the whole vehicle,and provides theoretical and technical support for the design of engine vibration isolation system.The main research contents of this paper are as follows:Firstly,based on the structural composition and partial parameters of the engine,the excitation characteristics of the engine vibration are analyzed,the motion law of the crank slider mechanism is analyzed,the kinematics and dynamics of the mechanism are analyzed,and the magnitude and main order of the unbalanced inertia force and moment are obtained.Secondly,in view of the abnormal vibration phenomenon in the engine working process,a test was designed to test the vibration response under the working condition.The test data were analyzed in time domain and frequency domain to study the engine vibration mechanism and influencing factors,and the analysis results were used as the verification conditions for the subsequent engine dynamics analysis.Thirdly,ABAQUS finite element analysis software and ADAMS dynamic simulation software were used to establish a rigid-flexible coupled multi-excitation engine vibration model.The time-domain and frequency-domain characteristics of the model were simulated and analyzed,and the correctness of the model was verified by comparing with the test results.On the basis of engine dynamics model,the influence of engine position and support mode is studied.Finally,based on ADAMS Insight dynamic optimization design module,the vibration acceleration amplitude of the frame side of the engine vibration isolation system is taken as the objective function and the modal frequency of the vibration isolation system is taken as the constraint condition.The optimization design of the vibration isolation system is carried out to reduce the vibration response of the engine and improve the vibration isolation performance of the system.