Research On Key Technology Of Dynamic Simulation And Vibration Control Of Internal Combustion Forklift

Internal combustion forklift is a kind of industrial vehicle with loading and transporting function,which is commonly used in production workshop,transportation port and other places.This kind of forklift produces a strong vibration in the process of operation.Such vibration will not only damage the structure of the vehicle body and shorten the service life of the forklift,but also make people feel tired,and damage the driver’s physical and mental health.Therefore,controlling the internal combustion forklift vibration and improving its ride comfort is one of the concerns for the forklift enterprises.This project is commissioned by a forklift enterprise to study the vibration of a certain type internal combustion forklift.The main contents are summarized as follows:1.Vibration of the internal combustion forklift is analyzed after testing.According to the customers’ feedback,the steering wheel vibrates strongly during the work process.In this paper,the vibration test of steering wheel,instrument frame,transmission system and powertrain mount are carried out.Then,the modal test of steering wheel and instrument frame are carried out.Finally,through the analysis of the suspension transmission rate and the steering wheel test data,find out the main reason of the vibration.It lays the foundation for the design of follow-up optimization program.2.A rigid-flexible coupling dynamics model of internal combustion forklift is established.According to the demand of the model,the overall structure of internal combustion forklift is divided into key components such as power train,frame,roof,front axle,rear axle and tire.The model of the forklift rigid body is established by the test and the data provided by the manufacturer.And depending on the results of vibration test,the frame and connecting bolts are treated as flexible body model,and imported into ADAMS software to assemble with forklift rigid body model.Finally,the Rigid-flexible coupling dynamics model of internal combustion forklift is established.3.Dynamics simulation of internal combustion forklift and optimization of power assembly suspension are carried out.Based on the rigid-flexible coupling dynamics model of internal combustion forklift,the stiffness and damping of the power train mounting are optimized.And the optimization results are verified by the test.The results show that the transmission speed of the internal combustion forklift is reduced.Under the idle condition,the acceleration of the steering wheel is reduced by more than 45% on the original basis.At other speeds,the acceleration of the steering wheel is reduced by more than 20% on the original basis.The problem of internal combustion forklift steering wheel vibration is solved well.4.A parameterized optimization platform for internal combustion forklift is developed.The ADAMS command language is used for secondary development,and the parameterized simulation and optimization platform of internal combustion forklift is built.The platform not only improves the modeling,simulation and optimization efficiency of internal combustion forklift,but also provides the foundation for the subsequent construction of the internal combustion forklift vibration con trol.As mentioned above,the method used in this study and the conclusions obtained have practical value,which can guide the vibration control of other types of internal combustion forklift.