Analysis Of The Dynamical Characteristics Of The Single-wheel-rollover Vibrating Unloading Platform

Through investigating and analyzing existing unloading platform,we found that the current design of unloading platform is mainly full-vehicle-sized platforms and rear dumping discharging way.Due to full-vehicle-sized platforms’ big volume and heavy weight,consumables,lifting Angle is large and large energy consumption,the traditional design limits the promotion and development of unloading platforms.This paper presents the design of a single-wheel-rollover hydraulic unloading platform.The design can save material and reduce cost by reducing platform’s volume,weight and lifting angle.In this project,we first design and check the static strength and rigidity of the structure through the traditional method,and select the proper lifting hydraulic cylinder model;we can draw a preliminary conclusion that the device can meet the design requirements and strength requirements.Those conclude that single wheel rollover vibrating unloading platform device can be achieved in terms of the design,and we establish the three-dimensional model of the device in the Pro/E software.Second,we solve the non prestress modal and analyze the forced vibration response of the platform under constant load and changing load respectively.We solve the first six-order modes of frequency and vibration and the motion status when the vibration just intervenes and the load is continuously unloading of the platform respectively.Third,we analyze the static properties of the unloading platform,lifting equipment and spring of the single wheel roll-over vibrating unloading platform device through finite element method,to solve their total deformation and equivalent stress Von-Mises stress,which further verify the device can meet the requirements in terms of static strength.Forth,the non prestressed modal of the platform as well as the prestressed modal and harmonic response of the platform,lifting equipment and spring of the single wheel roll-over vibrating unloading platform device under different working conditions through finite element method,obtaining the prestressed modal frequencies and mode shapes more close to the reality and their respective resonance frequency.The finite element solution and the analytical solution of the non prestressed modal of the platform are compared.The error is within 20%,and the requirement is satisfied.Fifth,the transient dynamic of the forced vibration response of the platform is analyzed through finite element method when bearing constant load and changing load respectively,and the finite element and analytical solution of the normal displacement(deformation)and velocity curves at No.1 wheel and No.3 wheel position are compared,which are basically identical.To sum up,the unloading platform device designed meet the static strength condition,and can be used in the production practice;and through analyzing the dynamic characteristics of the device,we can see that the designed device can realize vibrating shake function;and under the premise that the designed unloading platform device can complete the required unloading work,compared to the conventional unloading platform,the size and weight can be reduced by half,and the lifting height is about just 10%of the traditional one,which greatly save the energy,and have wide application prospect.In this paper,the structure of unloading platform device operating method and forced vibration analysis method(the forced vibration of the platform when bearing changing load)etc.have been innovated.