Vibrating Screen Dynamics Analysis And Optomized Design Based On Virtual Prototyping Technology

Inertial vibrating screen as a material classification, because of its simple structure, reliable operation and other advantages, are widely used in construction, coal preparation, mineral processing, metallurgy, petrochemical, food and other industries. Inertial vibrating screen through the body of the vibration imposed on the screen, so that material is loose, layered, transparent screen, simultaneous transmission of materials, so as to achieve the purpose of screening material classification. Vibrating screening machine as an important part of a complete set of production equipment , their screening results and work stability has an extremely important impact to the operational efficiency of the follow-up.Virtual prototyping technology is a new technology defined as product design and development process, the scattered components and advanced analytical techniques are rub together to build a computer model of the product, and put the product in a variety of jobs into the state simulation analysis, forecast the overall performance of the product, thereby improving product design, improve product performance.In this paper, the inertial vibrating screen of laboratory as the research object , based on its co-simulation and virtual prototype technology, using the finite element analysis software ANSYS and the multi-body dynamics software platforms and analysis techniques ADAMS, to establish the rigid-flexible coupled model, and using the multi-body dynamics theory to analysis the motion characteristics of inertial vibrating screen, using the transient dynamics method to analysis the force of the main parts of inertial vibrating screen, and based on this to optimize the vibrating screen exciter beam. Strengthens the overall performance of the vibrating screen, and enables it to achieve the best design effect.In this thesis, carried out the following areas:(1) Theoretical AnalysisBased on the main structural of the vibrating screen and its working principles, establish it's dynamic model. Use vibrating screen vibrations differential equation deduce the formula of velocity, acceleration, amplitude and phase difference at work; gives the main kinetic parameters of calculation method of the isolation system spring stiffness, transmission rate, the center of mass and driven motor power, as this paper analysis process basis. Provided a theoretical basis for the analysis of thesis.(2)Three-dimensional ModelingUse Pro/e modeling software to build solid models of inertia vibrating screen parts, according to the composition and vibrating screen assembly relations between parts establish the vibrating screen assembly model.(3)Multi-body Dynamics AnalysisVibrating screen dimensional model will be imported ADAMS by using Mechanism/Pro module. In ADAMS / View to impose constraints, movement and loads on models, establish the inertial vibrating screen's rigid body dynamics model, and simulation analysis. Get vibrating screen box center of mass displacement curve and vibration isolation spring support reaction curves, solve the vibration isolation system transfer rate, verify the correctness of the rigid body vibrating screen model.(4)Coupled Dynamics AnalysisIn the ANSYS platform to establish excitation beam finite element model for mesh and modal analysis,generate modal neutral file.Using ADAMS / Flex module import modal neutral file into ADAMS to the establish the rigid-flexible coupling dynamic model of vibrating screen,carries on the simulation analysis to it, obtains vibrating screen box center of mass displacement curve,finally output load spectrum file used in ANSYS transient dynamics analysis and optimization design.(5)Transient Dynamic Analysis and Design OptimizationEstablish excitation beam finite element model, import load spectrum file, using ANSYS for its transient dynamics analysis.Obtains excitation beam's biggest stress over time curve in the start-up and stable operation state as well as excitation beam's nephogram of stress in resonance. Take the excitation beam thickness as the design variable, the rigidity and the intensity is the state variable, the volume is smallest for the objective function carries on the optimized design to the excitation beam, around the optimization the excitation beam's volume reduced 29.4%. After optimization,the excitation beam could also satisfy the work requirement according to the confirmation, so the optimization achieved the anticipated optimized goal.