Study On The Principle Of Work For Reversible Vibratory Plate Compactor And Computer Simulation

Reversible vibratory plate compactor is a kind of vibratory compactor withthe features of simple and convenient maneuverability. It is widely applied to theconstruction subjects that are not applicable to use large-scale compactor, forinstance, narrow sectors, curb, trench, culvert, and so on. The application ofreversible vibratory plate compactor will improve the work efficiency, and avoidthe waste of manpower and material resources. At the present time, although manyresearch organizations in our country have developed study on the small-sizecompactor, there are still some gaps compared with abroad institute on study level.Therefore, it is very necessary to study the work principle of reversible vibratoryplate compactor, which will improve the design level of small-size compactor, andlay the foundation of sound design and operation for this kind of press machine.On the basis of RP522 vibratory plate compactor maded by STONE Companyin America, this paper analyzes the structural characteristic of this compactor andthe principle of its vibration isolation mounting after fully studying on theconstitution of this compactor and the operation conditions, and the research hasdefinite reference value on the aspect of the schematic design. Considerating thecharacteristic of the product, this paper analyzes the work principle of the vibrationexciter and the altering direction and amplitude modulation mechanism in thisdevice. Adopting the methods of theory analysis and virtual prototype technology,this paper researched the principle of compactor's travel, speed adjustment,altering direction and amplitude modulation. The results indicate that alteringdirection, modulating amplitude and adjusting speed are realized by adjusting thephase angle of the eccentric block with displacing piston of hydraulic cylinder.Taking advantage of the virtual prototype soft ADAMS, we finished thethree-dimensional sculpt of the vibration exciter, the altering direction, amplitudemodulation mechanism, and hydraulic system of this plate compactor;and then webuild the kinematics and dynamics simulations of this system in order to determinethe position, speed and acceleration of and all components of the system at anytime, meanwhile, we determine the applied force and counterforce which thesystem and all components required by solving the algebra system of equations.Studying on the mechanism's kinematics and hydraulic system's dynamics, theresults are obtained that one is that the operating force is small, and the other is therule of dynamic decipline of the whole mechanism. The results provide thetheoritical foundation of design and application of this mechanism. Moreover weget the pressure of hydraulic cylinder in simulation. That may provide thereference data for the improvement of hydraulic system and control system.We try to start this paper with the conjunct point of mechanic engineering andsoil mechanics, and consider the plate compactor and soil as a whole system. Thenwe study the dynamic performance of interaction between the compactionequipment and soil. After analyzing the system dynamics, we establish afour-degree freedom vibration dynamic model for the whole system. Thehorizontal motion and vertical motion of this model are done detailedly analyzedand explained in theory. Because the plastic-elastic deformation is maindeformation at the beginning of press work and the horizontal displacement onlyarise in jump stage, we add an unloading stage in earth connection stage toimprove this model. On the basis of RP522 vibratory plate compactor, a programfor solving the numerical parameters of the model has been developed by means ofMATLAB/Simulink software according to the principle of the computer numericalsimulation method. So the relative stabilization compacting process can besimulated and analyzed, and the dynamic response for various work parameters canbe got. This paper discusses mutative relation between the change of vibrationwork parameters and the dynamic characteristic of the plate compactor materialintensity in the same condition of the soil. It may have some reference value insome way by using the result of this thesis, such as on the aspect of the wholemachine design and capability research, etc.The trial model machine of the vibratory plate compactor has been tested withvarious vibration frequencies in same work conditions. The travel speed and thevibratory capability of the model have been tested. The acceleration signals havebeen processed and analyzed by the computer. The results which the vibratoryfrequency affected the vibratory characteristic and self-moving capability has beenobtained, and the numerical model is verified by comparing the test data with theresult of numerical simulation. So these works may provide basement forparameters optimization and improvement of the kind of compactor. Through thetest, the characteristic of the plate compactor is wholly examined, and thephenomena are found that the operation force of altering direction is small, so itcould keep linear travel even if unloading this force. The result of experiment is thebasement for parameters optimization and improvement of the machine.