Optimization And Simulation Of Stepless Amplitude Modulation System For Vibratory Roller

Vibratory roller is widely used in highway engineering as compaction machinery for road construction materials.The vibratory roller utilizes the combined action of the self-weight and vibration force of the vibration wheel to compact the compacted material to achieve compaction.Different compaction forces are required for different compacting materials,different compaction thickness and different compaction conditions,and different compacting forces can be achieved by adjusting the excitation force.The magnitude of the excitation force can be adjusted in two ways—frequency or amplitude.At present,most vibratory rollers regulate excitation force by adjusting amplitude,and most of them are level modulated.The level amplitude modulation range is small and it can't adapt to the compacting material better.Therefore,it has become an important trend to study the intelligent roller with automatic density measurement and stepless amplitude modulation or frequency modulation.In this paper,the electro-hydraulic stepless amplitude modulation exciter of vibratory roller is selected as the research object,and the stepless amplitude modulation mechanism is optimized and simulated.The amplitude modulation mechanism realizes the adjustment of the exciting force through the position of the block controlled by the electro-hydraulic commutation under the PID regulation.The completed research work is as follows:1.The mathematical model of the amplitude modulation mechanism is established,and the linear relationship between the eccentricity of the eccentric eccentricity and the excited force of the roller is obtained.2.According to the structural characteristics of the vibrator,the hydraulic control system is designed,the parameters are calculated and the component selection is selected.The AMESim software is used to simulate the hydraulic system and control mode.The simulation results verify the rationality of the system design.3.The control system is developed according to the hydraulic system.Compared with different control modes,the control mode of servo valve is determined and PID algorithm is used for better control speed and accuracy.Through the analysis of the simulation model of the control system,the system can realize the adjustment of 20% movement stroke in one second after PID parameter setting,the signal overshoot is small and the fluctuation is small.4.Combined with the stepless amplitude modulation mechanism,the sensor technology and the GPS system,the realization method of the intelligent compaction is put forward.According to the information of the GPS position,the scheduling method of the roller is put forward,and the compacting effect of the whole construction plane is guaranteed by controlling the amplitude and speed of the roller.Through in-depth study,it is shown that the structure of the exciter is reasonable,and its regulation and control performance is excellent.It can be used as the basis for the development of intelligent roller.