Abstract:Motion platform is widely used in hydraulic equipments like grinding machine, planning machine, vibration table and etc. Asymmetric hydraulic cylinder was usually used in these equipments, when the system changed direction of movement, there was reversing pressure impact and cylinder pressure jump. At present, aiming at these problems the main solutions were the methods of using buffer oil cylinder, changing the direction after release the pressure first, using the accumulator to absorb pressure impact, and changing asymmetric hydraulic cylinder to symmetric hydraulic cylinder. Aimed at the problem of system shake in motion platform caused by using of asymmetric hydraulic cylinder, the schemes of using differential cylinder and two-valve-controlled asymmetric hydraulic cylinder were put forward. Then the model of hydraulic system was built and simulated with using of AMESim software. The results show that two schemes can well solve the problems of reversing pressure impact and pressure jump.