1. The manipulators structure , operation principle and hydropneumatic system are described systematically in the paper.

2. Hydractive - Hydropneumatic is a type of automotive suspension system, invented by Citro?n, and fitted to Citro?n cars, as well as being adapted.

3. In the present paper, the pressure-pulse damping effect of the hydropneumatic accumulator is discussed and a measure to raise the damping effect is suggested.

4. A research method of the large deflection of the throttle slice of the hydropneumatic spring was presented.

5. The physical model and mathematical model are established for a multi spindled hydropneumatic balanced suspension.

6. The soaking unit has the configuration of being arranged along the internal side of the shell and a hydropneumatic dual-direction flow field.

7. The device mainly consists of connection flange, brake disc, braking caliper, bracing frame, force-multiplier pump, hydropneumatic pipeline and proportional control valve.

8. The feasibility and correctness of the parametric design for hydropneumatic recuperator are validated by an example.

9. Based on the modeling and experimental validation of the hydropneumatic spring, a nonlinear model of special vehicle active hydropneumatic suspension was developed.