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A coupled fluid-mechanical dynamics analysis method is presented in this paper. A commercial simulation package is used for mechanical dynamics calculation, which employs user-developed dynamic-link library files as routine interface to enable data exchange with gas pressure calculation. This part is responsible for the calculation of mechanical motion, including the tripping of trip trigger, releasing...
The dissertation has researched the structure of eccentric shaft from the power end of the radial reciprocating piston pump, and has analyzed the unbalanced inertia force generated in the process of high-speed rotary motion. It has pointed out the requirement of dynamic balance design of the eccentric shaft, and has completed the dynamic balance design of the eccentric shaft. The ADAMS was used to...
There are many industrial applications where precise delivery of fluid required such as ratio blending, delivery system, etc. One of such application is petroleum product delivery system. As the price of these petroleum products is increasing day by day, it is important to deliver the exact demanded quantity of product to the customer. For such delivery systems the digital control valve is used. This...
In order to qualify the anti-shock performance of shipboard equipment and simulation actual underwater explosion(UNDEX) environment, a novel dual-wave shock test machine is developed. This machine is based on the concept of hydraulic drive system and it can generate a dual-wave shock acceleration meeting the specification defined in BV043/85. This paper establishes the simulation model of the hydraulic-actuate...
Hydraulic servo pump is extremely important to achieve high dynamic performance and large power density of distributed actuation systems in modern aircrafts. In this study, a piezo-hydraulic servo pump (PHSP) with multiple piezoelectric stacks (PZT stacks) is proposed. The key feature of this design is the development of a mutual active valve rectification method. Based on the novel rectification...
Study on the friction torque of diesel engine is quite important to the transient fuel control. For the complexity of the system, there is no effective model the friction torque. After further study on the diesel engine, the friction torque is divided into several components and different model was built for each component. The model is used for multi-cylinder, four stroke engine. In order to prove...
This paper is to build a reliable simulation model which is useful for the design of hydro-pneumatic suspension. To get a right simulation model, a test platform based on hydro-pneumatic suspension was set, several damping pores with different sizes are used in the experiment, pressures on both sides of damping pore and force on piston rod were collected. The simulation model of hydro-pneumatic suspension...
The crankshaft is one of the most important components of engine, it endures complex and alternate load and it is the key point and difficulty of the engine design. Dynamic characteristics of crankshaft has been abstractly analyzed its kinematics and dynamics. A model of crank-connecting rod mechanism had been built in the software of Pro/E and ADAMS. To get the minimum force acted on mounting base,...
In this paper, dynamic analysis and simulation are made for the pump-accumulator driving extruder. The dynamic and mathematic models are set up. The function of relationships between extruding force of the hydraulic system and displacement, velocity and acceleration of the piston are derived. Simulations and tests are also made for a practical 3150-ton horizontal extruder. It is shown that the simulation...
To optimize a swell compensator when a trailing suction hopper dredger (TSHD) is dredging at sea, the mathematical models were built about the effects of piston force, the distance of the piston movement, the speed of the piston movement, vessel motions and the cable-pulley system; the mathematical models proved that reducing the variation of cable tension force can lead to a smaller normal force...
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