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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...
Vacuum Circuit Breaker (VCB) consists of the main frame with the operating mechanism and the main circuits including VI (Vacuum Interrupter). Especially, a VCB for the generator protection, which is used in a power plant, requires very large contact spring force because it has to be able to withstand the high short circuit current. In order to release closing energy of VCB, the cam type mechanism...
When quadrupedal robots execute locomotion, their interactions with the ground surface will make themselves unstable without careful compliance control for each leg. This paper presents a control method which uses a virtual leg compliance with instantaneous reflexes to external disturbance to obtain the self-stabilization for legged robots. Each leg was modeled as two sets of virtual spring and damper...
Based on the characters of repulsive force actuator for its fast speed in the opening and closing process, a kind of new-type fast circuit breaker energized by fault current was designed in this paper. With bus shunt as excitation current, double coil tandem repulsive force actuator and permanent magnetic actuator were composed together. This hybrid circuit breaker with new-type of excitation doesn't...
In this paper, we report the simulation result of a precise 3-axial servo controller for a positioning mechanism in an inchworm mobile mechanism. Also, we describe the design of bang-bang controller for θ-axis that is required for developing 3-axial controller. The inchworm mobile mechanism is composed of 6 piezoelectric actuators (PAs) and a pair of electromagnets (EMs). If one EM is fixed to a ferromagnetic...
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...
Over flow protection valve is the key equipment to protect thydraulic system with large potential energy, but irreversible malfunction may occur on valve when it under shock condition. Therefore the anti-shock design of the valve is critical. Considering the two stage structure of the valve, mathematic model of over flow protection valve is established. FLUENT is introduced to calculate the flow field...
The piezoelectric actuator is a voltage spring system that behaves in similar characteristic to mechanical mass spring system. It converts electrical signal to physical displacement. The displacements profile of the piezoelectric actuator shifts due to hysteresis and creep during actuation. Numerous equations were used to describe model of actuator in the past. In this work, we presented the behaviour...
This article proposes a new design of a 3D unfolded/tightened mechanism based on the spine structure of golden tree snake, which can realize torsion and bending. Inspired by golden tree snake vertebrae space deformation characteristics, analyzing the anatomy characteristics of the golden tree snake spine bone and muscle distribution characteristics, The bionic mechanism and drive unit can drive the...
The pantograph and the catenary perform the current collection process in electrical railway systems. In such systems, the main purpose is to improve the quality of current collection. Many factors and parameters can affect the interaction between the pantograph and the catenary. Internal or external factors affect the dynamic behavior of the system and lead to parameter variations. In practical applications,...
For solve the vibration isolation problem of heavy-load fracturing truck equipment, this paper puts forward a new type of design proposal of the vibration isolation device. At the same time, based on the theory of vibration isolation and actual parameters of the 3000HP fracturing truck vehicle-loaded equipment, finite element analysis, which is about the static and dynamic characteristics of the new...
In order to research the motion performance of vortex rings umbrella, finite element analytical approach is integrated to realize the complicated time varying motion mathematical model of vortex rings umbrella, as well as implements simulation and conformity validation for the model. At first, particle system is utilized to construct three-dimensional geometrical model of vortex rings umbrella according...
Analysis of open type wharf berthing condition is a complex process. It is hardly to simulate the environment and test results, which are consistent with the actual situation with physical model. In this paper, ship-mooring test during mooring is conducted applying the Large Ship Maneuvering Simulation Platform on the basis of the hydrological, meteorological and underwater terrain data. Combined...
This paper deals with two dimensional base-isolating device for sick person's bed in ambulance. This device does the reduction response acceleration by using pendulum type inclination chassis on horizontal direction. And, this device does the reduction of relative displacement and response acceleration by using restorative force from compression spring and friction force on vertical direction too...
The dynamics simulation prototype of floating automatic rifle was established. The mathematical-physical model of a kind of friction buffer that includes several friction loops and a buffer spring are developed. The experimental results agree well with the theoretical results and the simulation results. The obtained results are of great importance to improve the design quality of the automatic weapons,...
This article discussed the compensation characteristic of multi-way valve outlet pressure compensation in crane hydraulic system. The author using the simulation software AMEsim to two working loop to build a simulation model, with a certain type multi-way valve determine parameters, draw a series of simulation results. This article aims at explaining the characteristic and principle of the outlet...
Stiffness is one of the most important factors to vibration isolation system. Paper established a finite element model of the air spring, used nonlinear finite element method to analysis the rectangular shape air spring's stiffness. By considering the nonlinearity of the rubber-cord composite material, the geometric nonlinear process caused by large deformation and the nonlinear contact between the...
We demonstrate in simulation that active force control applied to a passive spring-mass model for walking and running attenuates disturbances, while maintaining the energy economy of a completely passive system during steady-state operation. It is well known that spring-mass models approximate steady-state animal running, but these passive dynamic models are sensitive to disturbances that animals...
This paper proposes a new actuator system using a movable pulley for a bio-mimetic system and wearable robot applications, which is able to store energy in advance and to release it in such a way to satisfy desired speed and force control performances, simultaneously. Since new actuator system consists of two motors (dual-motors), a movable pulley, and series spring connection for high speed/force...
With the desire bring more comfort and safety to disabled drivers, new technologies have been deemed appropriate for the development of innovative driving assistance. This paper describes the possibility of integrating these technologies for the development of a positive interacting system with disabled drivers. In this context, we suggest a new solution for a braking device that aims at helping paraplegic...
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