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In process industries, compressor plants provide process fluids with certain flows and pressures. The plant behavior may change over the entire life cycle due to component-specific time-variable factors. Control valves applied in compressor plants are affected by time-variable factors. Their modeling with consideration of specific time-variable factors is described in this paper. Control valves ensure...
In the control of traditional hydraulic systems, there will be large pressure fluctuations for the ordinary hydraulic cylinders in the condition of varying load. For this case, we design a four-chamber hydraulic cylinder. By using the hollow rod as another cylinder body, we make two-chamber ordinary hydraulic cylinder into four-chambers. In the control of digital fluid power systems, the number of...
The paper summarises the simulation study of a magnetorheological damper prototype operated in squeeze mode (MRSQD). The aim of the study is to show that the MRSQD can be effectively employed in the engine mount for vibration reduction. The material covers description of the device and selected simulation results which present: the performance figure of the MRSQD complemented by FE calculations of...
The article reviews the design of actuators of vibrations seismic sources, their advantages and disadvantages. The conclusion about the prospects of the elastic sheaths use is made.
Due to their compact and simple design, axial piston pumps are widely used in hydraulic systems. The piston/cylinder lubricating interface is one of the most critical design elements in axial piston pumps, which fulfills the bearing and sealing function simultaneously. Also it is the main source of both friction and volumetric powerloss. In order to realize the optimal design of efficient and reliable...
Deep-sea is the last part of ocean unexplored by human, which is rich not only in oil and gas resources but also in mineral and biological resources. To date, deep-sea exploration has become one of the international research focuses and frontiers. Pressure-retaining sampler is the important equipment used for collection of high-fidelity fluid samples at deep-sea, called sampler for short, which is...
A functional scale prototype has been constructed for a single-piston pump (SPP) that will be used as a building block in the core technology of a novel wave energy converter termed the Ocean Grazer: the multi-pump, multi-piston power take-off (MP2PTO) system. Experimental measurements performed with this scale prototype show that volumetric losses in the pumping system dictate its total efficiency,...
A machine hosted intelligent operator interface is essential for ‘man in loop’ type tele-operated systems with slave located away from the master-side-operator. A fluidics inspired model has been devised to support intelligent human-machine interface on master side of such system. The model is used to activate robot's work environment by encoding workspace. It is instrumental in creation of active...
Variable displacement speed regulation is a good method for hydraulic propulsion system compared with throttle speed regulation and high speed on/off valve speed regulation, however the minimum variable displacement motor we can get is about 28cc/r, which is too large for a light or medium weight ROV. The variable effective piston stroke (VEPS) motor is a kind of virtual variable displacement (WD)...
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...
This paper introduces the application of the viscoelastic dampers and analyses its working principle and performance in structural engineering, meanwhile the author gives a kinetic model which is suitable for structural analysis by referring to a concrete example, and compares the largest shear layer of the structure Dampers, and finally the author concludes that the systematic anti-quake of the structure...
This work first provides an overview of haptic gloves found in the literature, with a focus on their applications and their requirements. This information is then used to justify the use of Magnetorheological Fluid (MRF), a smart fluid which reversibly changes viscosity proportionally to an applied magnetic field, to effect the force feedback in a haptic glove. This is followed by the development...
Thinking of structure parameters, such as area of theittling orifice, fit clearance between piston spherical surface and cylinder wall, the model of hydraulic buffer used for track vehicle was built, dynamic characteristic and influencing factor of hydraulic buffer was simulated. A hydraulic buffer used in a type of track vehicle was test in hydraulic buffer performance rig. Results show hydraulic...
Flexible fluidic actuators present a lot of nice features regarding applications in the medical field and in the field of robotics. For example, they own a natural compliance and they can be very lightweight. Besides, an interesting measuring concept seems to be applicable to them: it is possible to determine and control the position of the actuator and the force it develops thanks to the measures...
Applications where a microsystem has to interface with the outside world are often face the rather small force output or stroke that a typical microfabricated actuator can generate. However, microscale piston-cylinder pneumatic or hydraulic actuators offer a significant improvement of the stroke and force output of microactuators. For the first time, a process is presented that enables batch fabrication...
This study presents the development and validation of an analytic dynamic model of the brake apply system of a vehicle. The brake apply system model includes the brake pedal, vacuum booster, master cylinder and proportioner valves; the interactions with the wheel brake system, the front and rear brakes are included by modelling the compliance of the caliper and the drum brakes. Laboratory experiments...
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