Hydraulic actuators: cylinders



Properties:

.The cylinders have to be good quality steel with close tolerances.
There have to be good sealing both at the piston rod and at the cylinder.

.With time dirt may come in and damage the surfaces. This has to be possibly reduced.
In this case, the leakage will increase all the time.

Calculation of cylinders

1 Stick-slip
2 Transition
3 Normal behaviour

Hydraulic cylinders should be possibly operated in the 3rd region for ....etc

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to get information about the topic electroactive polymers full report ppt and related topic refer the page link bellow

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http://seminarsprojects.net/Thread-electroactive-polymers-full-report

http://seminarsprojects.net/Thread-electroactive-polymer-%E2%80%9Cartificial-muscle%E2%80%9D-operable-in-ultra-high-hydrostatic-pressure

http://seminarsprojects.net/Thread-electroactive-polymer-%E2%80%9Cartificial-muscle%E2%80%9D-operable-in-ultra-high-hydrostatic-pressure--21028 ....etc

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ELECTROACTIVE POLYMERS(EAP)
ABSTRACT
Electro active polymers are soft actuation materials that are fastly replacing the conventional actuating materials such as piezo electric crystals, motors, screws etc:- As the name suggests, they essentially consists of a ionic polymer back bone metallic composite having positive counter ions. On the application of an electric field or small voltage, these EAP s will bend towards the anode.
They have properties resembling human muscles and ar ....etc

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Since 1945 Parker Autoclave Engineers has designed and built premium quality valves, fittings and tubing. Parker Autoclave Engineers ball valve actuators can be supplied with a variety of features and options. Operators are supplied either pneumatic or electric actuated.
FEATURES
Use for remote and automatic operation.

Air-to-open/spring-to-close and air to open and close.

Limit switches or limit switches with visual indicators available.

High temperature options.

Stainless steel housings for corrosive applications.

Manual ove ....etc

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i need the ppt of miniature sensors and actuators of nanotechnology with mathematical,computer,electronical and mechanical component ....etc

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An actuator is a component of machines that is responsible for moving or controlling a mechanism or system.

An actuator requires a control signal and source of energy. The control signal is relatively low energy and may be electric voltage or current, pneumatic or hydraulic pressure, or even human power. The supplied main energy source may be electric current, hydraulic fluid pressure, or pneumatic pressure. When the control signal is received, the actuator responds by converting the energy into mechanical motion.

An actuator is the mecha ....etc

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Electroactive Polymer (EAP) Actuators


Electroactive Polymer Technology

Electroactive polymers (EAP) are promising as actuators in intelligent material
systems, where large deformations are required. Electromagnetic, piezoelectric
or shape memory alloy actuators are either too heavy, too complex or too slow
for such applications. EAP however are relatively lightweight, rather simple and
fast enough.
In particular, dielectric electroactive polymers were shown to have good ove ....etc

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Please visit the below given thread for more details

http://seminarsprojects.net/Thread-piezoelectric-actuator ....etc

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to get information about the topic electroactive polymers full report ppt and related topic refer the page link bellow

http://seminarsprojects.net/Thread-electroactive-polymer-eap-actuators

http://seminarsprojects.net/Thread-electroactive-polymers-full-report

http://seminarsprojects.net/Thread-electroactive-polymer-%E2%80%9Cartificial-muscle%E2%80%9D-operable-in-ultra-high-hydrostatic-pressure

http://seminarsprojects.net/Thread-electroactive-polymer-%E2%80%9Cartificial-muscle%E2%80%9D-operable-in-ultra-high-hydrostatic-pressure--2 ....etc

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Abstract

In paper the fundamental question about optimal interaction between the controlling stimuli generated by the active (powered) and the passive (unpowered) drives of the robotic systems have been studied. A mathematical statement of the problem has been proposed that is suitable to study this question for the semi-passively actuated n-degree-of-freedom robotic systems. The problem is formulated as an optimal control problem for n-degree-of-freedom mechanical system models a semi-passively actuated robot. We take into account the inter ....etc

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