Slide 5

The rotational servohydraulic actuator is used to apply torsional loads. It is driven by high pressure hydraulic fluid. The actuator has a built-in rotary variable differential transducer, or, RVDT to measure rotation. An attached servo-valve controls both the direction and volume of the hydraulic fluid into and out of the actuator. Vane type rotary actuators have the smallest possible weight to size ratio, fast response with no backlash and long life. The figure on the right shows the working principle of a double vane rotary actuator. Let's look at the mechanism of anticlockwise rotation of the actuator. High pressure oil is pumped inside the actuator from port I and the shaft begins to rotate in the anticlockwise direction. Opposite chambers in the actuator communicate through a hole in the shaft. Low pressure oil flows out the actuator through port II. Similarly, for clockwise rotation the direction of fluid flow is reversed.

Introduction

Chalk Talks
•Basic theory
•Testing
  system
•Engineered   materials
•Turkey bone

Virtual Tests
•Aluminum
•Turkey bone
•PMMA
•Cast iron

Test Data
•Aluminum
•Turkey bone
•PMMA
•Cast iron

Lab Manual
•Engineered   materials
-Instructions
-Data sheets
•Turkey bone
-Instructions
-Data sheets
•Entire lab
  manual (.doc) (.pdf)

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