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Why is Frequency Response of the Servo Critical to Motion Base Platform Design?

Posted by Rachel Baker on Jan 24, 2017 5:26:57 PM

Why is frequency response of a servo critial to motion base design? Why is it even required? The fact is, the better the frequency response of the servo, the better performance of the motion base platform. 

In the simpliest terms, the motion base must follow the input properly. So if the motion base is to follow the commands from a Host computer in a full-flight simulator, and the pilot response is about 2Hz or less, the motion base needs to have >5˚ at 2Hz of phase shift so that the motion base accurately tracks the signal from the Host Computer flight model. It is required as the phase loss of the motion base affects the stability of the pilot's control loop.

The Engineering Team at Servos & Simulation, Inc., analyzed the performance of one of our motion base designs. The plots for the performance show the maximum position as a function of frequency, the maximum velocities as a function of frequency, and the maximum accelerations as a function of frequency. The servo has an inner rate loop using the encoder on the motor for feedback allowing the servo to have a bandwidth of more than 40 Hz. The outer loop is a position loop with a bandwidth of 4 Hz. The position loop gain is limited by the gain available in the drive amplifier (power amplifier that drives the motor). Servos’ engineers add electronics to the servos and increase the gain by at least a factor of 4 which increases the position loop bandwidth to 16 Hz.

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Tags: motion control, frequency response of a motion base platform servo, motion platform software

How to Precisely Control a Motion Base Platforms with Software?

Posted by Rachel Baker on Jan 24, 2017 5:19:07 PM

How does one precisely control a motion base so that the user can know where the motion base is in space and can modify where the centroid of the moving platform coordinate system is in space? Servos and Simulation’s engineers were recently presented with that exact problem. How did we accomplish this? Read below.

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About Servos & Simulation, Inc

Committed to being your world-class partner of intelligent servo systems, Servos & Simulation uses the power of science, innovation and forward thinking engineering to provide you cutting-edge technology for simulation and beyond! Since pioneering the first all electric digital control loader in 1990, Servos & Simulation has been there at every turn to deliver reliable products and services to its customers.

Thinking beyond the traditional, Servos & Simulation is constantly creating new solutions and services for its customers in all industries. Moving your world means more than manufacturing a product that fits your needs; it means ease of business with complete support and developing tools to assist you in every phase of the design process.


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