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Pneumatic piston-cylinder actuators are widely applied in industry for a variety of automation and robotics field. For suppressing leakage, these actuators incorporate seal rings which meanwhile introduce friction and affect the positioning precision and output force. The friction reduction by ultrasonic vibration has got wide and deep investigations by global researchers, and been successfully implemented...
The nonlinear primary resonances of a pneumatic spring with simple harmonic excitations were studied by the method of nonlinear dynamics. Through testing, load curve of the pneumatic spring under a certain initial pressure was got. According to the test data, the relative elastic force was fitted to relative displacement by cube polynomial equation. The method of multiple scales was used to solve...
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