Pneumatic Actuator Friction Identification via Oscillation Control
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Solution Overview
Problem
Users face difficulties in determining and entering accurate friction and mass information for pneumatic actuators, leading to suboptimal interaction between compressed-air provision devices and actuators, which affects closed-loop position control accuracy and efficiency.
Innovation Solution
The system employs an assistance procedure that induces a sinusoidal oscillation movement in the actuator element to automatically detect and verify friction and mass information using pressure and position values, ensuring correct parameters are used for closed-loop position control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If users manually enter friction information and mass information, then the system requires user input, but the accuracy and correctness of the entered parameters cannot be guaranteed
Solution Approach 1:
The system performs self-characterization by automatically determining friction and mass information through an assistance procedure that induces oscillation movement and analyzes pressure and position data, eliminating the need for manual user input and ensuring accurate parameter identification
Solution Approach 2:
The system changes the operational state of the actuator by inducing oscillation movement with varying amplitude and frequency to extract friction and mass parameters from the dynamic response, transforming static parameter entry into dynamic parameter identification
2Reliability
If incorrect friction information or mass information is entered, then the system may operate with wrong parameters, but detecting and verifying the correctness is difficult
Solution Approach 1:
The system incorporates a verification step where the determined friction and mass information is fed back into the model and compared against measured data to confirm correctness, providing automatic feedback validation of the identified parameters
Solution Approach 2:
The system uses mechanical oscillation movement to excite the actuator system and analyzes the dynamic response characteristics to accurately identify friction and mass parameters, using vibration-based characterization to overcome the difficulty of parameter verification
3Measurement precision
If the system performs automatic parameter determination through oscillation movement, then parameter accuracy improves, but the commissioning process requires additional steps
Solution Approach 1:
The system performs preliminary characterization of the actuator by determining friction and mass information during the commissioning phase through automated assistance procedures, establishing accurate parameters before normal operation begins
Solution Approach 2:
The system uses periodic oscillation movement to excite the actuator during parameter determination, leveraging the periodic nature of oscillation to systematically extract friction and mass parameters through analysis of pressure and position data over multiple cycles
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures accurate and efficient closed-loop position control by automatically determining and verifying friction and mass information, improving interaction between the compressed-air provision device and pneumatic actuator, thereby enhancing positioning accuracy and speed.
Implementation Method 1
a compressed-air provision device (4) configured to carry out a closed-loop position control of the actuator element (3) by applying compressed air to the pneumatic actuator (2)
Implementation Method 2
to detect pressure values of the compressed air and position values of the actuator element during the oscillation movement
Implementation Method 3
to detect pressure values of the compressed air and position values of the actuator element during the oscillation movement
Implementation Method 4
to determine and/or verify the friction information and/or the mass information on the basis of the detected pressure values and the detected position values
Data Source
AI summary
A system including a pneumatic actuator having an actuator element, the system further including a compressed-air provision device which is configured to carry out a closed-loop position control of the actuator element by applying compressed air to the pneumatic actuator. The compressed-air provision device is further configured to carry out an assistance procedure in which the actuator element is set in an oscillation movement, pressure values and position values are detected, and, on the basis of the detected pressure values and the detected position values, friction information and/or mass information is determined and/or verified.