Proportional Actuator Valve Groove Dynamics for Position Stability
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Solution Overview
Problem
Conventional pneumatic actuators face challenges in maintaining position under variable forces due to the need for adjusting pneumatic pressure, which often results in oscillations and overshooting, particularly with shift valves that have a constant cross-sectional area for air flow, compromising between reaction time and resonance oscillations.
Innovation Solution
A proportional actuator valve with a valve housing and slider, featuring grooves and bores that adjust the cross-sectional area for air flow based on the applied force, allowing for precise control of pneumatic pressure to maintain position and adjust the actuator's position proportionally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a shift valve with constant cross-sectional area is used, then the valve can provide quick reaction time, but it causes resonance oscillations and overshooting
Solution Approach 1:
The valve slider is made movable relative to the valve housing, allowing the cross-sectional area of the groove to dynamically change based on the actuator's position. This dynamic adjustment enables the valve to provide quick reaction when needed while reducing air flow as the actuator approaches the target position, preventing overshooting and oscillations.
Solution Approach 2:
The cross-sectional area of the groove is changed as a variable parameter rather than being constant. By varying the cross-sectional area according to the actuator's position, the valve can adapt the air flow rate to match the control requirements at different stages of actuator movement, resolving the contradiction between quick reaction and position stability.
2Productivity
If the cross-sectional area of the valve is made larger, then quick reaction is achieved, but resonance oscillations occur
Solution Approach 1:
Instead of using a fixed large cross-sectional area, the invention uses a dynamic cross-sectional area that changes with valve slider position. The groove's cross-sectional area can be large when the actuator is far from the target (enabling quick response) and becomes smaller as the actuator approaches the target (preventing oscillations), thus resolving the contradiction.
3Reliability
If pneumatic pressure is increased to maintain position under increased force, then position maintenance is improved, but oscillations occur due to pressure adjustment delays
Solution Approach 1:
The valve slider moves with the actuator, providing direct feedback about the actuator's position. This feedback mechanism allows the valve to automatically adjust the cross-sectional area and air flow rate in response to position changes, enabling smooth and timely pneumatic pressure adjustment that maintains position reliability while preventing oscillations.
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
The solution reduces oscillations and enhances response time by providing proportional pneumatic pressure adjustment, ensuring accurate position maintenance and adjustment without overshooting, thereby improving the actuator's stability and control under varying forces.
Implementation Method 1
The proportional actuator valve controls the supply of air to and from the pneumatic actuator. The cross sectional area open for air flow is determined by a change in the first force acting on the element.
Data Source
Figure 1~2
Figure 3~4
Figure 5a~5b
AI summary
A proportional actuator valve (110) adapted for position control and position adjustment is provided. The proportional actuator valve (110) includes a valve housing (112) having at least two chambers (324, 325). The chambers are separated by one or more sealing members (322). A valve slider (113) is provided that is movable in the valve housing (112). One or more grooves (329) are formed in the valve slider (113). The one or more grooves (329) pneumatically communicate with the two chambers (324, 325) of the valve housing (112). One or more bores (327, 328) are also formed in the valve slider (113). The one or more bores (327, 328) pneumatically communicate with the one or more grooves (329). Movement of the valve slider (113) relative to the valve housing (112) provides a pneumatic valve action.