Hydraulic Boom Actuator Drift Compensation Under Vibration Damping
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Solution Overview
Problem
Hydraulic systems in machines with long booms or elongate members face issues with mass-induced vibration, which causes undesirable 'drift' in the position of hydraulic actuators, necessitating re-positioning by operators due to existing damping systems that fail to effectively manage this vibration without inducing movement errors.
Innovation Solution
A system that compensates for drift by adjusting the flow rate of hydraulic fluid in the actuator's chambers based on measured positions or pressures, using control valves and processing units to calculate and implement the necessary flow rates to counteract the effects of mass-induced vibration, thereby maintaining accurate positioning of machine components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If damping systems are used to reduce mass-induced vibration in long booms, then vibration is reduced, but hydraulic actuator drift occurs causing positioning errors
Solution Approach 1:
The system uses sensors to detect the position of the elongate member and feeds this information back to the control system. The control system calculates the drift based on the difference between expected and actual positions, then adjusts hydraulic fluid flow rates to compensate for the drift and maintain accurate positioning.
Solution Approach 2:
The system dynamically changes the flow rate parameter of hydraulic fluid to the actuators based on detected drift conditions. By adjusting the flow rate in response to measured position deviations, the system compensates for drift while maintaining the damping effect.
2Stability of the object's composition
If damping systems are used to reduce mass-induced vibration, then vibration is reduced, but continuous operator intervention is required to re-position components
Solution Approach 1:
The system performs self-correction by automatically detecting drift through sensors and adjusting hydraulic fluid flow rates without operator intervention. The control system continuously monitors position and makes real-time adjustments to maintain accurate positioning, eliminating the need for manual re-positioning.
Solution Approach 2:
The closed-loop feedback system continuously monitors the position of machine components and automatically adjusts actuator flow rates to compensate for drift, replacing the need for continuous operator intervention with an automated control mechanism.
3Manufacturing precision
If hydraulic fluid flow is increased to counteract drift, then positioning accuracy is maintained, but energy consumption increases
Solution Approach 1:
The system applies hydraulic fluid flow adjustment only to the extent necessary to compensate for detected drift, rather than continuously maximizing flow. The control system calculates the minimal required flow rate to maintain positioning accuracy, avoiding excessive energy consumption while still achieving the positioning goal.
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 system effectively reduces or eliminates drift caused by mass-induced vibration, ensuring precise positioning of machine components without the need for continuous operator intervention, by dynamically adjusting hydraulic fluid flow rates in response to measured parameters.
Implementation Method 1
a hydraulic actuator having a piston and a cylinder that defines a load holding chamber and a non-load holding chamber. A control valve is in fluid communication with the load holding chamber and the non-load holding chamber
Implementation Method 2
systems for damping mass-induced vibration in machines... damping of mass-induced vibration
Data Source
AI summary
A system for compensating for drift or movement of a hydraulic actuator connected to a machine's boom or similar elongate member that is caused, at least in part, by damping of mass-induced vibration. The system comprises a processing unit and a plurality of sensors operable to collect data from a control valve connected to an actuator's load holding chamber and to calculate additional volume present therein due to vibration damping. Using the calculated additional volume, the processing unit determines a hydraulic fluid flow rate appropriate to substantially reduce or eliminate the additional volume. The processing unit combines this flow rate with the hydraulic fluid flow rate necessary to cause operation of the actuator in response to the machine's operator input, and provides signals to the control valve causing actuation of the valve to output hydraulic fluid to the actuator at a rate equal to the combined flow rates.