Adjustable Quarter-Wave Tuner for Hydraulic Pump Noise
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Solution Overview
Problem
Hydraulic systems in work vehicles experience pressure ripples and noise due to pump operation, which are not effectively mitigated by existing technologies.
Innovation Solution
An adjustable quarter wave tuner is integrated into the hydraulic circuit, allowing its length to be adjusted based on sensed pressure to reduce noise across a range of frequencies, and is connected to actuators and pumps to minimize pressure ripples and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed-length quarter wave tuner is used, then noise reduction is effective at a specific frequency, but noise across a range of frequencies cannot be reduced
Solution Approach 1:
The patent applies the dynamics principle by making the quarter wave tuner length adjustable rather than fixed. The tuner includes a movable piston that can change the effective length of the tuning chamber, allowing the system to adapt to different operating frequencies. This dynamic adjustment capability enables noise reduction across a broader frequency range while maintaining a relatively simple overall structure.
2Adaptability or versatility
If the quarter wave tuner length is adjusted to reduce noise at different frequencies, then frequency adaptability improves, but system complexity increases
Solution Approach 1:
The patent implements the nested doll principle by placing a movable piston inside the tuning chamber. The piston can slide within the chamber to adjust the effective volume and length of the tuner. This nested configuration allows for length adjustment without requiring external components or complex mechanical linkages, thereby reducing overall system complexity while maintaining adaptability.
Solution Approach 2:
The system incorporates sensors that automatically detect pressure ripple frequency and control mechanisms that autonomously adjust the piston position to optimize noise reduction. This self-service capability eliminates the need for manual adjustment and reduces the complexity of external control systems, as the tuner automatically adapts to changing operating conditions.
3Object-affected harmful factors
If existing noise reduction technologies are used, then system simplicity is maintained, but pressure ripple and noise mitigation is ineffective
Solution Approach 1:
The patent introduces a quarter wave tuner as an intermediary component in the hydraulic circuit between the pump and the actuators. This tuner acts as a mediator that absorbs and dampens pressure ripples and noise generated by the pump, preventing them from propagating through the hydraulic system. The tuner's resonant chamber design specifically targets and mitigates harmful pressure fluctuations while maintaining relatively simple integration into the existing hydraulic circuit.
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 adjustable quarter wave tuner effectively reduces noise and pressure ripples in hydraulic systems, enhancing the operational stability and efficiency of work vehicles by dynamically adjusting its length in response to sensed pressures.
Implementation Method 1
An adjustable quarter wave tuner is connected to the hydraulic circuit. The adjustable quarter wave tuner has a length that is adjustable within a range of lengths to thereby reduce noise caused by the pump across a corresponding range of frequencies
Data Source
AI summary
A work vehicle has a chassis, and a member connected to the chassis for movement with respect to the chassis. An actuator is connected to the chassis and to the member to move the member with respect to the chassis. A hydraulic circuit is connected to the actuator and a pump pressurizes fluid in the hydraulic circuit. An adjustable quarter wave tuner is connected to the hydraulic circuit. The adjustable quarter wave tuner has a length that is adjustable within a range of lengths to thereby reduce noise caused by the pump across a corresponding range of frequencies. In some embodiments, the member is a linear actuator, such as a hydraulic cylinder. In other embodiments, the member is a rotary actuator, such as a hydraulic motor.