Fluid Working System Syntactic Foam Compliance Volume
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Positive displacement machines in fluid working systems experience efficiency reductions, noise, and vibration due to pressure fluctuations, particularly in systems with limited hydraulic compliance, leading to ergonomic and operational issues.
Innovation Solution
Incorporating a compliance volume, such as syntactic foam, within the working chamber or cylinder to smooth pressure fluctuations by providing a non-dead volume that absorbs and reduces high-frequency components of the working fluid flow, thereby reducing noise and increasing system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a positive displacement machine operates cyclically to displace working fluid, then fluid displacement function is achieved, but pressure fluctuations occur causing noise and vibration
Solution Approach 1:
A compliance volume is incorporated into the system beforehand to cushion and absorb pressure fluctuations before they propagate through the hydraulic system. This proactive approach prevents noise and vibration rather than addressing them after they occur.
Solution Approach 2:
The compliance volume acts as an intermediary element between the positive displacement machine and the rest of the hydraulic system, absorbing pressure fluctuations and preventing them from affecting other components and generating noise.
2Strength
If hydraulic compliance is limited in the system, then system stiffness is maintained, but pressure ripples are amplified reducing component lifetime
Solution Approach 1:
The compliance volume provides beforehand cushioning to absorb pressure ripples before they can damage system components, thereby extending component lifetime while maintaining overall system stiffness through controlled compliance.
Solution Approach 2:
The compliance volume changes the hydraulic compliance parameter of the system, introducing localized flexibility that absorbs pressure fluctuations without significantly reducing the overall stiffness of the hydraulic system.
3Object-generated harmful factors
If compliance volume is added to smooth pressure fluctuations, then noise and vibration are reduced, but system complexity increases
Solution Approach 1:
The compliance volume is merged with existing system components such as the pump housing or cylinder, eliminating the need for separate compliance devices and reducing overall system complexity while still achieving noise and vibration reduction.
Solution Approach 2:
The compliance volume serves multiple functions simultaneously: it smooths pressure fluctuations, reduces noise and vibration, and can be integrated into existing components, thereby reducing the need for additional separate components and simplifying the overall system.
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 compliance volume effectively reduces pressure ripples and noise, enhancing the overall efficiency and longevity of system components by absorbing high-frequency components of the working fluid flow, thus mitigating the adverse effects of pressure fluctuations.
Implementation Method 1
a compliance volume smoothing pressure fluctuations of said working fluid within said fluid working system
Data Source
AI summary
A fluid working system such as a pump for displacing a working fluid such as hydraulic fluid or a motor using a working fluid is provided. The system may have a positive displacement machine which includes one or more working chamber with displacement means such as a cylinder with a reciprocating piston. There are also two or more fluid ports to allow the working fluid to flow into and out of the working chamber. The working fluid flows from one fluid port means to another either being forced to do so when pumped or moving the piston when functioning as an engine. The fluid working system has associated therewith a non-dead compliance volume of a material such as syntactic foam. This compliance volume acts to smooth any pressure fluctuations within the working fluid system.