Pressure Indicator Inlet Pipe Resonance Damping
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Solution Overview
Problem
Conventional pressure indicators can exhibit Helmholtz resonance, leading to energy draw and potential damage when external pressure varies at frequencies matching the resonant frequency of the enclosed volumes, making it challenging to maintain low amplitude resonance across a wide operational range without redesigning the system.
Innovation Solution
Incorporating a member within the inlet pipe that creates multiple communication paths of greater length than the nominal path length, reducing the effective length and diameter of the pipe, thereby increasing damping and shifting the natural frequency outside the operational range, thus minimizing resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dimensions of the enclosed volumes are chosen to avoid resonant frequencies, then Helmholtz resonance is reduced, but the adaptability across wide operational range is limited and redesign may be required
Solution Approach 1:
The patent changes the physical parameters of the inlet pipe by introducing a member that creates multiple communication paths. This increases the effective length and surface area of the pipe without changing the overall device dimensions, thereby reducing resonant frequency and damping oscillations while maintaining adaptability across operational ranges
2Reliability
If the inlet pipe length is increased to reduce resonant frequency, then Helmholtz resonance is avoided, but the device size increases and may not fit available space
Solution Approach 1:
The patent nests a member inside the inlet pipe that creates multiple internal communication paths. This effectively increases the pipe length and surface area without increasing the external dimensions of the device, allowing resonance control while maintaining compact size
Solution Approach 2:
The patent transitions from a single-dimensional pipe path to a multi-dimensional network of communication paths by introducing a member with multiple openings. This increases the effective path length and surface area within the same spatial footprint, reducing resonant frequency without increasing device volume
3Reliability
If a member with multiple communication paths is added to the inlet pipe, then damping is increased and resonant frequency is reduced, but the device complexity increases
Solution Approach 1:
The patent segments the single inlet pipe flow path into multiple parallel communication paths by introducing a member with multiple openings. This segmentation increases the total surface area and effective path length, enhancing damping effects while keeping the overall structure relatively simple
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 effectively reduces the likelihood of Helmholtz resonance, enhancing the pressure indicator's durability and adaptability across a wide range of operating conditions without incurring significant redesign or cost penalties.
Implementation Method 1
The effective diameter of the first inlet pipe with member may be less that the actual diameter of the first inlet pipe... viscous and frictional damping of pressure oscillation passing over and through the member will be increased
Implementation Method 2
viscous and frictional damping of pressure oscillation passing over and through the member will be increased
Implementation Method 3
A problem with this design is that the system may exhibit Helmholtz resonance. The Helmholtz resonance may occur at a frequency which is given approximately by: f=vnA/2pLV0
Implementation Method 4
The effective diameter of the first inlet pipe with member may be less that the actual diameter of the first inlet pipe... frictional damping of pressure oscillation passing over and through the member will be increased
Data Source
AI summary
A pressure indicator for indicating pressure of a pressure source. The indicator comprises a first reservoir which defines a first enclosed volume having a first inlet pipe for communication between the first enclosed volume and a first source of pressurised fluid. The first inlet pipe defines a nominal communication path length between the first enclosed volume and a first source of pressurised fluid. A member is provided in the first inlet pipe which defines one or more communication paths of greater length to that of the nominal communication path length.