Segmented Hydraulic Snubber Insert for Oil Line Pressure Transients
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Solution Overview
Problem
Existing hydraulic snubbers struggle to effectively attenuate sharp pressure transients in gas turbine engines, particularly in oil lines where temperature and viscosity variations complicate achieving sufficient attenuation while maintaining sensor response, and are limited by cost, durability, maintenance, and weight considerations.
Innovation Solution
A hydraulic snubber insert with an elongated stem and transversally extending segments, each with apertures, is introduced into the liquid carrying line, allowing for frictional engagement and adaptable to curvilinear lines, providing adjustable attenuation and phase offset through varying orifice geometry and number.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing pressure snubbers are used to attenuate sharp pressure transients, then pressure transient attenuation is achieved, but sensor response is compromised and the device is sensitive to oil temperature and viscosity variations
Solution Approach 1:
The snubber device is divided into multiple segments that can be independently adjusted along the stem, allowing each segment to contribute differently to pressure transient attenuation while maintaining sensor response. The segments can be positioned at different locations to optimize performance for specific frequency ranges.
Solution Approach 2:
The snubber incorporates adjustable segments that can be repositioned along the stem to dynamically adapt to different operating conditions, oil viscosities, and temperature variations. This dynamic adjustability allows optimization of both attenuation performance and sensor response for each specific application.
2Reliability
If pressure snubbers are designed for effective pressure transient attenuation, then attenuation performance is improved, but cost, weight, and maintenance requirements increase
Solution Approach 1:
The snubber design applies attenuation features locally at specific segments rather than throughout the entire device. By concentrating the attenuation functionality in discrete segments that can be selectively positioned, the overall weight is reduced while maintaining effective pressure transient attenuation where most needed.
Solution Approach 2:
The modular segment design allows individual segments to be replaced or adjusted without replacing the entire snubber assembly, reducing maintenance costs and extending the overall service life of the device while maintaining effective attenuation performance.
3Adaptability or versatility
If pressure snubbers are designed to work across varying oil temperatures and viscosities, then adaptability is improved, but device complexity increases
Solution Approach 1:
The snubber allows adjustment of segment positions and configurations to change the effective parameters of the device in response to varying oil temperature and viscosity conditions. By modifying the physical arrangement of segments rather than the material properties, the device adapts to different operating conditions without requiring complex temperature-compensating mechanisms.
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 attenuates pressure transients across a range of oil temperatures and frequencies, ensuring accurate sensor readings and reducing maintenance burdens, while being cost-effective and lightweight.
Implementation Method 1
pushing at least one segment in friction sliding engagement along an inner wall of the liquid line via a stem
Data Source
AI summary
The hydraulic snubber insert can have an elongated stem and at least one segment extending transversally from the stem, each segment having a size and shape mating a cross-sectional size and shape of the liquid carrying line, and at least one aperture, the insert being configured for the at least one segment to be pushable snugly into the liquid carrying line and pullable out from the liquid carrying line via the stem.