Pressure Sensor Sense Line Resonance Mitigation
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Solution Overview
Problem
Pressure ripples generated by external gear pumps in fluid flow systems can lead to inaccurate pressure readings in pressure sensors due to resonance, causing erroneous signals.
Innovation Solution
The implementation of a pressure sensor system with multiple sense lines, each having distinct resonant frequencies, lengths, and hydraulic diameters, ensuring that at least one sensor provides accurate readings by avoiding simultaneous resonance and overlapping signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single pressure sensor is used in the fluid system, then the device complexity is low, but the measurement precision deteriorates due to pressure ripple resonance
Solution Approach 1:
The pressure sensing function is segmented into multiple independent sensors (first pressure sensor and second pressure sensor) with different resonant frequencies. Each sensor operates independently on its own sense line, allowing the system to segment the measurement task across multiple components with distinct characteristics, thereby improving overall measurement accuracy by avoiding simultaneous resonance.
Solution Approach 2:
The resonant frequency parameter of each sense line is deliberately changed to be different from one another. The first sense line has a first resonant frequency and the second sense line has a second resonant frequency, ensuring that when pressure ripples occur at certain frequencies, at least one sensor will not be in resonance and can provide accurate measurements.
2Reliability
If multiple pressure sensors with different resonant frequencies are deployed, then the reliability of pressure measurement improves, but the device complexity increases
Solution Approach 1:
The pressure measurement function is divided into multiple independent sensing channels, each with its own sensor and sense line having distinct resonant characteristics. This segmentation allows the system to maintain reliability through diversity while keeping each individual sensor relatively simple.
Solution Approach 2:
The system exploits the periodic nature of pressure ripples from the gear pump by designing sensors with different resonant frequencies. When pressure ripples occur at specific frequencies, at least one sensor will operate outside its resonant frequency, providing accurate periodic measurements despite the presence of ripple-induced vibrations.
3Measurement precision
If sense lines are designed with different lengths and hydraulic diameters, then the resonant frequencies are differentiated to avoid simultaneous resonance, but the manufacturing precision requirements increase
Solution Approach 1:
Multiple geometric parameters of the sense lines (length, hydraulic diameter) are changed to achieve different resonant frequencies. By adjusting these dimensions, the system ensures that each sense line has a unique resonant characteristic, allowing accurate pressure measurement across a range of operating conditions.
Solution Approach 2:
The sense lines are designed with dynamic resonant characteristics that respond differently to pressure ripple frequencies. By creating sense lines with different natural frequencies through dimensional variations, the system dynamically adapts to different operating conditions, ensuring at least one sensor remains accurate regardless of the dominant ripple frequency.
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
This configuration ensures continuous, accurate pressure signal measurement across varying pump speeds and reduces the likelihood of erroneous readings by preventing simultaneous resonance in the sensors, providing a clean signal at all times.
Implementation Method 1
The first sense line has a first resonant frequency and the second sense line has a second resonant frequency. The second resonant frequency is different than the first resonant frequency.
Data Source
AI summary
A fluid flow arrangement includes a manifold defining a fluid passage. A pressure sensor system is in fluid communication with the fluid passage. The pressure sensor system has a first sensor arranged along a first sense line and a second sensor arranged along a second sense line. The first and second sense lines are in fluid communication with the fluid passage. The first sense line has a first resonant frequency and the second sense line has a second resonant frequency. The second resonant frequency is different than the first resonant frequency.