Bulk Modulus Measurement Using Acoustic Resonance
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Solution Overview
Problem
Existing methods for assessing the condition of pipes in fluid distribution systems rely on precise measurements of the bulk modulus of fluids, which can be challenging due to variations in air content, mineral content, and temperature, and often require calibration using pipes of known condition, which may not be readily available.
Innovation Solution
An apparatus and method that directly measure the bulk modulus of fluids by computing a frequency response function using a vibrational sensor and water property measurement system, allowing for accurate determination of bulk modulus values in the field by exciting the fluid sample and analyzing the resonant frequencies within a cylindrical cavity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods are used to measure bulk modulus, then calibration with pipes of known condition is required, but this increases device complexity and reduces measurement precision when calibration pipes are not available
Solution Approach 1:
The invention extracts the fluid sample from the pipe network and tests it in a separate cylindrical cavity, removing the dependency on calibration pipes of known condition. The bulk modulus measurement is performed on the isolated fluid sample itself, eliminating the need for external calibration references and simplifying the overall system.
Solution Approach 2:
The cylindrical cavity acts as an intermediary testing chamber that allows direct measurement of the fluid's bulk modulus through acoustic resonance. This intermediary structure enables the measurement without requiring the complex calibration system previously needed, as the cavity's known geometry provides the reference framework.
2Device complexity
If direct measurement methods are used, then calibration pipes of known condition are not needed, but measurement precision may be compromised without calibration
Solution Approach 1:
The invention uses acoustic vibration through a speaker to excite the fluid in the cylindrical cavity, creating resonance at specific frequencies. By measuring the resonant frequencies and using the known geometry of the cavity, the bulk modulus can be calculated directly with high precision without requiring calibration pipes, thus maintaining measurement accuracy while reducing system complexity.
3Reliability
If fluid properties vary due to air content, mineral content, and temperature, then accurate measurement becomes more difficult, but ignoring these variations reduces measurement reliability
Solution Approach 1:
The invention directly measures how the resonant frequency changes in response to variations in fluid properties such as air content, mineral content, and temperature. By using the acoustic resonance method, the system can detect and quantify these parameter changes, as each variation in fluid composition or temperature will shift the resonant frequency in a measurable way, allowing reliable bulk modulus determination despite property variations.
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 approach enables precise and accurate measurement of bulk modulus values, improving pipe condition assessment by accounting for variations in fluid properties, such as temperature and air content, without the need for calibration with pipes of known condition.
Implementation Method 1
a vibrational sensor coupled to an end plate of the second endcap and communicatively connected to a water property measurement system. The vibrational sensor is operable to, subsequent to the filling of the cylindrical cavity with the fluid sample, send a signal representative of sensed vibrations in the end plate of the second endcap to the water property measurement system
Implementation Method 2
The fluid sample in the cylindrical cavity is excited while signal data from a vibrational sensor coupled to the second endcap is recorded, the signal data representative of sensed vibrations in an end plate of the second endcap. A frequency response function is computed from the recorded signal data and a bulk modulus of the fluid sample is determined based on the computed frequency response function.
Data Source
AI summary
Apparatuses, methods, and systems for accurate measurement of the bulk modulus of a fluid in a fluid distribution system. An apparatus comprises a pipe, a first endcap, and a second endcap defining a cylindrical cavity, a means for filling the cylindrical cavity with a fluid sample, and a vibrational sensor coupled to an end plate of the second endcap and communicatively connected to a water property measurement system. The vibrational sensor is operable to, subsequent to the filling of the cylindrical cavity with the fluid sample, send a signal representative of sensed vibrations in the end plate of the second endcap to the water property measurement system while an end plate of the first endcap is excited. The water property measurement system computes a frequency response function from the signal and determines a bulk modulus value for the fluid sample based on the frequency response function.