Contactless Object Property Determination via Sound Particle Velocity
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Solution Overview
Problem
Measuring vibrations in objects is challenging when attaching sensors distorts the vibrational mode, necessitating a contactless method to assess object properties without influencing mechanical behavior.
Innovation Solution
A system comprising multiple devices that determine sound particle velocity along straight lines perpendicular to the object surface, using acoustic sensors to measure pressure variations and calculate sound particle velocity, allowing for a contactless and non-invasive assessment of object properties by establishing a measurement grid that can cover entire surfaces simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are attached to the object surface to measure vibrations, then measurement precision is improved, but the mechanical behavior of the object is unduly influenced
Solution Approach 1:
The patent introduces air as an intermediary medium to transmit vibration information from the object surface to the sensors. Instead of direct contact, acoustic sensors measure sound particle velocity in the air gap, which carries vibration information without requiring physical attachment to the object surface, thus avoiding distortion of the vibrational mode.
Solution Approach 2:
The patent replaces the mechanical contact-based sensor attachment system with an acoustic field-based measurement system. By using acoustic sensors to detect sound particle velocity in the air gap, the system substitutes direct mechanical contact with non-contact acoustic measurement, eliminating the harmful influence of sensor attachment on object vibrations.
2Object-affected harmful factors
If contactless measurement methods are used to avoid distorting vibrations, then the object's natural vibrational behavior is preserved, but measurement precision may be compromised
Solution Approach 1:
The patent transitions from measuring vibrations directly at the object surface (zero-dimensional contact) to measuring sound particle velocity in the air gap (one-dimensional acoustic field measurement). This dimensional change allows non-contact measurement while maintaining precision through acoustic field analysis that captures vibration information without physical interference.
Solution Approach 2:
The patent changes the measurement parameter from direct surface displacement (requiring contact) to sound particle velocity in the air gap. By measuring the acoustic field parameters (pressure and particle velocity) rather than direct mechanical displacement, the system achieves contactless measurement with maintained precision through the relationship between acoustic fields and surface vibrations.
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
Enables the contactless determination of object properties, such as modulus of elasticity, with minimal distortion, facilitating quality control and defect detection by analyzing vibrations without attaching sensors directly to the object, thus preserving the object's natural vibrational behavior.
Implementation Method 1
a first device (12) which is configured to determine a first sound particle velocity along a first straight line (A), the first straight line (A) intersecting with a surface (16) of the object (16) at a first point
Implementation Method 2
using acoustic sensors to measure pressure variations and calculate sound particle velocity
Implementation Method 3
a transducer that converts electrical energy into mechanical energy and excites the object or the object surface to vibrate
Implementation Method 4
The system may further comprise a transducer that converts electrical energy into mechanical energy and excites the object or the object surface to vibrate
Implementation Method 5
the frequency may relate to the transducer or to the use or to the operation of the object and may be close to or may include a resonance frequency (eigenfrequency) of the object and/or harmonics thereof
Data Source
Figure 1~2
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Figure 5~6
AI summary
Provided is a system for determining properties of an object and a corresponding method. The system comprises a first device which is configured to determine a first sound particle velocity along a first straight line, the first straight line intersecting with a surface of the object at a first point and being perpendicular to the surface or to a tangent plane to the surface at the first point. The system further comprising a second device which is configured to determine a second sound particle velocity along a second straight line, the second straight line intersecting with a surface of the object at a second point and being perpendicular to the surface or to a tangent plane to the surface at the second point.