Shear-Type Vibration-Ultrasonic Composite Sensor for Multi-Parameter Fault Diagnosis
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Solution Overview
Problem
Current equipment fault diagnosis methods are limited in accuracy and unable to simultaneously and accurately obtain multiple physical quantity parameters, leading to poor comprehensive reflection of equipment state, and are prone to interference from noise and base strain due to their simple structure.
Innovation Solution
A shear-type vibration-ultrasonic composite sensor with a metal matching layer, normal and tangential piezoelectric elements, and a trumpet-shaped metal housing, which measures both ultrasonic and vibration acceleration signals with improved sensitivity and anti-interference performance, using a centrosymmetric structure and insulating springs to reduce noise influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a piezoelectric element is directly placed on a sensor base, then the structure is simple, but interference signals such as noise and base strain strongly influence measurement
Solution Approach 1:
The sensor is divided into functionally independent modules: ultrasonic detection module with normal piezoelectric elements and vibration detection module with tangential piezoelectric elements. Each module has its own dedicated piezoelectric elements arranged on a matching layer, preventing cross-interference and allowing separate optimization of each detection function.
Solution Approach 2:
A matching layer is introduced as an intermediary between the piezoelectric elements and the sensor base. This matching layer serves as a mechanical isolation medium that reduces the transmission of base strain and noise to the piezoelectric elements, thereby improving measurement accuracy while maintaining structural simplicity.
2Device complexity
If a single physical quantity detection method is used, then the detection method is simple, but the accuracy and fault type detection capability are limited
Solution Approach 1:
The sensor integrates multiple detection functions into a single device: normal piezoelectric elements detect ultrasonic signals for electrical fault detection, while tangential piezoelectric elements detect vibration signals for mechanical fault detection. This multi-functional design enables comprehensive equipment state monitoring without requiring multiple separate sensors.
Solution Approach 2:
The ultrasonic detection function and vibration detection function are merged into a single composite sensor structure. Both detection modules share common components such as the matching layer, sensor base, and housing, while maintaining independent piezoelectric element arrangements for each detection type, achieving both simplicity and comprehensive detection capability.
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 sensor achieves high-accuracy, multi-physical-quantity detection with enhanced stability, convenience, low cost, and high signal-to-noise ratio, effectively reducing interference and improving strain resistance.
Implementation Method 1
A first normal piezoelectric element, which includes a first negative electrode face clung to the upper surface and a first positive electrode face opposite to the first negative electrode face; A second normal piezoelectric element, which includes a second positive electrode face clung to the first positive electrode face via a conductive adhesive and a second negative electrode face opposite to the second positive electrode face, the first positive electrode face and the second positive electrode face being respectively connected with an ultrasonic signal output interface to output an ultrasonic signal
Implementation Method 2
A first tangential piezoelectric element, which has a first negative electrode surface attached to one side of the vibrating base and a first positive electrode surface opposite to the first negative electrode surface, the first positive electrode surface being attached to a first mass block; and A second tangential piezoelectric element, which has a second negative electrode surface attached to the other side of the vibrating base opposite to the one side and a second positive electrode surface opposite to the second negative electrode surface, the second positive electrode surface being attached to a second mass block, the first mass block and the second mass block being respectively connected with a vibration signal output interface to output a vibration signal
Data Source
AI summary
The present disclosure discloses a shear-type vibration-ultrasonic composite sensor and a measuring device. In the shear-type vibration-ultrasonic composite sensor, a metal matching layer includes an insulating layer arranged on a lower surface and a supporting pillar arranged on an upper surface, the metal matching layer is in contact with a to-be-detected object via the insulating layer, a first negative electrode face of a first normal piezoelectric element is attached to one side of the metal matching layer, a first positive electrode face of the first normal piezoelectric element is attached to a second positive electrode face of a second normal piezoelectric element, a second negative electrode face is attached to a first surface of a backing block, and a second surface of the backing block is provided with a metal housing.