A Three-Dimensional Finite Element Analysis Model for SH-SAW Torque Sensors
Chao Jiang1, Yanqin Chen2, Chongdu Cho3
1Department of Mechanical Engineering, Inha University, Incheon 22212, Korea. chiaojiang@inha.edu.
Sensors (Basel, Switzerland)
|October 19, 2019
Summary
This study presents a 3D-FEA model for shear horizontal surface acoustic wave (SH-SAW) torque sensors. Optimized Y-cut quartz substrates with gold layers effectively excite SH-SAWs, demonstrating linear torque sensing performance.
Area of Science:
- Acoustics
- Materials Science
- Sensor Technology
Background:
- Torque sensors are crucial for reliable torque transmission in drivelines.
- Shear horizontal surface acoustic wave (SH-SAW) sensors offer advantages like high velocity and Q-value, but require further research.
- Understanding SH-SAW characteristics and torque sensing modes is essential for sensor development.
Purpose of the Study:
- To develop a three-dimensional finite element analysis (3D-FEA) model for SH-SAW torque sensors.
- To investigate the influence of Y-cut quartz substrates and waveguide layer properties on SH-SAW generation.
- To analyze the torque sensing performance of the developed FEA model.
Main Methods:
- Utilized three-dimensional finite element analysis (3D-FEA) to model SH-SAW propagation.
- Investigated various Y-cut quartz substrate angles and waveguide layer materials (Au, Pt, Ti, SiO2).
- Analyzed the effect of waveguide layer thickness to wavelength ratios (h) on wave characteristics.
Main Results:
- Identified Y-cut quartz at approximately 36° with a gold (Au) layer (h=0.02-0.03) as optimal for SH-SAW excitation.
- Compared the performance of different substrate and waveguide configurations.
- The FEA model with a Y+36° quartz substrate and 0.025λ-thick gold layer showed perfect linearity between applied torque and sensed voltage.
Conclusions:
- The optimized SH-SAW torque sensor configuration demonstrates excellent performance.
- FEA modeling is a valuable tool for understanding and developing SH-SAW based sensors.
- This research contributes to the advancement of reliable and efficient torque sensing technologies.
Keywords:
quartzshear horizontal surface acoustic wave (SH-SAW)three-dimensional finite element analysis (3D-FEA)torque sensingMore Related Videos
Related Concept Videos
01:15Thin-Walled Hollow Shafts
505
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
505
01:09Transmission Shafts: Problem Solving
463
Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
Next, use bending moment diagrams for the shaft to...
Next, use bending moment diagrams for the shaft to...
463
01:18Stress Concentrations in Circular Shafts
490
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
490
01:19Net Torque Calculations
11.2K
When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to...
11.2K
01:15Design of Transmission Shafts - Stress Analysis
696
Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
696
01:18Stresses in a Shaft
794
The shaft PQ is subjected to a twisting force when equal and opposite torques are applied on either side. A section that cuts perpendicular to the shaft's axis at any arbitrary point R is examined to understand this. When the free-body diagram of the QR segment is analyzed, it reveals the shearing forces exerted by the PR portion onto the QR segment as the shaft experiences twisting.
Applying equilibrium conditions to the QR segment establishes that the internal shearing forces within the...
Applying equilibrium conditions to the QR segment establishes that the internal shearing forces within the...
794