Waveguide Design for Shear Wave Pattern Control
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Solution Overview
Problem
Existing methods struggle to transmit shear waves in a desired pattern to bulk-type media, as higher-order modes often superpose with the first mode, making it difficult to control the pattern of transmitted shear waves.
Innovation Solution
A waveguide with a vibrating portion, a transmitting portion, and a connecting portion is designed, where the vibrating portion is vibrated by a unit and has a plate shape, the transmitting portion is thicker and transmits shear waves to the bulk-type medium, and the connecting portion has varying thickness, allowing only the first mode of shear waves to be transmitted by adjusting the thicknesses and frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a vibrating unit directly transmits shear waves to a bulk-type medium, then the transmission of shear waves is achieved, but higher-order modes superpose with the first mode making it difficult to control the transmission pattern
Solution Approach 1:
A waveguide is introduced as an intermediary component between the vibrating unit and the bulk-type medium. The waveguide has a specific thickness design that allows it to transmit only shear waves of the first mode while blocking higher-order modes, thus controlling the transmission pattern without direct contact between the vibrating unit and the medium.
Solution Approach 2:
The thickness of the waveguide is specifically controlled to be within a range that enables it to transmit only the first mode of shear waves. By changing the thickness parameter of the waveguide, the transmission characteristics are optimized to eliminate higher-order modes while maintaining effective shear wave transmission to the bulk-type medium.
2Productivity
If the waveguide thickness is increased to transmit shear waves effectively, then transmission efficiency is improved, but higher-order modes are generated and cannot be blocked
Solution Approach 1:
The waveguide thickness is optimized to a specific range that balances transmission efficiency with mode control. This parameter optimization ensures that the waveguide is thick enough to transmit shear waves effectively to the bulk-type medium while remaining thin enough to block the generation and transmission of higher-order modes.
3Ease of operation
If existing methods are applied directly to bulk-type media, then the simple transmission method is maintained, but it is difficult to obtain a desired pattern of transmitted shear waves
Solution Approach 1:
The waveguide serves as a mediator that maintains the simplicity of the transmission method while enabling precise pattern control. The vibrating unit continues to generate shear waves in a straightforward manner, but the waveguide shapes and controls the transmission pattern as the waves pass through it to the bulk-type medium.
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 design effectively blocks higher-order modes, enabling the transmission of shear waves in a desired pattern and direction to bulk-type media, including high-temperature or viscous fluids, by ensuring only the first mode is propagated.
Implementation Method 1
meander coils which include a plurality of coil lines extending in a width direction of the vibrating portion on the insulator and are formed such that current flows in opposite directions along coil lines adjacent to each other, and a magnet which forms a magnetic field in the width direction of the vibrating portion, and when one or more meander coils selected from among the meander coils are supplied with current, portions of the vibrating portion corresponding to positions where the meander coils are disposed may be locally deformed, such that the shear waves are generated at the vibrating portion
Implementation Method 2
a transmitting portion which transmits shear waves generated by the vibrating unit to a bulk-type medium
Data Source
AI summary
The aim of the present invention is to provide a waveguide capable of transmitting shear waves in a desired pattern to a bulk-type medium, a vibrator, and a method of transmitting shear waves by using the vibrator. To this end, the present invention provides a waveguide including a vibrating portion that is vibrated by a vibrating unit, a transmitting portion that transmits shear waves generated by the vibrating unit to a bulk-type medium and is thicker than the vibrating portion, and a connecting portion that contacts both the vibrating portion and the transmitting portion and has a thickness varying from a portion contacting the vibrating portion to a portion contacting the transmitting portion. Also, the present invention provides a vibrator using the waveguide and a method of transmitting shear waves by using the vibrator.