US-12626680-B2 - Systems and methods for flexural wave absorption bandpass filtering

Abstract

System, methods, and other embodiments described herein relate to absorbing flexural waves. In one embodiment, a system includes a longitudinally extending body that is subject to a flexural wave and a bandpass filter. The bandpass filter transmits a target flexural wave having a particular wavelength and blocks a non-target flexural wave. The bandpass filter includes at least two mechanical resonators coupled to a surface of the longitudinally extending body and aligned in a first linear array along a length dimension of the longitudinally extending body. The at least two mechanical resonators of the first linear array are separated by a distance based on the particular wavelength.

Inventors

• Xiaopeng Li
• Taehwa Lee
• Ziqi Yu

Assignees

• TOYOTA MOTOR ENGINEERING & MANUFACTURING NORTH AMERICA, INC.

Dates

Publication Date

20260512

Application Date

20230504

Claims (17)

1. 1 . A system, comprising: a longitudinally extending body that is subject to a flexural wave; a first bandpass filter, that transmits a target flexural wave having a particular wavelength and blocks a non-target flexural wave, comprising at least two mechanical resonators coupled to a surface of the longitudinally extending body and aligned in a first linear array along a length dimension of the longitudinally extending body, the at least two mechanical resonators being separated by a distance based on the particular wavelength and physical properties of the at least two mechanical resonators; and a second bandpass filter comprising at least two additional mechanical resonators, the second bandpass filter is decoupled from the first bandpass filter.
2. 2 . The system of claim 1 , wherein the at least two mechanical resonators are separated by a distance that is greater than 0.45λ, where λ is the particular wavelength.
3. 3 . The system of claim 1 , wherein the second bandpass filter comprising at least two additional mechanical resonators is aligned in a second linear array along the length dimension of the longitudinally extending body, the second bandpass filter: is parallel to the first bandpass filter along the length dimension of the longitudinally extending body; is asymmetrical to the first bandpass filter; and targets a second target flexural wave with a different wavelength than the target flexural wave.
4. 4 . The system of claim 1 , wherein each mechanical resonator comprises a channel in the surface of the longitudinally extending body.
5. 5 . The system of claim 1 , wherein each mechanical resonator comprises: a rigid mass component; and a connecting element connected to the rigid mass component, the connecting element maintains the rigid mass component at an elevated distance from the longitudinally extending body.
6. 6 . The system of claim 5 , wherein the connecting element comprises one of: a spring; a soft base component; and a rigid base component and an arm extending at an angle from the rigid base component.
7. 7 . The system of claim 6 , wherein: arms of the at least two mechanical resonators extend in a same direction along the length dimension of the longitudinally extending body.
8. 8 . The system of claim 6 , wherein: arms of the at least two mechanical resonators extend in opposite directions along the length dimension of the longitudinally extending body; and the rigid mass components of the at least two mechanical resonators are adjacent one another.
9. 9 . The system of claim 6 , wherein: arms of the at least two mechanical resonators extend in opposite directions along the length dimension of the longitudinally extending body; and the rigid mass components of the at least two mechanical resonators are separated from one another by respective arms.
10. 10 . A system, comprising: a longitudinally extending body that is subject to a flexural wave; a first bandpass filter, that transmits a target flexural wave having a particular wavelength and blocks a non-target flexural wave, comprising at least two mechanical resonators coupled to a surface of the longitudinally extending body and aligned in a linear array along a length dimension of the longitudinally extending body, the at least two mechanical resonators being separated by a distance: based on physical properties of the at least two mechanical resonators; that is greater than 0.45λ, where λ is the particular wavelength; and a second bandpass filter comprising at least two additional mechanical resonators, the second bandpass filter is decoupled from the first bandpass filter.
11. 11 . The system of claim 10 , wherein the second bandpass filter comprising at least two additional mechanical resonators is aligned in a second linear array along the length dimension of the longitudinally extending body, the second bandpass filter: is parallel to the first bandpass filter along the length dimension of the longitudinally extending body; is asymmetrical to the first bandpass filter; and targets a second target flexural wave with a different wavelength than the target flexural wave.
12. 12 . The system of claim 10 , wherein each mechanical resonator comprises a channel in the surface of the longitudinally extending body.
13. 13 . The system of claim 10 , wherein each mechanical resonator comprises: a rigid mass component; and a connecting element connected to the rigid mass component, the connecting element maintains the rigid mass component at an elevated distance from the longitudinally extending body.
14. 14 . The system of claim 13 , wherein the connecting element comprises one of: a spring; a soft base component; and a rigid base component and an arm extending at an angle from the rigid base component.
15. 15 . The system of claim 14 , wherein: arms of the at least two mechanical resonators extend in a same direction along the length dimension of the longitudinally extending body.
16. 16 . The system of claim 14 , wherein: arms of the at least two mechanical resonators extend in opposite directions along the length dimension of the longitudinally extending body; and the rigid mass components of the at least two mechanical resonators are adjacent to one another.
17. 17 . The system of claim 14 , wherein: arms of the at least two mechanical resonators extend in opposite directions along the length dimension of the longitudinally extending body; and the rigid mass components of the at least two mechanical resonators are separated from one another by respective arms.

Description

TECHNICAL FIELD The subject matter described herein relates, in general, to flexural wave absorption and, more particularly, to an absorption system that filters and transmits target flexural waves while blocking non-target waves. BACKGROUND Resonators are used in a variety of industries and for a variety of purposes. High strength-to-mass materials, such as aluminum, provide several advantages in many applications. For example, high strength-to-mass materials are used in vehicles to reduce a weight of the vehicle. However, these high strength-to-mass materials are particularly susceptible to flexural wave transmission. Bending or flexural waves propagating through a structure, such as a vehicle body, may damage the structure or generate unwanted noise in the surrounding environment. The unwanted noise and/or body damage is further exacerbated when the body is formed of a high strength-to-mass material. As such, in these applications, the body may be more prone to damage due to flexural waves and may result in less than desirable acoustic qualities. In this example, a resonator attached to the structure absorbs the flexural waves, thus negating the adverse effects of the propagating wave. In another example, a resonator may be part of an electrical system. A resonator may detect or generate a precise frequency for sensing, signal processing, and/or digital encoding. For example, a system may rely on sensor data to execute some functionality, such as detecting conditions in a surrounding environment. The sensor data should convey accurate environmental data for the system to perform as intended. If there is too much noise in the sensor data, the system may improperly perform or perform below a desired level. In this example, a resonator may filter out noise such that the system receives and acts upon accurate and reliable sensor data. SUMMARY In one embodiment, example systems and methods relate to improving flexural wave absorption by blocking non-target waves from propagating through a body while allowing target waves having a particular wavelength to pass through the body. In one embodiment, an absorption system for generating a flexural wave bandpass filter is disclosed. The absorption system includes a longitudinally extending body that is subject to a flexural wave. The system also includes a bandpass filter that transmits a target flexural wave having a particular wavelength and blocks a non-target flexural wave. The bandpass filter includes at least two mechanical resonators coupled to a surface of the longitudinally extending body and aligned in a first linear array along a length dimension of the longitudinally extending body. The at least two mechanical resonators of the first linear array are separated by a distance based on the particular wavelength. In one embodiment, an absorption system for generating a flexural wave bandpass filter is disclosed. The absorption system includes a longitudinally extending body that is subject to a flexural wave. The absorption system also includes a bandpass filter that transmits a target flexural wave having a particular wavelength and blocks a non-target flexural wave. The bandpass filter includes at least two mechanical resonators coupled to a surface of the longitudinally extending body and aligned in a linear array along a length dimension of the longitudinally extending body. The at least two mechanical resonators are separated by a distance that is greater than 0.45λ, where λ is the particular wavelength. In one embodiment, a method for filtering a flexural wave with a bandpass filter is disclosed. In one embodiment, the method includes receiving a target flexural wave having a particular wavelength at a longitudinally extending body having at least two mechanical resonators formed on a surface. The at least two mechanical resonators are spaced to form a bandpass filter for the target flexural wave. The method also includes 1) transmitting the target flexural wave that propagates through the longitudinally extending body and 2) reflecting a non-target flexural wave that propagates through the longitudinally extending body. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate various systems, methods, and other embodiments of the disclosure. It will be appreciated that the illustrated element boundaries (e.g., boxes, groups of boxes, or other shapes) in the figures represent one embodiment of the boundaries. In some embodiments, one element may be designed as multiple elements or multiple elements may be designed as one element. In some embodiments, an element shown as an internal component of another element may be implemented as an external component and vice versa. Furthermore, elements may not be drawn to scale. FIG. 1 illustrates one embodiment of a simplified absorption system for transmitting target waves through a body while preventing non-target wave propagat