Industrial Consultancy & Sponsored Research (IC&SR) , IIT Madras
Intruded Curved Neck Compact Helmholtz Resonator
Categories for this Invention
Category: Assistive, Test Equipment and Design Manufacturing
Industry: Building,Automobile,music industry
Application: In rooms, acoustic devices ,musical instruments.
Market: The global market size was valued at
US$ 31717.46 million in 2022 and is expected to expand at a CAGR of 12.25% reaching
US$ 63464.41 million by 2031.
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Problem Statement
- Generally, a Helmholtz resonator is a closed cavity with minimum one opening.
- The opening may be as short as the thickness of the cavity wall or long enough, called the neck, to adjoin the cavity.
- A Helmholtz resonator is described by the resonant frequency, and it is associated with four geometric parameters; cavity height, cavity diameter, neck length, and neck diameter.
- Cavity dimensions and the neck length have an inverse relationship in the resonance frequency calculation, whereas the neck diameter has a direct relationship.
- There is a need to provide a method for compact resonator that overcomes the problems.
Technology
- The instant invention [ Intruded bend neck in the Helmholtz resonator] aiming to reduce the resonant frequency while maintaining the overall size unchanged.
A Helmholtz Resonator comprises of
- Resonator cavity
- Intruded curved neck
- The spiral neck accommodates even a longer neck compared to a neck containing bends. Therefore, depending on the requirement, a resonator can be tuned to a low-frequency region
- Ascertaining equivalent straight neck length for the curved neck Helmholtz Resonator, where the curved part of the neck is converted into an equivalent straight length
- using the formula (𝑙 = 𝑟 × 𝜃) wherein r is the radius measured from the Centre,𝜃 is the angle
Key Features / Value Proposition
- This model of resonator were sketched as per ISO 10534 220 standards.
- The resonator were fabricated using a 3D Printer.
- The material used is Acrylonitrile-butadiene-styrene (ABS) plastic.
- The mouth of the resonator is excited with a harmonically varying normal velocity input of magnitude 1 mm/s and the resulting pressure is measured on the mouth’s surface.
- In this type of resonator, the neck has a constant cross-section throughout its length.
- Light in weight & less cost compared to other model of Helmholtz resonators.
- J,C,U are the available shapes in this model.
- Application in building and room acoustics, the automobile industry, the space Industry, transportation, the music industry etc.
Questions about this Technology?
Contact For Licensing
sm-marketing@imail.iitm.ac.in
ipoffice2@iitm.ac.in
Research Lab
Prof. Chandramouli P
Department of Mechanical Engineering
Intellectual Property
IITM IDF Ref. 2478
Patent No:IN 533420
Technology Readiness Level
TRL – 4
Technology validated in lab scale.