Hearing Protector Spring Decoupling Noise Attenuation Comfort
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Solution Overview
Problem
Hearing protectors often face a trade-off between noise attenuation and wearing comfort, with designs that prioritize one aspect compromising the other, leading to reduced compliance and potential hearing impairment due to discomfort.
Innovation Solution
A hearing protector design featuring two earmuffs with a cushion, a cup, and a carrier connected via a spring element, allowing for mechanical decoupling that separates noise attenuation and comfort considerations, utilizing a mass-spring system to configure resonances and pressure independently, enhancing both noise reduction and user comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the mass of the hearing protector is increased to improve noise attenuation, then the noise attenuation performance is improved, but the wearing comfort deteriorates due to increased weight and pressure on the wearer's head
Solution Approach 1:
The hearing protector is divided into separate functional components: the cup assembly (providing noise attenuation) and the cushion assembly (providing comfort), connected by a spring element. This segmentation allows the heavy cup to be mechanically decoupled from the wearer's head, with only the lightweight cushion making contact, thus maintaining noise attenuation while reducing weight and pressure on the wearer.
Solution Approach 2:
A spring element acts as an intermediary between the heavy cup and the wearer's head. The spring mechanically transmits only the necessary sealing force while absorbing the weight of the cup, preventing the full mass from pressing against the wearer's head and ears, thereby maintaining both noise attenuation and wearing comfort.
2Object-affected harmful factors
If the pressure applied by the earmuffs is increased to improve noise attenuation, then the noise attenuation performance is improved, but the wearing comfort deteriorates due to skin irritations from excessive pressure
Solution Approach 1:
The system separates the functions of noise attenuation and pressure application. The cup provides noise attenuation without directly contacting the wearer, while the cushion separately provides the necessary sealing pressure. This segmentation allows optimization of each function independently, achieving adequate noise attenuation without excessive pressure on the skin.
Solution Approach 2:
The spring element serves as a mechanical intermediary that regulates the force transmission. It provides just enough force to ensure the cushion seals properly against the wearer's ear while preventing excessive force transmission that would cause skin irritations, thus balancing noise attenuation with wearing comfort.
3Object-affected harmful factors
If the hearing protector is designed for good noise attenuation, then the noise attenuation performance is improved, but the wearing comfort deteriorates leading to reduced compliance and potential hearing impairment
Solution Approach 1:
The hearing protector is segmented into a heavy noise-attenuating cup and a lightweight cushion, connected by a spring. This allows the cup to be optimized for noise attenuation without compromising wearability, as the cushion and spring system ensures comfort and encourages prolonged wearing, thereby improving compliance and preventing hearing impairment.
Solution Approach 2:
The spring element introduces dynamic characteristics to the system, allowing the cup to move independently and absorb vibrations. This dynamic decoupling reduces the transmission of vibrations and forces to the wearer's head, improving comfort and encouraging consistent use of the hearing protector for noise-sensitive applications.
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 decouples noise attenuation and comfort, allowing for customizable resonance frequencies and pressure distribution, resulting in improved wearing comfort while maintaining effective noise reduction across various frequencies.
Implementation Method 1
The carrier and the cushion form a first mass-spring system. The cup and the spring element form a second mass spring system. The spring element is configured and arranged such that the cup and the carrier are mechanically decoupled from each other.
Implementation Method 2
The required force or pressure for proper sealing of the cushion to the wearer's ear and skin, respectively, can be designed independent of the mass-spring system of the cup and spring element. Also, the force or pressure applied to the carrier by the headband and thereby to the cushion is not influencing the spring element or the cup, neither static compression nor increase of stiffness. It is noted that the carrier typically provides for the force required to keep the earmuffs securely in place, i. e. covering or sealing the wearer's ears reliably, the result being two configurable resonances, i. e. cushion—carrier and spring element—cup, respectively.
Data Source
AI summary
In a first aspect, the present disclosure relates to a hearing protector 10 including two earmuffs 12A, 12B each with a cushion 16A, 16B, a cup 14A, 14B and a carrier 24A, 24B. The hearing protector 10 further includes a headband 18, or alternatively two helmet mounts, with two earmuff attachment means 22A, 22B as well as a spring element 30A, 30B. The carrier 24A, 24B and the cushion 16A, 16B form a first mass-spring system. The cup 14A, 14B and the spring element 30A, 30B form a second mass spring system. The spring element 30A, 30B is configured and arranged such that the cup 14A, 14B and the carrier 24A, 24B are mechanically decoupled from each other. The advantage of such a hearing protector 10 is that the hearing protector 10 can be designed such that the aspects of comfort and noise attenuation can be addressed more independent of each other. Also, the force or pressure applied to the carrier by the headband 18, or alternatively by the helmet mounts, and thereby to the cushion 16A, 16B is not influencing the spring element 30A, 30B so as to design such a hearing protector 10 in a way that the properties such as noise attenuation and wearing comfort are not in conflict with each other. In a second aspect, the present disclosure relates to a method of retrofitting a hearing protector with a spring element 30A, 30B and a carrier 24A. 24B thereby providing the advantages and effects as laid out above.