Related Experiment Video
Updated: Mar 9, 2026

07:47
Use of Sacrificial Nanoparticles to Remove the Effects of Shot-noise in Contact Holes Fabricated by E-beam Lithography
Published on: February 12, 2017
7.6K
Engineering out the noise.
Kurt Yankaskas1, Raymond Fischer2, Jesse Spence2
1ONR, United States.
Hearing Research
|January 13, 2017
Summary
The US Navy is exploring non-hearing protection strategies to reduce noise exposure and prevent hearing loss for warfighters. These methods improve onboard quality of life and enhance mission performance.
Area of Science:
- Naval Engineering
- Occupational Health
- Acoustics
Background:
- Noise-induced hearing loss (NIHL) is a significant concern for US Navy and Marine Corps personnel.
- Personal hearing protection (PHP) has limitations in comfort and effectiveness, particularly at low frequencies.
- Improper use of PHP further compromises its efficacy.
Purpose of the Study:
- To investigate and describe non-hearing protection methods for mitigating noise exposure in naval environments.
- To present strategies that complement or replace traditional hearing protection.
- To align with updated military standards for noise control.
Main Methods:
- Focus on inherent noise reduction through ship design and advanced noise control engineering.
- Implementation of programmatic changes and proper vessel planning.
- Adherence to revised standards such as Mil-Std 1474E, Appendix F.
Main Results:
- Non-hearing protection methods offer effective noise mitigation, especially in lower frequency ranges.
- These strategies enhance warfighter performance and onboard quality of life.
- Updated military standards support these advanced noise control approaches.
Conclusions:
- The US Navy is actively implementing comprehensive noise control strategies beyond traditional hearing protection.
- These initiatives aim to significantly reduce NIHL risk and improve overall operational effectiveness.
- The described methods represent a shift towards integrated noise management in naval operations.
Related Concept Videos
Design Example
611
The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
611
Mechanical Efficiency of Real Machines
1.4K
The mechanical efficiency of a machine is a fundamental concept that describes how effectively a machine can convert input work into output work. According to this concept, the efficiency of a machine is equal to the ratio of the output work to the input work. An ideal machine, meaning a machine that has no energy losses, has an efficiency of one. This implies that the input work and the output work are equal.
However, in reality, no machine can be truly ideal, and all of them experience some...
However, in reality, no machine can be truly ideal, and all of them experience some...
1.4K
Reducing Line Loss
429
In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
429
Lossy Lines and Overvoltages
379
Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
379
Design Example: Vintage Mixing Console
634
A sound engineer at a music company recently encountered a problem. The output from their newly acquired studio's vintage mixing console was too low for the requirements of modern recording equipment. To rectify this situation, the engineer decided to design an audio pre-amplifier using an operational amplifier (op-amp) to boost the signal level.
The specifications for the pre-amplifier were clear. It needed to amplify the audio signal by a factor of 10, have an input impedance above 10...
The specifications for the pre-amplifier were clear. It needed to amplify the audio signal by a factor of 10, have an input impedance above 10...
634
Quantifying and Rejecting Outliers: The Grubbs Test
4.3K
Sometimes, a data set can have a recorded numerical observation that greatly deviates from the rest of the data. Assuming that the data is normally distributed, a statistical method called the Grubbs test can be used to determine whether the observation is truly an outlier. To perform a two-tailed Grubbs test, first, calculate the absolute difference between the outlier and the mean. Then, calculate the ratio between this difference and the standard deviation of the sample. This...
4.3K

