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Questions and Answers
What is the minimum height of a barrier required to effectively block 2354 Hz sound waves in an open space, given a wavelength of 11 ft?
What is the primary function of a sound barrier near a sound source?
At which frequency does a sound barrier become less effective with increasing distance between the barrier and the sound source?
What is the purpose of placing workers in sound-treated control rooms or offices?
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What is the least acceptable method of noise control?
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What is the wavelength of a 100 Hz sound wave, if a barrier 5 times the wavelength is required to create a sound shadow?
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What is the purpose of the described curtains?
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What material is used in the described Low Frequency Sound Absorber?
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In what range of thicknesses are the curtains available?
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What is the primary function of the Anechoic Wedges pattern described for the Low Frequency Sound Absorber?
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What is the purpose of enclosing a sound source?
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What type of structure are the described Acoustical Enclosures made of?
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How does sound absorption work in an enclosure?
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What additional feature is not mentioned as part of the Complete Systems for the Acoustical Enclosures?
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What is a common problem associated with simply placing a solid enclosure over a sound source?
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Why are some sound sources challenging to enclose?
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What should the sides of an enclosure contain to be effective in reducing noise?
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What are some effective methods for isolating noise in the workplace?
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Study Notes
Sound Absorption and Noise Control
- Soundwave melamine foam sound absorber is a class A fire retardant high-performance sound absorber.
- A barrier in the near field can be effective in reducing sound levels, but its effectiveness decreases as the distance between the barrier and the sound source increases.
- For a 100 Hz frequency, a barrier must be approximately 5λ high to create a sound shadow.
Barrier Types
- Lead curtains, drapes, or solid shields can be used as barriers to redirect sound energy away from receivers or absorb sound.
- Quilted curtains can be used as noise barriers.
- Outdoor wall barriers can be effective in reducing sound levels.
Noise Control Methods
- Placing a barrier in the near field can reduce sound levels.
- Enclosing the receiver, such as placing workers in sound-treated control rooms, can also reduce noise exposure.
- Removing the receiver from the noise or using hearing protectors as a last resort can also be effective.
- Removing the noise source or reducing the noise level at the source is the most effective method.
Acoustic Materials
- Open-cell melamine acoustic foam is a durable, high-performance sound absorber.
- Convoluted double hump anechoic wedges and SonexT patterns are available for sound absorption.
- The material is available in various thicknesses, sizes, and colors, and is suitable for industrial, commercial, and residential applications.
Enclosures and Treatment
- Enclosing the sound source can be an effective method of noise control.
- Isolation of the noise source can be achieved by moving machinery to remote areas, enclosing machines with sound-absorbing material, or fitting flexible screens or curtains around the machinery.
- Enclosing the sound source must include sound-absorbing material on all sides, as a solid enclosure can be ineffective.
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Description
Test your knowledge about sound absorption, barrier placement, and the effectiveness of barriers based on distance. Questions cover topics like sound wave patterns, fiber-free materials, and the impact of barrier height on sound containment.
