Engineering controls are a critical component of any effective noise management strategy in a manufacturing environment. They aim to reduce noise at its source or interrupt its path, rather than relying solely on personal protective equipment like hearing protection devices (HPDs). In a setting with multiple noise sources exceeding permissible limits, a combination of engineering controls is often necessary to achieve adequate noise reduction. Here are some key engineering controls with examples of their practical application:
1. Source Modification: This involves modifying the noisy equipment itself to reduce the sound it produces. One common approach is vibration damping. For example, if a metal stamping machine is causing excessive noise due to vibration, damping materials such as rubber or visco-elastic compounds can be applied to the machine panels or framework to reduce vibration. This lowers the sound energy radiated by the machine. Another technique is to use softer materials for parts of machinery that impact other parts. For instance, if metal gears are causing a high-pitched whine, replacing them with gears made from a more noise-damping composite material can greatly reduce the noise at the source. Another source control method can be to use equipment specifically designed to be quieter, such as replacing noisy older pneumatic tools with newer electric ones, or more modern pneumatic tools designed to be quieter. Also, optimizing operating parameters such as speed and pressure of machinery can help to reduce the noise generated by the equipment.
2. Enclosures: Enclosing noisy machinery within sound-insulating structures is a common method to contai....
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