Industrial noise and vibration control pdf
Sound and Vibration Control Solutions- DEICONThe Noise and Vibration unit is responsible for developing policy and providing guidance for highway transportation related noise and vibration issues. Much of our work focuses on analyzing and mitigating noise impacts of federally funded construction projects. We also provide support for evaluating operational and construction related noise and vibration concerns. Topic areas we assist with are: noise barriers, quiet pavement, bridge noise, rumble strips, hydroacoustics, and bioacoustics. We work with other Caltrans offices, divisions, and outside agencies to develop innovative design approaches to lower noise levels generated by transportation noise infrastructure. We can provide support in evaluating new products or processes that may lower noise impacts.
Vertical Bows: Noise and Vibration Control
The aims of the study were to describe the noise levels at an open cast chromite mine in Odisha, India, and the hearing threshold of its workers and to associate their hearing loss with their age, work station and length of employment at the mine. We performed a cross-sectional study of the hearing threshold of chromite mine workers. The latest audiometry data available for the period to was used in the analysis.
Noise and Vibration Control Engineering: Principles and Applications
Noise control and vibration control treatments are not one-size-fit-all solutions. Different control mechanisms and strategies should be used to solve different problems. DEICON has the experience and the know-how to provide the most suitable solutions to variety of industrial, architectural and marine noise and vibration problems. The traditional passive damping methods include the use of broadband dissipative solutions such as sound absorbing material for sound , viscoelastic, viscous, and friction dampers for vibration , as well as narrowband reactive solutions tuned dampers such as Helmholtz resonators for sound and tuned mass dampers for vibration. Active damping involves the use of actuators e.
Cork plays a significant role in the elastomer and is directly responsible for the damping function, commonly designated as the energy loss factor, while the rubber matrix takes care of the isolation, together they are the ideal combination when considering vibration and noise reduction solutions especially at resonance frequencies. The elastomeric blend is distinctive to rubbers which are incompressible, needing space to displace the compressed volume, cork rubber displaces much less volume due to corks compression within itself allowing for a wider tolerance in part shape and dimensions commonly designated as the shape factor, which in turn affects the design robustness. Amorim VC vibration control material is especially used in power transformers and reactors as vibration pads beneath the active part immersed in oil, as well as decoupling supports between the core structure and the tank wall or tank cover on the core clamping mechanism. VC appropriately applied is able to reduce up to 6dB in overall transformer noise. A number of different options are available to the power industry for external vibration pad materials. This information is not intended to be used as a purchasing specification and does not imply suitability for use in a specific application.