Abstract
Transmission loss is the main method which measure silencer sound deadening capacity. The most effective noise elimination technique of compensator is muffler. Muffler is equipment which organizes sound transmission and permits airflow pass and must satisfy definite muffling amount and frequency property. The study builds model and theoretically studies and analyzes the internal sound problem and contrasts between FEM and transmission matrix method and computes transmission loss. On the basis of experimental verification, combining model analysis with sound pressure distribution graph, analyze muffling property deeply.
Highlights
INTRODUCTIONNoise especially strong impulse noise, serious harm to the human body, the most harm auditory is organ damage and hearing loss, as well as adverse effects on the nervous, digestive and circulatory systems
Noise especially strong impulse noise, serious harm to the human body, the most harm auditory is organ damage and hearing loss, as well as adverse effects on the nervous, digestive and circulatory systems.The installation of the muffler muzzle is effective muffler technology of muzzle noise
Muffler transmission loss is the nature of the muffler itself, only is the relevant with the structure of the muffler and has nothing to do with the velocity of sound in the outside of the muffler, so transmission loss of the evaluation parameters is used for theoretical studies, it’s difficult to measure in practice
Summary
Noise especially strong impulse noise, serious harm to the human body, the most harm auditory is organ damage and hearing loss, as well as adverse effects on the nervous, digestive and circulatory systems. Denia further applied FEM to the case of the uniform fluid flow field, in addition to these, researchers study on the muffler from a different perspective (Denia and Selamet, 2007). In 2003 Bilawchuk published an article using equivalent circuit of the transfer matrix method for the calculation of the acoustic characteristics of the muffler, in the same period (Bilawchuk and Fyfe, 2003), Ahmet studied acoustic transfer matrix in the presence of mean flow. With further study of the airflow and temperature, more comprehensive discussion of the use of the method to calculate the design muffler are proposed. This study will examine the acoustic characteristics of the muffler under the factors combined effects of flow rate, temperature and thermal viscous effects, to calculate the transmission loss
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