The paper presents design solutions for reduction of gasdynamic noise from the passenger car exhaust system end pipe mouth. Data on overall levels and waterfalls of noise pressure obtained by experiment are provided. The best exhaust system design has been defined based on the results of the general levels analysis.
The article considers the technique and results of computational studies of the acoustic characteristics of the elements and the motor vehicle intake system. It describes the purpose and operation characteristics of the intake system. It is noted that the waves occurring in the intake tract, the nature of which depends on the geometry of the intake tract and the operating mode of the engine, determine the acoustic characteristics of the intake system and can improve or worsen the filling of the cylinders. Adding Helmholtz resonators to the manifolds improves the acoustic characteristics of the intake system depending on the engine speed and maximizes filling of cylinders for different speed modes. This allows to increase the power, economic, environmental performance of the engine and reduce the gas-dynamic noise emitted by the cutoff of the intake tract. A resonator was developed on the basis of finite element modeling to replace the connecting pipe of the air supply hose of hot air for improving the acoustic characteristics of motor vehicle intake system. The range of transmission loss (TL) of intake system has been calculated to evaluate the performance of the elements and the intake system in acoustical performance. The overall level of sound pressure at idling speed is determined by radiation in the frequency range 100-5000 Hz. In this range, in most one-third octave, the resonator lowers the sound pressure up to 5 dBA.
В. В. Галевко кандидат технических наук, доцент, доцент кафедры «Детали машин и ТММ»;Московский автомобильно-дорожный институт; galewkow@mail.ru Р. И. Рахматов аспирант кафедры «Детали машин и ТММ»; Московский автомобильно-дорожный институт; rahmatov_ri@mail.ru Описана расчётно-экспериментальная методика проектирования конструкций системы обработки отработавших газов (СООГ) грузового автомобиля на основе конечно-элементного моделирования и результаты расчётно-экспериментальных исследований. Приведены результаты исследований, в том числе в виде распределения звукового давления по внутреннему объёму, разработанных конструкций СООГ. Выбрана конструкция глушителя-нейтрализатора с наилучшими виброакустическими характеристиками, которая изготовлена и испытана на грузовом автомобиле. Приведены результаты расчётно-экспериментальных исследований глушителя-нейтрализатора.
Система обработки отработавших газов; каталитический блок; конечно-элементное моделирование; глушитель-нейтрализатор.Цитирование: Галевко В.В., Рахматов Р.И. Расчётное и экспериментальное исследование систем обработки отра-ботавших газов // Вестник Самарского университета. Аэрокосмическая техника, технологии и машиностроение.
This paper presents a calculation method for researching acoustic characteristics of the exhaust system main elements in modern motor vehicles. The acoustic characteristics of the absorbing materials used in the muffler have been defined by method of calculation and experiment.
This article describes an experimental method of designing mufflers based of finite element modelling and the results of
experimental study. We have presented the results of studies, including in the form of sound pressure distribution over the internal
volume and transmission losses of the developed designs of the muffler. Based on the results of these studies, a design with the best vibroacoustic
features was selected. The results of experimental testing of the developed and manufactured design of a catalytic silencer
in a car are presented.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.