Sound transmission

This paper presents the applying of sound barrier wall for highways in Viet Nam studied from existing experiments in the world. Nowadays, pollution sources come from traffic noises, water sources and air environment. Especially, traffic noises such as transportations, trains and airplanes are much serious and effect population and country. On road traffic systems, noise generated by vehicles is always in high level and give discomfort to residents who live around both sides of highways.

7p vibecca 01-10-2024 0 0   Download

This research has raised the question of whether the vibration transmission at a wall junction depends on how the wall is excited (by either a sound wave or a mechanical shaker). The aim of this research is to investigate this question and hence contribute to the revision of the series of standards. Villot and Guigou-Carter (2000) have considered this problem but their equations (10) and (13) appear to be in error. This research will endeavour to derive the correct equations and r epeat Villot and Guigou Carter’s calculations.

162p runthenight05 01-03-2023 9 3   Download

The aim of this research was to develop a method for predicting the level of sound radiated from a finite flat panel or finite opening in any particular direction relative to the level of sound radiated in the direction normal to the finite flat panel or finite opening.

132p runthenight07 01-03-2023 4 2   Download

Research objectives: Understand and implement the experimental process to determine the sound transmission loss of through composite sandwich plates used in ships in Vietnam; Application of research results on the reduction of engine room composite shell ship was built at the Institute of Ship Research and Development, Nha Trang University

30p tunelove 11-06-2021 15 3   Download

Most flat-panel monitors use liquid crystal display (LCD) technology. Passive matrix LCD uses a transistor for each row and column of pixels: less expensive, narrow viewing angle, submarining (animated graphics blurry) Active matrix LCD uses a transistor for each pixel on the screen: expensive, wider viewing angle, faster refresh Thin-film transistor (TFT) displays use multiple transistors for each pixel.

26p trada85 18-01-2013 51 4   Download

Terminology and Abbreviations biles are even programmed to adjust engine operation for things like valve wear and combustion chamber deposit buildup as the engine ages. In automobiles the same computers are used to make smart cars by controlling the steering, brakes, exhaust system, suspension, seats, anti-theft systems, sound-entertainment systems, shifting, doors, repair analysis, navigation, noise suppression, environment, comfort, etc. On some systems engine speed is adjusted at the instant when the transmission shifts gears, resulting in a smoother shifting process.

20p hiruscar 25-10-2010 118 8   Download