Due to increase in the number of goods carrying tricycles, the amount of noise and pollution on our roads has increased. To optimize the control of the engine noise emission for tricycle, different absorptive material liners have been introduced into muffler design. In this study, the performance of Aerogel, Ceramic, Kenaf fibre, Polyester and Rockwool as absorptive material liners on the trans...

Engine noise, as a source of sound pollution for humans and the environment, can be reduced by designing high-performance muffler. This study presents novel, organized design process that muffler KTM390 engine case study. The acoustic simulation analysis is performed in COMSOL software aerodynamic ANSYS Fluent. features considered this are overall length muffler, presence baffles related parame...

The article considers the urgent issue of reducing toxicity harmful components car exhaust gases. In order to solve this problem, a direction was proposed improve system for cleaning gases internal combustion engines by introducing an ultrasonic emitter into muffler device. An experimental installation with made plan determining effectiveness based on method similarity theory and dimensional an...

The stealth capability of a submarine differentiates it from other maritime platforms. The power plant for many submarines exceeds 1 Mega-Watt and the technical challenge is to reduce its acoustic signature to unperceivable levels. Novel vibration reduction technologies have been developed and tested at the University of Adelaide as part of a DSTO Capability Technology Demonstrator program that...

Exhaust noise in engines has always been a major source of automotive noise. Challenges for muffler design have been constraints on size, back pressure, and, of course, the cost. Designing for sufficient insertion loss at the engine firing frequency and the first few harmonics has been the biggest challenge. Most advances in the design of efficient mufflers have resulted from linear plane wave ...

An alternative exhaust manifold system, the Perforated Manifold, Muffler, and Catalyst (PMMC), is proposed to improve sound suppression while reducing engine pumping losses and exhaust emissions. One-dimensional predictions from acoustic theory are used to configure the initial design. Preliminary evaluation of the concept is based on bench tests, including an extended impedance tube set-up for...

This paper considers the combined use of a hybrid numerical method for the modeling of acoustic mufflers and a genetic algorithm for multiobjective optimization. The hybrid numerical method provides accurate modeling of sound propagation in uniform waveguides with non-uniform obstructions. It is based on coupling a wave based modal solution in the uniform sections of the waveguide to a finite e...