Multi-chamber Silencer Composed of Screw-perforated Tubes and Straight-perforated Tubes

Structural Analysis of the Exhaust Gas Silencer for the Flow through Perforated and Non-perforated Silencer

To minimize unwanted noise, the exhaust gas of high pressure and high temperature coming out of internal combustion engine passes through silencer. Various types of silencers like absorptive, reactive and resonating, perforated type are widely implemented in actual practice .perforated reactive mufflers have an effective damping capability. This paper deals with comparative structural analysis ...

Wave Energy Dissipation Using Perforated and Non Perforated Piles

The indispensable vital structure in any harbor is a breakwater in order to make available calm water region inshore. Pile breakwater can be employed as a small coastal protection structure where tranquility required is low. This study is concerned with CFD study on the performance of perforated hollow pile to dissipate wave energy and the novelty of this investigation is the role of perforatio...

Multi-objective Optimization of a Multi-chamber Perforated Muffler Using an Approximate Model and Genetic Algorithm

Perforated mufflers are widely used in automotive intake and exhaust systems and need to be properly designed. However, multi-objective optimization in practical perforated muffler designs usually involves finite element or boundary element models, which demand a higher computation time for evolutionary algorithms. In this paper, an approximate model for transmission loss (TL) predictions is es...

Experimental Studies of Wave Transmission through Single Perforated Sheets and Upright Perforated Wave Filters

Perforated appendicitis vs non-perforated appendicitis.

Of 156 patients with acute appendicitis, seen during 24 months, 21 had perforated. Age over 30 years especially in males, duration of symptoms over 48 hours, pulse rate on admission exceeding 100/ minute, generalised abdominal tenderness, leucocyte count in excess of 10,000 mm3 and a neutrophilia in excess of 70 percent, characterized patients with appendicular perforation. The rate of complica...