Free Vibration Analysis of a Rectangular Duct with Different Axial Boundary Conditions

3This paper describes the free vibration analysis of a rectangular duct by using the Rayleigh-Ritz method. Static beam functions are used as admissible functions in the Rayleigh-Ritz method. These basis functions are the static solutions of a point-supported beam under a series of sinusoidal loads. The unique advantage of using this method is that it allows for the consideration of different axial boundary conditions of a duct. Computational results are validated with existing literature data for a simply supported rectangular duct and the finite element method (FEM) for other axial boundary conditions. A validated analytical model is used for generating natural frequency data for different dimensions of rectangular ducts. Further curve fitting has been done for the generated data, and an empirical relation has been presented to calculate the first fundamental natural frequency for different material properties of ducts and different axial boundary conditions, which can be used for any dimensions of the duct within the specified range

Utilization of head and vertebrae of Otolithoides biauritus - a new economic resource

Otolithoides biauritus, locally called as koth is an important resource in Maharashtra. Exploited by multi-day trawlers, the resource is abundant throughout the year with peak landings during the period of October-December, at New Ferry Wharf landing centre. These trawlers are operated at a depth of 40-60 m, 80-90 km off north-west coast. The total length of the fish in trawl landings usually ranges between 90-150 cm

Utilization of skin of 'Koth', Otolithoides biauritus - a new fish by-product

Dasyatis uarnak (banded whip-tail stingray)skin is being used as another alternative sources for leather.The skin of Koth and Ghol is used for this purpose and the finished product is used in the manufacture of purses,belts etc

Unusual landings of ghol, Protonibea dicanthus in dol net at Bassien Kolliwada(Vasai) landing centre.

Bassein Kolliwada is an important landing center in Maharashtra, where traditional dol net fishing is carried out for Bombay duck and silver pomfret which are economically the most important resources in the region. But, landings of Bombay duck and silver pomfrets have declined considerably during past few years. A dol net boat named ‘Dayadhan‘landed huge catch of ghol fish,Protonibea dicanthus at Bassein Kolliwada,from a depth of about 40 meters off Jaffrabad in Saurashtra region of Gujarat.It is perhaps the scarcity of fish that has led them to search for the new grounds for ghol,ribbonfish,koth(O.biauritus),and warm (C.talabanoides) in Gujarat waters

Case of tumour in Otolithies cuvieri landed at New Ferry Wharf, Mumbai

Otolithies cuvieri landed at New Ferry Wharf was affected with Tumou

बासीन कोल्लिवाडा (वसाइ) अवतरण केंद्र, ताने जिला, महाराष्ट्र में कारली डोल जाल द्वारा रजत पाँम्फ्रेट पाम्पस आर्जंन्टस का असाधारण अवतरण

कृपया पूरा लेखा पढ

Landing of giant rock cod Promicrops lanceolatus (Bloch 1970) at New Ferry Wharf, Mumbai

The giant rock cod, Promicrops lanceolatus (Epinephalus lanceolatus) is found off the entire coastline of the Western Indian Ocean, in the waters of Indonesia, the Phililppines, Taiwan and Australia (Fischer and Bianchi, 1984)

Seasonal abundance of ‘Ghol’, Protonibea diacanthus (Lacepede, 1802) at Bassien koliwada, Maharashtra

Protonibea diacanthus, locally known as ‘Ghol’ is one of the commercially important fishes of northwest coast of India. The swim bladder of Ghol, after sun drying, is processed into clarifying agent for the beverage industry. The bladder of this species fetches a very high market price owing to its excellent quality