NISCAIR Online Periodicals Repository Collection: IJEMS Vol.11(2) [April 2004]
http://nopr.niscair.res.in/handle/123456789/8817
The Collection's search engineSearch the Channelsearch
http://nopr.niscair.res.in/simple-search
A simple method to evaluate the critical loads of cantilever columns with follower forces
http://nopr.niscair.res.in/handle/123456789/9273
Title: A simple method to evaluate the critical loads of cantilever columns with follower forces
<br/>
<br/>Authors: Raju, K Kanaka; Rao, G Venkateswara
<br/>
<br/>Abstract: A simple method, based on two term
Galerkin method, is presented here to evaluate the critical loads of a uniform
cantilever column with follower forces. Three types of follower forces are
considered. If two terms are used in the Galerkin method, a quadratic equation
for the frequency is obtained and the critical loads are evaluated by making
the radical of the solution of the quadratic equation zero, avoiding a
frequency mapping with the applied follower force. When the radical is zero,
the value of the frequency obtained is the coalescence frequency. The accuracy
of results obtained from the present method is quite suitable for engineering
purposes. The accuracy can further be improved if suitable admissible
functions, which represent the first two modes of vibration accurately, are
chosen.
<br/>
<br/>Page(s): 143-146Experimental investigation on the supersonic jet impingement
http://nopr.niscair.res.in/handle/123456789/9272
Title: Experimental investigation on the supersonic jet impingement
<br/>
<br/>Authors: Ghanegaonkar, P M; Ramanujachari, V; Vijaykant, S
<br/>
<br/>Abstract: In order to
understand the effects of supersonic jet impingement, static tests are
conducted in a small-scale rocket motor loaded with a typical nitramine
propellant to produce a nozzle exit Mach number of 3. This jet is made to
impinge on a plate aligned vertically to the nozzle axis. The distance between
the nozzle exit and the plate is varied from 2 to 6 times the nozzle exit
diameter. The pressure rise due to jet impingement on the plate has been
measured using pressure transducers located at ten different radial locations.
The pressure - time data are analyzed to get an insight into the flow field
upstream of the plate. The maximum pressure exerted on the plate is about
20-30% of the maximum pressure generated in the combustion chamber. Ten static
tests are carried out to obtain the effects of nozzle divergence angle, axial
distance between the nozzle exit and the plate and the chamber stagnation
pressure on the flow field.
<br/>
<br/>Page(s): 100-106Thermoluminescence response of some common brands of iodised salt
http://nopr.niscair.res.in/handle/123456789/9271
Title: Thermoluminescence response of some common brands of iodised salt
<br/>
<br/>Authors: Gartia, R K; Sharma, B Arunkumar; Ranita, Usham
<br/>
<br/>Abstract: Thermoluminescence (TL) response
of ten Indian brands of iodized salt has been recorded for possible use in TL dosimetry.
It has been observed that a heat treatment of one minute at 500°C reduces the
complexity of the glow curve pattern. Further, in many cases heat treated samples
exhibit intense peaks at higher temperature which are stable at room
temperature (25°C) whereas some brands like Sungold, Tata, Ankur and Dandi
inhibit such peaks. TL response of two such cases namely the integration zone
200-400°C of the glow curve of Taja and Shudh brands of iodized salt follow
polynomial of degree three to beta exposure in the dose range 1 to <u>~</u> 25
Gy; indicating its potentiality in TL dosimetry.
<br/>
<br/>Page(s): 137-142Loss factor for a clamped edge circular plate subjected to an eccentric loading
http://nopr.niscair.res.in/handle/123456789/9270
Title: Loss factor for a clamped edge circular plate subjected to an eccentric loading
<br/>
<br/>Authors: Gupta, M K; Nigam, S P
<br/>
<br/>Abstract: Present article deals with the
analytical evaluation of modal loss factor of a clamped edge thin circular
plate of uniform thickness subjected to an eccentric harmonic point load.
Starting with the fundamental equation of forced transverse vibration of a thin
elastic plate in terms of Green’s function; the expression for the deflections
is determined. Stresses are calculated with the help of general
stress-deflection equations and the modal loss factor is evaluated at resonance
condition. The nodal circles’ radii are also determined analytically for each
mode shape.
<br/>
<br/>Page(s): 79-84