11 - 20 of 20 Chapters
[With the rapid growth of rotating machinery from the beginning of the 20th century, there was a need to determine the natural frequencies in an industrial environment by rapid means that can be established to handle various design problems. Methods were devised to streamline and develop...
[The kinetic and potential energies in a free vibration problem are expressible as homogeneous quadratic forms in the velocities q̇i and coordinates qi respectively, leads to important conclusions to be drawn concerning normal coordinates.]
[Once the possibility of computers was foreseen, the engineering community turned its attention to solving complex elasticity and structural analysis problems rather than depending on an approximate strength of materials approach. It also allowed the engineering community to depend less on...
[The industrial revolution began with reciprocating steam engines as devised by James Watt in 1780, and the 19th century witnessed a rapid expansion in various industrial sectors. Unfortunately, the reciprocating steam engine had several problems because of external combustion and excessive...
[Linke  measured the main current and exciting current after a short circuit. The main current rose to about 32 times the normal current. Brown Boverie Co.  reported that for a 3000 RPM 8800 kva machine, the maximum short circuit current is about 10-20 times that at full load. The current...
[The finite element method for rotors was first developed by Ruhl and Booker . Nelson and McVaugh  extended this to include gyroscopic effects. The effects of axial torque were included by Zorzi and Nelson  and Nelson  gave rotor dynamics elements with the Timoshenko beam theory....
[Bladed-disk vibrations were well studied because of the critical fatigue problems. They are the most stressed systems in machines. Campbell , Stodola  and Sezawa  are amongst the first few who studied the bladed-disks. Kroon  applied difference calculus to the case of lashed...
[Turbine bladed disks continue to fail because of fatigue caused by resonant stresses; one of the major failures in the 1990s was reported in a nuclear machine in Narora, India. Bearing failures caused machine trip and rubbing caused blade fatigue (see Figure 18.1).]
[Optimization had its roots in the scientific revolution period and thus is one of the oldest sciences . For industrial applications, however it remained dormant until recent times. The pioneering work of modern structural topology can be traced back to 1981 when Cheng and Olhoff, see...
[In just over three centuries, through a scientific revolution, mankind became scientists with an understanding of continuum phenomena, solids, fluids, thermodynamics and other manifestations of nature that existed around them.]
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