On the polar moment of inertia of a compressible body

1980 ◽  
Vol 22 (1) ◽  
pp. 57-60 ◽  
Author(s):  
J. Derral Mulholland
Keyword(s):  
Moment Of Inertia ◽  
Compressible Body ◽  
Polar Moment

Temporal variations of the polar moment of inertia and the second-degree geopotential

2004 ◽  
Vol 78 (3) ◽  
pp. 187-191 ◽  
Author(s):  
P. Varga ◽  
J. Engels ◽  
E.W. Grafarend
Keyword(s):  
Temporal Variations ◽  
Moment Of Inertia ◽  
Polar Moment ◽  
Second Degree

scholarly journals Rule-based equation for elastic tripping analysis of angle bar stiffeners

2012 ◽  
Vol 9 (2) ◽  
pp. 103-111 ◽  
Author(s):  
Ahmad Rahbar Ranji
Keyword(s):  
Energy Method ◽  
Flexural Rigidity ◽  
Torsional Rigidity ◽  
Beam Theory ◽  
Moment Of Inertia ◽  
Rule Base ◽  
Rule Based ◽  
Buckling Modes ◽  
Polar Moment ◽  
Marine Engineering

Tripping is one of buckling modes in stiffened plates which could be occurred in the stiffeners with high flexural rigidity and low torsional rigidity. Rule-base expressions for calculation of sectorial moment of inertia of angle-bar stiffeners are scattered. An expression for calculation of sectorial moment of inertia of angle-bar stiffeners is derived based on energy method and beam theory. Sectorial moment of inertia of different angle-bar stiffeners are calculated and compared with the values calculated by different classification society rules. It is found that some of the rule-based equations for calculation of sectorial moment of inertia of angle-bar stiffeners are inaccurate. Euler tripping stress of different angle bars are calculated by energy method and compared with rule-based equation and finite element method. It is found that, rule-based expression for calculation of polar moment of inertia of angle-bar stiffeners neglects one term, which could lead up to 10% overestimation of Euler tripping stress. DOI: http://dx.doi.org/10.3329/jname.v9i2.10443 Journal of Naval Architecture and Marine Engineering 9(2012) 105-111

Development of a Small Mixed-Flow Turbine for Automotive Turbochargers

1995 ◽  
Author(s):  
Hiroaki Minegishi ◽  
Hiromi Matsushita ◽  
Masaru Sakakida ◽  
Takaaki Koike
Keyword(s):  
Small Diameter ◽  
Turbine Rotor ◽  
Moment Of Inertia ◽  
Light Weight ◽  
Passenger Cars ◽  
Mixed Flow ◽  
Inertia Moment ◽  
Passenger Car ◽  
Radial Turbine ◽  
Polar Moment

In recent years, turbocharging technologies for passenger cars have progressed significantly. However, “Turbo Lag” is still one of the most important problems in turbocharging technologies. In order to improve response to acceleration, it is effective to reduce the polar moment of inertia of rotating parts. The turbine rotor designed with small diameter, light weight and high specific-speed contributes toward reducing inertia moment of the rotating parts. The further request for the smaller moment of inertia for passenger car applications made it difficult to satisfy the request with a conventional radial turbine rotor. This is why we developed a mixed-flow turbine rotor. This paper explains the computer analysis we carried out and experimental test data of the mixed-flow turbine for passenger car applications.

scholarly journals Partial Compensation of Unbalance by Oneand Two-Plane Automatic Balancing Devices

2004 ◽  
Vol 10 (3) ◽  
pp. 193-201 ◽  
Author(s):  
Boris Ryzhik ◽  
Henner Duckstein ◽  
Lutz Sperling
Keyword(s):  
Computer Simulations ◽  
Critical Speed ◽  
Optical Disk ◽  
Moment Of Inertia ◽  
Disk Drives ◽  
Practical Applications ◽  
Polar Moment ◽  
Automatic Balancing ◽  
Rigid Rotors ◽  
Partial Compensation

This article presents an analysis of several aspects of one- and two-plane automatic balancing devices of rigid rotors. The effect of partial compensation of unbalance and the decreasing of vibrations in the region beyond the first critical speed is studied analytically and confirmed by the results of computer simulations. The possibility of partial unbalance compensation is very important considering application of autobalancing devices to rotors with a large polar moment of inertia.Among the most important practical applications of devices are centrifuges, hand power tools, washing machines, and optical disk drives.

The Effect of the Damping of the Throws on the Torsional Vibration of the Crankshaft System of an Internal Combustion Engine

1929 ◽  
Vol 33 (227) ◽  
pp. 1086-1087
Author(s):  
J. Morris
Keyword(s):  
Internal Combustion Engine ◽  
Torsional Vibration ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Moment Of Inertia ◽  
Torsional Stiffness ◽  
Direct Drive ◽  
Polar Moment ◽  
R Ratio ◽  
Image Position

In the Journal for October, 1923, I gave the following formulæ for the frequencies in torsional vibration of the crankshaft system (see Fig. 1) of a direct drive engine having equal throws and equal journals, viz.:—1and2where3c=torsional stiffness (the CI/L) of an “equivalent journal”;p=polar moment of inertia of the “equivalent pulley” of a throw;r=ratio of the torsional stiffness of the shaft between the airscrew and the first “ equivalent pulley,” to that of an “ equivalent journal “;n=number of throws.

scholarly journals Effects of the Racket Polar Moment of Inertia on Dominant Upper Limb Joint Moments during Tennis Serve

PLoS ONE ◽  
2014 ◽  
Vol 9 (8) ◽  
pp. e104785 ◽  
Author(s):  
Isabelle Rogowski ◽  
Thomas Creveaux ◽  
Laurence Chèze ◽  
Pierre Macé ◽  
Raphaël Dumas
Keyword(s):  
Upper Limb ◽  
Moment Of Inertia ◽  
Joint Moments ◽  
Polar Moment ◽  
Tennis Serve
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