Effects of Direction and Rate of Ear-Canal Pressure Changes on Tympanometric Measures

1986 ◽  
Vol 29 (1) ◽  
pp. 11-19 ◽  
Author(s):  
Janet E. Shanks ◽  
Richard H. Wilson
Keyword(s):  
Phase Angle ◽  
Peak Pressure ◽  
Pressure Change ◽  
General Purpose ◽  
Ear Canal ◽  
Angle Data ◽  
General Purpose Computer ◽  
The Difference ◽  
Pressure Changes ◽  
Purpose Computer

The effects of the direction (ascending and descending) and rate (12.5, 25.0, and 50.0 daPa/s) of ear-canal pressure changes on three tympanometric measures (peak static admittance, shape, and typanometric peak pressure) were studied in 24 adults with normal middle-ear transmission systems. Susceptance, conductance, admittance, and phase angle data for the six conditions both at 226 and 678 Hz were obtained using a general purpose computer. Peak static admittance was significantly affected by both the rate and direction of pressure change as evidenced by a decrease in phase angle for ascending and for fast rates of ear-canal pressure change. Tympanometric shape was broader for descending pressure changes with less frequent notching both for descending and for slow rates of pressure change. Finally, the difference in peak pressure for the two directions of pressure change increased with the rate of ear-canal pressure change.

An Efficient Method for Calculating Damped Critical Speeds of Rotor-Bearing Systems

1991 ◽  
Author(s):  
D. Z. Wang ◽  
D. L. Taylor
Keyword(s):  
Element Model ◽  
General Purpose ◽  
Critical Speeds ◽  
Rotor Bearing ◽  
General Purpose Computer ◽  
System Equations ◽  
Newton Raphson ◽  
Reported Data ◽  
Derivatives Of ◽  
Purpose Computer

Abstract This paper describes an analytical approach for calculating the damped critical speeds of multi-degree-of-freedom rotor-bearing systems. It is shown that to calculate the critical speeds is equivalent to finding the roots of a proposed matrix algebraic equation. The technique employes a Newton-Raphson scheme and the derivatives of eigenvalues. The system left eigenvectors are used to simplify the calculations. Based on this approach, a general-purpose computer program was developed with a finite element model of rotor-bearing systems. The program automatically generates system equations and finds the critical speeds. The program is applied to analyze a turbomachine supported by two cylindrical oil-film Journal bearings. The results are compared with reported data and the agreements are very good.

scholarly journals The Two Dimensional Representation of Three Dimensional Interferometer Measurements

1979 ◽  
Vol 49 ◽  
pp. 19-26
Author(s):  
R.H. Frater
Keyword(s):  
Three Dimensional ◽  
General Purpose ◽  
Two Dimensions ◽  
Two Dimensional ◽  
Dimensional Representation ◽  
General Purpose Computer ◽  
Efficient Processing ◽  
Purpose Computer

SummaryA convolution technique for the reduction of three dimensional interferometer measurements to two dimensions is described. With the addition of relatively simple hardware to a general purpose computer the technique allows fast, efficient processing of three dimensional data.

COMPUTER AND PROGRAMS FOR THE AP-C ANALYTICAL STEREOPLOTTER

1963 ◽  
Vol 17 (2) ◽  
pp. 155-168 ◽  
Author(s):  
E. C. Johnson ◽  
V. C. Kamm
Keyword(s):  
High Speed ◽  
General Purpose ◽  
Medium Size ◽  
Control Computer ◽  
General Purpose Computer ◽  
Complete Set ◽  
Purpose Computer

Tbe AP/C control computer is a specially designed, high speed, serial, binary, general-purpose machine with approximately 2000 words of memory. Although the machine is basically a general-purpose computer, in includes special facilities for communicating with the operator of the AP/C Stereoplotter for inputs from the operator’s handwheels and footwheel, and for outputs to servomechanisms on the AP/C viewing unit and coordinatograph. A complete set of programs for inner, relative and absolute orientations and for plotting operations is provided. In addition, the computer may be used for general-purpose computing when not required for plotting. In speed and versatility it is superior to most medium-size commercial computers.

A general purpose computer emulator

1978 ◽  
Vol 4 (3) ◽  
pp. 133-140
Author(s):  
Emilio Luque Fadon ◽  
Lorenzo Moreno Ruiz ◽  
JoséF Tirado Fernandez
Keyword(s):  
General Purpose ◽  
General Purpose Computer ◽  
Purpose Computer
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