Complex modal testing of asymmetric rotors using magnetic exciter equipped with hall sensors

2001 ◽  
Vol 15 (7) ◽  
pp. 866-875
Author(s):  
Chong-Won Lee ◽  
Si-Kyoung Kim
Keyword(s):  
Modal Testing ◽  
Hall Sensors ◽  
Complex Modal

Unidirectional Excitation Technique for Complex Modal Testing of Asymmetric Rotor Systems: Application to DTG

1997 ◽  
Author(s):  
Seok-Ku Lee ◽  
Chong-Won Lee
Keyword(s):  
Coordinate System ◽  
Frequency Response ◽  
Modal Testing ◽  
Theoretical Development ◽  
Response Functions ◽  
Rotor Systems ◽  
Numerical Example ◽  
Stationary Coordinate System ◽  
Asymmetric Rotor ◽  
Complex Modal

Abstract Unidirectional excitation technique is presented for the complex modal testing of asymmetric rotor systems. The theoretical development, which is made strictly in the stationary coordinate system, enables the unidirectional excitation to effectively estimate the directional frequency response functions. It far lessens the testing efforts a numerical example of the dynamically tuned gyroscope (DTG) is treated to demonstrate the practicality of the complex modal testing.

scholarly journals A modified complex modal testing technique for a rotating tire with a flexible ring model

2015 ◽  
Vol 60-61 ◽  
pp. 604-618 ◽  
Author(s):  
Jongsuh Lee ◽  
Semyung Wang ◽  
Bert Pluymers ◽  
Wim Desmet ◽  
Peter Kindt
Keyword(s):  
Modal Testing ◽  
Testing Technique ◽  
Ring Model ◽  
Flexible Ring ◽  
Complex Modal

Complex Modal Testing Methods for Rotating Machinery

1991 ◽  
Author(s):  
Chong-Won Lee ◽  
Young-Don Joh
Keyword(s):  
Frequency Response ◽  
Rotating Machinery ◽  
Modal Testing ◽  
Response Functions ◽  
Testing Methods ◽  
Complex Signals ◽  
Indirect Assessment ◽  
Testing Method ◽  
Effective Use ◽  
Complex Modal

Abstract Various modal testing methods are proposed for the effective use of complex modal testing for rotating machinery, focusing on excitations and measurements. The proposed methods are developed, based on the input/output relationships for complex signals, for the direct or indirect assessment of frequency response and coherence functions between complex inputs and outputs. The proposed testing methods and the classical modal testing method are compared in consideration of required number of frequency response functions (FRFs) and testing efforts.

Hall Sensors and Their Application

2014 ◽  
Vol 134 (7) ◽  
pp. 186-192
Author(s):  
Ichiro Shibasaki
Keyword(s):  
Hall Sensors

Tire Vibration Modes and Effects on Vehicle Ride Quality

1993 ◽  
Vol 21 (1) ◽  
pp. 23-39 ◽  
Author(s):  
R. W. Scavuzzo ◽  
T. R. Richards ◽  
L. T. Charek
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Operating Conditions ◽  
Modal Testing ◽  
Ride Quality ◽  
Vibration Modes ◽  
Inflation Pressure ◽  
Passenger Cars ◽  
Element Modeling ◽  
Road Surfaces

Abstract Tire vibration modes are known to play a key role in vehicle ride, for applications ranging from passenger cars to earthmover equipment. Inputs to the tire such as discrete impacts (harshness), rough road surfaces, tire nonuniformities, and tread patterns can potentially excite tire vibration modes. Many parameters affect the frequency of tire vibration modes: tire size, tire construction, inflation pressure, and operating conditions such as speed, load, and temperature. This paper discusses the influence of these parameters on tire vibration modes and describes how these tire modes influence vehicle ride quality. Results from both finite element modeling and modal testing are discussed.

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