Drilling Assembly Vibration Model Validated with Frequency Domain Examination of Distributed Downhole Measurements

2013 ◽  
Author(s):  
B. l Feauto ◽  
C. Jeffery ◽  
C. Hanley ◽  
R. G. Duff
Keyword(s):  
Frequency Domain ◽  
Vibration Model ◽  
Downhole Measurements

Vibration Simulation of Articulated Dump Truck with the Variation of Longitudinal Center of Gravity Position of Rear Sprung Mass and Rear Suspension Stiffness

2011 ◽  
Vol 383-390 ◽  
pp. 1812-1818
Author(s):  
Xue Yan Zhang ◽  
Wen Ming Zhang
Keyword(s):  
Frequency Domain ◽  
Center Of Gravity ◽  
Dump Truck ◽  
Stochastic Excitation ◽  
Rear Suspension ◽  
Object A ◽  
Vibration Model ◽  
Suspension Stiffness ◽  
Vibration Simulation ◽  
The Impact

The paper is concerned with the vibration for the articulated dump truck (ADT) which is multi-axle vehicle and different from rigid dump truck. The balanced suspension was employed as the rear suspension in the 60t ADT which the paper takes as the research object. A vibration model of 6 dof for the truck was proposed. The impact of the variation of longitudinal center of gravity position of rear sprung mass and rear suspension stiffness on vibration was investigated in stochastic excitation of the truck in the frequency domain. It is found that it is beneficial to the comfort of the truck when the center of gravity of the sprung mass moves forward and the impact of rear sprung stiffness on vibration is not too great. The results of the vibration for the truck are provided for the design of the 60t ADT.

scholarly journals Diagnostics of Turbine Blades, Based on Estimation of Frequency Response Function

2021 ◽  
Vol 51 (2) ◽  
pp. 63-78
Author(s):  
Jerzy Kotkowski ◽  
Edward Rokicki ◽  
Paweł Lindstedt ◽  
Jarosław Spychała ◽  
Jerzy Perczyński ◽  
...  
Keyword(s):  
Transfer Function ◽  
Frequency Response ◽  
Frequency Domain ◽  
Frequency Response Function ◽  
Turbine Blades ◽  
Amplitude Spectrum ◽  
Technical Condition ◽  
Phase Spectrum ◽  
Vibration Model ◽  
Parts Transfer

Abstract The aim of the study is to propose a diagnostics method based on blade’s vibration model in frequency domain. Amplitude spectrum A(ω) and phase spectrum φ(ω) have been experimentally identified which define transfer function G(jω) = P(ω) + jQ(ω) and their real P(ω) and imaginary Q(ω) parts. Transfer function G(jω) and resulting frequency, amplitude, phase characteristics and real P(ω) and imaginary Q(ω) parts are parts of blade’s diagnostics model. Changes in those characteristics are directly related to changes in the technical condition of the blades. It has been noticed that small changes in the technical condition cause large changes in frequency characteristics, which proves their usefulness in the diagnosis process.

Correction to "The analysis of slug tests in the frequency domain" (WRR 25(11), pp. 2388-2396

1990 ◽  
Vol 26 (8) ◽  
pp. 1863-1863
Author(s):  
Paul Marschall ◽  
Baldur Barczewski
Keyword(s):  
Frequency Domain ◽  
Slug Tests

Methods of calibration of high-resolution optical reflectometers operating in the frequency domain

2018 ◽  
pp. 40-43
Author(s):  
V.V. GRIGORIEV ◽  
◽  
V.E. KRAVTSOV ◽  
A.K. MITUEV ◽  
E.A. MOROZ ◽  
...  
Keyword(s):  
High Resolution ◽  
Frequency Domain
Sign in / Sign up

Export Citation Format

Share Document