Dynamic Analysis of Flexible Gear Coupling Efforts in Rotating Machinery

2002 ◽  
Author(s):  
Alan Sbravati ◽  
Katia Luchesi Cavalca
Keyword(s):  
Dynamic Analysis ◽  
Rotating Machinery ◽  
Flexible Gear

An Evaluation of Mode Tracking Methods for Practical Rotor Dynamic Analysis

2020 ◽  
Author(s):  
Anurag Rajagopal ◽  
Dilip K. Mandal
Keyword(s):  
Dynamic Analysis ◽  
Rotating Machinery ◽  
Mode Shapes ◽  
Test Cases ◽  
Dynamic Simulations ◽  
Campbell Diagram ◽  
Practical Applications ◽  
Rotor Dynamic ◽  
Mode Tracking ◽  
Theoretical Foundations

Abstract An important precursor to the dynamic analysis of rotating machinery, in either frequency or time domain, is the extraction of its mode shapes and corresponding frequencies. This is often presented as a Campbell diagram, which plots the frequency of each mode as a function of the rotor speed. A typical Campbell diagram has several backward whirl, linear and forward whirl modes leading to numerous intersections. Therefore augmenting the eigenvalue solution with a mode tracking algorithm to output the Campbell diagram is of essential interest to a practicing engineer. This paper presents an evaluation of several mode tracking approaches for rotor dynamic simulations, starting from their theoretical foundations to practical applications using several test cases. These tracking algorithms are implemented in the structural solver, OptiStruct, part of Altair Engineering’s CAE framework. Finally, the conclusions drawn from this exercise offer engineers studying rotating machinery several key insights.

Dynamic Analysis of Horizontal Rotating Machinery

1999 ◽  
Author(s):  
Katia Lucchesi Cavalca ◽  
Heron Quinsan Lins
Keyword(s):  
Dynamic Analysis ◽  
Rotating Machinery

Structural Design and Dynamic Analysis of Carbon Fiber Reinforced Plastic Shaft with Metal Parts

2020 ◽  
Vol 861 ◽  
pp. 193-201
Author(s):  
Wei Bo Yang ◽  
Hua Chun Wu ◽  
Jian Zhou ◽  
Jin Guang Zhang
Keyword(s):  
Dynamic Analysis ◽  
Natural Frequency ◽  
Dynamic Characteristics ◽  
Structural Design ◽  
Fiber Orientation ◽  
Orientation Angle ◽  
Fem Analysis ◽  
Rotating Machinery ◽  
Stacking Sequence ◽  
Fiber Orientation Angle

It is important to improve dynamic performance of rotating machinery by reducing the mass of shaft and increasing the natural frequency. Many studies have focused on dynamic characteristics of shaft in rotating machinery with the utilization of composite material. This paper mainly investigates the structural design and dynamic analysis of a CFRP/Metal hybrid shaft. The finite element method (FEM) has been used to determine the selection of design variables include fiber orientation angle, layers stacking sequence and layers thickness. Also, experimental test was carried out using a FFT analyzer with impact hammers. The differences between the FEM analysis result and the experiment test result were respectively less than 4.5% and 6.3% for the first two natural frequencies; therefore, the results of FEM analysis are acceptable. The results reveal that the fiber orientation angle is the most significant factor affecting the dynamic characteristics of CFRP/Metal hybrid shaft. In addition, there have some effect of the layer stacking sequence on natural frequency.

Alternative to traditional systems of vibration control of rotating machinery

2005 ◽  
Vol 219 (1) ◽  
pp. 27-42
Author(s):  
R. D. Ambrosini ◽  
R. O. Curadelli ◽  
R. F. Danesi
Keyword(s):  
Dynamic Analysis ◽  
Vibration Control ◽  
Control Systems ◽  
Numerical Study ◽  
Rotating Machinery ◽  
Acceleration Response ◽  
Support Structure ◽  
Vibration Absorption ◽  
Alternative Systems

The main objective of this paper is the comparison between the efficiency of vibration control systems of rotating machinery, in order to present alternatives for the cases in which it is not possible or convenient to use traditional systems. Moreover, the formulation of the theoretical dynamic load that should be used in the dynamic analysis is discussed. An experimental and numerical study is presented considering as an alternative system of vibration absorption the incorporation of masses on the support structure. Masses of 5, 10, and 15 per cent of the total mass of the vibrating machinery are included in the analysis. A set of tests about a case study on the spring (traditional) and built-in masses (alternative) systems is presented. Moreover, a linear dynamic analysis of the models with a finite element code was carried out. The behaviour of the built-in masses system is very good, reducing the acceleration response on the support structure to levels comparable to traditional systems.

Dynamic Analysis Method for Electromagnetic Artificial Muscle Actuator under PID Control

2011 ◽  
Vol 131 (2) ◽  
pp. 166-170 ◽  
Author(s):  
Yoshihiro Nakata ◽  
Hiroshi Ishiguro ◽  
Katsuhiro Hirata
Keyword(s):  
Dynamic Analysis ◽  
Pid Control ◽  
Artificial Muscle ◽  
Analysis Method
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