Dynamic Analysis of Geared Shaft Systems By Using a Continuous System Model

1993 ◽  
Vol 166 (3) ◽  
pp. 539-556 ◽  
Author(s):  
Ö.S. Şener ◽  
H.N. Özgüven
Keyword(s):  
Dynamic Analysis ◽  
Continuous System ◽  
System Model

Critical Speeds of Geared Rotors by Including Mesh Stiffness and Using a Continuous System Model

1990 ◽  
Author(s):  
O. Sedat Sener ◽  
H. Nevzat Ozguven
Keyword(s):  
Dynamic Analysis ◽  
High Speed ◽  
Natural Frequencies ◽  
Continuous System ◽  
Transmission Error ◽  
System Model ◽  
Graphical Form ◽  
Critical Speeds ◽  
Gear Mesh ◽  
Dynamic Factors

Abstract Dynamic analysis of high speed gearing for the computation of critical speeds and dynamic factors is a must in a proper design, while some other dynamic characteristics of the system such as dynamic transmission error are to be determined for more critical designs. Numerous different models have been suggested for the dynamic analysis of geared systems. These models differ both in the effects included and in the basic assumptions made. A continuous system model is used in this analysis in order to determine the torsional natural frequencies of a gear shaft system composed of two gears, two shafts and two inertias representing the drive and the load. Gear mesh is modelled as a spring connected between two gears. The natural frequencies of the same system are also calculated by using a four degree of freedom classical discrete model in which shaft masses are ignored. The percentage differences in the natural frequencies calculated with the discrete and continuous system models are determined for several values of some nondimensional system parameters. The results are presented in graphical form in terms of the nondimensional parameters defined. Some conclusions which may be important for designers are drawn.

Dynamic Analysis of a Towed Underwater Vehicle System: Model Validation

2004 ◽  
Author(s):  
Gry Karin Haugen ◽  
Mads Grahl-Madsen
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Model ◽  
Dynamic Behaviour ◽  
Equations Of Motion ◽  
Underwater Vehicle ◽  
Integrated System ◽  
System Model ◽  
Cable Model ◽  
Vehicle System ◽  
Successful Design

An integrated system consisting of two towed sub-sea vehicles and a free-floating probe is being developed to perform mapping and quantitative estimations for fish and plankton. A thorough understanding of the dynamic behaviour of the towed vehicle system is essential for a successful design, and a dynamic model that can accurately describe the vehicle behaviour under the influence of a wide variation of conditions, is necessary. This paper discusses two different approaches for the dynamic analysis of a towed vehicle system. Analyses are performed using the commercial available simulation program MOSES. Further the 2D equations of motion for the towed vehicle are developed and solved in Matlab using a simple cable model.

scholarly journals Dynamic Analysis of Telecommunication Tower for Optimum Modal Combination and Elemental Discretization

2019 ◽  
Vol 9 (1) ◽  
pp. 2229-2237
Keyword(s):  
Dynamic Analysis ◽  
Natural Frequencies ◽  
Response Spectrum ◽  
Continuous System ◽  
Ground Level ◽  
Optimum Number ◽  
Lumped Mass ◽  
Mass System ◽  
Static And Dynamic Analysis ◽  
The Past

Over the past 35 years, the growing demand for wireless and broadcast communication has spurred a dramatic increase in steel telecommunication tower construction and maintenance. Failure of such structures due to severe earthquakes is a major concern. The Indian code suggests the detailed static and dynamic analysis provisions that are to be followed for lumped mass systems like buildings. In case of continuous structures the code only suggests the static analysis provisions in details. But, due to the lack of detailed Indian codal provisions for dynamic analysis of telecommunication tower, a comparative study using response spectrum method is being carried out with the help of suitable software for different ground level conditions in case of India. According to the theoretical approach of any structural dynamics problem, the structures without lumped mass system is considered as continuous system which is further idealized as a series of small elemental segments. Furthermore, the structural analysis of these elemental segments using the concept of Finite Element Method (FEM) is being carried out with the help of the mentioned software and the results of natural frequencies, time periods of the structure are compared to obtain the optimum number of elemental discretization along with the optimum method of modal combination.

A Continuous System Model of Adrenocortical Function

1968 ◽  
pp. 141-184 ◽  
Author(s):  
F. E. Yates ◽  
R. D. Brennan ◽  
J. Urquhart ◽  
M. F. Dallman ◽  
C. C. Li ◽  
...  
Keyword(s):  
Continuous System ◽  
System Model ◽  
Adrenocortical Function

scholarly journals Effect of System Parameters on Natural Frequency of the Pelton Turbine

2018 ◽  
Vol 4 ◽  
pp. 75-81
Author(s):  
Laxman Motra ◽  
Sanjeev Karki
Keyword(s):  
Natural Frequency ◽  
Rotational Speed ◽  
Turbine Unit ◽  
Continuous System ◽  
System Model ◽  
System Parameters ◽  
Pelton Turbine ◽  
Backward Whirl

The effect of diameter, length and rotational speed of shaft, and mass of runner-buckets assembly on the natural frequency of the Pelton turbine unit was analyzed. Effect of the decisive parameters on the natural frequency of the unit showed that it was directly proportional to the diameter of the shaft and inversely proportional to the length of the shaft and mass of the runner-buckets assembly. For the continuous system model, when the rotational speed of the shaft increased, the natural frequency for the forward whirl also increased but the natural frequency decreased for the backward whirl.

VIBRATION ISOLATION SYSTEM WITH ACTIVE STIFFNESS CONTROL

2015 ◽  
Vol 76 (12) ◽  
Author(s):  
Muhajir Ab. Rahim ◽  
Mohd Shukry Abdul Majid ◽  
Mohamad Arinal Abd Halim
Keyword(s):  
Literature Review ◽  
Dynamic Analysis ◽  
System Performance ◽  
Vibration Isolation ◽  
System Model ◽  
Theoretical Equation ◽  
Force Response ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Stiffness Control

This paper presents the dynamic analysis of a linear isolator under active stiffness control. Firstly, the literature review on the active stiffness and the concept of skyhook spring are presented. Then, based on the theoretical equation govern the isolation system model, the effect of active stiffness control in the absolute motion transmissibility performance is studied. In addition, the force response of the isolation system under active stiffness control is also examined to highlight its benefits in improving the isolation system performance.

Dynamical Analysis of Wind Turbine Helical Gear System Based on Flexible Supporting

2014 ◽  
Vol 672-674 ◽  
pp. 320-324
Author(s):  
Yu Feng Yin ◽  
Ya Li Na ◽  
Yong Jian Li
Keyword(s):  
Dynamic Analysis ◽  
Wind Turbine ◽  
Working Condition ◽  
Helical Gear ◽  
Gear System ◽  
System Model ◽  
Dynamical Analysis ◽  
Wind Loading ◽  
Combined Method ◽  
Vibration Displacement

The effects of flexible tower supporting on wind turbines helical gear system was discussed. Using speed-combined method, the random speed model of wind was established and the wind loading was obtained. The helical gear system model of wind turbine was built under flexible supporting of the tower. The vibration displacement responses of each shaft were simulated and compared with response under rigid supporting. The results shows that the amplitude of vibration displacements under flexible supporting are generally higher and closer to the actual working condition, and considering the effects of flexible supporting of tower on system is necessary to the dynamic analysis.

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