A Modal Transient Simulation Model for Flexible Asymmetric Rotors

1976 ◽  
Vol 98 (1) ◽  
pp. 312-319 ◽  
Author(s):  
D. W. Childs
Keyword(s):  
Simulation Model ◽  
Dynamic Behavior ◽  
Transient Simulation ◽  
Synchronous Motion ◽  
Stiffness Properties ◽  
Transient Simulations ◽  
Modal Coordinates ◽  
Physical Dimensions

A simulation model is developed which accounts for an orthotropic as opposed to an axisymmetric rotor, i.e., rotors are considered whose stiffness and inertial properties in two mutually orthogonal planes are different. A rotor-fixed formulation is employed to define the rotor’s elastic deflections. Favorable characteristics of this formulation are that (a) the rotor’s inertial and stiffness properties are constant, and (b) the modal coordinates are nonoscillatory during synchronous motion. The validity of the formulation is verified by conducting transient simulations for a rotor having the approximate physical dimensions of a two-pole 500 MW alternator. The simulation model correctly simulates the rotor’s theoretically predicted dynamic behavior.

Simulation Model of the Dynamic Behavior of a Tire Running Over an Obstacle

1988 ◽  
Vol 16 (2) ◽  
pp. 62-77 ◽  
Author(s):  
P. Bandel ◽  
C. Monguzzi
Keyword(s):  
Simulation Model ◽  
Dynamic Behavior ◽  
Black Box ◽  
Box Model ◽  
Vehicle Suspension ◽  
Empirical Relationships ◽  
Static Tests ◽  
High Speeds ◽  
Dynamic Forces ◽  
Vehicle Suspension System

Abstract A “black box” model is described for simulating the dynamic forces transmitted to the vehicle hub by a tire running over an obstacle at high speeds. The tire is reduced to a damped one-degree-of-freedom oscillating system. The five parameters required can be obtained from a test at a given speed. The model input is composed of a series of empirical relationships between the obstacle dimensions and the displacement of the oscillating system. These relationships can be derived from a small number of static tests or by means of static models of the tire itself. The model can constitute the first part of a broader model for description of the tire and vehicle suspension system, as well as indicating the influence of tire parameters on dynamic behavior at low and medium frequencies (0–150 Hz).

Modeling the Work of a Torque Converter during the Getaway Process of a Vehicle

2016 ◽  
Vol 823 ◽  
pp. 253-258
Author(s):  
Constantin Ovidiu Ilie ◽  
Octavian Alexa ◽  
Ion Lespezeanu ◽  
Marin Marinescu ◽  
Dănuț Grosu
Keyword(s):  
Simulation Model ◽  
Dynamic Behavior ◽  
Torque Converter ◽  
Virtual Simulation ◽  
Virtual Model ◽  
Performance Parameters ◽  
Transient Regimes ◽  
Modeling Process ◽  
Time Histories ◽  
Angular Velocities

The paper aims at issuing of a virtual simulation model that would be able to assess the actual working modes of a torque converter, both hydraulically and mechanically. To estimating the dynamic behavior we used the assessing equations of the converter’s performance coefficients. The rotational inertial phenomena due to the transient regimes during the getaway phase are also considered. The modeling process assumed the use of the pre-defined structures of the Simulink-Matlab and Simscape-Matlab modules. The virtual model of the torque converter was fed with the experimentally determined, performance parameters as input. The input also consisted of the inertia moments of the converter’s components. Eventually, by interrogating the simulation model, we’ve got and plotted the time histories of the converter’s impeller and turbine angular velocities during the vehicle’s getaway process.

scholarly journals Effects of Separation Strategy on Deployment of Multitethered Chain-Type Satellite System

2016 ◽  
Vol 2016 ◽  
pp. 1-15
Author(s):  
Jinxiu Zhang ◽  
Zhigang Zhang
Keyword(s):  
Dynamic Behavior ◽  
Satellite System ◽  
Synchronous Motion ◽  
System A ◽  
Separation Velocity ◽  
Spring Mechanism ◽  
Separation Strategy ◽  
Three Body ◽  
Newtonian Method ◽  
Chain Type

This paper investigates the effects of separation strategy and parameters related to deployment on the dynamic behavior of multitethered chain-type satellite system. The system, including several satellites connected by tethers which are considered as massless and straight, is modeled as an extension of a two-body dumbbell tethered system. The dynamic equations of system in absence of perturbations and external disturbances are derived using Newtonian Method. To observe the effect of deployment rate on the motion of system, a parametric analysis of the deployment of a three-body tethered system with different deployment rates is carried out. Moreover, a four-body tethered system is used to investigate the effect of separation strategies on the dynamic behavior of system during the deployment phase. The numerical results suggest that the system with simultaneous separation costs less time to complete the deployment. If the ratio of deployment rates is in consistence with that of their desired lengths, the tethers deployed simultaneously would have a synchronous motion. It is also observed that the system employing separation bolt has a better performance than the system separated by spring mechanism since the larger separation velocity which is not along local vertical may cause a rotation.

The practical CT transient simulation model based on dynamic tests and its application

2018 ◽  
Vol 14 (2) ◽  
pp. 221-230
Author(s):  
Xuanwei Qi ◽  
Yutian Ye ◽  
Song Wang ◽  
Chengyu Lu ◽  
Xiaohua Xuan ◽  
...  
Keyword(s):  
Simulation Model ◽  
Transient Simulation ◽  
Dynamic Tests ◽  
Model Based
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