A transfer matrix method based large-signal dynamic model for multielectrode DFB lasers

1994 ◽  
Vol 30 (11) ◽  
pp. 2458-2466 ◽  
Author(s):  
M.G. Davis ◽  
R.F. O'Dowd
Keyword(s):  
Dynamic Model ◽  
Transfer Matrix ◽  
Transfer Matrix Method ◽  
Matrix Method ◽  
Large Signal ◽  
Signal Dynamic

Research on Spatial Multidimensional Vibration Characteristics of Flexible Mechanical Arms with Complex Configuration

2014 ◽  
Vol 1030-1032 ◽  
pp. 1233-1236
Author(s):  
Cui Ping Liu ◽  
Rui Huo ◽  
Shu Ying Li ◽  
Xing Ke Cui ◽  
Dao Kun Zhang
Keyword(s):  
Internal Structure ◽  
Dynamic Model ◽  
Transfer Matrix ◽  
Transfer Matrix Method ◽  
Matrix Method ◽  
Complex Configuration ◽  
Flexible Manipulator ◽  
Evaluation Index ◽  
Structure Parameters ◽  
Vibration Displacement

Mechanical arm plays an important role in the mechanical systems, which is widely implemented in many engineering areas. Nowadays, the flexible manipulator attracts wide attention due to its flexibility. In this paper, implemented considering the complex configuration of the flexible manipulator system, especially the flexibility of flexible mechanical arms and joints, the dynamic model is established by using mechanical admittance and transfer matrix method. In this model, the compound vibration displacement of flexible manipulator is defined as evaluation index. Taking the double flexible mechanical arm as an example, the internal structure parameters and the influence of external configuration of the terminal compound vibration displacement are analyzed respectively.

An Investigation on Dynamic Characteristics of a Gas Turbine Rotor Using an Improved Transfer Matrix Method

2013 ◽  
Vol 135 (12) ◽  
Author(s):  
Cheng Meng ◽  
Ming Su ◽  
Shaobo Wang
Keyword(s):  
Gas Turbine ◽  
Dynamic Model ◽  
Transfer Matrix ◽  
Dynamic Characteristics ◽  
Transfer Matrix Method ◽  
Matrix Method ◽  
Mode Shapes ◽  
Correction Coefficient ◽  
Critical Speeds ◽  
Contact Effects

This paper presents an investigation on dynamic characteristics of a rod-fastened rotor. Based on the framework of a traditional Riccati transfer matrix method (TMM), an improved Riccati TMM considering contact effects brought by a face tooth is developed. A correction coefficient for equivalent stiffness imported from a three-dimensional (3D) finite element contact case analysis is defined to evaluate the contact effects, and then the dynamic model of the rod-fastened rotor including bearing support is established. A computer program is further developed to obtain the dynamic characteristics such as critical speeds of lateral vibration, mode shapes, and an unbalance response. The improved TMM is applied to investigate the dynamic characteristics of a real central tie rod rotor of the class-F gas turbine for verification of its effectiveness, and the calculated critical speeds are in good agreement with test measurement results, implying that the method is accurate and the dynamic model is reliable. This approach can also be applied to analyze other combined rotors with a homogeneous structure.

scholarly journals Dynamic Characteristics of Magnetic Suspended Dual-Rotor System by Riccati Transfer Matrix Method

2019 ◽  
Vol 2019 ◽  
pp. 1-22
Author(s):  
Dongxiong Wang ◽  
Nianxian Wang ◽  
Kuisheng Chen ◽  
Chun Ye
Keyword(s):  
Dynamic Model ◽  
Transfer Matrix ◽  
Dynamic Characteristics ◽  
Transfer Matrix Method ◽  
Matrix Method ◽  
Weight Ratio ◽  
Rotor System ◽  
Mode Shapes ◽  
Outer Rotor ◽  
The Relationship

The magnetic suspended dual-rotor system (MSDS) can effectively increase the thrust weight ratio of aeroengines. However, the MSDS dynamic characteristics have rarely been investigated. In this research, a MSDS with the outer rotor supported by two active magnetic bearings (AMBs) is designed, and the PID control is employed. The Riccati transfer matrix method using complex variables is adopted to establish the MSDS dynamic model. Subsequently, the influences of AMBs’ control parameters on the MSDS dynamic characteristics are explored. According to the analysis, two rigid mode shapes remain unchanged with the variation of the relationship between their corresponding damped critical speeds (DCSs). Moreover, the rigid DCSs disappear with large derivative coefficient. Eventually, the validity of the dynamic model and the appearance of rigid DCSs are verified.

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