Open Loop Stability Analysis

2021 ◽  
pp. 13-54
Author(s):  
Christian Mayr
Keyword(s):  
Stability Analysis ◽  
Open Loop ◽  
Loop Stability

Open Loop Stability on Hybrid Synchronous Motor

2010 ◽  
Vol 121-122 ◽  
pp. 860-865
Author(s):  
Xue Zhen Chen
Keyword(s):  
Permanent Magnet ◽  
Harmonic Distortion ◽  
Synchronous Motor ◽  
Open Loop ◽  
Mathematics Model ◽  
Distortion Factor ◽  
Part D ◽  
Fraction Length ◽  
The Stability ◽  
Loop Stability

This paper searched open loop stability on hybrid synchronous motor which is made of a permanent magnet part and a reluctance part, there is important influence for the ratio k, the fraction length of the permanent magnet part, and the displaced angle α, the between the two part d-axis, the small-signal mathematics model was derived based on d-q reference frame, and optimized the appropriate k and α value considering the stability and the harmonic distortion factor (THD), The simulation results show that the model is correct.

Open-loop stable running

Robotica ◽  
2005 ◽  
Vol 23 (1) ◽  
pp. 21-33 ◽  
Author(s):  
Katja D. Mombaur ◽  
Richard W. Longman ◽  
Hans Georg Bock ◽  
Johannes P. Schlöder
Keyword(s):  
Optimization Methods ◽  
Open Loop ◽  
Bipedal Robots ◽  
Model Parameter ◽  
Stable Periodic ◽  
Parameter Values ◽  
Difficult Issue ◽  
Loop Stability

We present simulated monopedal and bipedal robots that are capable of open-loop stable periodic running motions without any feedback even though they have no statically stable standing positions. Running as opposed to walking involves flight phases which makes stability a particularly difficult issue. The concept of open-loop stability implies that the actuators receive purely periodic torque or force inputs that are never altered by any feedback in order to prevent the robot from falling. The design of these robots and the choice of model parameter values leading to stable motions is a difficult task that has been accomplished using newly developed stability optimization methods.

Closed-loop Stability Analysis of DC / DC Converter with Input Filter

2020 ◽  
Author(s):  
Zhisong Lin ◽  
Yong Liu ◽  
Xiaobin He ◽  
Wei Xie ◽  
Mengxue Dong ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Closed Loop ◽  
Input Filter ◽  
Loop Stability

Stability boundary analysis of highly flexible aircraft with control saturation and structural flexibility

2020 ◽  
Vol 234 (6) ◽  
pp. 1195-1208
Author(s):  
Liang Xu ◽  
Yuping Lu ◽  
Boyi Chen ◽  
Haidong Shen ◽  
Zhen He
Keyword(s):  
Closed Loop ◽  
Stability Boundary ◽  
Open Loop ◽  
Loop System ◽  
Control Signal ◽  
Stable Region ◽  
Structural Flexibility ◽  
Flexible Aircraft ◽  
Control Saturation ◽  
Loop Stability

In this work, a method has been presented to analyze the influence of control saturation and structural flexibility on the stable radius of highly flexible aircraft. A dynamic model of aircraft is constructed followed by the analysis of kinetic characteristics. In this paper, the closed-loop stability boundary of highly flexible aircraft with open-loop instability is studied. The amplitude limit and bandwidth limit of the control signal are considered in the closed-loop stability boundary calculation. Our analysis shows that the boundary is related to the left eigenvector corresponding to the unstable poles and the amplitude constraint of the control signals. Stability of the boundary of feedback control system further reduces the limitation of the bandwidth of actuators. Focused on the phugoid instability of highly flexible aircraft, computational formulation of the closed-loop stable boundary is achieved. The Monte Carlo analysis has been employed to validate the stable region, under the LQR controller. Both the theory and simulations have nice correlations with each other which verify the stability of the closed-loop system, restricted by the open-loop system, and the influence of control signal bandwidth constraints.

scholarly journals Loop stability analysis of boost circuit under globally dynamic compensation strategy

2019 ◽  
Vol 2019 (16) ◽  
pp. 1853-1857
Author(s):  
Xiaofan Wang ◽  
Yingna Guo ◽  
Weibin Cheng ◽  
Mingquan Leng
Keyword(s):  
Stability Analysis ◽  
Compensation Strategy ◽  
Dynamic Compensation ◽  
Loop Stability
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