Study on adaptive torsional vibration suppression methods for helicopter/turboshaft engine system with variable rotor speed

2020 ◽  
Author(s):  
Yong Wang ◽  
Qiangang Zheng ◽  
Dawei Fu ◽  
Haibo Zhang
Keyword(s):  
Torsional Vibration ◽  
Vibration Suppression ◽  
Rotor Speed ◽  
Engine System ◽  
Turboshaft Engine

scholarly journals The LQG/LTR control method for turboshaft engine with variable rotor speed based on torsional vibration suppression

2019 ◽  
Vol 39 (4) ◽  
pp. 1145-1158
Author(s):  
Yong Wang ◽  
Qiangang Zheng ◽  
Haibo Zhang ◽  
Mingyang Chen
Keyword(s):  
Torsional Vibration ◽  
Vibration Suppression ◽  
Control Method ◽  
Rapid Response ◽  
Transmission Model ◽  
Rotor Speed ◽  
Linear Quadratic ◽  
Variable Model ◽  
Response Control ◽  
Turboshaft Engine

In order to realize the rapid response control for turboshaft engine during the process of variable rotor speed, the linear quadratic Gaussian with loop transfer recovery (LQG/LTR) control method for turboshaft engine based on torsional vibration suppression is proposed. Firstly, the two-speed dual clutch transmission model is applied to realize the variable rotor speed of helicopter. Then, based on the state variable model of turboshaft engine, the proper LQG/LTR controller is available. In order to eliminate the limitation of low-order torsional vibration on the bandwidth of LQG/LTR controller, a frequency-domain analysis method for the effect of torsional vibration suppression on LQG/LTR controller performance is developed. Finally, the numerical simulation is conducted to verify the LQG/LTR control for turboshaft engine with variable rotor speed based on torsional vibration suppression. The results show that the bandwidth of the LQG/LTR control loop can increase by 2–3 times under torsional vibration suppression. Meanwhile, when the rotor speed varies continuously by 40%, the overshoot and sag of the power turbine speed can decrease to less than 2% through LQG/LTR controller based on torsional vibration suppression, which achieves the rapid response control of the turboshaft engine.

A Study on Torsional Vibration Suppression Method for an Integrated Helicopter / Engine System

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Yong Wang ◽  
Qiangang Zheng ◽  
Haibo Zhang ◽  
Mingyang Chen
Keyword(s):  
Torsional Vibration ◽  
Vibration Suppression ◽  
Notch Filter ◽  
Control Unit ◽  
Rotor Speed ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Remarkable Effect ◽  
Engine Model ◽  
Engine System

Abstract In order to solve the problem of torsional vibration instability of control unit in helicopter/engine system during maneuver flight, this paper has conducted the research on the integrated torsional vibration suppression of helicopter/engine system. Firstly, an integrated helicopter/engine model combined with torsional vibration is established based on the UH-60 helicopter model. Then the torsional vibration filter that is composed of a notch filter and a low-pass filter is applied to speed control loop of the engine to suppress the torsional vibration of power turbine speed. It is shown that the integrated helicopter/engine model combined with torsional vibration can simulate the torsional vibration characteristics under variable rotor speed, and both the low-order and high-order amplitudes of torsional vibration can be effectively eliminated below 0.04 % at constant rotor speed through utilizing the torsional vibration filter. Meanwhile, when the helicopter operates under variable rotor speed, the fundamental frequency of torsional vibration varies from 1.30 Hz to 2.30 Hz. However, all torsional vibration amplitudes within this frequency range can be damped less than 0.05 % through the notch filter whose bandwidth is 2.3 Hz, which proves the remarkable effect of torsional vibration suppression.

scholarly journals Research on predictive control of helicopter/engine based on LMS adaptive torsional vibration suppression

2018 ◽  
Vol 37 (4) ◽  
pp. 1151-1163 ◽  
Author(s):  
Yong Wang ◽  
Qiangang Zheng ◽  
Haibo Zhang ◽  
Haoying Chen
Keyword(s):  
Adaptive Filter ◽  
Torsional Vibration ◽  
Vibration Suppression ◽  
Notch Filter ◽  
Fast Response ◽  
Support Vector ◽  
Mean Square ◽  
Least Mean Square ◽  
Predictive Controller ◽  
Turboshaft Engine

In order to achieve the fast response of turboshaft engine combined with torsional vibration, a predictive controller of helicopter/engine based on the least mean square adaptive torsional vibration suppression is proposed and designed. First, in order to make up for the insufficiency of conventional notch filter on torsional vibration suppression with changeable frequency under variable rotor speed, an adaptive one based on least mean square is presented in the process of helicopter autorotation downward. Then, based on the least mean square adaptive filter, a predictive controller based on the support vector regression is proposed to compensate for the dynamic control performance in helicopter autorotation recovery process. It is shown that least mean square adaptive filter can suppress all low-order torsional vibrations with amplitude less than 15% in comparison with the notch filter, which proves the more remarkable ability of adaptive torsional vibration suppression. Meanwhile, the droop of power turbine speed can be reduced to less than 0.3% with the steady-state error no more than 0.01% by adopting the predictive controller based on least mean square adaptive torsional vibration suppression. The fast response and high-quality control of turboshaft engine has been realized.

A Study on Nonlinear Model Predictive Control for Helicopter/Engine with Variable Rotor Speed Based on Linear Kalman Filter

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Yong Wang ◽  
Qiangang Zheng ◽  
Haibo Zhang ◽  
Yuan Gao
Keyword(s):  
Kalman Filter ◽  
Model Predictive Control ◽  
Predictive Control ◽  
Nonlinear Model ◽  
Torsional Vibration ◽  
Vibration Suppression ◽  
Control Method ◽  
Notch Filter ◽  
Nonlinear Model Predictive Control ◽  
Rotor Speed

Abstract A novel control method combining nonlinear model predictive control (NMPC) with linear kalman filter (LKF) and adaptive notch filter (ANF) for an integrated helicopter/engine system with variable rotor speed is proposed to enhance the response ability of turboshaft engine. Firstly, based on the integrated helicopter/engine model with variable rotor speed, an ANF combined with frequency estimation is introduced. Then, in order to estimate the significant and unmeasurable performance parameters utilized in model predictive control, such as temperature before turbine, a nonlinear model predictive controller based on LKF is presented. The simulation verifications demonstrate that the fundamental frequency of torsional vibration changes from 1.30 Hz to 2.70 Hz when the rotor speed varies continuously by 50 %. In this case, compared with the notch filter, all torsional vibration amplitudes are damped below 0.1 % by ANF. Meanwhile, in comparison with the PID controller, the NMPC can reduce the overshoot and droop of the power turbine speed to less than 1 % with steady-state error no more than 0.5 % at the off-design point of NMPC based on adaptive torsional vibration suppression. The applications of LKF and similar transformation improve the control accuracy and robustness performance of the NMPC designed at a single operating point.

scholarly journals Adaptive Control and Predictive Control for Torsional Vibration Suppression in Helicopter/Engine System

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 23896-23906 ◽  
Author(s):  
Yong Wang ◽  
Qiangang Zheng ◽  
Haibo Zhang ◽  
Lizhen Miao
Keyword(s):  
Adaptive Control ◽  
Predictive Control ◽  
Torsional Vibration ◽  
Vibration Suppression ◽  
Engine System

Forced Torsional Vibration of Systems With Distributed Mass and Internal and External Damping

1959 ◽  
Vol 26 (1) ◽  
pp. 8-12
Author(s):  
K. E. Bisshopp
Keyword(s):  
Distributed Systems ◽  
Boundary Value Problem ◽  
Excellent Agreement ◽  
Torsional Vibration ◽  
Homogeneous System ◽  
External Torque ◽  
Applied Torque ◽  
Engine System ◽  
Special Case ◽  
General Boundary Value Problem

Abstract This analysis extends similar results previously obtained in a paper by Den Hartog and Li, where the remainder torque is calculated at one end of a homogeneous system. Comparative computations made there with complex Holzer tables show excellent agreement with results obtained from the theory of distributed systems. The general boundary-value problem, including the response to an externally applied torque at any section, is solved in this paper. The special case of a homogeneous engine system with a flywheel at one end is analyzed in detail. The theory is illustrated with comparative computations using complex Holzer tables for such a system with external torque applied at a section remote from the ends. Again, numerical results obtained by both methods are in excellent agreement.

scholarly journals Output Control of Three-Axis PMSG Wind Turbine Considering Torsional Vibration Using H Infinity Control

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3474
Author(s):  
Kosuke Takahashi ◽  
Nyam Jargalsaikhan ◽  
Shriram Rangarajan ◽  
Ashraf Mohamed Hemeida ◽  
Hiroshi Takahashi ◽  
...  
Keyword(s):  
Control System ◽  
Wind Turbine ◽  
Wind Power ◽  
Torsional Vibration ◽  
Vibration Suppression ◽  
Current Control ◽  
Metal Fatigue ◽  
Power Generator ◽  
Term Operation ◽  
Wind Power Generator

Due to changes in wind, the torque obtained from the wind turbine always fluctuates. Here, the wind turbine and the rotor of the generator are connected by a shaft that is one elastic body, and each rotating body has different inertia. The difference in inertia between the wind turbine and the generator causes a torsion between the wind generator and the generator; metal fatigue and torsion can damage the shaft. Therefore, it is necessary to consider the axial torsional vibration suppression of a geared wind power generator using a permanent magnet synchronous generator (PMSG). In addition, errors in axis system parameters occur due to long-term operation of the generator, and it is important to estimate for accurate control. In this paper, we propose torque estimation using H ∞ observer and axial torsional vibration suppression control in a three inertia system. The H ∞ controller is introduced into the armature current control system (q-axis current control system) of the wind power generator. Even if parameter errors and high-frequency disturbances are included, the shaft torsional torque is estimated by the H ∞ observer that can perform robust estimation. Moreover, by eliminating the resonance point of the shaft system, vibration suppression of the shaft torsional torque is achieved. The results by the proposed method can suppress axial torsional vibration and show the effect better than the results using Proportional-Integral (PI) control.

Torsional Vibration Suppression by a Centrifugal Pendulum Vibration Absorber

2005 ◽  
Author(s):  
Yukio Ishida ◽  
Tsuyoshi Inoue ◽  
Taishi Kagawa ◽  
Motohiko Ueda
Keyword(s):  
Torsional Vibration ◽  
Large Amplitude ◽  
Vibration Suppression ◽  
Torsional Vibrations ◽  
Vibration Absorbers ◽  
Harmonic Vibrations ◽  
Centrifugal Pendulum Vibration Absorbers ◽  
Automobile Engines ◽  
Large Amplitude Vibration ◽  
Driving Torque

Driving torque of rotating machinery, such as automobile engines, changes periodically. As a result, torsional vibrations occur and cause serious noise and vibration problems. In this study, the dynamic characteristics of centrifugal pendulum vibration absorbers restraining torsional vibration is investigated both theoretically and experimentally. In the theoretical analysis, the nonlinear characteristics are taken into consideration under the assumption of large amplitude vibration of pendulum. It is clarified that the centrifugal pendulum, although it has remarkable effects on suppressing harmonic vibration, induces large amplitude harmonic vibrations, the second and third superharmonic resonances, and unstable vibrations of harmonic type. We propose various methods to suppress these secondarily induced vibration and show that it is possible to suppress torsional vibrations to substancially zero amplitude in all through the rotational speed range.

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