scholarly journals System Performance Analysis for Trimmable Horizontal Stabilizer Actuator Focusing on Nonlinear Effects: Based on Incremental Modelling and Parameter Identification Methodology

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6464
Author(s):  
Wensen Zhang ◽  
Jian Fu ◽  
Yongling Fu ◽  
Jinlin Zhou ◽  
Xudong Han
Keyword(s):  
Parameter Identification ◽  
System Performance ◽  
Power Transmission ◽  
Mechanical Load ◽  
Transmission Function ◽  
Nonlinear Effects ◽  
Load Path ◽  
Servo Actuator ◽  
Hydraulic Servo ◽  
Working Principle

With the development of more/all electric aircraft, replacement of the traditional hydraulic servo actuator (HSA) with an electromechanical actuator (EMA) is becoming increasingly attractive in the aerospace field. This paper takes an EMA for a trimmable horizontal stabilizer as an example and focuses on how to establish a system model with an appropriate level of complexity to support the model-based system engineering (MBSE) approach. To distinguish the nonlinear effects that dominate the required system performance, an incremental approach is proposed to progressively introduce individual nonlinear effects into models with different complexity levels. Considering the special design and working principle of the mechanical power transmission function for this actuator, the nonlinear dynamics, including friction and backlash from the no-back mechanism, and the nonlinear compliance effect from the mechanical load path are mainly taken into consideration. The modelling principles for each effect are addressed in detail and the parameter identification method is utilized to model these nonlinear effects realistically. Finally, the responses from each model and experimental results are compared to analyze and verify how each individual nonlinearity affects the system’s performance.

Study on the Compensated Capacitance for the Wireless Power Transmission System

2014 ◽  
Vol 525 ◽  
pp. 270-275
Author(s):  
Xiu Quan Liu ◽  
Yan Hong Li
Keyword(s):  
Output Power ◽  
Power Factor ◽  
System Performance ◽  
Power Transmission ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Load Voltage ◽  
In Series ◽  
Working Principle ◽  
Secondary Winding

The working principle of a Wireless Power Transmission technology (WPT) system and compensated capacitance topologies were introduced. Then, based on MATLAB SIMULINK software, capacitance compensated in the primary and secondary winding on the influence of the WPT system performance were studied. The results show that the primary compensated capacitance in series can improve the voltage of the load, the primary compensated capacitance in parallel can reduce the primary winding current; the secondary compensated capacitance can also improve the load voltage, but the rate is not obvious; in the SP model, the load voltage and power factor are the biggest, the influence of the variational capacitance in the primary on the output power is bigger than in the secondary

scholarly journals Modelling and transient response study of hydraulic servo actuator

2021 ◽  
Vol 1172 (1) ◽  
pp. 012037
Author(s):  
E E Ibrahim ◽  
T Elnady ◽  
I Saleh ◽  
S Hassan
Keyword(s):  
Transient Response ◽  
Servo Actuator ◽  
Hydraulic Servo

Visualization of Flow-Field between the Flapper and Nozzle in a Hydraulic Servo-Valve

2011 ◽  
Vol 402 ◽  
pp. 407-411 ◽  
Author(s):  
Jacob M. Mchenya ◽  
Sheng Zhuo Zhang ◽  
Song Jing Li
Keyword(s):  
Flow Field ◽  
High Speed ◽  
Video Camera ◽  
Computer Assisted ◽  
Servo Valve ◽  
High Speed Video ◽  
High Speed Video Camera ◽  
Hydraulic Servo ◽  
Working Principle ◽  
Computer Assisted Image

In order to understand the mechanism and get rid of the high-frequency self-excited noise in a hydraulic servo-valve, in this paper, the flow field distribution in the pilot stage of a hydraulic flapper-nozzle servo-valve is investigated. An assembly is prepared representing the construction and working principle of the flow field inside the pilot stage of a hydraulic flapper-nozzle servo-valve. A method of visualization is developed by taking videos for the flow field inside the transparent assembly with a high speed video camera. In this study, at different inlet pressure the high speed video camera was utilized for flow visualization together with computer-assisted image measurement. The shape of the jet flow, the cavitations and vortex flow inside the flow field can be visualized clearly. The proposed method enables to analyze the flow-field in the pilot stage of a hydraulic flapper-nozzle servo-valve by giving useful information for better design.

Effect of Nonlinear Characteristic of the Gas Turbine Engine Fuel System With Hardware-in-the-Loop

2018 ◽  
Author(s):  
Jinwei Chen ◽  
Jingxuan Li ◽  
Shengnan Sun ◽  
Huisheng Zhang
Keyword(s):  
Gas Turbine ◽  
Dead Zone ◽  
Gas Turbine Engine ◽  
Supply System ◽  
Hardware In The Loop ◽  
Nonlinear Characteristics ◽  
Turbine Engine ◽  
Zone Width ◽  
Servo Actuator ◽  
Hydraulic Servo

Fuel supply system, the regulation system for fuel delivery to the combustor, is one of the most important auxiliary systems in a gas turbine engine. Commonly, the fuel supply system was always simplified as a linear system. In fact, gas turbine engines almost use a hydromechanical main fuel control system which consists of electro-hydraulic servo actuator and fuel metering unit. These components have several nonlinear characteristics such as hysteresis, dead zone, relay, and saturator. These nonlinear characteristics can directly affect the performance a gas turbine engine. In this paper, a three-shaft gas turbine engine was taken as a research object. Firstly, a mechanism model of the fuel control system considering the nonlinear links was developed based on the hydro-mechanical theory. Then, the effect of dead zone-relay characteristic of the servo amplifier in electro-hydraulic servo actuator was analyzed. The results show that the dead zone width has great effect on the dynamic performance of the gas turbine engine. The fuel flow rate will be oscillating with small dead zone width. The parameters of the gas turbine engine will be stable with the increase of dead zone width. However, the larger dead zone width causes the hysteresis and the increase of the dynamic response time. At the same time, an improvement method with a two-dimensional fuzzy compensation was proposed. The results show that the fuzzy compensation can effectively solve the oscillation problem caused by the dead zone-delay. Finally, a Hardware-In-the-Loop (HIL) system is developed which is based on an electro-hydraulic servo actuator facility and a real-time software component of the gas turbine engine. An experiment is conducted on the HIL test rig to validate simulation result. The results show that the experiment matches well with the simulation results.

Modeling and nonlinear parameter identification for hydraulic servo-systems with switching properties

Mechatronics ◽  
2019 ◽  
Vol 61 ◽  
pp. 83-95 ◽  
Author(s):  
Clemens C. Maier ◽  
Simon Schröders ◽  
Wolfgang Ebner ◽  
Marius Köster ◽  
Alexander Fidlin ◽  
...  
Keyword(s):  
Parameter Identification ◽  
Nonlinear Parameter ◽  
Servo Systems ◽  
Hydraulic Servo ◽  
Nonlinear Parameter Identification

EHSA Primary Flight Controls Seals Wear Degradation Model

2018 ◽  
Author(s):  
Antonio C. Bertolino ◽  
Rocco Gentile ◽  
Giovanni Jacazio ◽  
Francesco Marino ◽  
Massimo Sorli
Keyword(s):  
Power Systems ◽  
Health Management ◽  
Research Activity ◽  
Degradation Model ◽  
Cross Section Area ◽  
Section Area ◽  
Starting Point ◽  
Flight Controls ◽  
Servo Actuator ◽  
Hydraulic Servo

Seals are widely used in hydraulic power systems to prevent fluid leakages. However, several types of degradation can decrease the performance of these components such as wear, which induces changes in the geometry of the cross-section area, influencing their sealing capability. Over the years, their behaviour has been primarily investigated with several theoretical and experimental researches. All these valuable results can be considered as a starting point for further investigations on the interaction between seals and the complete hydraulic equipment and on the root of seals degradation. This article proposes a physical model of performance degradation acting on dynamic seals of an electro-hydraulic servo-actuator (EHSA) ram for primary flight controls. In this article, a dynamic non-linear seals degradation model has been developed, based on the Hart-Smith hyperelasticity model, which physically describes the stress and strain of “rubber-like” materials. Similarly, wearing has been assessment by using the Archard’s equation. Furthermore, different operating temperatures have been considered to analyze the effect on seals performances. The integration between the mentioned seals degradation model and the high-fidelity model of the complete EHSA allows to evaluate the influence of various wear levels on the actuator behaviour. This research activity is inserted into a more extensive project of Prognostic and Health Management (PHM) of EHSAs. The results of the proposed simulations reveal how the performance of an EHSA can be affected by seals degradations.

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