Research on Performances of Hybrid Actuation System with Dissimilar Redundancies

2012 ◽  
Vol 430-432 ◽  
pp. 1559-1563 ◽  
Author(s):  
Li Ming Yu ◽  
Zi Qing Ye
Keyword(s):  
Operating Mode ◽  
Development Trend ◽  
Hydraulic Actuator ◽  
Actuation System ◽  
Electric Aircraft ◽  
Hybrid Actuation ◽  
Actuation Systems ◽  
The Development Trend ◽  
More Electric Aircraft ◽  
Mode A

Hybrid actuation system (HAS) with dissimilar redundancies conforms to the development trend of future actuation systems in more electric aircraft (MEA). Hybrid Actuation system is composed of a traditional servo valve controlled hydraulic actuator (SHA) and an electro-hydraulic actuator (EHA). It has two operating models, active/passive mode (A/P) and active/active mode (A/A). In A/A model both actuators are actively controlled. Corresponding to A/A model, SHA is actively controlled and EHA is passively controlled in A/P model. The hybrid actuation system is built in the AMESim simulation environment, comparative analysis is performed when system operates in these two modes, such as signal response and force fighting. The simulation results provide a guideline to determine the specific operating mode of the system in different circumstances.

Reliability Analysis of Hybrid Actuation Based on GSPN

2012 ◽  
Vol 430-432 ◽  
pp. 1914-1917
Author(s):  
Li Ming Yu ◽  
Shou Qiang Wei ◽  
Tian Tian Xing ◽  
Hong Liang Liu
Keyword(s):  
Petri Nets ◽  
System Reliability ◽  
Operating Mode ◽  
Stochastic Petri Nets ◽  
Hydraulic Actuator ◽  
Reliability Models ◽  
Operating Modes ◽  
Actuation System ◽  
Generalized Stochastic Petri Nets ◽  
Hybrid Actuation

Generalized stochastic Petri nets is adopted to develop the reliability models of two operating modes of the hybrid actuation system, which is composed of a SHA (Servo valve controlled Hydraulic Actuator), an EHA (Electro-Hydrostatic Actuator) and an EBHA (Electrical Back-up Hydrostatic Actuator).The dependability of hybrid actuation is got through the Markov chain which the Petri nets sate is isomorphic to and the Monte-Carlo simulation. Simulations are conducted to analyze influences of the operating mode and the fault coverage on system reliability of hybrid actuation system.

Theoretical Modeling for Electroactive Polymer-Ceramic Hybrid Actuation Systems

Aerospace ◽  
2004 ◽  
Author(s):  
Tian-Bing Xu ◽  
Ji Su
Keyword(s):  
Performance Optimization ◽  
High Performance ◽  
Electroactive Polymer ◽  
Actuation System ◽  
Electromechanical Responses ◽  
Electromechanical Performance ◽  
New Type ◽  
Hybrid Actuation ◽  
Actuation Systems ◽  
Further Development

An electroactive polymer-ceramic hybrid actuation system (HYBAS) was recently developed. The HYBAS demonstrates significantly-enhanced electromechanical performance by utilizing advantages of cooperative contributions of the electromechanical responses of an electrostrictive copolymer and an electroactive single crystal. The hybrid actuation system provides not only a new type of device but also a concept to utilize different electroactive materials in a cooperative and efficient method for optimized electromechanical performance. In order to develop an effective procedure to optimize the performance of a hybrid actuation system (HYBAS), a theoretical model has been developed, based on the elastic and electromechanical properties of the materials utilized in the system and on the configuration of the device. The model also evaluates performance optimization as a function of geometric parameters, including the length of the HYBAS and the thickness ratios of the constituent components. The comparison between the model and the experimental results shows a good agreement and validates the model as an effective method for the further development of high performance actuating devices or systems for various applications.

scholarly journals Architecture Optimization of More Electric Aircraft Actuation System

2011 ◽  
Vol 24 (4) ◽  
pp. 506-513 ◽  
Author(s):  
Haitao QI ◽  
Yongling FU ◽  
Xiaoye QI ◽  
Yan LANG
Keyword(s):  
Actuation System ◽  
Electric Aircraft ◽  
Architecture Optimization ◽  
More Electric Aircraft

scholarly journals Design and operating mode analysis of hybrid actuation system based on EHA/SHA

2018 ◽  
Vol 2018 (13) ◽  
pp. 385-391
Author(s):  
Liu Zidong ◽  
Bai Zhiqiang ◽  
Xu Shuhan
Keyword(s):  
Operating Mode ◽  
Mode Analysis ◽  
Actuation System ◽  
Hybrid Actuation

scholarly journals Active Fault-Tolerant Control Strategy for More Electric Aircraft under Actuation System Failure

Actuators ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 122
Author(s):  
Xiaozhe Sun ◽  
Xingjian Wang ◽  
Zhiyuan Zhou ◽  
Zhihan Zhou
Keyword(s):  
Hydraulic System ◽  
Active Fault ◽  
Fault Tolerant ◽  
Hydraulic Loss ◽  
System Failure ◽  
Actuation System ◽  
Electric Aircraft ◽  
Differential Thrust ◽  
More Electric Aircraft ◽  
Tail Damage

The aircraft hydraulic system is very important for the actuation system and its failure has led to a number of catastrophic accidents in the past few years. The reasons for hydraulic loss can be leakage, blockage, and structural damage. Fortunately, the development of more electric aircraft (MEA) provides a new means of solving this difficult problem. This paper designs an active fault tolerant control (AFTC) method for MEA suffering from total hydraulic loss and actuation system failure. Two different kinds of scenarios are considered: leakage/blockage and vertical tail damage. With the application of the dissimilar redundant actuation system (DRAS) in MEA, a switching mechanism can be used to change the hydraulic actuation (HA) system into an electro-hydrostatic actuation (EHA) system when the whole hydraulic system fails. Taking account of the gap between HA and EHA, a degraded model is built. As for vertical tail damage, engine differential thrust control is adopted to help regain lateral-directional stability. The engine thrust dynamics are modeled and the mapping relationship between engine differential thrust and rudder deflection is formulated. Moreover, model reference control (MRC) and linear quadratic regulator (LQR) are used to design the AFTC method. Comparative simulation with the NASA generic transportation model (GTM) is carried out to prove the proposed strategy.

Experimental Validation of a Hybrid Electrostrictive Hydraulic Actuator Analysis

2010 ◽  
Vol 132 (2) ◽  
Author(s):  
Anirban Chaudhuri ◽  
Norman M. Wereley
Keyword(s):  
Active Material ◽  
Length Change ◽  
Domain Model ◽  
Basic Operation ◽  
Fluid Inertia ◽  
Hydraulic Actuator ◽  
Factors Affecting ◽  
Actuation System ◽  
Viscous Losses ◽  
Hybrid Actuation

The basic operation of smart material-based hybrid electrohydraulic actuators involves high frequency bidirectional length change in an active material stack (or rod) that is converted to unidirectional motion of a hydraulic fluid by a set of valves. In this study, we present the design and measured performance of a compact hybrid actuation system driven by the single-crystal electrostrictive material PMN-32%PT. The active material was actuated at different frequencies with variations in the applied voltage, fluid bias pressure, and external load to study the effects on output velocity. The maximum actuator velocity was 330 mm/s and the corresponding flow rate was 42.5 cc/s; the blocked force of the actuator was 63 N. The results of the experiments are presented and compared with simulation data to validate a nonlinear time-domain model. Linearized equations were used to represent the active material while the inertia, viscous losses, and compressibility of the fluid were included using differential equations. Factors affecting system performance are identified and the inclusion of fluid inertia in the model is also justified.

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