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Aircraft flight control hydraulic servo actuator

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Aircraft Flight Control Hydraulic Servo ActuatorPublished: 2014 Edition Introduction "Aircraft Flight Control Hydraulic Servo Actuator" takes mechanical command hydraulic servo actuators as the main line, and the content expanded to mechanical-electrical command hydraulic servo actuators And electrical directive hydraulic servo actuators. "Airplane Flight Control Hydraulic Servo Actuator" is based on engineering practice. It is not just about design theory, but also focuses on the structural design of hydraulic servo actuators, but discusses the aircraft flight control hydraulic pressure from the perspective of the overall design of the aircraft. Performance design and engineering development issues of servo actuators and hydraulic servo actuator-control surface systems.
Chapter 2 Spool Valves and Spool Valve Flow Characteristics of Hydraulic Servo Actuators
2.1 Type of spool valve
2.2 Mathematical description of cylindrical spool valve flow
2.3 Flow characteristics of positive and zero overlap spool valves
2.3.1 Flow characteristics when spool opening e≥0
2.3.2 Flow characteristics when the spool opening e <0
2.4 Flow characteristics of negative overlap spool valve
2.4.1 Flow characteristics when the valve opening E≥e≥0 (E-e≥0)
2.4.2 Spool valve opening degree—Flow characteristics when E≤e <0 (E + e≥0)
2.4.3 Flow expression for negative overlap spool valve
2.4.4 Discuss the opening of the spool valve | e | ≤E
2.4.5 Features of flow characteristics of hydraulic servo actuators with negative overlap (pre-opening) spool valves
2.5 Expansion of flow characteristics of hydraulic servo actuators
2.6 Analysis of flow characteristics of hydraulic servo actuators
2.7 Hydraulic Servo Actuator Spool Valve-Throttled Flow Characteristics of Piping between Actuating Tubes
2.7.1 Flow characteristics when spool opening e≥0
2.7.2 Flow characteristics when spool opening e <0
2.7.3 Discussion
2.8 Effective opening area of cylindrical slide valve of hydraulic servo actuator
2.8.1 inclined plane cylindrical slide valve
2.8.2 Conical cylindrical slide valve
2.8.3 round hole-right-angle cylindrical slide valve
2.8.4 Right Angle Square Window-Right Angle Cylindrical Spool Valve
2.8.5 Rounded Square Window—Right Angle Cylindrical Spool Valve
2.8.6 Derivation of Effective Open Area Expression for Slant Plane Cylindrical Spool Valve
2.9 Other types of spool valves
2.9.1 Flat type slide valve with linear motion
2.9.2 Rotary Spool Valve
2.10 Hydrodynamic forces acting on cylindrical spool valves
2.10.1 Hydrodynamic force related to the speed of spool valve movement-mass force
2.10.2 Hydrodynamic force related to spool valve displacement-jet force
2.10.3 Derivation of Hydrodynamic Force
2.10.4 Discussion on Hydrodynamics Chapter 3 Mathematical Models of Mechanical Command Hydraulic Servo Actuators
3.1 Introduction
3.2 The working principle of the mechanical instruction hydraulic servo actuator
3.2.1 Principle block diagram of mechanical command hydraulic servo actuator
3.2.2 Mechanical command hydraulic servo actuator-control surface system diagram
3.3 Simulation model of hydraulic servo actuator-control surface system
3.3.1 Physical model of hydraulic servo actuator-control surface system
3.3.2 Mathematical model of hydraulic servo actuator-control surface system
3.3.3 Block diagram of hydraulic servo actuator-control surface system
3.3.4 Mathematical model and block diagram of mechanical command hydraulic servo actuator
3.3.5 System Mathematical Model and Block Diagram Considering the Stiffness and Clearance of Support Structure of Hydraulic Servo Actuator
3.4 Hydraulic servo actuators with different effective areas on both sides of the piston
3.4.1 Physical model of hydraulic servo actuators with different effective areas on both sides of the piston
3.4.2 Spool valve flow characteristics of hydraulic servo actuators with different effective areas on both sides of the piston
3.4.3 Spool valve flow characteristics of hydraulic servo actuators with different effective areas on both sides of the piston Chapter 4 Followability of hydraulic servo actuator
4.1 Followability is one of the main dynamic indicators of hydraulic servo actuators
4.2 Follow-up of no-load hydraulic servo actuator
4.3 General Requirements for Followability of Hydraulic Servo Actuators Chapter 5 Hydraulic Servo Actuators-Control Surface
5.1 Physical Concept of Hydraulic Servo Actuator-Control Surface System Stability
5.2 Determination of hydraulic servo actuator-control surface system stability
5.2.1 Direct observation method
5.2.2 Gullwitz stability criterion
5.2.3 Nyquist stability criterion
5.2.4 Energy method
5.3 Influential factors of hydraulic servo actuator-control surface system stability
5-4 Technical Measures to Improve the Stability of Hydraulic Servo Actuator-Control Surface System
5.5 Dynamic Stability Valve (RC Network)
5.6 Hydraulic servo actuator without fixed end
5.7 Hydraulic Servo Actuator Including Support Structure Displacement Feedback
5.7.1 Simulation model of hydraulic servo actuator-control surface system with support structure displacement feedback
5.7.2 Gullwitz Stability Criterion for Hydraulic Servo Actuator-Control Surface System Including Support Structure Displacement Feedback
5.7.3 Impact of Support Structure Displacement Gain on Hydraulic Servo Actuators on Servo Actuators and Systems
5.7.4 Example of Displacement Feedback Arrangement for Support Structure of Hydraulic Servo Actuator Chapter 6 Impedance Characteristics of Hydraulic Servo Actuator
6.1 Definition of impedance characteristics of hydraulic servo actuators
6.2 Mathematical description of hydraulic servo actuator impedance characteristics
6.3 Linearized impedance characteristics of hydraulic servo actuators
6.4 Technical measures to improve the impedance characteristics of hydraulic servo actuators
6.4.1 Increase stiffness
6.4.2 Increased damping
6.5 Impedance characteristics of hydraulic servo actuator-control surface system
6.5.1 Simulation model of impedance characteristics of hydraulic servo actuator-control surface system
6.5.2 Hydraulic servo actuator-control surface impedance characteristic curve
6.5.3 Discussion on impedance characteristics of hydraulic servo actuator-control surface system
6.6 Contours of linearized impedance characteristic curve
6.7 Impedance characteristics of damped modal hydraulic servo actuator
6.7.1 Physical model of damped modal hydraulic servo actuator
6.7.2 Mathematical model of damped modal hydraulic servo actuator
6.7.3 Impedance characteristics of damped modal hydraulic servo actuators and their curves
6.8 Conclusions Chapter 7 Electro-Hydraulic Servo Actuators
7.1 Electro-hydraulic servo actuator
7.2 Electro-hydraulic servo valve
7.3 Electrical command hydraulic servo actuator
7.3.1 Dynamics equations of electric command hydraulic servo actuator
7.3.2 Impedance characteristics of electric command hydraulic servo actuator
7.4 Hydraulic servo actuator with jet tube type electro-hydraulic servo valve
7.5 Mechanical—Electrical Instruction Hydraulic Servo Actuators
7.6 Electro-hydraulic servo actuator application precautions on aircraft
7.6.1 Cross-linking of electro-hydraulic servo actuators and mechanical flight control systems
7.6.2 Impact of Electro-Hydraulic Servo Actuator Circuit on Aircraft Circuit
7.6.3 Time Delay of Electro-Hydraulic Servo Actuators Chapter 8 Hydraulic Servo Actuator-Control Surface Design
8.1 Arrangement of Hydraulic Servo Actuator in Flight Control System
8.1.1 Selection of Hydraulic Servo Actuator Type
8.1.2 Selection of system transmission ratio and transmission coefficient
8.1.3 Hydraulic Servo Actuator—Effect of Control Surface Transmission Coefficient on Flight Control System Performance and Hydraulic Servo Actuator Parameters
8.1.4 Design of reversible and irreversible assisted flight control systems
8.1.5 Impact of hydraulic servo actuators on driver-induced oscillation
8.2 Simulation and test of hydraulic servo actuators and systems
8.2.1 Simulation of hydraulic servo actuators and systems
8.2.2 Mathematical models of "clearance" and "friction"
8.2.3 Application of mathematical model of hydraulic servo actuator
8.2.4 Testing of hydraulic servo actuators and systems
8.3 A similar method for studying the dynamic response of a hydraulic servo actuator-control surface system
8.3.1 Purpose of applying similar methods
8.3.2 Establishment of similar criteria
8.3.3 Establish similar criteria based on actual use
8.3.4 Using a similar method to calculate the stability boundary of a hydraulic servo actuator-control surface system
8.3.5 Conclusion
8.4 Technical requirements for hydraulic servo actuators
8.4.1 Raw data for technical requirements of hydraulic servo actuators
8.4.2 Static performance requirements of hydraulic servo actuators
8.4.3 Dynamic performance requirements of hydraulic servo actuators
8.4.4 Technical Measures to Improve Driver-induced Oscillation Trends
8.4.5 Working modal requirements
8.4.6 EMC requirements
8.4.7 Reliability, maintainability and testability requirements
8.4.8 Dimensions, weights and structural requirements
8.4.9 Quality assurance requirements
8.5 Vice spool valve
8.5.1 Structure and working principle of auxiliary spool valve
8.5.2 Working characteristics of auxiliary spool valve
8.5.3 Relation between working maximum flow (maximum speed) of auxiliary spool valve and stuck position of main spool valve
8.5.4 Flow characteristics of auxiliary spool valve
8.5.5 Dynamic performance of auxiliary spool valve
8.5.6 The main problems of the auxiliary spool valve Chapter 9 parameter measurement and calculation
9.1 Parameter measurement
9.1.1 Measurement and calculation of the moment of inertia of the control surface about the rotation axis
9.1.2 Measurement and calculation of mass moment of inertia of the manipulator about the axis of rotation
9.1.3 Measurement and calculation of system resonance frequency and damping coefficient
9.1.4 Derivation of Undamped Natural Frequency, Damped Natural Frequency and Resonant Frequency
9.2 Stiffness of hydraulic servo actuator
9.2.1 Elastic Modulus of Hydraulic Oil
9.2.2 Actuator rigidity determined by compressibility of hydraulic oil
9.2.3 Actuator rigidity determined by hydraulic servo actuator structure
9.2.4 Actuator rigidity determined by hydraulic conduit between main control valve and actuator
9.2.5 Actuator rigidity determined by compressibility of air-containing hydraulic oil, actuator structure, and hydraulic conduit
9.2.6 Actuator rigidity determined by internal leakage of hydraulic servo actuator
9.3 Equivalent damping coefficient of friction
9.4 Power of Hydraulic Servo Actuators Chapter 10 Main Technical Problems of Hydraulic Servo Actuators in Development and Use

飞机飞行控制液压伺服作动器 Aircraft Flight Control Hydraulic Servo Actuator

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