Aviation Hydraulics / Research Papers / ID: 618847

Author: Vladislavs Altuhovs (53)

Evaluation:

Published: 15.05.2008.

Language: English

Level: College/University

Literature: 6 units

References: Not used

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Table of contents

Nr.	Chapter	Page.
1.	Introduction to Aircraft Hydraulics	3
1.1.	Aircraft Hydraulics Definition	3
1.2.	What is a hydraulic system?	3
1.3.	Pascal’s Theory	4
1.4.	Advantages of Hydraulic Systems	4
1.5.	Some Devices Operated by Hydraulic Systems in Aircraft	5
2.	Hydraulics Systems Principles of Operation	6
2.1.	Hydraulic Pressure Regulated Power System	6
2.2.	Functions of Parts of the Power System	8
2.3.	Aircraft Hydraulic System Reservoir	8
2.3.1.	Functions of the Reservoir	8
2.3.2.	Construction of Reservoir	9
2.3.3.	Cavitation	9
3.	Aircraft Hydraulic System Power Pump	11
4.	Hydraulic System Check Valves	12
4.1.	Pressure Control	12
	Principle of Operation (see Fig. 4.2.)	12
4.2.	Circuits Using Pressuring Limiting Devices (PLDs)	13
5.	Hydraulics System Accumulators	14
5.1.	Uses of an Accumulator	14
6.	Hydraulic System Hand Pumps	15
7.	Flow Control	15
7.1.	Selector Valves	15
7.1.1.	Rotary types	15
7.1.2.	Piston Type	16
7.2.	Types of Actuation Cylinders	17
7.2.1.	Single Piston, Single Rod	17
7.2.2.	Single Piston, Double Rod	17
7.2.3.	Rotary Motion Actuating Cylinder	17
8.	Automatic Hydraulic Transmissions	18
9.	Boeing 737 onboard hydraulic control panels	21
10.	Improvements in hydraulic systems	26
	Bi-Directional Hydraulic-Electrical Power Conversion	26
11.	Accidents	28
12.	Kopsavilkums/Аннотация/Annotation	29
13.	Literature	31

Extract

What is a hydraulic system?
It is a system where liquid under pressure is used to transmit this energy. Hydraulic systems take
engine power and convert it to hydraulic power by Fig.1.1
means of a hydraulic pump. This power can be distributed throughout the airplane by means of tubing that runs through the aircraft. Hydraulic power may be reconverted to mechanical power by means of an actuating cylinder, or turbine (see Fig. 1.1.).
The rate of flow of the oil through the system into the actuating cylinder will determine the speed with which the piston rod in the actuating cylinder extends or retracts. When the cylinder is installed on the aircraft, it is already filled with oil. This insures that no air bubbles are introduced into the hydraulic system, which can adversely affect the operation of the system.…

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