lecture 3 mechatronics

8/13/2019 Lecture 3 Mechatronics

1/23

Chap.4-Mech.Actuator

Chap4. Mechanical Actuator Systems

1-the usefulness of hydraulic and pneumatic systems as

mechatronics elements.

2- the usefulness of mechanical elements such as mechanisms,gears, cams, etc.

3- questions and problems.


2/23


- Hydraulic and pneumatic systems are similar

except that:

- Hydraulic system uses an incompressible fluid as

the working medium,

- a pneumatic system uses air, which is basicallycompressed.


3/23


Advantages of using air as a working medium:

1- Readily available and no recycling is

necessary2- It is non-flammable so leakage does not create

threat to safety

3- It has negligible change in viscosity, whichcontrols the systems performance


4/23


Advantages of using incompressible fluid a working

medium:

1- the incompressibility of fluid helps in positive

action of motion.

2- faster response (unlike pneumatic system

where there are longer time delays)


5/23


Symbols for hydraulic and pneumatic systems:

- Symbols are invaluable to designers in

representing complex fluid power systems.

- The standard ANSI (American National Standard

Institute) are used.


6/23


7/23


ANSI symbols

for hydraulic

and

pneumaticsystems


8/23


the major components of hydraulic and pneumatic

systems are:

- Pumps

- Compressors

- valves


9/23


pumps are used to supply the high pressure that the

mechatronic systems require.

Three types are most commonly used:

1- gear pump

2- vane pump3- piston pump


10/23


1- gear pump


11/23


1- vane pump


12/23


1- piston pump


13/23


Selection of different types of pumps:

1- rotary gear pumps are comparatively less costly

and work under pressures up to

2- units designed to work under pressure up to

are also available.

3- Their efficiency is lower than other types.

2750kN/m

22000kN/m


14/23



1- vane pumps are usually costlier.

2- greater efficiency than gear pumps.

3- their max. pressure is limited to2750kN/m


15/23



1- rotary piston pumps are usually costlier and more

efficient than other types.

2- they can operate up to 27000kN/m


16/23


Two types of compressors are most commonly used:

1- centrifugal compressor

2- axial compressor


17/23


1- centrifugal compressor


18/23


1- axial compressor


19/23


- The valves are used to control the direction and

amount of flow in hydraulic or pneumatic system.- Several types are commonly used:

1- relief valve

2- differential pressure regulating valve


20/23


1- relief valve

Limit the max.

obtainable pressure


21/23


2- differential pressure regulating valve

Maintain p=(P1-P2)=const.


22/23


1. Title of the project

2. Introduction

1. Definition of the project2. Background

3. Literature review

4. Problem & solution3. Description of the project

4. Staff requirements

5. Equipments required6. Budget required

7. Duration and Time schedule


23/23


lecture 3 mechatronics

Documents