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Company

LOGO

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Company

LOGO

S.J GOVT.)POLYTECHNIC

BANGALORE

DEPARTMENT OF MECHANICAL ENGINNERING

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UNDER THE GUIDENCE OF OUR

SIR

Our Beloved Venkatesh Murthy sir Surya Pratap Singh

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Company

LOGOluidics and

fluid logics

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CONTENT

1. INTRODUCTION

2. PRINCIPLE

3. ADVANTAGES,DISADVANTAGES

4. FLUIDIC ELEMENTS

5. FLUIDIC DEVICES

6. APPLICATION OF FLUIDICS

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INTRODUCTION

FLUIDICS

It is branch of fluid power engineering

Uses fluid under pressure to control and

transmit power

Various functions performed using fluid

flow phenomenon in components are-

Sensing

Memory

Logical functions

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FLUID LOGICS

The fluidic devices having non moving

fixed parts(elements)

Uses fluid or compressible medium to

perform logical operations similar to

electronics

Also known as non-moving logiccontrollers

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Need for fluidics

Major problem in hydraulics andpneumatics waswear and tear of

mechanical parts

A new type of control elements called fluidlogic elementswas developed

They have minimum number of

mechanical moving parts thus- no wear and tear

more reliable

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Historical background

The entire development of fluidictechnology is based on the wall

at tachment phenomenon

this was first discovered by Henri Coandain 1932

This phenomenon is called as Coanda

effect

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Advantages

REQUIRES LESS SPACE TO MOUNT

NO ACTUATING FORCE IS REQUIREDNO WEAR AND TEAR OF ELEMENTS

QUITE INSENSITIVE TO

TEMPEATURE,DIRT ETC.

MOST RELIABLE UNDER CNDITION SUCHAS SHOCK,VIBRATIONS AND MAGNETIC

INTERFERANCE

SIMPLER IN CONSTRUCTION,SMALL IN

SIZE AND PRODUCTION COST IS LESS

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Disadvantages

NOT SUITABLE FOR HIGH PRESSURE WORKS

NOT SUITABLE FOR INCOMPRESIBLE FLUIDS(LIKE OIL)

GREAT SKILLS ARE REQUIRED FOR THE MANUFACTURINGOF COMPONENTS FOR A SPECIFIC OPERATION

FLUIDIC DEVICES HAVE SLOW SPEEDS AND LOW

PRESSURE OUTPUTS

MAINTENANCE IS DIFFICULT SINCE FLUIDIC SYSTEMS

ARE VERY SMALL IN SIZE

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Fluidic elements

Fluidic elements are the non-moving fixedparts in fluidic devices

Help to perform various logic functions

Fluidic elements are-1 Input 7 Fluid

2 Output 8 Signals(control input)

3 Vents4 Air jet

5 Control jet

6 Reset

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Fluidic devices

TEXT

DIGITAL

FLUIDICDEVICES

ANALOG

FLUIDICDEVICES

Are simple components used in fluidcontrol systems

The signal in the form

output or no output

Ex.- Bi stable flip flop

Fluid logic gates

The signal in the form of

varying output low to highbased on control input

Ex.-Fluidic sensors

Turbulance amplifier

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Fluidic devices

Bi-stable flip flop

AND/NAND gate

OR/NOR gate

FLUID LOGICDEVICS

Interruptible jet sensor

Reflex sensor

Back pressure sensor

FLUIDICSENSORS

Turbulence amplifierFLUIDIC

AMPLIFIERS

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Fluid logic devices

Bi-stable flip flop

CONSTRUCTION

A Y-junction on a solid piece of plate is createdVarious control elements present are-

1. Inlet from the base

2. Outlet at two junctions

3. Control jet from one side or from the other

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OUTPUT2OUTPUT1

CONTROL JET

C2

CONTROL JET

C1

INPUTPRINCIPLE The input fluid move towards either output1 or 2

depending on presence of control jet at control

port

Thus making output alternate or flip-flopas it iscalled

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WORKINGControl jet C1 Control jet C2 Output1 Output2

1 0 0 10 0 0 1

0 1 1 0

0 0 1 0

C2

OUTPUT2OUTPUT1

C1C1 C2

OUTPUT1 OUTPUT2

STABLE

STATES

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Control jet C1 Control jet C2 Output1 Output2

0 0 0 0

1 0 1 1

1 1 0 1

vent

Output1

Output2

C1

C2Inlet

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Progress Diagram

Phase 1 Phase 2 Phase 3

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Applications

Biosensors

Logic

functions

Industrial

automation

Fluidic

actuators

Position

sensing

Monitor

equipment

conditions

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Marketing Diagram

FLUID LOGIC DEVICES

Bi-stable

flip flopTEXTTEXT TEXT

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