SOORAJ VR ROL NO : 25 S6, PE..

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mechatronics

TOPIC

Active vibration control using magnetostrictive transducers

Fiber optic devices in mechatronics

magnetostriction

Magnetostriction is a property of ferromagnetic materials that causes them to change their shape or dimensions during the process of magnetization.

The variation of material's magnetization due to the applied magnetic field changes the magnetostrictive strain until reaching its saturation value, λ.

Magnetostrictive material

Magnetostriction is a property of certain material(nickel,iron,cobalt and respective alloys).

Magnetostrictive materials can convert magnetic energy into kinetic energy, or the reverse, and are used to build actuators and sensors.

Capable to produce strain on the order of 2000ppm.

transducer

Active vibration control using magnetostrictive transducer

Vibration of a structure is reduced by applying counter force to the structure that is appropriate out of phase but equal in force and amplitude to the orginal vibration.

It consist of CONTROL SYSTEM, VIBRATING STRUCTURE, and ACTUATER.

Active vibration control system

Components

Accelerometer: motion sensor

Control: high speed microprocessor based system

Actuator: magnetostrictive type ,piezoelectric material

Type of actuators

Magnetostrictive piezoelectric

Comparatively slow response Fast response

Relatively low magnetic field it can produce more strain

Required very high voltage for micro inch strain

Produce more counter force comparatively less

It have high frequency limitation

It can oscillate well in to megahertz

Highly sensitive

Highly accurate

Structural vibration can be reduced effectively

advantages

Appliation

Isolation of microelectronics and signal processing unit.

Precision manufacturing area

Controlling vibration in cutting tool

Automotive industry

Machine tools…

Magnetotrictive transducer

Basic element of the actuators consist of:

The coil that encloses the magnetostrictive rod.

Magnetic poles that conduct the flux to the rod.

The DC flux from the permanent magnet to rod,

Th air gap that allows the rod to expand and contract freely.

The head and tail mass or the base , and spring system and provided to give proper preload to the rod.

Fiber optic devices in mechatronics

Fiber optic sensing : temperature, pressure measurement.

Light can modulated and transmitted over large distance.

An optical fiber consists of a core, cladding, and a buffer (a protective outer coating), in which the cladding guides the light along the core by using the method of total internal reflection. The core and the cladding (which has a lower-refractive-index) are usually made of high-quality silica glass.

THANK YOU…

SOORAJ VR

ROLL NO : 25

S6, PE