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BRUEL & KJAER 4809 User Manual

BRUEL & KJAER 4809
24 pages
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Instructions
and
Applications
~
Vibration Exciter
Type
4809
The Vibration Exciter Type
4809
is
a permanent magnet type exciter
for
use in accelerometer calibration,
mechanical impedance measurement
or
testing
of
small structures. It
has a force rating of
10 lbf.
(44.5
N)
.
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BRUEL & KJAER 4809 Specifications

General IconGeneral
TypeVibration Exciter
Power SupplyExternal Power Amplifier required
Transverse Sensitivity< 5%
Power AmplifierRequires external amplifier
CoolingAir cooling

Summary

Introduction to Vibration Exciter Type 4809

Description and Operation of Type 4809

Principle of Operation

Explains the electrodynamic force generation principle (F=BIL) in the exciter.

Exciter Construction Details

Sectional drawing and details of the exciter's construction, including coil and magnet.

Replaceable Mechanical Fuse Inserts

Details on mechanical fuse inserts for protecting the moving element and their installation.

Additional Cooling Methods

Provisions for compressed air cooling under heavy load conditions.

Positioning the Exciter for Use

Guidance on operating the exciter in upright or other positions.

Pushrods for Force Transfer

Description and use of pushrods for transferring force and providing protection.

Characteristics of Vibration Exciter 4809

Frequency Response and Resonance Analysis

Plot showing acceleration vs. frequency, detailing suspension and axial resonance peaks.

Rated Force and Operational Limits

Load rating curves defining limits for acceleration, displacement, and force vs. frequency.

Cross-Motion Characteristics for Calibration

Analysis of cross-motion percentage relative to axial motion, critical for calibration.

Applications of the Type 4809 Exciter

Accelerometer Calibration Setup

Diagram for back-to-back calibration using a standard accelerometer.

Mechanical Impedance Measurement Setup

Setup for measuring mechanical impedance by maintaining constant velocity.

Force Controlled Structural Testing

Using a force-controlled loop for structural testing with a force transducer.

Technical Specifications

Rated Force and Dynamic Limits

Specifications for rated force, acceleration, current, displacement, and velocity limits.

Moving Element and Resonance Frequency

Details on moving element weight and unloaded table resonance frequency.

Magnetic Field, Fuse Inserts, and Motion

Specifications for stray magnetic field, mechanical fuse inserts, and cross-motion.

Flexure Stiffness and Dimensions

Specifications on dynamic flexure stiffness and physical dimensions of the exciter.

Weight and Supplied Accessories

Specifies the exciter's weight and lists included accessories like inserts and tools.

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