This series of Impact Hammers has been designed to excite and measure impact forces on small to medium structures such as engine blocks, car frames and automotive components. An accelerometer (or laser velocity transducer) is used to measure the response of the structure. By using a multichannel FFT analyzer, such as the PULSEâ„¢ system, the frequency response function and mode shapes of the test structure can then be derived. Contrary to using an electrodynamic exciter, an impact hammer does not apply additional mass loading to the test object and it provides a very portable solution for excitation.

Uses

* Impact-force measurements on small to medium structures
* Measurement of frequency response functions using impact excitation techniques
* As part of a dynamic structural testing system for modal analysis and the prediction of structural response

Features

* Four types with sensitivity from 1 to 22 mV/N
* Ergonomic handle
* Negligible changes to dynamic properties of test structure
* Three replaceable tips
* Acceleration compensated

Characteristics

The Type 8206 series feature built-in electronics and the output sensitivity is expressed in terms of voltage per unit force (mV/N or mV/lbf). The hammers also have built-in acceleration compensation that removes unwanted noise from the resonance of the hammer from the output signal. This results in a clean, smooth output signal representing the excitation in both amplitude and phase.

The impact hammer is supplied with three interchangeable impact tips of aluminium, plastic and rubber. The choice of impact tip determines the impulse shape (amplitude and duration) and the bandwidth of the excitation.

For increased head mass, a 40 gram head extender is available.

The handle has been ergonomically designed for optimal control of impact, thus reducing the risk of ®double hits”.
Calibration

The transducer is supplied with an individual calibration of the sensitivity.

Brüel & Kjær Sound & Vibration Measurement A/S

Skodsborgvej 307
DK-2850 Nærum
Denmark

Phone: +45 7741 2000
Fax: +45 4580 1405

Tags : Impact, sensitivity, series, structure, transducer

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