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Installation and Operating Manual
Model 088A ICP
®
Modal Punch
Manual Number 19199
Manual Revision: NR
Contents:
1.0 Introduction
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Page 1
2.0 Description ................................
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. Page 2
3.0 Installation ...............................................
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... Page 2
4.0 Operation .........................................
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.
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.. Page 3
5.0 Testing
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Page 4
6.0 Calibration
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... Page 5
7.0 Maintenance
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Page 6
8.0 Cautions
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.. Page 6
9.0 Customer Service
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Page 7
1.0 INTRODUCTION
The PCB
®
Modal Punch is ideally suited for structural behavior testing. The Modal
Punch allows the user to reach impact locations previously inaccessible by conventional
impulse hammers. Impulse testing the dynamic behavior of mechanical structures
involves positioning the Modal Punch at the desired measurement location on the
structure, then striking the force-instrumented Modal Punch with a standard non-
instrumented hammer and measuring the resultant motion with an accelerometer(s).
Integration of the acceleration signal yields velocity or displacement data for use in
computing classical transfer characteristics such as inertance, compliance, impedance,
and mobility. Structures generally respond as (1) rigid or elastic bodies, (2) finite
elements, lumped constant models, and (3) distributed parameter models conducting
stress-strain (sound) waves.
The impulse generated by the Modal Punch and the user
’
s standard non-instrumented
hammer consists of a nearly-constant force over a broad frequency range and is therefore
capable of exciting all resonances in that range. The physical properties of the impact
device, including size, weight, material, and velocity at impact determine the amplitude
and frequency content (wave shape) of the force impulse. The impact cap material
generally determines the frequency content. The mass of the Modal Punch and hammer,
along with the velocity at impact, determine the energy content.
Содержание 088A
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