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OS-4100・DS-5000 Loss Coefficient Calculation Tool
OT-0450

According to the calculation formula described in JIS K7391, the loss factor and Young's modulus (longitudinal elastic modulus) of the damping material can be calculated from the measurement results of the multilayer test specimen.

The loss factor is one of the indicators of vibration damping performance used in the fields of mechanical vibration and polymer materials. Damping materials with a high loss factor are used by being attached to the surfaces of structures for the purpose of reducing vibrations and radiated sound. This tool calculates the loss factor and Young's modulus of the damping material alone from the frequency response function of a multi-layer test specimen (a specimen with damping material attached to a substrate) measured using the frequency response measurement software OS-4100, thereby clarifying the vibration damping performance of the damping material.

Features

Corresponding to the cantilever beam method (fixed-end steady-state vibration method) and the central support method (central support steady-state vibration method).

It corresponds to both methods of JIS K7391. These are techniques for determining the loss factor using the half-width method from the peaks of the frequency response functions (mechanical impedance (force/vibration velocity) and mobility (vibration velocity/force)) obtained by forcibly vibrating rectangular test specimens.

Compatible with three-layer test specimens (sandwich type, double-sided adhesive type).

It is possible to calculate the loss coefficient and Young's modulus of vibration-damping materials in test specimens that sandwich the materials on both sides, similar to vibration-damping steel plates, as well as in specimens where the materials are adhered to both sides of the substrate.

Aggregate and display the results of different temperature conditions in one graph.

Vibration-damping materials generally have not only frequency characteristics but also temperature characteristics. By using a constant temperature bath for temperature testing, results measured at multiple temperatures can be overlaid.

System Configurations

Cantilever Beam Loss Coefficient Measurement System

This is a method for measuring the loss coefficient by fixing one end of the specimen, exciting bending vibrations at the free end.

system configuration

  • system configuration
    (The graph in the upper right corner is an image of the measured frequency response function.)

Test specimen image diagram

  • Examples of test specimens for the cantilever beam method (left: two-layer specimen, right: three-layer [sandwich type] specimen)
    Examples of test specimens for the cantilever beam method (left: two-layer specimen, right: three-layer [sandwich type] specimen)
Frequency Response Measurement Software OS-4100

The frequency response measurement software is a specialized tool that can measure the frequency characteristics of various objects, including the vibration characteristics of mechanical structures, the acoustic characteristics of speakers, motor control characteristics, servo analysis, coupling response characteristics, and battery impedance characteristics.

　
Frequency response measurement software OS-4100 (Servo Analyzer / Frequency Characteristic Analyzer) is here.

Central Vibration Method Loss Coefficient Measurement System

This is a method for measuring the loss coefficient by supporting the center of a specimen with both ends free and exciting it to induce bending vibrations.

system configuration

  • (The graph in the upper right corner is an image of the measured frequency response function.)
    (The graph in the upper right corner is an image of the measured frequency response function.)

Test specimen image diagram

  • Examples of test specimens used in the central vibration method (left: two-layer specimen, right: three-layer [sandwich type] specimen)
    Examples of test specimens used in the central vibration method (left: two-layer specimen, right: three-layer [sandwich type] specimen)
Frequency Response Measurement Software OS-4100

The frequency response measurement software is a specialized tool that can measure the frequency characteristics of various objects, including the vibration characteristics of mechanical structures, the acoustic characteristics of speakers, motor control characteristics, servo analysis, coupling response characteristics, and battery impedance characteristics.

　
Frequency response measurement software OS-4100 (Servo Analyzer / Frequency Characteristic Analyzer) is here.

Case Studies

This is the result of measuring a two-layer test specimen with damping material attached to an iron base material using the central excitation method.

Frequency response function measurement result screen on OS-4100

  • Frequency response function measurement result screen on OS-4100

Input measurement conditions in OT-0450

  • Input measurement conditions in OT-0450

calculated result

It is possible to calculate not only the loss coefficient and Young's modulus derived from the peak of the frequency response function but also the loss coefficient and Young's modulus at specific frequencies.

loss coefficient

  • Left: Frequency-loss coefficient graph, Right: Temperature-loss coefficient graph
    Left: Frequency-loss coefficient graph, Right: Temperature-loss coefficient graph

Young's modulus

  • Left: Frequency-Young's modulus graph, Right: Temperature-Young's modulus graph
    Left: Frequency-Young's modulus graph, Right: Temperature-Young's modulus graph

Specifications

file format

import file format CSV (data from the damping ratio list output by the OS-4100)
export file format XLSX (report file)

related standards

  • JIS K7391:2008 Test Method for Vibration Damping Characteristics of Non-Restrained Composite Beams

  • JIS G0602:1993 Test Methods for Vibration Damping Characteristics of Damping Steel Plates

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Last updated: July 10, 2024