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Classical Modal Analysis

Classical modal analysis is used for modal parameter identification of structures under controlled boundary and environmental conditions using hammer or shaker excitation.

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DCTA Shaker 2 - Photo Courtesy of DCTA IAE

In Classical Modal Analysis, a model of a structure’s dynamic properties consisting of the modal parameters (natural frequencies, damping ratios and mode shapes) is obtained by exciting the structure with measurable forces and determining the response/excitation ratio.

Classical Modal Analysis ranges from simple mobility tests with a roving impact hammer and a fixed accelerometer to multi-shaker testing of large structures using hundreds of accelerometers. It is used in a vast range of tests including design verification and optimization, certification testing, troubleshooting and benchmarking.

System Suggestion

Classical modal analysis system overview


Our classical modal analysis solutions guide you through the complete set-up, measurement and analysis in simple and intuitive steps, and provide you with accurate and reliable results even in the most demanding situations, with a targeted set of best-in-class modal parameter estimators and validation tools.

Our solutions cover the entire measurement and analysis chain including accelerometers and force transducers, impact hammers, modal exciter systems, LAN-XI data acquisition hardware and BK Connect® software for pre-test analysis, measurement, analysis and Finite Element model correlation. Our solutions are also expandable so they can grow with your requirements. 

Video: Brüel & Kjær Stepped Sine

Recorded webinar: Modal Analysis using Hammer or Shaker Excitation

Related Information

BK CONNECT TYPE 8491-A

Hammer Impact Applet

The Hammer Impact is a point BK Connect Applet containing all functionality required to calculate accelerance, mobility and compliance FRFs using impact hammer measurements

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BK CONNECT TYPE 8411

Structural Measurements – Hammer and Shaker

Intuitive software for geometry-guided real-time hammer and shaker measurements used for classical modal analysis.

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TYPE 8412 | BK CONNECT 

Advanced Sine Measurement Software

Advanced Sine Software for real-time measurements of frequency response functions (FRFs) using stepped sine excitation for linearity studies and classical modal analysis.

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BK CONNECT TYPE 8420

Modal Analysis Software

Provides powerful tools for creating geometries and a comprehensive set of analysis and validation tools for single-reference modal analysis.

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BK CONNECT TYPE 8420-A

Advanced Modal Analysis

Advanced Modal Analysis software for creating geometries and a comprehensive set of analysis and validation tools for polyreference modal analysis.

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BK CONNECT TYPE 8421

Correlation Analysis Software

Correlation Analysis Software for correlating two modal models, typically consisting of a finite element model and a test model.

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TYPE 4507-B

Piezoelectric CCLD Accelerometer, TEDS, 1 mV/g, Side Connector, 1 Slot, Excl. Cable

Designed for modal analysis measurements.

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TYPE 4524

Triaxial CCLD Piezoelectric Accelerometer

Lightweight, triaxial piezoelectric OrthoShear accelerometers, each with three independent outputs for simultaneous measurements. Ideally suited for structural analysis measurements.

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