Dinámica estructural

Динамика конструкций

Operating deflection shapes (ODS) analysis is a very versatile application for determining the vibration patterns of machinery and structures under various operating conditions. The vibration patterns are shown as animated geometric models of the structure that display a combination of the forcing function acting on the structure and the dynamic properties of the structure.

The forcing function depends on the operating conditions, which for machinery, can be influenced by factors such as engine speed, load, pressure, temperature and flow. For civil engineering structures, ambient forces from wind, waves and traffic might also apply.
ODS analysis can be divided into three types – time ODS, spectral ODS and run-up/down ODS.

Brüel & Kjær’s scalable ODS systems provide complete guidance through the set-up, measurement, validation and animation for each ODS type, and allow analysis in real time or during post-processing of time histories.

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Operating deflection shapes analysis system overview

Operating Deflection Shapes Test Consultant™ (ODSTC) integrates the PULSE multi-analyzer platform into a streamlined and complete testing solution, which also includes transducers and accessories.

In classical modal analysis, a model of a structure’s dynamic behaviour is obtained by exciting the structure with measurable forces and determining the response/excitation ratio.

Classical modal analysis ranges from simple mobility tests with impact hammers to multi-shaker testing of large structures. The results are used in a vast range of applications including troubleshooting and diagnostics, benchmarking, simulation studies and design optimization.

Our 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 are also expandable so they can grow with your requirements.

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Classical modal analysis system overview

Our classical modal analysis 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 measurement, analysis and correlation. 

In operational modal analysis (OMA), only the output of a structure is measured using the ambient and operating forces as unmeasured input. OMA is used instead of classical modal analysis for accurate modal identification under actual operating conditions, and in situations where it is difficult or impossible to artificially excite the structure. Many civil engineering and mechanical structures are difficult to excite artificially due to their physical size, shape or location. Civil engineering structures are also loaded by ambient forces such as the waves against offshore structures, the wind on buildings, and traffic on bridges, while mechanical structures such as aircraft, vehicles, ships and machinery exhibit self-generated vibrations during operation. In OMA, these forces, which would produce erroneous results in classical modal analysis, are instead harnessed as input forces. As OMA can be performed in situ during normal operation, set-up time is reduced and downtime can be eliminated.

System suggestion

Operational modal analysis system overview

For an integrated, easy-to-use modal test and analysis system, use BK Connect™ Structural Measurements – Hammer and Shaker for geometry-driven data acquisition, and then transfer data to PULSE Operational Modal Analysis software for analysis and validation. To achieve the optimal solution you can select from Brüel & Kjær’s complete measurement chain including accelerometers, impact hammers, force transducers, modal exciter systems, LAN-XI data acquisition hardware and measurement and post-processing software. 

Virtual simulation has dramatically accelerated the overall aircraft development process. However, physical testing remains a critical contributor to model validation and to providing the understanding of structural characteristics of new materials and manufacturing processes. Aircraft ground vibration testing (GVT) is an economic method for determining the modal parameters and mode shapes of a structure and is typically performed very late in the development process. The outcome is used to update the aircraft’s analytical model and to predict the critical flutter speed. This is then used as input for the aircraft flutter test to obtain its airworthiness certification and to detect structural flaws and troubleshoot flight control dynamic problems.

GVT is mandatory for new aircraft and for existing aircraft that undergo modifications.

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Ground vibration testing system overview

A typical GVT system consists of shakers for excitation, accelerometers designed for structural analysis and LAN-XI data acquisition hardware. Post processing is carried out with PULSE Reflex Modal Analysis software. Based on a Finite Element (FE) model of the test object, the test model geometry is defined. The FE model also provides the basis for a pre-test analysis to define excitation and response DOFs (Degree-Of-Freedoms) and target modes.

This system is scalable, depending on the size of the test object, and especially for large objects, the LAN-XI data acquisition hardware can be distributed, to minimise cabling.

Integration of test and finite element analysis (FEA) is a core discipline in structural analysis. Integrating testing and FEA helps to cut development costs, reduces the amount of physical prototypes, and shortens the time from concept to production – all by optimizing strategies for testing structures and improving the development of finite element (FE) models. Using baseline FE models, you can optimize your structural tests early in a project and then improve these FE models using the enhanced test results.

PULSE Reflex offers powerful tools to gain better confidence in the test and simulation results and to improve essential engineering judgement skills, benefitting test engineers, analysts and management.

System suggestion

Test-FEA integration system overview

PULSE Reflex offers one platform for structural measurements to FE model correlation.

FE models can be imported from leading FEA programs like Nastran® (MSC, NX, NEi), ANSYS® and ABAQUS® into PULSE Reflex Modal Analysis for performing test planning (pretest analysis) and validation.

PULSE Reflex Correlation Analysis lets you perform complete correlation analysis of two modal models to identify shortcomings in modal tests and any areas of insufficient modelling quality in FE models.

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