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Everett Bailey
Everett Bailey

Vibration Analysis And Structural Dynamics For ...



A framework for free vibration analysis of plate-like structures is presented in the paper. Based on the previously formulated dynamic stiffness elements, FREEVIB object-oriented software in Python environment has been created. Software design and structure as well as a wide range of possible structural problems that could be analyzed using the FREEVIB are presented. Through several illustrative examples including free vibration analysis of stepped, stiffened and folded plate structures, implying isotropic or orthotropic material formulations, the efficiency and accuracy of the FREEVIB is demonstrated. The possibilities of further extensions and improvements of the software are discussed.




Vibration Analysis and Structural Dynamics for ...


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Composite laminates have attracted great attention over past decades in a wide range of engineering fields where they are applied as structural components of aircrafts, space structures, highway and pedestrian bridges and platforms amongst others, due to its high stiffness-to-weight ratio and high fatigue and environmental resistance. Consequently, vibration and buckling analysis of such structures has become a great concern for researchers.


The core of the DSM is the frequency domain-based strong-form solution of the governing equations of motion derived for the corresponding elastodynamic problem. Therefore, the number of dynamic stiffness elements necessary for structural discretization is frequency independent and influenced only by the change in the geometrical and/or material properties of the structure. At the same time, using simple assembly procedure as in the FEM makes the DSM an efficient and highly accurate method capable of solving a broad variety of vibration problems.


Problems arising from finding the closed-form solution for the most general case, regardless of the boundary conditions, have been overcome in the works of Casimir et al. [17] and Banerjee et al. [18, 19] who formulated the dynamic stiffness matrix of rectangular isotropic plate element undergoing transverse vibration based on CPT. Based on the classical laminated plate theory (CLPT), the dynamic stiffness matrix for an orthotropic plate element has been formulated recently by Ghorbel et al. [20, 21], Liu and Banerjee [22, 23], Liu et al. [24], and Papkov and Banerjee [25]. The spectral dynamic stiffness formulation for in-plane modal analysis of composite plates and prismatic solids was developed by Liu [26]. In a series of contributions, dynamic stiffness matrices for a completely free rectangular plate element based on the FSDT [27] and higher-order shear deformation theory (HSDT) [28], as well as for the plate element ongoing in-plane vibrations [29], have been developed by the authors. Recently, the above formulations have been broadened to the free transverse vibration analysis of sandwich [30], symmetric cross-ply laminated composite plates [31, 32], and composite stiffened plate assemblies and GFRP beams with or without straight through cracks [33].


Combine modal testing and analysis tools to validate your 3D simulation models, perform vibration response calculations, or complete a root cause and damage detection analysis. Our solutions integrate over 40 years of engineering experience to help you easily perform a full experimental modal analysis.


Use digital image correlation (DIC) for full-field vibration testing when interested in detailed local response, when faced with challenging test conditions such as rotating equipment or high temperate surfaces, or to avoid mass-loading on light weight structures. Feed our experimental and operational modal analysis software with 3D full-field strain or vibration data and capture the entire mode shape and exact peak locations. Or, combine traditional accelerometer-based modal testing with digital image correlation to obtain both global behavior and a very detailed representation of a smaller section at an unparalleled spatial resolution.


Obtaining accurate FRF is the starting point of trustworthy noise, vibration, and harshness (NVH) testing and analysis, in any situation such as performing a modal analysis, troubleshooting vibration issues or running a transfer path analysis. Rely on our dedicated solutions for impact hammer and shaker testing, as well as on our wide selection of excitation profiles to execute your testing scenarios and obtain top-quality data quickly and efficiently.


Streamline your process of analyzing and solving vibration issues. Simcenter testing solutions help you quickly pinpoint the root causes of vibration issues and offer powerful analysis tools to remedy structural weaknesses. From basic tools to advanced solutions, our Simcenter offering is always adapted to your needs.


Structural dynamics is a type of structural analysis which covers the behavior of a structure subjected to dynamic (actions having high acceleration) loading. Dynamic loads include people, wind, waves, traffic, earthquakes, and blasts. Any structure can be subjected to dynamic loading. Dynamic analysis can be used to find dynamic displacements, time history, and modal analysis.


Mechanical vibrations occur throughout nature and in our daily lives. They affect the safety, durability and usability of structures. Vibration analysis and vibration optimization are therefore of high technical importance. There are more and more challenges related to vibrations including:


Evaluate or optimize your measurement data from vibration tests using the signal processing and operational deflection shape analysis (ODS) methods. In this software package, a variety of possible views are available for visualizing your measurement. At the same time, the data can be processed and the result analyzed as a mode shape on the geometry.


A unique combination of experimental modal analysis, operational modal analysis and numerical modal analysis (i.e. finite element simulation) is provided to determine the modal characteristics. The results of the vibration simulation can be compared with those of the vibration measurements and the simulation model can be adapted to the actual operating condition. All this is done with a single software.


For the analysis and visualization of rotating machines: The order analysis in WaveImage allows a unique visualization of the vibrations depending on order or speed directly on the structure. State-of-the-art algorithms and a variety of visualizations are available. By using RPM Track, RPM signals can be reconstructed retrospectively from the vibration measurement.


The structural dynamics software WaveImage is the tool of choice for getting started with vibration analysis. Even without expert knowledge we make you understand the complex context of vibrations in an easy way.


High resolution textured animations on complex geometries from 3D scans or super intuitive photo geometries, the structural dynamics software WaveImage puts its focus on visualizing complex contexts in an easy way.


In addition to a wide range of options to analyze structural dynamics, we also offer the necessary measurement technology. From the first smart impulse hammer WaveHitMAX for structural excitation, as well as data acquisition of the structural response or operating vibrations. Data is acquired using high speed camera footage with WaveCam or with the mobile data recorder gt-432. Connect more than 100 synced sensors (e. g. accelerometers, microphones, rotational speed).


The impact hammer WaveHitMAX is the tool of choice when it comes to vibration excitation. It should be part of every vibration test equipment. The first smart impact hammer provides new possibilities of mechanical excitation for structural dynamic applications.


Mobile Data Recorder gt-432 Series for measurement with ICP sensors: Full mobility without compromising in performance. With battery power supply and on device touch screen user interface this new data recorder is suitable for fully mobile but also for stationary structural dynamics measurements.


In my last post I covered 7 programming options for vibration analysis. These offer the greatest analysis flexibility; but sometimes they require an advanced knowledge of the computing language and analysis fundamentals which not everyone has. Standalone graphical user interfaces (GUIs) are nice for providing that initial overview of your data and performing some analysis. 041b061a72


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