Topic
Modal testing
About: Modal testing is a research topic. Over the lifetime, 4047 publications have been published within this topic receiving 64772 citations.
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TL;DR: In this article, the use of piezoceramic transducers, lead Zirconia Titanate (PZT) actuators and Polyvinylidene Fluoride (PVDF) sensors, for experimental modal testing of a simply supported plate is presented.
Abstract: This paper presents the use of piezoceramic transducers, Lead Zirconia Titanate (PZT) actuators and Polyvinylidene Fluoride (PVDF) sensors, for experimental modal testing of a simply supported plate. A series of rectangular-shaped PVDF films are evenly distributed over the plate and act as the sensing devices instead of traditional acceleration sensors. Pairs of rectangular PZT patches are bounded to opposite sides of the plate to form actuators and when they are excited by 180° out-of-phase stimulation, they will cause pure bending. The theoretical formulation of frequency response functions (FRFs) of the piezoceramic transducers is developed. The mode shape functions of the PZT actuator and the PVDF sensor are identified, respectively. Experiments are performed to obtain a column of FRF matrix. The structural modal parameters, including natural frequencies, modal damping ratios and mode shapes, can then be extracted by a modal parameter extraction method. Results show the modal parameters can be properly obtained and physically interpreted. This paper presents the concepts of smart structural testing (SST) with the use of piezoceramic transducers and leads to the applications of smart structures to health monitoring of structural systems.
26 citations
TL;DR: In this paper, the authors present results of modal testing of a unique full-scale 15×15 m floor structure made of in situ cast high-strength concrete (HSC) having strength of at least 115 MPa.
Abstract: This paper presents results of modal testing of a unique full-scale 15×15 m floor structure made of in situ cast high-strength concrete (HSC) having strength of at least 115 MPa. In addition, finite element (FE) modelling of this floor, model correlation with experimental results and subsequent ‘manual’ model updating to match correlated pairs of natural frequencies and mode shapes are described. As the concrete floor was tested and updated for both uncracked and uncracked states, the FE model updating provided a valuable insight in the change of floor stiffness between the uncracked and cracked states. It was found that even a heavily cracked HSC floor remains linear and does not have significantly increased damping under low-level excitation. Also, bending of in situ cast HSC columns provided considerable stiffness to the floor even when heavily and visibly cracked. Finally, FE model updating confirmed that dynamic modulus of elasticity of the as-built HSC was about 47 GPa and, therefore, considerably increased compared with normal strength concrete.
26 citations
TL;DR: In this article, the state space method makes use of the singular value decomposition (SVD) to form a well-conditioned data matrix and obtains the modal parameters through eigendecomposition of the data matrix.
26 citations
TL;DR: In this paper, the equations to compute the modal parameters from the state space model when input and output data are available (like in combined experimental-operational modal analysis) are derived in detail using invariants of the state-space model.
26 citations
01 Jan 2005
TL;DR: Experimental modal testing is used in this paper to solve problems in railway engineering such as estimating dynamic properties of structural components, and has proven to be an effective and nondestructive test method for estimation of the dynamic stiffness and damping constant of the railway track component.
Abstract: Experimental modal testing is used in relation to solving problems in railway engineering such as estimating dynamic properties of structural components. Modal testing has proven to be an effective and non-destructive test method for estimation of the dynamic stiffness and damping constant of the railway track component.
26 citations