Operational Modal Analysis, also known as Output Only Modal Analysis, has for several years been used for extracting modal parameters of mechanical structures. In this paper, an overview of the Frequency Domain Decomposition (FDD) technique and the Stochastic Subspace Identification (SSI) technique is given. Use of the recently developed projection channel technique in combination with the SSI ...

the ambient vibration measurement is a kind of output data-only dynamic testing where the traffics and winds are used as agents responsible for natural or environmental excitation. therefore an experimental modal analysis procedure for ambient vibration testing needs to base itself on output-only data. the modal analysis involving output-only measurements present a challenge that requires the u...

In this paper, it is described that acoustic intensity of a rail load machine was measured for decreasing the operating noise. To locate exactly the noise sources on the machine, Operational modal measurement and analysis was performed. Comparing the results of analysis the both sets of data measured, the main components of emission noise were determined. Further, improving design of the machin...

Modal analysis techniques are considered as the most used of allowing characterization dynamic behaviour in systems such planetary gear transmission. During operational conditions, modal can be altered. The main purpose this paper is to estimate Properties (MP) two-stage during non-stationary regimes using a further version Operational Analysis (OMA). natural frequencies and damping determined ...

All structures have modal properties such as natural frequencies and damping. In engineering it is often of interest to estimate these modal properties for certain structures, to be used when modelling for example fatigue. This is done by computing them from nite element models, by using experimental measurements or both. In the case of doing both, a nite element model is usually established rs...

in this paper the interior noise level of a vehicle due to structural vibration, named structure borne noise, as a part of nvh analysis has been investigated. first structural analysis is performed and vibrational behavior of structure carried out due to power plant excitations. then interior acoustic cavity response for such excitation and resultant noise is determined. vibrational analysis is...