Experimental and numerical modal analysis of a passenger vehicle

Oktav, Akın

doi:10.1504/ijvnv.2016.081824

Cited by 9 publications

(7 citation statements)

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“…Computational model of the test vehicle is constructed using Altair/Hypermesh™ package [27]. Optimum sensor locations for the EMA study are determined using the modal analysis results of the computational model.…”

Section: Case Study: Experimental Modal Analysis Of a Test Vehiclementioning

confidence: 99%

“…7. These driving points are determined after many attempts, where results are monitored with respect to the following criteria [27]:…”

Section: Case Study: Experimental Modal Analysis Of a Test Vehiclementioning

confidence: 99%

“…Experimental modal analysis parameters used during the measurements are given in Table 3. For more information about alternative measurement schemes the reader is referred to [27].…”

Section: Case Study: Experimental Modal Analysis Of a Test Vehiclementioning

confidence: 99%

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Identification of non-proportional structural damping using experimental modal analysis data

Oktav¹

2020

J. meas. eng.

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A verified computational model of a complex structure is crucial for reliable vibro-acoustic simulations. Mass and stiffness matrices of such a computational model may be constructed correctly, provided all the design information is available. Since it is an unknown, the damping matrix is usually populated through mathematical models based on some assumptions. In the current study, it is proposed to use the identified non-proportional structural damping matrix in the computational model. Structural damping matrix can be identified using the complex frequency response functions obtained from experimental modal analysis data. No matter what type of a damping mechanism a structure has; proportional or non-proportional, the frequency response functions of the system can be measured. First, the calculation procedure for the non-proportional structural damping matrix is explained. The damping matrix of an analytical model is identified successfully using the proposed procedure. The same procedure is then applied through a case study. Computational model of a test vehicle is constructed. Next, the test vehicle is subjected to a modal test to measure the frequency response functions of the structure. Incompleteness of the measured data and the requirements of the procedure are discussed, as well. The described procedure can be used in any model updating framework.

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Section: Case Study: Experimental Modal Analysis Of a Test Vehiclementioning

confidence: 99%

“…7. These driving points are determined after many attempts, where results are monitored with respect to the following criteria [27]:…”

Section: Case Study: Experimental Modal Analysis Of a Test Vehiclementioning

confidence: 99%

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Identification of non-proportional structural damping using experimental modal analysis data

Oktav¹

2020

J. meas. eng.

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“…As Figure 1 shows, the vehicle BIW was mounted onto four airbags to achieve a free boundary condition. 18,19 The air pressure of the airbags was adjusted so that the rigid resonant frequencies (the resonances on the airbags) of the BIW were below 3 Hz. Because the rigid resonant frequencies were far below the structural resonant frequencies, the effects of the airbags on the structural modes were negligible.…”

Section: Case Studymentioning

confidence: 99%

The Concept modeling method: An approach to optimize the structural dynamics of a vehicle body

Fard

Yao

Taube³

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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Although the concept modeling method has already been proposed in the literature, there is still very limited knowledge about the validation and the application of this method for vehicle body design. This paper substantially increases this limited knowledge by developing a concept model for predicting and optimizing the structural dynamics of a vehicle body-in-white and validating this concept model against a detailed finite element model. The geometry and parameters of the concept model are extracted from its detailed finite element model. The major members and panels of the detailed finite element model are replaced by their equivalent beam and shell elements models. The joints of the concept model are represented by stiffness and mass matrices extracted from the detailed finite element model using the Guyan Reduction Method. The developed concept model is validated by comparing its structural dynamics, including the resonant frequencies and the vibration mode shapes, with the original detailed finite element model and the experimental results. The simplicity and small size of the concept model enable it to easily enhance the structural dynamics of the body-in-white by optimizing the cross-sections of the load-carrying members of the structure. The optimization in this case increased the resonant frequencies of the body-in-white while reducing the total mass by about 6 kg. The results prove that the concept modeling method can significantly enhance the body-in-white structural dynamics by reducing the complexity of the model and allowing the focus for the optimization to be on the main members of the structure at the development stage when the final design parameters are not well known and have not been fixed.

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“…Therefore, the modal parameters can be determined using an analytical/numerical method or an experimental approach (6). For this purpose, a simplified model can be designed taking into account the several degrees of freedom (DOF) in a vehicle (3,7).…”

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confidence: 99%

Dynamic Modal Analysis of a Passenger Bus: Theoretical and Numerical Studies

Lopes

Farahani

Melo

et al. 2021

Transportation Research Record: Journal of the Transportation R

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The dynamic assessment of a passenger bus is of the highest importance when aiming at high safety standards and low emissions for environmental sustainability. This work studies the dynamic response of a bus considering its modal analysis, for which simple dynamic models were developed for fast determination of the lowest frequencies, mainly arising from the suspension flexibility. In addition, complex natural vibration modes, impossible to determine using simplified models, were calculated via finite element method (FEM) modeling. To study the tire elastic behavior, as the key link between the vehicle and the road, specific deformation models, leading to a stiffness matrix to be combined with that of the vehicle spring suspension at each wheel/axis, were developed. This study aims at proposing a set of mathematical formulations to describe the modal behavior of passenger buses in detail, which could be applicable in any other long vehicle with similar conditions. Two main factors are studied, namely the suspension and the tire deformation effect. An acceptable agreement was verified between the simplified approach and FEM model results for the evaluation of natural frequencies and associated modes.

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Experimental and numerical modal analysis of a passenger vehicle

Cited by 9 publications

References 0 publications

Identification of non-proportional structural damping using experimental modal analysis data

Identification of non-proportional structural damping using experimental modal analysis data

The Concept modeling method: An approach to optimize the structural dynamics of a vehicle body

Dynamic Modal Analysis of a Passenger Bus: Theoretical and Numerical Studies

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