Application of Operational Modal Analysis on Cars

Møller, Niels; Gade, Svend

doi:10.4271/2003-01-1599

Cited by 11 publications

(4 citation statements)

References 1 publication

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“…where vect(X) stands for the column-wise vectorization of X, R y m y m is the measured LTV autocorrelation obtained using (6), and R yy is the true LTV model. It is important to emphasize that the ML cost function will only be simplified to the LS cost function when the assumptions on the measurement noise are fulfilled.…”

Section: The Cost Functionmentioning

confidence: 99%

“…Operational measurements proved to be successful in civil engineering, where it is difficult to obtain artificially induced vibration levels that exceed the natural vibrations due to traffic or wind [2][3][4]. It is also a popular approach in various mechanical engineering applications; think of, for instance, the road testing of a vehicle [5][6][7]. These types of measurements are commonly used in aerodynamics; for instance, studying vortex-induced vibration [8,9].…”

Section: Introductionmentioning

confidence: 99%

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A Nonparametric Regularization for Spectrum Estimation of Time-Varying Output-Only Measurements

Csurcsia,

Ajmal,

De Troyer

2024

Vibration

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In this work, an advanced 2D nonparametric correlogram method is presented to cope with output-only measurements of linear (slow) time-varying systems. The proposed method is a novel generalization of the kernel function-based regularization techniques that have been developed for estimating linear time-invariant impulse response functions. In the proposed system identification technique, an estimation method is provided that can estimate the time-varying auto- and cross-correlation function and indirectly, the time-varying auto- and cross-correlation power spectrum estimates based on real-life measurements without measuring the perturbation signals. The (slow) time-varying behavior means that the dynamic of the system changes as a function of time. In this work, a tailored regularization cost function is considered to impose assumptions such as smoothness and stability on the 2D auto- and cross-correlation function resulting in robust and uniquely determined estimates. The proposed method is validated on two examples: a simulation to check the numerical correctness of the method, and a flutter test measurement of a scaled airplane model to illustrate the power of the method on a real-life challenging problem.

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Section: The Cost Functionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Nonparametric Regularization for Spectrum Estimation of Time-Varying Output-Only Measurements

Csurcsia,

Ajmal,

De Troyer

2024

Vibration

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“…Some of the early applications of the operational modal analysis were the determination of the modal parameters of an aircraft in flight [ 24 ], the modal analysis of testing a spacecraft during launch [ 25 ], and the modal testing of engines during launch and shutdown [ 26 ]. Later, the method was used to study the modal parameters of cars [ 27 ]. OMA is one of the most popular methods in the field of civil engineering, which has been applied to bridges, roofs, stone towers, offshore platforms, and high-rise buildings [ 28 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Static Loads Influence on Modal Properties of the Composite Cylindrical Shells with Integrated Sensor Network

Mironov¹,

Kovaļovs

Chate

et al. 2023

Sensors

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This paper presents the results of experimental and numerical studies of the dynamic parameters of composite cylindrical shells loaded under axial tension. Five composite structures were manufactured and loaded up to 4817 N. The static load test was carried out by hanging the load to the lower part of a cylinder. The natural frequencies and mode shapes were measured during testing using a network of 48 piezoelectric sensors that measure the strains of composite shells. The primary modal estimates were calculated with ARTeMIS Modal 7 software using test data. The methods of modal passport, including modal enhancement, were used to improve the accuracy of the primary estimates and reduce the influence of random factors. To estimate the effect of a static load on the modal properties of a composite structure, a numerical calculation and a comparative analysis of experimental and numerical data was carried out. The results of the numerical study confirmed that natural frequency increases with increasing tensile load. The data obtained from experimental results were not fully consistent with the results of numerical analysis, but showed a consistent pattern, repeating for all samples.

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“…The signal was valid when coherent coefficient was above 0.8. 36,37 Collecting signals while processing them can improve the precision and avoid repetitive trials. Coherence in x, y, and z directions was shown in Figures 7-9, respectively.…”

Section: Establishment Of the Test Systemmentioning

confidence: 99%

Modal analysis of a truck cab using the least squares complex exponent test method

Fan

Wang

Zhao

2015

Advances in Mechanical Engineering

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This article introduces the basic theory of modal analysis. The modal testing system is established for a developing truck body. Using a pseudo-random excitation signal along the x, y, and z directions, the modal test is carried out to obtain the dynamic performance by multi-point excitations. The transfer function set is obtained by averaging all transfer functions, and the set is processed by order selection to get 28 order modes. Fitting modal parameters and normalizing modal mass can gain natural frequencies and vibration modes of cab. Then, the modal analysis of truck cab is calculated based on the finite element method, and the results are compared with the test results. The improved measures are put forward to enhance the local stiffness, avoid modal coupling, and reduce vibration noise. So, this article supplies a reference for the dynamic test for the large body.

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Application of Operational Modal Analysis on Cars

Cited by 11 publications

References 1 publication

A Nonparametric Regularization for Spectrum Estimation of Time-Varying Output-Only Measurements

A Nonparametric Regularization for Spectrum Estimation of Time-Varying Output-Only Measurements

Static Loads Influence on Modal Properties of the Composite Cylindrical Shells with Integrated Sensor Network

Modal analysis of a truck cab using the least squares complex exponent test method

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