Elimination of transducer mass loading effects from frequency response functions

Çakar, Orhan; Şanlıtürk, Kenan Y.

doi:10.1016/s0888-3270(03)00086-4

Cited by 83 publications

(49 citation statements)

References 8 publications

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“…The accelerometer directly changes the dynamics of the system and causes the measured resonant frequencies to deviate from their correct values. Methods of correcting of the mass loading effects on the direct FRFs are reported by [33,38].…”

Section: Experimental Modal Analysismentioning

confidence: 99%

A new damping modelling approach and its application in thin wall machining

Adetoro

Wen

Sim

2010

Int J Adv Manuf Technol

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In this paper, a new approach to modelling the damping parameters and its application in thin wall machining is presented. The approach to predicting the damping parameters proposed in this paper eliminates the need for experiments otherwise used to acquire these parameters. The damping model proposed was compared with available damping models and experimental results. A finite element analysis and Fourier transform approach has been used to obtain frequency response function (FRF) needed for stability lobes prediction. Several predicted stable regions using both experimental and numerical FRF's for various examples gave a good comparison.

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Section: Experimental Modal Analysismentioning

confidence: 99%

A new damping modelling approach and its application in thin wall machining

Adetoro

Wen

Sim

2010

Int J Adv Manuf Technol

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“…Ashory [6] proposed a method in which transfer FRFs can be corrected if the measurement is repeated with an accelerometer of different mass. Cakar and Sanliturk [7] presented a correction method by employing dummy mass. Ren et al [8,9] proposed a correction method for eliminating accelerometer and force transducer mass loading effects from measured FRFs in shaker modal testing.…”

Section: Introductionmentioning

confidence: 99%

Correction of Transducers Mass Effects from the Measured FRFs in Hammer Impact Testing

Ren¹,

Wang²,

Bi³

2017

Shock and Vibration

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In modal testing, the measured frequency response functions (FRFs) are often affected by transducer mass effects. Especially when multiple sensors are employed, transducers mass effects are more significant. This paper deals with removing sensors mass effects from the measured FRFs in hammer impact testing. The proposed method offers some advantages over the available techniques in that extra FRFs measurements with different configurations are not required during the correction process. Firstly, correction method for single accelerometer case is discussed. Further, general correction formulation for multiple accelerometers case is derived. Then, validations of the proposed method are demonstrated using simulated and experimental data. It shows good effectiveness in experimental validation for single accelerometer case. Numerical simulation also demonstrates a good performance for multiple accelerometers case. However, further simulations with noisy-polluted data show that the accuracy of correction results will be affected to some extent by the noise. It is suggested that the measured FRFs be preprocessed using the curve-fitting procedure or noise reduction processing before applying the proposed method.

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“…The accuracy achieved in the estimation of the scaling factors is dependent on the identification of modal parameters [1][2][3] and the mass modification strategy used to alter the dynamic behavior of the structure [4][5][6]. The methodology for mass modification is based on the size, location and number of masses added to the structure.…”

Section: Introductionmentioning

confidence: 99%

“…with respect to the frequency ratio , (2) resulting in (2) Also, in [14] demonstrated that a relative error ε η ω in the frequency ratio of a given mode of vibration, induces a relative error given by the expression (2) in the scale factor ε α . However, it should be noted that this relationship between relative errors is applicable to the variation of frequency ratio with respect to itself , and not to the difference between the relative errors (3) that correspond to the frequency before (ω 0 ) and after (ω 1 ) the change in mass (which is as shown in [14]), i.e.…”

Section: Introductionmentioning

confidence: 99%

Error analysis in obtaining scale factors with operational modal analysis and mass change

García¹

2015

Rev. Fac. Ing. Antioquia

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In operational modal analysis, the accuracy obtained in the identification of modal parameters, on the one hand, and the expertise in the modification of mass used to alter the dynamic behavior of the structure, on the other, decisively affect the accuracy achieved in the estimation of the scaling factors. Through experimental tests and numerical calculations, both the experimental validation of the estimate of the error in the scaling factor due to errors in the mode of vibration and the analysis of the influence of the modal mass in the variation of the scale factor, have been carried out. From all the above, it is concluded that it is necessary to pay special attention to how to make and modify inertial increments, i.e. changes in mass.----------Keywords: operational modal analysis, scaling factors, sensitivity, mass-change method ResumenEn el análisis modal operacional, por una parte, la exactitud obtenida en la identificación de los parámetros modales y, por otra, la pericia en la modificación de masa utilizada para alterar el comportamiento dinámico de la estructura, afectan de forma decisiva la exactitud alcanzada en la estimación de los factores de escala. Mediante ensayos experimentales y cálculo numérico, se ha realizado la validación experimental de la estimación del error en el factor de escala debido a errores en el modo de vibración, así como el análisis de la influencia de la masa modal en la variación del factor de escala. De 203Error analysis in obtaining scale factors with operational modal analysis and mass change todo ello se concluye que es necesario prestar especial atención a la forma de realizar y modificar los incrementos inerciales, es decir, la modificación de masa.----------Palabras clave: análisis modal operacional, factores de escala, sensibilidad, método del cambio de masa

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Elimination of transducer mass loading effects from frequency response functions

Cited by 83 publications

References 8 publications

A new damping modelling approach and its application in thin wall machining

A new damping modelling approach and its application in thin wall machining

Correction of Transducers Mass Effects from the Measured FRFs in Hammer Impact Testing

Error analysis in obtaining scale factors with operational modal analysis and mass change

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