Pub Date : 2018-01-01DOI: 10.20855/ijav.2018.23.11286
Aleksey Nikolaevich Puzankov, Dmitry Lvovich Shchegolev, V. A. Tishkov, V. N. Bobylev
The article presents the experimental data of research of sound insulation of window structures using supplementary damping along the perimeter of the translucent portion of the protection with a strip of non-transparent vibration-damping material (edge damping). The authors considered a method for calculating double translucent protective structures with edge damping. They gave versions of possible design solutions for these protective structures.
{"title":"Extra Edge Damping as a Way to Improve Sound Insulation of Window Structures","authors":"Aleksey Nikolaevich Puzankov, Dmitry Lvovich Shchegolev, V. A. Tishkov, V. N. Bobylev","doi":"10.20855/ijav.2018.23.11286","DOIUrl":"https://doi.org/10.20855/ijav.2018.23.11286","url":null,"abstract":"The article presents the experimental data of research of sound insulation of window structures using supplementary damping along the perimeter of the translucent portion of the protection with a strip of non-transparent vibration-damping material (edge damping). The authors considered a method for calculating double translucent protective structures with edge damping. They gave versions of possible design solutions for these protective structures.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"23 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67722272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-01DOI: 10.20855/IJAV.2018.23.11102
A. Malarkodi, G. Latha, P. Sridhar, N. Bøgholm
This paper describes the design and implementation of a low frequency hydrophone calibration system, using a vibrating water column. The hydrophone to be calibrated is immersed in the water column and the position of the transducer is kept constant while a hydrodynamic pressure field is generated in the water column by means of a shaker (similar to what is described in IEC 60565). F. Schloss et al. used a vibrating water column for hydrophone calibration in the frequency range from 10 Hz to 700 Hz.1 An interlaboratory comparison calibration was carried out by the Russian Metrological Institute of Technical Physics and Radio Engineering (VNIIFTRI) and Hangzhou Applied Acoustics Research Institute (HAARI) in the frequency range from 250 Hz to 1 kHz.2 The dimensions of the test vessel are important for deciding the frequency range of operation. Simulations were carried out for the selection of vessel material and dimension. To overcome limitations in the frequency range caused by resonance in the water column, the principle of operation was modified from absolute calibration to calibration by comparison. By using a single cylindrical vessel, the frequency range is extended to cover frequencies from less than 100 Hz to 1 kHz. The calibrated reference hydrophone type Bruel & Kjaer (B&K) 8104 is used in this calibration. Some results obtained from the use of the calibration system are also presented in this paper. 1
{"title":"Design Considerations and Establishment of a Low Frequency Hydrophone Calibration Setup using the Principle of Vibrating Water Column","authors":"A. Malarkodi, G. Latha, P. Sridhar, N. Bøgholm","doi":"10.20855/IJAV.2018.23.11102","DOIUrl":"https://doi.org/10.20855/IJAV.2018.23.11102","url":null,"abstract":"This paper describes the design and implementation of a low frequency hydrophone calibration system, using a vibrating water column. The hydrophone to be calibrated is immersed in the water column and the position of the transducer is kept constant while a hydrodynamic pressure field is generated in the water column by means of a shaker (similar to what is described in IEC 60565). F. Schloss et al. used a vibrating water column for hydrophone calibration in the frequency range from 10 Hz to 700 Hz.1 An interlaboratory comparison calibration was carried out by the Russian Metrological Institute of Technical Physics and Radio Engineering (VNIIFTRI) and Hangzhou Applied Acoustics Research Institute (HAARI) in the frequency range from 250 Hz to 1 kHz.2 The dimensions of the test vessel are important for deciding the frequency range of operation. Simulations were carried out for the selection of vessel material and dimension. To overcome limitations in the frequency range caused by resonance in the water column, the principle of operation was modified from absolute calibration to calibration by comparison. By using a single cylindrical vessel, the frequency range is extended to cover frequencies from less than 100 Hz to 1 kHz. The calibrated reference hydrophone type Bruel & Kjaer (B&K) 8104 is used in this calibration. Some results obtained from the use of the calibration system are also presented in this paper. 1","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"23 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67722593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-01DOI: 10.20855/IJAV.2018.23.11148
E. Costa, L. Godinho, J. Santiago, W. Mansur
In this work, the three-dimensional formulation of the Method of Fundamental Solutions (MFS) is applied to model acoustic problems in the frequency domain. This formulation is developed by making use of adequate Green’s function defined by the image-source technique, reducing the discretization necessary for the definition of the numerical model. The proposed approach is applied to study the sound attenuation provided by an acoustic attenuating device, consisting of a closed acoustic space located between inlet and outlet tubes. Absorbent properties of the lining materials of the acoustic device, defined using laboratory measurements of their absorption coefficients, are incorporated into the model. The proposed model is verified against reference numerical models based on a boundary integral equation formulation. An experimental validation is also performed, demonstrating that the model adequately simulates the sound propagation under experimental conditions. Numerical applications are then presented to demonstrate the behaviour of the system under different conditions.
{"title":"Efficient Model for Acoustic Attenuators using the Method of Fundamental Solutions","authors":"E. Costa, L. Godinho, J. Santiago, W. Mansur","doi":"10.20855/IJAV.2018.23.11148","DOIUrl":"https://doi.org/10.20855/IJAV.2018.23.11148","url":null,"abstract":"In this work, the three-dimensional formulation of the Method of Fundamental Solutions (MFS) is applied to model acoustic problems in the frequency domain. This formulation is developed by making use of adequate Green’s function defined by the image-source technique, reducing the discretization necessary for the definition of the numerical model. The proposed approach is applied to study the sound attenuation provided by an acoustic attenuating device, consisting of a closed acoustic space located between inlet and outlet tubes. Absorbent properties of the lining materials of the acoustic device, defined using laboratory measurements of their absorption coefficients, are incorporated into the model. The proposed model is verified against reference numerical models based on a boundary integral equation formulation. An experimental validation is also performed, demonstrating that the model adequately simulates the sound propagation under experimental conditions. Numerical applications are then presented to demonstrate the behaviour of the system under different conditions.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"23 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67722671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-01DOI: 10.20855/IJAV.2018.23.11063
R. Talebitooti, R. Bayat
In this paper, a PID controller for a special road-rail vehicle is developed. The dynamic model is derived to properly consider the vehicle and track vibrations. This model contains the effects of track elasticity which makes it more reliable and precious compared to traditional models. The vehicle model contains a two dimensional 10 DOF vehicle model, and the track model consists of 40 sleepers. In addition, the effect of the sleeper number on car-body vibration is investigated. The results show that the present vehicle-track coupled model is more efficient in controller design compared to traditional ones. Finally, tuning of controller gains is performed with the aid of a genetic algorithm, in order to achieve a well-organized active suspension.
{"title":"Active-suspension Design for a Special Road-Rail Vehicle Based on Vehicle-Track Coupled Model Using Genetic Algorithm","authors":"R. Talebitooti, R. Bayat","doi":"10.20855/IJAV.2018.23.11063","DOIUrl":"https://doi.org/10.20855/IJAV.2018.23.11063","url":null,"abstract":"In this paper, a PID controller for a special road-rail vehicle is developed. The dynamic model is derived to properly consider the vehicle and track vibrations. This model contains the effects of track elasticity which makes it more reliable and precious compared to traditional models. The vehicle model contains a two dimensional 10 DOF vehicle model, and the track model consists of 40 sleepers. In addition, the effect of the sleeper number on car-body vibration is investigated. The results show that the present vehicle-track coupled model is more efficient in controller design compared to traditional ones. Finally, tuning of controller gains is performed with the aid of a genetic algorithm, in order to achieve a well-organized active suspension.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"23 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67722465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-01DOI: 10.20855/IJAV.2018.23.11059
E. Hernández, I. García, Juan Manuel López Navarro, I. Campos-Cantón, E. Kolosovas-Machuca
The levels of noise produced in university facilities by students, increases the noise annoyance. The quality of life and the academic performance of university students could be inuenced by this factor. Unfortunately, as far as methodology is concerned, there are no regulations or standards that allow for the correct evaluation of noise annoyance at educative facilities. In this work a method for the evaluation of noise annoyance and an indicator of noise annoyance are presented. In order to obtain a numerical value, a percentage index, and a verbal index that represents the noise annoyance in a specific area at university facilities, psychoacoustic annoyance (PA) and evaluation of perception of noise annoyance has been related. Resulting from this correlation an indicator of noise annoyance was proposed. The results were associated with this indicator. The method and the proposed indicator allow for deeper evaluation of noise annoyance and facilitate the development of appropriate actions against noise. 1
{"title":"Evaluation of Psychoacoustic Annoyance and Perception of Noise Annoyance Inside University Facilities","authors":"E. Hernández, I. García, Juan Manuel López Navarro, I. Campos-Cantón, E. Kolosovas-Machuca","doi":"10.20855/IJAV.2018.23.11059","DOIUrl":"https://doi.org/10.20855/IJAV.2018.23.11059","url":null,"abstract":"The levels of noise produced in university facilities by students, increases the noise annoyance. The quality of life and the academic performance of university students could be inuenced by this factor. Unfortunately, as far as methodology is concerned, there are no regulations or standards that allow for the correct evaluation of noise annoyance at educative facilities. In this work a method for the evaluation of noise annoyance and an indicator of noise annoyance are presented. In order to obtain a numerical value, a percentage index, and a verbal index that represents the noise annoyance in a specific area at university facilities, psychoacoustic annoyance (PA) and evaluation of perception of noise annoyance has been related. Resulting from this correlation an indicator of noise annoyance was proposed. The results were associated with this indicator. The method and the proposed indicator allow for deeper evaluation of noise annoyance and facilitate the development of appropriate actions against noise. 1","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"23 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67722563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-01DOI: 10.20855/ijav.2018.23.11138
Amirali Sadeqi, S. Moradi
Material damping treatments, such as adding viscoelastic layers (VEL) to engineered structures, are commonly used for vibration attenuation. Study of the VEL geometry, shape, location (in case of partially adding), and arrangement (in composites), are of engineering interest to optimize the damping effect versus the weight and cost. In order to show the possibility of higher damping characteristics for shorter VEL, this paper aims for a two-step vibration analysis of an elastic cantilever beam with an unconstrained partial VEL. The governing equations are developed based on Euler-Bernoulli beam theory and Kelvin-Voigt viscoelastic model. In order to answer how the VEL length and thickness affect the modal parameters and dynamic response, both free and forced vibration problems are solved analytically, and the results are manipulated to achieve a much more applicable size range with higher damping characteristic. A non-uniform trend and inconsistent behaviour in both frequency and amplitude changes is observed versus increasing the VEL length, which addresses the necessity of an optimization challenge and gives a good insight to take into account the concept of VEL critical length.
{"title":"Vibration Analysis of Elastic Beams With Unconstrained Partial Viscoelastic Layer","authors":"Amirali Sadeqi, S. Moradi","doi":"10.20855/ijav.2018.23.11138","DOIUrl":"https://doi.org/10.20855/ijav.2018.23.11138","url":null,"abstract":"Material damping treatments, such as adding viscoelastic layers (VEL) to engineered structures, are commonly used for vibration attenuation. Study of the VEL geometry, shape, location (in case of partially adding), and arrangement (in composites), are of engineering interest to optimize the damping effect versus the weight and cost. In order to show the possibility of higher damping characteristics for shorter VEL, this paper aims for a two-step vibration analysis of an elastic cantilever beam with an unconstrained partial VEL. The governing equations are developed based on Euler-Bernoulli beam theory and Kelvin-Voigt viscoelastic model. In order to answer how the VEL length and thickness affect the modal parameters and dynamic response, both free and forced vibration problems are solved analytically, and the results are manipulated to achieve a much more applicable size range with higher damping characteristic. A non-uniform trend and inconsistent behaviour in both frequency and amplitude changes is observed versus increasing the VEL length, which addresses the necessity of an optimization challenge and gives a good insight to take into account the concept of VEL critical length.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"23 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67722658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-01DOI: 10.20855/IJAV.2018.23.11241
S. J. K. Florence, K. Renji, K. Subramanian
Honeycomb sandwich shells with composite face sheets are of extensive use in the spacecraft industry. Information on the number of resonant modes present in a frequency band is required to study their response behaviour under acoustic excitation. Modal densities of thin composite cylindrical shells have been reported while transverse shear deformations have not been considered. But in honeycomb sandwich panels, transverse shear deformations are significant, especially at higher order modes of vibration. In this work expressions for natural frequency and modal density of composite cylinders incorporating transverse shear deformation are derived. The modal densities of a typical cylinder that are obtained using the derived expression are compared with the results obtained using the finite element method and they are similar. Effects of transverse shear and orthotropic nature of the face sheets on the modal densities are investigated. It is shown that computing the modal density of honeycomb sandwich cylinders without considering the transverse shear deformation can lead to significant errors at high frequencies. Expressions of modal densities for special cases are also derived from the general expression.
{"title":"Modal Density of Honeycomb Sandwich Composite Cylindrical Shells Considering Transverse Shear Deformation","authors":"S. J. K. Florence, K. Renji, K. Subramanian","doi":"10.20855/IJAV.2018.23.11241","DOIUrl":"https://doi.org/10.20855/IJAV.2018.23.11241","url":null,"abstract":"Honeycomb sandwich shells with composite face sheets are of extensive use in the spacecraft industry. Information on the number of resonant modes present in a frequency band is required to study their response behaviour under acoustic excitation. Modal densities of thin composite cylindrical shells have been reported while transverse shear deformations have not been considered. But in honeycomb sandwich panels, transverse shear deformations are significant, especially at higher order modes of vibration. In this work expressions for natural frequency and modal density of composite cylinders incorporating transverse shear deformation are derived. The modal densities of a typical cylinder that are obtained using the derived expression are compared with the results obtained using the finite element method and they are similar. Effects of transverse shear and orthotropic nature of the face sheets on the modal densities are investigated. It is shown that computing the modal density of honeycomb sandwich cylinders without considering the transverse shear deformation can lead to significant errors at high frequencies. Expressions of modal densities for special cases are also derived from the general expression.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"23 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67722712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-01-01DOI: 10.20855/IJAV.2018.23.11064
S. Mondal, S. Chakraborty
A combined numerical-experimental technique has been implemented using the finite element model updating technique to estimate a set of proportional viscous damping parameters for determining the global responses of fibre reinforced plastic (FRP) plates over a chosen frequency range of interest. The experimentally determined frequencies and mode shapes are used to update the homogenised anisotropic in-plane material constants, before estimating the damping parameters from the directly observed frequency response functions (FRFs). Gradient based inverse sensitivity method has been implemented for the parameter estimation. Existing FRP structures may degrade considerably due to environmental effects over the long period of existence—changing the material and damping properties significantly compared to their initial values after fabrication—thus requiring updating. The estimated viscous damping parameters using the current technique reproduces higher values of modal damping factors for FRP plates. For nonviscous damping, estimation of a set of relaxation factors produces a more realistic estimate of modal damping factors. Increased value of the relaxation factors make the model coincide with the viscous one. A numerically simulated plate problem has been presented along with the experimental validation.
{"title":"Estimation of Viscous Damping Parameters of Fibre Reinforced Plastic Plates using Finite Element Model Updating","authors":"S. Mondal, S. Chakraborty","doi":"10.20855/IJAV.2018.23.11064","DOIUrl":"https://doi.org/10.20855/IJAV.2018.23.11064","url":null,"abstract":"A combined numerical-experimental technique has been implemented using the finite element model updating technique to estimate a set of proportional viscous damping parameters for determining the global responses of fibre reinforced plastic (FRP) plates over a chosen frequency range of interest. The experimentally determined frequencies and mode shapes are used to update the homogenised anisotropic in-plane material constants, before estimating the damping parameters from the directly observed frequency response functions (FRFs). Gradient based inverse sensitivity method has been implemented for the parameter estimation. Existing FRP structures may degrade considerably due to environmental effects over the long period of existence—changing the material and damping properties significantly compared to their initial values after fabrication—thus requiring updating. The estimated viscous damping parameters using the current technique reproduces higher values of modal damping factors for FRP plates. For nonviscous damping, estimation of a set of relaxation factors produces a more realistic estimate of modal damping factors. Increased value of the relaxation factors make the model coincide with the viscous one. A numerically simulated plate problem has been presented along with the experimental validation.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"23 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67722474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-12-01DOI: 10.20855/IJAV.2017.22.4487
L. Son, M. Bur, M. Rusli, H. Matsuhisa, Keisuke Yamada, H. Utsuno
A shock load occurred in a short time duration can lead to dangerous effect on the machine or structure. The use of conventional technique for shock vibration control by modifying the systems damping reduces the steady-state response of the system. However, this method fails to attenuate a large acceleration peak at the moment after the shock. An alternative method for reducing the maximum acceleration peak due to shock load using the principle of momentum exchange has been developed. When the shock excitation frequency is much larger in comparison with the main mass natural frequency, the passive momentum exchange impact damper(PMEID) produces good performance. However, the performance of PMEID decreases as the shock excitation frequency close to the main mass natural frequency. In this research, a simple technique to improve the performance of PMEID utilizing the pre-straining spring mechanism (PSMEID) is proposed. The dynamic model of the system with PSMEID is derived. Next, the simulation is conducted to evaluate the effectiveness of the proposed method.
{"title":"Fundamental Study of Momentum Exchange Impact Damper Using Pre-straining Spring Mechanism","authors":"L. Son, M. Bur, M. Rusli, H. Matsuhisa, Keisuke Yamada, H. Utsuno","doi":"10.20855/IJAV.2017.22.4487","DOIUrl":"https://doi.org/10.20855/IJAV.2017.22.4487","url":null,"abstract":"A shock load occurred in a short time duration can lead to dangerous effect on the machine or structure. The use of conventional technique for shock vibration control by modifying the systems damping reduces the steady-state response of the system. However, this method fails to attenuate a large acceleration peak at the moment after the shock. An alternative method for reducing the maximum acceleration peak due to shock load using the principle of momentum exchange has been developed. When the shock excitation frequency is much larger in comparison with the main mass natural frequency, the passive momentum exchange impact damper(PMEID) produces good performance. However, the performance of PMEID decreases as the shock excitation frequency close to the main mass natural frequency. In this research, a simple technique to improve the performance of PMEID utilizing the pre-straining spring mechanism (PSMEID) is proposed. The dynamic model of the system with PSMEID is derived. Next, the simulation is conducted to evaluate the effectiveness of the proposed method.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47238184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-12-01DOI: 10.20855/ijav.2017.22.4490
M. Messer
In this paper the parametric excitation of vibrations in printing machines is analysed both experimentally and theoretically. Initially, selected results from experimental studies of these drive-belt-induced torsional vibrations are discussed. For this, twelve different drive belts are used during experiments at a test rig and at a sheet-fed offset printing machine. Measured vibration amplitudes from machine and test rig correlate very well. Depending on the chosen drive belt, large vibration amplitudes occur during printing in the vicinity of a critical production speed, where the first drive belt order coincides with the machine’s first eigenfrequency. This results in a clearly visible rhythm during printing and is therefore unacceptable. It is demonstrated experimentally, that active vibration control can be used successfully to reduce these parametrically excited torsional vibrations in sheet-fed offset printing machines. Furthermore, the machine is modelled as a dynamical multi-degree of freedom system with time-periodic coefficients, and the parametric excitation of torsional vibrations is studied numerically. First, a numerical stability analysis is carried out employing Floquet theory. The system’s damping parameters are derived from measured machine data. Accordingly, a simulation model with drive control results in parametrically excited torsional vibration amplitudes that match very well with measured amplitudes.
{"title":"Parametric Excitation of Vibrations in Printing Machines","authors":"M. Messer","doi":"10.20855/ijav.2017.22.4490","DOIUrl":"https://doi.org/10.20855/ijav.2017.22.4490","url":null,"abstract":"In this paper the parametric excitation of vibrations in printing machines is analysed both experimentally and theoretically. Initially, selected results from experimental studies of these drive-belt-induced torsional vibrations are discussed. For this, twelve different drive belts are used during experiments at a test rig and at a sheet-fed offset printing machine. Measured vibration amplitudes from machine and test rig correlate very well. Depending on the chosen drive belt, large vibration amplitudes occur during printing in the vicinity of a critical production speed, where the first drive belt order coincides with the machine’s first eigenfrequency. This results in a clearly visible rhythm during printing and is therefore unacceptable. It is demonstrated experimentally, that active vibration control can be used successfully to reduce these parametrically excited torsional vibrations in sheet-fed offset printing machines. Furthermore, the machine is modelled as a dynamical multi-degree of freedom system with time-periodic coefficients, and the parametric excitation of torsional vibrations is studied numerically. First, a numerical stability analysis is carried out employing Floquet theory. The system’s damping parameters are derived from measured machine data. Accordingly, a simulation model with drive control results in parametrically excited torsional vibration amplitudes that match very well with measured amplitudes.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"22 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41474652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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