Hybrid journal (It can contain Open Access articles) ISSN (Print) 1479-1471 - ISSN (Online) 1479-148X Published by Inderscience Publishers[448 journals]
Authors:Thimothy Harold Gonsalves, G.C. Mohan Kumar, M.R. Ramesh Pages: 89 - 109 Abstract: In this work the composite material shaft in high-speed rotor-bearing systems is analysed to achieve better rotor dynamics along with the effect of internal damping of the composite shaft. The pioneering studies on rotating composite shaft and internal damping are revisited to evaluate its effects on rotor dynamics of high-speed rotor-bearing systems. Two practical rotor-bearing systems are selected to study their suitability for composite shaft application where the composite material is used in the cold section while the existing steel alloy is retained in the hot section as well as at the ends. The rotor dynamic analysis shows significant improvements in rotor dynamics of one of the rotor-bearing systems where the first lateral mode changes to desirable rigid mode from flexure mode shape of existing metallic shaft rotor-bearing system. The frequency values of second and third modes also increase above the operating speed indicating a clear advantage in rotor dynamics. Keywords: Campbell diagram; composite material shaft; critical speed; external damping; flexural shaft mode; rotating internal damping; rotor dynamic analysis; rotor dynamic instability; rotor internal damping; unbalance Citation: International Journal of Vehicle Noise and Vibration, Vol. 15, No. 2/3 (2019) pp. 89 - 109 PubDate: 2020-04-03T23:20:50-05:00 DOI: 10.1504/IJVNV.2019.106371 Issue No:Vol. 15, No. 2/3 (2020)
Authors:Kuheli Mondal, Saurav Das, Nozomu Hamada, Aminudin Bin Hj. Abu, Saikat Das, Waleed Fekry Faris, Hoong Thiam Toh, Akij Ahmad Pages: 110 - 132 Abstract: Several secondary path, acoustic noise cancellation modelling causes the problems to increase the complexity of ANC implementation, reduction of performance caused by modelling error and requirement of auxiliary noise for secondary path modelling. The acoustic noise generated is further compounded by using secondary path identification which makes the system complex. There are several available ANC algorithms that do not require secondary path estimation for modifying the FxLMS algorithms. Due to drawbacks such as slow convergence speed and, complexity of the phase shift mechanism, a novel approach with no secondary path modelling is adopted, in which the adaptation stability is guaranteed by switching the sign of the step size. It is combined with the online tuneable delay of the reference signal to significantly improve the adaptation convergence properties of the algorithm. A new mathematical modelling has been proposed to reduce the acoustic noise that increases the convergence criteria. Keywords: ANC; delay LMS; secondary path modelling; time domain; all-pass filtered x LMS Citation: International Journal of Vehicle Noise and Vibration, Vol. 15, No. 2/3 (2019) pp. 110 - 132 PubDate: 2020-04-03T23:20:50-05:00 DOI: 10.1504/IJVNV.2019.106372 Issue No:Vol. 15, No. 2/3 (2020)
Authors:Alexander Steinwolf, Peter Wolfsteiner Pages: 133 - 153 Abstract: Random vibration testing with increased kurtosis introduces high peaks into shaker drive signals to simulate land vehicle vibration more accurately or to shorten duration of fatigue damage testing. For the latter, the kurtosis control method must be able to pass high kurtosis values from the generated shaker vibration into the stress response of the tested component. It was verified and confirmed in the paper that the method of phase manipulation based on the analytical relationship between the IFFT phases and kurtosis was capable of doing so if the resonance frequency of the component is known. However, the fatigue damage spectrum model used for evaluation of time-to-failure considers not just one but a number of resonance frequencies constituting a certain test profile which cannot be simulated by the kurtosis control alone. For this purpose, the phase manipulation method was developed further and verified for operational vibrations of a railway vehicle. Keywords: vibration testing; kurtosis; IFFT phases; fatigue damage spectrum; FDS; accelerated lifetime testing Citation: International Journal of Vehicle Noise and Vibration, Vol. 15, No. 2/3 (2019) pp. 133 - 153 PubDate: 2020-04-03T23:20:50-05:00 DOI: 10.1504/IJVNV.2019.106375 Issue No:Vol. 15, No. 2/3 (2020)
Authors:Alexander Steinwolf, Peter Wolfsteiner Pages: 154 - 167 Abstract: Bispectrum analysis is able to suppress the Gaussian noise and analyse quadratic phase coupling in the signals more accurately. However, traditional bispectrum has the problem of losing fault information at low frequency, and may not comprehensively reflect nonlinear information of the fault, which leads to weak diagnostic ability, especially for local rub-impact fault. For this reason, a new feature extraction method called vector-bispectrum energy operator is presented in this paper, which adopts vector-bispectrum based on Teager energy operator and is used to obtain the fault feature of local rubbing rotor. The results of the experiment show that the feature of the local rubbing fault extracted by Teager energy operator based vector-bispectrum is very noticeable, and the fault classification through SVM has a high recognition rate. Keywords: rub rotor; fault feature extraction; high order statistics; bispectrum energy Citation: International Journal of Vehicle Noise and Vibration, Vol. 15, No. 2/3 (2019) pp. 154 - 167 PubDate: 2020-04-03T23:20:50-05:00 DOI: 10.1504/IJVNV.2019.106377 Issue No:Vol. 15, No. 2/3 (2020)
Authors:Ajay Kumar Verma, Pratap B. Deshmukh, Mohan L. Verma, Vikky Kumhar Pages: 168 - 191 Abstract: The present study is a numerical investigation on the vibration and deflection characteristics of an industry-driven carbon-boron/epoxy hybrid laminated composite plate that is partially cracked. The effect of laminated stacking sequence, volume fraction and crack length on natural frequency are investigated. The study is carried out using analytical methods, such as classical laminated theory, finite element analysis (FEA) and artificial neural network (ANN) for trained sets. Validation and comparison of the present work has been made with the work by Khdeir and Librescu on analysis of symmetric cross-ply laminated elastic plates using a higher-order theory, in which buckling and free vibration were considered. In this study, the CCSS boundary condition is used. A very good agreement has been observed between the analytical and FEA results. The concept of mechanical behaviour is introduced to address both the natural frequency and deflection criteria, with which a design guideline for robust hybrid composites is given. Keywords: vibration; hybrid composite; crack; classical lamination theory; CLT; finite element analysis; FEA; artificial neural network; ANN; MATLAB; Ansys Citation: International Journal of Vehicle Noise and Vibration, Vol. 15, No. 2/3 (2019) pp. 168 - 191 PubDate: 2020-04-03T23:20:50-05:00 DOI: 10.1504/IJVNV.2019.106378 Issue No:Vol. 15, No. 2/3 (2020)
Authors:Said Grami, Naser Nawayseh, Sadeque Hamdan Pages: 192 - 204 Abstract: This study investigates the effect of car speed on the vibration transmitted to the passenger through both the seat pan and backrest. Ten male subjects sat in the front passenger seat of a sedan car and were driven at three different speeds (60, 80 and 100 km/h). During each ride, the vibration dose value (VDV) was measured in the x, y and z-directions on the seat pan and at the backrest. The results showed an increase in the VDV in all directions with increasing the car speed. The VDVs at the backrest were found as high as, or even higher than, those measured on the seat depending on the speed and the measurement axis. Hence, it is recommended that vibration in road vehicles be assessed using more than one speed while taking into consideration measurement at the backrest. Keywords: car speed; vibration transmission; vibration dose value; VDV; backrest Citation: International Journal of Vehicle Noise and Vibration, Vol. 15, No. 2/3 (2019) pp. 192 - 204 PubDate: 2020-04-03T23:20:50-05:00 DOI: 10.1504/IJVNV.2019.106381 Issue No:Vol. 15, No. 2/3 (2020)
Hybrid journal (It can contain Open Access articles)
[448 journals]
