Hybrid journal (It can contain Open Access articles) ISSN (Print) 1479-1471 - ISSN (Online) 1479-148X Published by Inderscience Publishers[444 journals]
Authors:Mahieddine Chettah, Rachid Lassoued Pages: 1 - 20 Abstract: In this paper, closed-form expressions based on the Rayleigh's method is studied theoretically to evaluate the first two mode shapes and fundamental frequencies of a cracked elastically supported beam. Such a problem has not been very well investigated in the literature. The Euler-Bernoulli beam theory is employed to model the cracked beam and the crack is represented as a rotational spring. Some numerical examples are given to illustrate the proposed method and to present the effect of cracks on the natural frequencies and mode shapes of this cracked system. The results are compared with analytical, numerical and previous experimental studies. It is found that the present method is simpler in application, decreases the time and cost of computations, and shows a good promise for further development as a practical method to minimise the difference between measured and calculated results; also it can be an alternative solution in the case of crack identification for elastically supported beams. Keywords: cracked beam; elastic bearing; rotational spring; Rayleigh's method; transfer matrix method; vibration Citation: International Journal of Vehicle Noise and Vibration, Vol. 15, No. 1 (2019) pp. 1 - 20 PubDate: 2019-09-09T23:20:50-05:00 DOI: 10.1504/IJVNV.2019.102150 Issue No:Vol. 15, No. 1 (2019)
Authors:Djamal Zarour, Marc Thomas, Salim Meziani Pages: 21 - 41 Abstract: In order to improve the diagnosis of bearing defects, a new method called variational mode decomposition (VMD) is proposed. This research shows an experimental application for the detection of bearing defects at two stages of degradation: at the early stage and at an advanced stage. In this work, a comparative experimental study between vibratory and acoustic emission measurements, analysed by VMD, is carried out. However, the application of this method requires determining the number of significant frequencies (K) and a balancing parameter (α). For this purpose, the operational modal analysis (OMA) and a correlation study are used to determine the required parameters K and α. The results show that both measurement methods work well to detect the bearing frequencies, but the vibration measurement was more sensitive for an early detection. Keywords: variational mode decomposition; VMD; empirical mode decomposition; bearing fault; operational modal analysis; OMA; vibration; acoustic emission Citation: International Journal of Vehicle Noise and Vibration, Vol. 15, No. 1 (2019) pp. 21 - 41 PubDate: 2019-09-09T23:20:50-05:00 DOI: 10.1504/IJVNV.2019.102151 Issue No:Vol. 15, No. 1 (2019)
Authors:Hazem S. Zibdeh, Ahmad S. Abu Hannieh Pages: 42 - 67 Abstract: This paper develops an analytical solution for the dynamic response of a Euler-Bernoulli functionally graded (FG) beam subjected to a load moving with constant velocity and different types of attachments. The classical beam theory (CBT) is used to derive the equation of motion. The material properties of the beam are considered to vary continuously in the transverse direction according to an exponential and a power law models. The stress distribution is evaluated and the location of the neutral axis of the FG beam is obtained. Different types of attachments connected to the beam at specific locations are analysed. The effect of using FG materials to enhance the properties of the beam, resulting in a decreased response of the beam, is made clear. Also, the effect of the restoring force of attachments in reducing the dynamic response of the beam is discussed. Keywords: forced vibration; functionally graded beams; attachments on beams; moving load Citation: International Journal of Vehicle Noise and Vibration, Vol. 15, No. 1 (2019) pp. 42 - 67 PubDate: 2019-09-09T23:20:50-05:00 DOI: 10.1504/IJVNV.2019.102152 Issue No:Vol. 15, No. 1 (2019)
Authors:Mary Kate Freund, Oumar Rafiou Barry Pages: 68 - 88 Abstract: Electric power steering (EPS) systems have become the ideal steering system for most vehicles because of the generated torque assist mechanism making steering easier for drivers. However, EPS systems generate unwanted noise and vibration that can adversely affect the comfort and health of drivers. Numerous studies have been conducted to examine the source of vibrations. Various isolation techniques including passive, active, or semi active have been proposed for achieving best noise and vibration attenuation. Discrete and distributed mathematical models have been employed to predict the dynamic response of EPS systems. This paper presents a state-of-the-art review of mathematical modelling, vibration isolation methods, and optimisation techniques used for improving the design of EPS systems. Keywords: electric power steering; noise; vibration; isolation; optimisation Citation: International Journal of Vehicle Noise and Vibration, Vol. 15, No. 1 (2019) pp. 68 - 88 PubDate: 2019-09-09T23:20:50-05:00 DOI: 10.1504/IJVNV.2019.102161 Issue No:Vol. 15, No. 1 (2019)
Hybrid journal (It can contain Open Access articles)
[444 journals]
