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Conventional reliability assessment and reliability-based optimal design of belt drive are based on the stress–strength interference model. However, the stress–strength interference model is essentially a static model, and the sensitivity analysis of belt drive reliability with respect to design parameters needs further investigations. In this arti...
Citations
... Al Bulushi, A. A., Rameshkumar G. R. and Lokesha M. [10] proposes a methodology for condition monitoring of damaged belts based on vibration of the shafts where the pulleys are placed (revealed by accelerometers) described in time and frequency domains (by FFT). Ding H., Zhang Z. and Chen L. Q. [11] uses the amplitude spectrum of belt transverse vibration in order to highlight the possibilities to validate some resonant vibration reduction solutions and to confirm their analytical model. Hyun D., Kang T. J. and Kim J. propose in [12] to prevent the belt failure using an online condition detection method based on vibration monitoring (on acceleration spectrum). ...
For driving belt condition monitoring, the main interest is the certification of the capacity to keep their qualities unchanged over a long period of time and secondary to detect the imminence of the catastrophic failure. This paper presents a study on the behaviour detection and description of a flat driving belt health condition, used in a rotary machine electrically driven, particularly a lathe headstock gearbox running idle. It was discovered that in the mechanical power transmitted from electromotor to gearbox via a flat belt some specific sinusoidal components (a fundamental and some harmonics) of variable power are generated. The description of these power components (by values of amplitude, frequency and phase at origin of time) is indirectly detectable in the evolution of the active electrical power absorbed by the drive electromotor. Two arguments are available for this approach. Firstly, there is a reasonable assumption that between the mechanical power and the active electrical power there is an approximated proportionality relationship through the power efficiency. Secondly, the evolution of the active electrical power (or mechanical power as well) is a deterministic signal with a low level of noise. A simple computer assisted procedure of active electrical power signal acquisition and data processing was conceived, the detection was done by computer aided curve-fitting procedures in Matlab applied on active electrical power evolution absorbed by the driving motor in stationary working regimes (the electromotor playing the role of a mechanical power sensor). Mainly two ways of graphic representation have been proposed in order to describe the variable power generated by this flat belt (in time and frequency domains). The behaviour of many other types of belts involved in rotary machines driving can be similarly described.
... (24) Tension on slack side of belt (F 2 ). The tension on the slack side of the elevator belt was determined using Euler model in Eq. (25), which is the simplest theoretical model for belt drives 39,40 . ...
This research paper presents a step by step conceptual design and life prediction approach for the design, modeling and simulation of head shaft of a belt bucket elevator, to be used for conveying grains to a height of 33.5 m and at the rate of 200 tons/h. output. For this elevator system, the force and torque acting on the head shaft as well as the bending moment were calculated. Furthermore, the diameter of each cross section of the shaft was determined taking into consideration the geometric and fatigue stress concentration factors, due to shoulders which contribute significantly to most fatigue failures of shafts. The stress induced on the shaft by the force and the factor of safety for each cross section of the shaft was calculated using the DE-Goodman criterion. The model of the shaft was created from the calculated diameters and subjected to static and fatigue analysis using SolidWorks FEA. The results were validated by comparing the values from the FEA and the calculated values for stress and factor of safety of the critical section of the shaft, which showed an equivalent value. The FEA gave a fatigue load factor greater than one, which signifies that the shaft will not go into failure mode within the infinite life cycle of the shaft. The value of the fatigue strength obtained from FEA was higher than the value for the maximum von misses stress of the shaft, this result shows that the head shaft will sustain the loading stresses over a finite life prediction. This research is significant because the stress induced forces on the head shaft from each component of the elevator system were properly identified and analyzed so as to obtain precise results for life prediction.
... 5 The nonlinear behavior (hysteresis) of tensioner has an evident impact on the capacity of applied load, the dynamic performance and the working life of a belt drive system. [6][7][8] Now some researchers focused on the model of the dynamic characteristics for tensioner hysteresis, and the identification of model parameters of tensioner. Zhao et al. 9 developed a mathematical model to describe the hysteretic behavior of a spring-load tensioner. ...
... In the previous studies, [5][6][7][8][9][10][11][12][13][14][15][16][17][18] the research works are focused on the parameters identification and the physical model of tensioner. The analytical model stated in Zhu et al. 5 is suitable for a specific form, and the method for obtaining the hysteretic behavior of tensioner in a dynamic manner is not given. ...
An automatic tensioner that consists of a torsional spring and friction damping elements is widely used in belt drive system. The relation of the applied torque versus the imposed angle of tensioner during loading and unloading processes is described as a hysteretic loop. An analytical model is established for estimating the hysteretic behavior of a tensioner, and measurements for hysteretic loop in quasi-static and dynamic excitation are carried out to validate the analytical model. Taking one engine timing belt drive system as a studying example, the method and the procedure for estimating vibration responses of the nonlinear tensioner are given. An iterative algorithm for predicting the accurate equivalent viscous damping of tensioner is carried out in analyzing a belt drive system. The vibration responses of tensioner are validated by the measurement of timing belt drive system. The developed method presented in this article is useful for predicting the hysteretic behavior of tensioner, vibration responses, and the parameters optimization of a belt drive system.
