Mathematical Problems in Engineering

Volume 2014, Article ID 907627, 17 pages

http://dx.doi.org/10.1155/2014/907627

## Equilibria and Free Vibration of a Two-Pulley Belt-Driven System with Belt Bending Stiffness

^{1}College of Information Engineering, Qingdao University, Qingdao 266071, China^{2}Shandong Jiaotong University, Jinan 250023, China

Received 20 May 2014; Revised 4 August 2014; Accepted 3 September 2014; Published 9 October 2014

Academic Editor: Francesco Pellicano

Copyright © 2014 Jieyu Ding and Qingquan Hu. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

#### Abstract

Nonlinear equilibrium curvatures and free vibration characteristics of a two-pulley belt-driven system with belt bending stiffness and a one-way clutch are investigated. With nonlinear dynamical tension, the transverse vibrations of the translating belt spans and the rotation motions of the pulleys and the accessory shaft are coupled. Therefore, nonlinear piecewise discrete-continuous governing equations are established. Considering the bending stiffness of the translating belt spans, the belt spans are modeled as axially moving beams. The pattern of equilibria is a nontrivial solution. Furthermore, the nontrivial equilibriums of the dynamical system are numerically determined by using two different approaches. The governing equations of the vibration near the equilibrium solutions are derived by introducing a coordinate transform. The natural frequencies of the dynamical systems are studied by using the Galerkin method with various truncations and the differential and integral quadrature methods. Moreover, the convergence of the Galerkin truncation is investigated. Numerical results reveal that the study needs 16 terms after truncation in order to determine the free vibration characteristics of the pulley-belt system with the belt bending stiffness. Furthermore, the first five natural frequencies are very sensitive to the bending stiffness of the translating belt.

#### 1. Introduction

Pulley-belt systems play an important role in the power transmission. The vibration of pulley-belt dynamical systems greatly influences the perceived quality and the reliability of the dynamical system. Due to the complex nonlinear characteristics, pulley-belt dynamical systems have received a great deal of attention from various scholars and engineers [1–3]. Mote and Wu show nonlinear coupling occurs between vibration of the belt spans and wheels [4]. Kong and Parker evaluated that the influences of flexural rigidity on the equilibria [5] and the free vibration characteristics [6] of the pulley-belt dynamical system cannot be ignored. Moreover, Zhang and Zu found that the steady state solutions of serpentine belt drive system undergo Hopf bifurcation [7].

Pulley-belt systems in the power transmission always drive greater weight accessories, such as alternators, pumps, compressors, and fans. The driven pulley is connected to the accessories by a wrap spring. Nevertheless, the accessories with undesirable vibration transmit excessive noise and vibration to the vehicle occupants, to other vehicle structures, and may also promote the fatigue of the components of the pulley-belt systems. Moreover, the greater weight accessories may have a fatal damage to the pulley-belt system when the resonance or brake and so on behavior occur. One-way clutches are used to erase these unfavorable influences by eliminating the opposite direction torque transmission [8, 9]. Zhu and Parker proposed a one-way clutch model as the wrap spring with the power directional transmission function by using the harmonic balance method combined with arclength continuation [10] and the method of multiple scales [11]. The authors analyzed the nonlinear response of the dynamical system based on a piecewise two DOF discrete model and found that the discontinuous wrap spring significantly reduces resonance as an absorber. Furthermore, a simpler model by simplifying the discontinuous wrap spring as a rigidity device is proposed by Mockensturm and Balaji [12, 13]. Moreover, Gill-Jeong studied the nonlinear behavior of spur gear pairs with one-way clutches based on the rigidity model [14]. However, the transverse vibration of the translating belt has been ignored in all of the above-mentioned literatures.

On the other hand, Wang and Mote confirmed that there is significant error in the predicted vibration behaviors if the coupling between vibration of the band spans and wheels is neglected [15]. Beikmann et al. also focused attention on a key linear mechanism that couples tensioner arm rotation and transverse vibration of the adjacent belt spans [16]. It should be mentioned that only a few attention was paid to the vibration of the pulley-belt systems coupled greater weight accessories. By using rigidity model of the one-way clutch, Zhu and Parker investigated nonlinear periodic response of three-pulley belt-driven system [17]. Furthermore, Ding and Zu modeled the translating belt spans as axially moving strings and found the one-way clutch significantly reduces the amplitude of the nonlinear resonance pulley-belt system [18]. However, the influences of the bending stiffness of the transport belt on the dynamics behaviors of the pulley-belt system coupled with accessories have not been understood.

In the past three decades, the translating belt in power transmission systems has been modeled as axially moving strings and beams. Jha and Parker examined eigenvalue problems in configuration space by the spatial discretization of axially moving string and beam [19]. The boundary layers [20] and the dynamics [21] of a moving belt are explored by Pellicano and his coworkers. Kong and Parker believed that the bending stiffness of the translating belt introduces nontrivial span deflections and reduces the wrap angles [22]. Dufva et al. examined the influence of the belt bending stiffness on the nonlinear vibration of a two-roller pulley-belt system and concluded that the bending stiffness cannot be in general neglected in pulley-belt applications [23]. Furthermore, Zhu and Parker investigated the influences of the dry friction on the periodic response of power transmission systems with the bending stiffness [24]. Scurtu et al. studied the resonance of the automotive serpentine belt based on a two-dimensional beam model [25].

In the present paper, a two-pulley power transmission system coupled with a one-way clutch is established by considering the bending stiffness of the translating belt. The transport belt spans are modeled as axially moving viscoelastic beams and the viscoelastic material obeys the Kelvin model. Moreover, the nontrivial span deflections and the natural frequencies are numerically studied by using the Galerkin truncation method and the differential and integral quadrature methods.

The present paper is organized into five sections. Section 2 describes the modeling of a two-pulley belt-drive dynamical system coupled with an accessory by a discontinuous wrap spring. Two different approaches for determining the nontrivial equilibrium are presented in Section 3. In Section 4, the natural frequencies of coupled vibration of the pulley-belt system are discussed, and the Galerkin truncation with various terms and the quadrature methods are compared. Section 5 ends the paper with concluding remarks.

#### 2. Mathematical Model

Consider a two-pulley belt-drive dynamical system, in which the accessory shaft and the driven pulley are coupled by a wrap spring with stiffness , as illustrated schematically in Figure 1, where and , respectively, are the axial speed and the initial axial static tension of the translating belt and are assumed to be constant and uniform, is the length of the belt spans, is the neutral axis coordinate of the th belt span, is the transverse vibration displacement of the th belt span at and time , and , respectively, are the angular vibration displacements of the driven pulley and the driving pulley, is the preload between the accessory shaft and the driven pulley, and are the rotational inertia and the angular displacements of the accessory, respectively. In this work, the driving pulley and the driven pulley are assumed as the same sizes for simplicity. Furthermore, and , respectively, are the radius and the rotational inertia of the pulleys. It should be noted that the accessory as a load part is rigidly connected to the shaft. Moreover, the wrap spring disconnects when angular displacement of the driven pulley is smaller than that of the accessory shaft [10], and the accessory shaft disengages from the driven pulley. Therefore, the function of power transfers in one direction of the one-way clutch is mathematically modeled by the relative angular displacement. As shown in Figure 1, there is no mechanical link between the driven pulley and the accessory shaft for disengaging state.

Considering the bending stiffness of the belt, the two spans of the translating belt are both modeled as Euler-Bernoulli beams. The equation of transverse motion of the belt spans is given by [6, 26] where , and are the dynamic tension in the above and below belt span and are defined as where , , , and , respectively, are the density, Young’s modulus, the cross-sectional area, and the area moment of inertia of the belt, accounts for the bending stiffness, and all are assumed to be uniform. In following investigations, a rectangle-cross belt is considered. Therefore, the effect of the bending stiffness of the belt can be studied by showing the effects of Young’s modulus and the height . A comma preceding or denotes partial derivatives with respect to or . The viscoelastic material is constituted by the Kelvin relation with the viscoelastic damping coefficient [27]. The influence of the external damping of the belt is neglected in this study. The boundary conditions of the belt spans are as in the following: The governing equation for the driving pulley, the driven pulley, and the accessory is given by where the dot denotes differentiation with respect to , and , respectively, are the damping coefficient of the rotating of the accessory shaft and the pulleys, and piecewise function is defined as It should be noted that the accessory shaft and the driven pulley remain engaged if the wrap spring without the function of power transfers in one direction. For modeling such engaged state, function is defined as

Incorporating the following dimensionless quantities, the equations of motions (1) and (4) and the boundary conditions (3) can be nondimensionalized as where and and , respectively, represent the effect of nonlinearity of the translating belt and the bending stiffness of the belt.

#### 3. The Nontrivial Equilibrium

In this section, the nontrivial equilibrium is determined via two different ways. At first, the equilibria of the dynamical system are achieved as asymptotic behaviors of a viscoelastic model. Then an iterative scheme is developed for confirming the asymptotic solution.

##### 3.1. The Nontrivial Solutions of Viscoelastic Model

The differential and integral quadrature methods have been applied to study the nonlinear dynamics of continua [26, 28, 29]. In the following, the quadrature methods are applied to numerically calculate the nontrivial equilibrium solution.

In the domain of , is introduced as Chebyshev-Gauss-Lobatto sampling points with points immediate adjacent at both ends for the two belt spans as where and 2. By the quadrature rule, an th-order derivative at and the integral terms in (10), respectively, are written as where is an arbitrary function, represents on the sampling point , and and represent the quadrature weighting coefficients and the integral weighting coefficients, respectively [26].

Substitution of (12) into (8) and (9) yields a series of ordinary differential equations where , and

The physical and geometrical properties of the two-pulley belt-driven system are listed in Table 1 [10, 18, 30, 31].

Based on mesh grid (11) with , the numerical solution is solved from (13) by discretizing the temporal variables with the fixed temporal step 10^{−4}. Besides, the initial conditions for the first calculation are the same for all the following calculations as given below
where and 2, , and represents the amplitude of the belt span’s vibration. It should be noted that is used in all numerical examples. Furthermore, in the following computations if there is no statement.

The transverse displacements of the center of the translating belt spans via the quadrature methods with the boundary condition (9) and the initial condition (15) are plotted in Figure 2 with the axial transporting speed of the belt m/s. In Figure 2(a), the numerical simulations demonstrate that the vibration responses of the belt spans depend on the initial conditions at the beginning phase, then the vibration response gradually decays, and a nontrivial equilibrium of the belt forms finally. Therefore, Figure 2 illustrates that the nontrivial equilibrium solutions can be obtained from the free vibration of the viscoelastic model by using the quadrature methods.

##### 3.2. The Iterative Solution

The nontrivial equilibrium solutions and of (8) in engaged state satisfy where

The boundary conditions of the two transporting belt spans for (16) are as follows:

Substitution of (12) into (16) and (18) yields a series of algebraic equations where and 2. Similarly, substitution of (12) into (17) yields

For solving the algebraic equations (19), an iterative scheme is developed as follows:

Figure 3 shows the comparison of the nontrivial equilibrium between iterative scheme (21) and the free vibration of the viscoelastic model (13). In Figure 3, the number of iteration . Figures 3(a) and 3(b), respectively, depict the comparison of the nontrivial equilibrium of the translating belt span 1 and span 2. As shown in Figure 3, the nontrivial equilibria calculated from two different ways are completely coincident. Therefore, the nontrivial equilibrium solutions of the two-pulley belt-driven system are efficiently determined by using the iterative procedure in conjunction with the differential and integral quadrature methods. In the following investigation, the nontrivial equilibria are all calculated by iterative scheme (21).

The effects of the physical parameters, the speed, and the initial static tension are shown in Figure 4 with the axial speed of the belt m/s. It should be noted that here we only show the nontrivial equilibrium solutions of the belt span 1, as the results of the belt span 2 are completely the same. With the increase of the length of the belt span, the axial speed of the belt, the height of the belt, Young’s modulus of the belt, and the nontrivial equilibrium solutions increase. Meanwhile, with the increase of the radius of the driving pulley and the driven pulley and the initial static tension in the translating belt, the nontrivial equilibrium decreases. Since accounts for the belt bending stiffness, Figures 4(d) and 4(e) illustrate that the nontrivial equilibrium solutions are very sensitive to the belt bending stiffness.

#### 4. Natural Frequencies

Substitution , , and in (8) and (9) in engaged state, where , yields the governing equation of motion measured from the nontrivial equilibrium [32, 33] where The Galerkin truncation will be used to numerically solve the linear equations, correspondingly those nonlinear equations for the natural frequencies under the boundary conditions (23). Omitting damping terms, the nonlinear terms of (22) yield the following linear form with space-dependent coefficients where

##### 4.1. Galerkin Discretization

The Galerkin truncation will be proposed to discretize the equation of motion of the two-pulley belt-driven system into ordinary differential equations. In the present investigation, both the trial and weight functions are chosen as eigenfunctions of a linear nontranslating beam under the boundary condition (23); namely, suppose that the solution of (25) takes the form [6, 34] where ; is the th modal coordinates for the th belt span. After substituting (27) into (25), the Galerkin procedure leads to the following set of second-order ordinary differential equations where

Multiplying the first equation of (28) by weighted function and integrating the product from 0 to 1 yield where where ; ; . Equation (30) can be written in matrix-vector form as where and all coefficients , , and , , are determined by the Galerkin procedure [24, 26, 35]. Nontriviality of solutions to (32) requires its determinant of coefficients to be zero; therefore, the natural frequencies of the dynamical system can be obtained from

###### 4.1.1. Convergence Study

Figure 5 shows the comparisons for the first five natural frequencies of the two-pulley belt-drive dynamical system between different truncation terms. In Figure 5, the natural frequencies are calculated for the different speed of the transport belt. As it is seen from Figures 5(a) and 5(b), the third, fourth, and fifth natural frequencies in engaged state via 6-term Galerkin truncation are bigger than that of 16-term Galerkin method. Meanwhile, the difference of the first two natural frequencies of the dynamical system between 6-term and 16-term Galerkin truncation is quite small. Particularly, the first natural frequencies via 6-term and 16-term Galerkin truncation are almost coincident. Furthermore, the difference between the fourth and fifth natural frequencies via 6-term Galerkin truncation and 16-term Galerkin method is increased with increasing belt transport speed. However, the quantitative difference of the fourth and fifth natural frequencies between 8-term, 10-term, 12-term, and 16-term Galerkin method decreases as shown in Figures 6(d), 6(f), and 6(h). Furthermore, the comparison in Figure 6 demonstrates that 16-term Galerkin truncation method obtains the convergent numerical results for the first five natural frequencies of the pulley-belt dynamical system. In the following numerical examples, the first 16 modes are used for Galerkin truncation method if there is no clarification.

###### 4.1.2. Parametric Studies

Figure 6 describes the effects of the physical parameters and the initial static tension on the first five natural frequencies of the two-pulley belt-driven system. Figures 6(a) and 6(b) show that the effects of the initial static tension on the fourth and fifth modes are greater than on the first three modes. As it is shown in Figures 6(c), 6(d), 6(e), and 6(f), the first five natural frequencies of the pulley-belt system are very sensitive to Young’s modulus and the height of the belt. Particularly, the fourth and fifth natural frequencies are more sensitive to Young’s modulus. Since accounts for the bending stiffness of the belt, the numerical results illustrate that the belt bending stiffness significantly influences the first five natural frequencies of the pulley-belt system. Figures 6(g) and 6(h) depict the effects of the stiffness of the wrap spring between driven pulley and the accessory shaft on the first five natural frequencies of the two-pulley belt-driven system. As shown in Figures 6(g) and 6(h), the wrap spring stiffness only influences the third and the fifth natural frequencies. The comparisons in Figure 6 show that the first five natural frequencies of the dynamical system increase with increasing initial static tension, Young’s modulus, and height of the belt. Meanwhile, only the third and the fifth modes increase with increasing stiffness of the wrap spring.

##### 4.2. Quadrature Methods

In this section, the differential and integral quadrature methods are applied to determine the first several natural frequencies for the discrete-continuous system. Substituting (12) into (8) and (9) yields a series of ordinary differential equations where Suppose that the solution to (35) takes the form Substituting (37) into (35) yields

Equation (38) also can be written in matrix-vector form as (32) with all coefficients , , and , , are determined by quadrature methods [36, 37]. Similarly, the natural frequencies are determined in a similar way to the previous case with Galerkin truncation. Therefore, the natural frequencies of the present dynamical system can be obtained from (34) based on determinant of coefficients of (32) to be zero.

The first five natural frequencies of the pulley-belt system coupled with accessory are shown in Figure 7 based on the differential and integral quadrature methods. Furthermore, the natural frequencies from these quadrature methods are compared for three different numbers of sampling points. The numerical results illustrate that the quadrature methods with sampling points, and 19, deliver the same result. Meanwhile, there is discernible difference between the fourth and fifth natural frequencies based on and 17. Therefore, the numerical results in Figure 7 exhibit that the quadrature methods have good convergence properties for predicting the free vibration characteristics for the present pulley-belt system. Moreover, the quadrature methods with are adopted in the following numerical examples.

In order to verify the validity of the Galerkin method in Section 4.1, Figure 8 describes the comparisons of the first five natural frequencies of the present dynamical system via the quadrature methods and the 12-term and 16-term Galerkin truncation. As it is seen from Figure 8(a), the first two natural frequencies, which are predicted by using the 12-term Galerkin truncation, are very close to that of the quadrature methods. Meanwhile, Figure 8(b) shows that the third, fourth, and fifth natural frequencies predicted via the 12-term truncation are slightly larger that of the quadrature methods. Nevertheless, Figures 8(c) and 8(d) illustrate that the first five natural frequencies via the 16-term Galerkin truncation are very close to those via the quadrature methods. Therefore, the numerical results of the first five natural frequencies via the 16-term truncation are confirmed by the quadrature methods.

#### 5. Conclusions

The equilibria and the free vibration characteristics of a two-pulley belt-driven system connected with greater weight accessory are studied in the present work. Considering the effects of the bending stiffness of the translating belt, the belt is modeled as an axially moving viscoelastic beam. A nonlinear piecewise discrete-continuous model is established for coupling the transverse vibration of the translating belt and the rotation vibration of the pulleys and accessory. The nontrivial equilibriums of the belt are, respectively, numerically calculated by the viscoelastic model and an iterative scheme based on the equilibrium equation. Furthermore, by introducing a coordinate transform, new equations are derived for governing the vibration near the nontrivial equilibrium. The natural frequencies of the pulley-belt system are, respectively, studied via the high-order Galerkin method as well as the differential and integral quadrature methods. The following major conclusions are drawn from this study.(1)The nontrivial equilibrium solutions of the translating belt spans and the first five natural frequencies of the dynamical system are both very sensitive to the belt bending stiffness.(2)The first five natural frequencies of the pulley-belt system are increasing with the initial static tension, Young’s modulus, and the height of the belt. On the other hand, only the third and the fifth modes are influenced by the stiffness of the wrap spring.(3)The numerical results demonstrate that 16-term Galerkin truncation delivers the convergent results for the first five natural frequencies of the pulley-belt system. Moreover, the first five natural frequencies, which are predicted by using the 16-term Galerkin truncation and the quadrature methods, are almost the same.

#### Conflict of Interests

The authors declare that there is no conflict of interests regarding the publication of this paper.

#### Acknowledgments

The authors gratefully acknowledge the support of the State Key Program of National Natural Science Foundation of China through Grant no. 11232009 and the National Natural Science Foundation of China through Grant nos. 11372171, 11272166, and 11002075.

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