Ball Balancing on a Beam

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1 1 Ball Balancing on a Beam Muhammad Hasan Jafry, Haseeb Tariq, Abubakr Muhammad Department of Electrical Engineering, LUMS School of Science and Engineering, Pakistan { , }@lums.edu.pk, abubakr@lums.edu.pk Abstract In this paper, the problem of balancing ball on a beam at reference locations has been analyzed in detail. The dynamics of the system are taken into account by starting from the vary fundamentals of mechanics and electro magnetics. The design and construction of ball-on-a-beam balancing apparatus has also been discussed, along with the sensor and control design needed to balance a ball on a tilting beam. First, the motor and beam must be controlled in an inner loop to a crossover frequency much higher than expected for the ball. Then, the outer loop is designed to compensate for the dynamics of the ball. Essentially, the controller must deal with two double integrators, the inertias of the ball and beam, and that of the ball. I. INTRODUCTION Balancing is essential in carrying out robotic tasks such as transporting dynamic system. [1] There are a lot of very similar applications and Ball balancing on a tilting beam has remained a favorite for Control enthusiasts to study and test their experiments. It is inherently a nonlinear dynamic system which is quite difficult to control as it has a lot of issues, for example it involves delayed feedback associated with control actions; and the jumping ball phenomenon bringing sensor uncertainty. However, it is considered to be a classic control problem; the researchers benchmark it to test other control algorithms. Numerous control techniques have already been developed that are currently available in the literature. [2]. A. Background The objective of ball balancing on a beam is to use an actuator to command a tilt angle on the beam and balance the ball, which rolls in one dimension along the beam, at different reference locations, as prescribed the user. The ball position is unstable in open loop, and so a feedback loop is usually employed with some suitable controller to control the ball position, and minimize the error. II. THEORETICAL MODEL OF PLANT The objective of ball balancing on a beam is to use an actuator to command a tilt angle on the beam and balance the ball, which rolls in one dimension along the beam, at different reference locations, as prescribed the user. The ball position is unstable in open loop, and so a feedback loop is usually employed with some suitable controller to control the ball position, and minimize the error. 1 Submitted to the Department of Electrical Engineering on Dec 6, 2013 as course project for Digital Control Systems A. Modeling of Ball and Beam System The dc motor causes the beam to turn by an angle θ, which causes the ball to roll along the beam. The practical setup is the same as used by Amjad et al [3] and the system is shown in figure 2. By applying Newtonian mechanics, the forces and torques acting on the system can be shown and the dynamics understood. There are three main components that have moments and forces acting on them: the motor, the beam, and the ball. To simplify the derivation, the motor shaft and beam are considered to be a rigid body (i.e. the stiffness across the transmission is infinite), and centripetal acceleration is ignored. The pivot of the beam is also assumed to be near the plane of ball contact, and there is no skidding. Fig. 1: Free Body Diagram of Ball-on-Beam System The Lagrangian equation of motion for the ball is then given by the following: ( ) J 0 = R 2 + m r + mg sin θ mr θ 2 Linearization of this equation about the beam angle, θ = 0, gives us the following linear approximation of the system: ( ) J R 2 + m r = mgθ Taking the Laplace transform of the equation above, the following equation is found: ( ) J R 2 + m R(s)s 2 = mgθ(s) Rearranging we find the transfer function from the motor shaft angle (θ(s)) to the ball position (R(s)). P (s) = R(s) Θ(s) = mg ( J R + m ) 1 s 2 [ m rad ] 2 The constants for our system were: Mass of the ball = m = kg

2 2 Fig. 2: Free Body Diagram of DC Motor Radius of the ball = R = meter Gravitational acceleration = 9.8 m s 2 Ball s moment of inertia = J = (2/5)M(R 2 ) = Kgm 2 Our final transfer function for the ball and beam plant becomes, P (s) = R(s) Θ(s) = s 2 B. Modeling of DC Motor [ m rad ] A common actuator in control systems is the DC motor. It directly provides rotary motion and, coupled with wheels or drums and cables, can provide translational motion. In most conventional laboratory ball on beam setups a servo motor is employed to provide the angle control of the ball and beam plant. This paper considers the additional complexity that is introduced into the model by disregarding the servo assumption and considers the case when a simple DC motor is used to control the angle of the beam. Essentially the DC motor has to be controlled in a feedback loop to mimic a servo motor and provide a responsive and accurate angle control of its shaft. A simplified model of the DC motor [4] is given as: K s(τs + 1) Where K and τ are the DC-gain and the mechanical time constant of the motor respectively. However this model does not accurately represent the dynamics of an actual motor as it is an over damped system and shows none of the overshoots and transients typically in the closed loop response of a real DC Motor. Though these transients have no bearing in most applications where torque requirements are the real constraint but in this case where the plant is sensitive to the slightest of overshoots in the input angle, the need for a more accurate representation of the DC motor arises. 1) Improved Model of DC Motor: To incorporate the appearance of the transients in the motors position we build our model from the very basics of a DC motors electrical and mechanical characteristics. The electric circuit of the armature and the free-body diagram of the rotor are shown in fig. 2: The input to the system is the voltage applied to the motor s armature (V ), while the output is the angular position of the shaft (θ). The relevant physical parameters that define the dynamics of our motor are: Fig. 3: Motor Specifications of DME37SB (J) Moment of inertia of the rotor (b) Motor viscous friction constant (K e ) Electromotive force constant (K t ) Motor torque constant (R) Electric resistance (L) Electric inductance These constants are derived from a set of empirical specifications of a DC motor most of which are commonly found on the datasheet of the motor. The motor in this model was the DME37SB whose specifications are as shown in fig. 3 The parameters of interest are the rated voltage V r, rated torque T r, rated current I r, stall torque T s, no load current I n and rated speed ω r all of which can be read off the datasheet. The stall current Is though not specified is easily measured experimentally. Our motor constants are then calculated as shown: R = V r I s T s K t = (I s I n b = (K t I r ) T r ω r K e = V r (I r R) ω r Once the motor constants are specified Newton s and Kirchoff s laws can be applied to the motor system to generate the following equations. [5] J d2 θ dt 2 = T bdθ dt = d2 θ dt 2 = 1 J (K ti b dθ dt ) L di di = Ri + V e = dt dt = 1 L ( Ri + V K dθ b dt ) These equations can be modeled as a block diagram in Simulink Matlab by using integrators, summers and gain blocks. The complete DC motor model in Simulink is shown in fig. 4:

3 3 and robust so as to not be easily excited into instability, and must also have good disturbance rejection. The disturbance rejection should compensate for the torque that the ball mass applies as it moves away from the center. To begin, a block diagram for the closed loop system was constructed as shown in fig. 6. In this system there are only two sensors available: the motor angle sensor and the ball position sensor. Therefore, there should be two closed loops, an inner motor loop and an outer ball position loop. Another intermediary loop sensing the beam angle would be beneficial in making the control and tuning of the system easier, but this loop is unnecessary and was not implemented in this project. Fig. 4: Simulink Model of DC Motor This gives us our complete model for the motors position control. 2) Alternative Models: The Simulink model can then be discretized by performing an input output linearization of the DC motor system. This operation is handled through the Matlab Linear Analysis Tool which gives us a linearized discrete transfer function representation of the DC motor which comes out to be: θ(s) V (s) = ( ( 4))(z )(z ( 8)) z(z 1)(z 0.968) The differential equations can also be expressed in statespace form by choosing the motor position, motor speed and armature current as the state variables. Again the armature voltage is treated as the input and the rotational position is chosen as the output. θ θ 0 d dt θ = 0 b K J J θ + 0 V i 0 K L R 1 L i L θ y = [ ] θ i The open loop frequency response of the DC motor position model is also shown in fig. 5 which shows the gain margin, phase margin and crossover frequency. The crossover frequency which indicates the speed of the dynamics the plant is of particular interest because a crossover frequency at 3Hz indicates that a sampling frequency of 1000Hz is more than enough to accurately sample the DC motors response. Fig. 6: Block Diagram of Closed Loop Ball-on-Beam System. An inner loop controls the position of the motor, while the outer loop controls the position of the ball along the beam A. Controller for DC Motor The design parameters of the controller adhere to the realistic performance expectations of the system. For this application, a series of lead compensators were chosen to counteract the abundance of open loop poles and improve transient response. An integrator with a 0.5s time constant was included in the motor loop to diminish the off-horizontal error of the beam and increase disturbance rejection. The integrator transfer function is, G mi (s) = 0.5s s This transfer function in z-domain becomes, G mi (z) = 1.001z z 1 III. CONTROL DESIGN To have the ball properly track a position command, a controller must be designed. The controller must be reliable Fig. 5: Open Loop frequency Response of model of DC Motor

4 4 Fig. 7: Closed Loop Simulink Model of DC Motor. An inner loop controls the position of the motor along with the controller and the delays incorporated To make the motor loop effective to control the ball loop, the motor loop also had to have a considerably higher bandwidth than the ball position loop. Therefore, the realistic crossover frequency of the motor loop, ω m, was arbitrarily chosen at about 25 Hz (158 rad s ). The lead compensator, G ml for the motor was thus designated as: G ml (z) = 19.98z z 0.9 The integrator transfer function combined with the motor lead compensator became the motor controller, Fig. 8: Overall Closed Loop Response of DC Motor with compensator B. Controller for Ball and Beam System After modeling the ball and beam system and the dc motor, and designing controller for the DC motor, the entire system was put together as shown in fig. The simulink model (as shown in fig. 9) of the system also incorporated the delay due to the second sensor i.e. the sharp sensor. This was modeled using a zero order hold of second. G mc (z) = 20(z ) z 0.9 The final transfer function of controller was included in the feedback loop of DC motor. Delays due to zero-order hold while providing input to the real-world system were incorporated, as well as the delays due to the delay in the sensor output of potentiometer. Dead zone was also given its weight-age by employing it at the output of the controller. A limiter was also put on the input of the plant, so that only realizable voltage levels (max 24 Volts, min -24 Volts) are sent as input to the plant. The final simulink model looked as shown in fig 7. The design constraints that were kept in mind while designing controller were as follows: Rise time: 0.05 sec Settling time: 0.25 sec Overshoot: 5 percent No steady state Error Bandwidth must be significantly larger than overall ball and beam system. The output of the closed loop system for DC Motor as shown in fig 8 met the requirements that were set for it quite easily. Fig. 9: Overall closed loop model in Simulink of Ball and Beam Experiment The controller designed for the entire ball and beam system was meant to achieve the desired ball and beam position system as soon as possible, keeping in mind the system could not get more fast than the inner loop of DC motor, as that would create instability. However, the controller needed to be robust against disturbance, and allow the system to achieve all possible ball locations on the beam. After a lot of consideration, and hit-and-trial method, the following controller was chosen: P (z) = 725z z 0.9 The response of the system in closed loop after incorporating this controller met the required conditions, as shown in fig. 10. The rise time was sec, settling time was 9 sec (a little slow), and overshoot was just 5 percent.

5 5 Fig. 10: Overall response of closed loop model of Ball and Beam Experiment meeting the required conditions IV. SENSOR ISSUES The biggest difficulties encountered in this project were introduced by the unreliability of the ball position sensor. Because this sensor measured the system output, it was the most critical component of the apparatus. If the position of the ball was not exactly known, the position could not be precisely commanded. [6] Noise that was introduced through this sensor severely paralyzed the performance of the overall system. Signal dropout occurred intermittently as the ball rolled along the beam. Without a proper position measurement, control was impossible. A significant amount of time was spent testing various sharp sensors available and debugging them. A. Tested Ball Position Sensors The values of sharp sensor output were plotted against the distance, and after curve fitting on Matlab, the following expression was obtained. V d = d d d where, d is the distance from the sharp sensor to the ball along the length of the beam, and V d is the output voltage provided by the sharp sensor at that specific distance d. Fig. 12: Output of Potentiometer with change of angle of beam B. Tested Potentiometer Similarly, the values of potentiometer output were plotted against the angle, and after curve fitting on Matlab, the following expression was obtained. V θ = ( 7) θ ( 7) θ ( 3) θ where, θ is the angle covered by the team, taking horizontal line as θ = 0, and V θ is the output voltage provided by the potentiometer at that specific distance θ. V. FUTURE WORK Besides researching different sensors and determining which technique is most advantageous for this application, there are other possible areas of improvement. The mechanical design of the apparatus is an area that affects the performance of the system, but it should be noted that a relocation of the center of gravity and a decrease of overall dimensions could reduce material and cost. Two other main areas that could be redesigned are the controller and the transmission mechanism. The controller can be fine-tuned and even converted to analog control and the transmission mechanism can become more rigid or be eliminated. REFERENCES Fig. 11: Output of Sharp Sensor plotted against the length of the beam [1] J. Hauser, S. Sastry, and P. Kokotovic, Nonlinear control via approximate input-output linearization: The ball and beam example, Automatic Control, IEEE Transactions on, vol. 37, no. 3, pp , [2] E. A. Rosales, A ball-on-beam project kit. PhD thesis, Massachusetts Institute of Technology, [3] M. A. Rana, Z. Usman, and Z. Shareef, Automatic control of ball and beam system using particle swarm optimization, in Computational Intelligence and Informatics (CINTI), 2011 IEEE 12th International Symposium on, pp , IEEE, [4] P. H. Eaton, D. V. Prokhorov, D. C. Wunsch, et al., Neurocontroller alternatives for?fuzzy? ball-and-beam systems with nonuniform nonlinear friction, Neural Networks, IEEE Transactions on, vol. 11, no. 2, pp , 2000.

6 [5] L.-X. Wang and J. M. Mendel, Fuzzy basis functions, universal approximation, and orthogonal least-squares learning, Neural Networks, IEEE Transactions on, vol. 3, no. 5, pp , [6] S. Sastry, Nonlinear systems: analysis, stability, and control, vol. 10. Springer New York,

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