The filament winding technique has evolved in recent decades moving from classical
lathe-type towards winding with an increased number of degrees of freedom using more
complex equipment. These advancements complicate the selection of an optimum
toroid winding machine
set-up for the realization of particular winding methods and correlating part designs. This
is further complicated by the variety of approaches. In order to investigate existing
equipment technologies regarding feasibility, operational and economic aspects, different
filament winding equipment is established in an experimental environment. Thereby
advantageous solutions can be assigned to particular winding methods and the selection of
appropriate filament winding equipment is facilitated.
Filament winding has emerged as the main process for carbon fiber reinforced plastic
(CFRP) fabrication, and tension control plays a key role in enhancing the quality of the
winding products. With the continuous improvement of product quality and efficiency, the
precision of the tension control system is constantly improving. In this paper, a novel
tension control method is proposed, which can regulate the fiber tension and transport
speed of the winding process by governing the outputs of three different driven rollers
(the torque of the unwind roll, the torque of the magnetic powder brake roller, and the
speed of the master speed roller) in three levels. The mechanical structures and dynamic
models of the driven rollers and idle rollers are established by considering the time-
varying features of the roller radius and inertia. Moreover, the influence of parameters
and speed variation on fiber tension is investigated using the increment model.
Subsequently, the control method is proposed by applying fiber tension in three levels
according to the features of the three driven rollers. An adaptive fuzzy controller is
designed for tuning the PID parameters online to control the speed of the master speed
roller. Simulation is conducted for verifying the performance and stability of the proposed
tension control method by comparing with those of the conventional PID control method. The
result reveals that the proposed method outperforms the conventional method. Finally, an
experimental platform is constructed, and the proposed system is applied to a
gear
toroidal winding machine. The performance and stability of the tension control system
are demonstrated via a series of experiments using carbon fiber under different reference
speeds and tensions. This paper proposes a novel tension control method to regulate the
fiber tension and transport speed.
High modulus carbon fiber is an excellent industrial material, which is widely used in
several fields such as satellite supporting cylinder, shells of rocket engine, and solar
array. The composite manufacturing process is the key to the application of carbon fiber.
Filament winding has emerged as the main process for fabricating composite structures. It
is widely used in building rotational parts. In the filament winding process, the carbon
fiber is delivered from the unwind roll and passed through the resin bath to mix with resin
under different temperatures and finally wrap around the surface of the mandrel in the
designed pattern. The major specifications that should be satisfied during the winding
process are the winding line type and the fiber tension, which are considered to be the key
factors related to the tensile strength of the fiber products. The winding line type is
determined using the numerical control system, so this paper focuses on the tension control
problem during the winding process. Researchers have shown that unstable tension may lead
to loss in strength of fiber winding products [1]. Therefore, fiber tension should be
maintained at the reference value during the winding process for ensuring the product
quality.
Several factors shape the tension control design to be challenging, which include
significant parameter variations and disturbances. Small variations in the change of
velocity of the transport rollers can cause significant variations in tension. On the other
hand, we used different shapes of mandrels for maintaining the line speed in acceleration
or deceleration states. Because of the coupling between the tension and the line speed, it
is difficult to maintain the tension at a desired value. Researchers have investigated
considerably for acquiring better control result. Lee et al. [2] used a magneto rheological
brake to provide back tension to prevent frequent part changes and fatal malfunction for a
tension control system, and a PID controller was designed, and test results showed the
feasibility with satisfying the time constant and the allowable error. Nishida et al. [3]
divided the transport system into several subsystems and a self-tuning PI controller with
an estimator based on a novel adaptive particle swarm optimization method was constructed
to solve the strong coupling between the velocity and tension of the web. A self-tuning PID
controller to control the tension for tape winding of composites was designed and the
constant extension ratio is guaranteed. To reduce the time required for the stabilization
of the tension, a faststabilization method [4] for web tension is proposed. The model of
dancer system and stabilization of web tension in drying process are established, and the
variation of tension is used as a reference value for the tension stabilization. The
integration of load cells and active dancer system for printed electronics applications was
used to improve the accuracy of web tension, and self-adapting neural network control was
proposed to reduce tension spikes due to the change in roll diameter of winder and unwinder
rolls. Wu et al. [5] developed a tension detection and control mechanism and analyzed the
main causes of wire tension variation, and then a PI algorithm was proposed to reduce
tension variation. An accurate dynamic model for the unwind roll by considering the time
variation of the roll inertia and radius was developed, and a decentralized controller for
computing the equilibrium inputs for each driven roller was proposed [6]. A sliding mode
control with guaranteed cost technique [7] was applied for reducing the system
uncertainties. The simulation results showed that the proposed method had good robustness
and quick response time. Compensation method [8] by calculating the torque of a driven loop
lifter was developed to control the tension and thickness of hot-rolled strip. For the
control strategy, several control methods have been proposed including disturbance
rejection control [9,10,11,12], neuro-fuzzy control [13,14,15,16], and H∞ control
[17,18,19]. Choi et al. [20] conducted a survey on various types of control algorithms by
investigating their strengths and weaknesses, and demonstrated some areas of potential
future development.
Most of the above studies considered the dynamics of driven rollers in the models but
the behavior of idle rollers was ignored. Consequently, the models were under some limited
conditions, which ignored detailed complex tension dynamics. On the other hand, most
research focused on dynamic modeling and control strategy design, but the mechanical
structure and the influence of parameter variation on fiber tension were ignored. In this
paper, a novel tension control method is presented, which can regulate the tension and
speed of the filament winding process. The mechanical structure and dynamic model of the
system are established, and the influences of the parameter and the speed variation on
fiber tension are examined. Subsequently, according to the features of driven rollers and
the influence of variation, the control method is proposed by regulating the outputs of the
torque of unwind roll, the torque of magnetic powder brake roller, and the speed of the
master speed roller in three levels. Simulations are conducted for verifying the effect by
comparing the results with those of the conventional PID controller. Finally, the
performance of the proposed control system is verified through experimental studies using a
filament slider coil winding machine.
The structure of the paper is organized as follows. Section 2 presents the mechanical
structure of system. In addition, the dynamic models are constructed, and the influence of
parameter and speed variation on the rollers is examined. In Section 3, the control
strategy is proposed. Simulations are conducted for verifying the effect of the proposed
controller by comparing with that of the conventional PID controller in Section 4. In
Section 5, the proposed mechanical structure and control strategy are applied to a
belt
head winding machine, and the experimental study is conducted for verifying the
performance of the tension control system.
The process line is divided into three zones (Figure 1): the unwind section, the
process section, and the rewind section. In each zone, one or two rollers are driven using
motors for transporting the carbon fiber from the unwind roll to the rewind roll. The
carbon fiber is delivered from the unwind section to the process section, which consists of
the magnetic powder brake roll, the master speed roller, and some idle rollers. In the
process section, the carbon fiber passes through the surface of the master speed roller. As
the carbon fiber is comprised of thousands of threads, the resin is properly pasted on the
surface of the carbon fiber. The master speed roller is driven using an AC servomotor, and
the speed is controlled for acquiring the desired speed and tension. The rewind section
consists of a four-axis CNC system for acquiring the winding pattern.
The control method of hook type winding machine is shown in Figure 2 in
three levels. The control system can regulate the tension and speed of the filament winding
process by governing the output of three different driven rolls—the torque of the unwind
roll, the torque of the magnetic powder brake roller, and the speed of the master speed
roller. In the first level, the unwind roll, which is driven using a torque motor generates
a reverse force for applying a pretension to the carbon fiber. The pretension is set at a
small value because large tension will cause the tension to deviate from the set point
owing to the time-varying radius and the disturbance caused by the periodic swing. In the
second level, the magnetic powder brake generates another pretension to the carbon fiber.
The feature of the magnetic powder brake is to generate torque in a wide range without
introducing considerable tension interference. However, its disadvantage is that the
accuracy and response speed are inadequate than the speed control using the AC servomotor.
Finally, in the third level, as the tension is close to the set value, the master speed
roller is controlled for acquiring the desired tension. On one hand, the speed of the
master speed roller traces the line speed of the carbon fiber as the reference speed. On
the other hand, the speed is adjusted for maintaining tension at a desired value. The
response speed is high when the AC servomotor operates in the speed control mode.
Consequently, when the line speed of the carbon fiber changes rapidly or in the start-time
period, the master speed roller maintains tension in a small range. The control system
measures the speed and tension of the carbon fiber, and then controls the multivariable
output of the torque of the unwind roll, the torque of the magnetic powder brake roller,
and speed of the master speed roller. The mechanical structure and dynamic modeling of the
system is presented as follows.
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