The Decision-making Design Study on Sewing

The Decision-making Design Study on Sewing

The speed of the new product development in
sewing machine industry is slow. Due to the influence of the
general situation of sewing industry, time and funds,
combined with the uncertainty of the development result,
the enterprises find hard to make decision on how and when
to develop their new products or improve old ones, though
they have eager and strong desire. To meet the very
demands, the article introduces the QFD, sets up the house
of quality, and ensures the best group of the improvement
measures and contribution under the restriction of the cost.

Permanent magnet synchronous motor (PMSM) servo
drive system has been widely used for industrial sewing
machines. The conventional control method is PID, which has
some disadvantages such as large overshoot, bad robustness. In
this paper, a servo control of the industrial sewing machine
system based on the active disturbance rejection control (ADRC)
is proposed, which can arrange the transient process, estimate
and compensate the uncertain internal and external disturbance.
It can highly enhance the dynamic performances of the system.
Based on the Matlab/simulink software, the simulation results of
the industrial sewing machine control system proved the
effectiveness and robustness of the ADRC control strategy

The PID control is one of the early developed control
strategies. Due to its simple algorithm, good robustness and
reliability, it has been widely used to design position, speed
and electric current loop controller in industrial sewing
machine servo system. And classic PID control based, such as
increment PI control, fuzzy PID control, Neural PID control ,
multi-segment PI control are also adopted[3,4]. However, the
classical control strategies have some disadvantages, such as,
large overshoot, long adjustment time and so on. It is difficult
for the PMSM servo system to realize high precision control.
PMSM servo system is a typical non-linear time-variant
control system. Many intelligent control methods such as
fuzzy control, self-adaptive control, neural network control,
sliding mode variable structure control, genetic algorithm
control are adopted to solve the problems. Many scholars have

done a lot of meaningful researches on these control methods
[5,6]. But it still has some difficult to realize.
The ADRC can not only arrange the transient process, but
also estimate and compensate the total disturbances on the
system, which can highly improved the performance of the
PMSM servo system. In this paper, ADRC is used as a speed
loop regulator in the industrial sewing machine servo control
system[7,8]. Simulation results indicated that, compared with
conventional PID control servo system, the proposed control
method has better dynamic performance, and stronger
robustness to the system disturbance.vs enterprises

The Decision-making Design Study on Sewing

The position control of the industrial sewing machine
system based on the ADRC is shown in Fig.2. Proportional
control is adopted to the position loop, and the PI control is
adopted to the current loop. Simulation results have been done
in the Matlab/simulink. The parameters of PMSM are as
follows: np=2, Rs=3.4 Ω, Ld=8.317 mH, Lq=5 mH, J=0.8*10-3
kg.m2, ψf=0.175 Wb. The ADRC parameters are chosen as
follows: 0 k =10, p k =2.0, i k =6.6, 21 k =1200, 22 k =15000,
0.5 0 1 a = a = , 0.05 0 1 δ =δ = , b=10000, TL=5 N.m.
show the dynamic and steady state
performance of the servo control of the industrial sewing
machine based on the ADRC of the speed loop. The expected
speed isω =1300(r /min) , and the stop position is 21000 rad.
shows the speed curve of the rotor. From which we
can see that the speed of the system has no overshoot, and the
system has a good dynamic response. is the curve of
rotor position, which shows that the ADRC control system has
high precision in servo control. shows the
electromagnetic torque of the PMSM.shows the
transient process of the expected rotor speed arranged by the
TD of ADRC. is the rotor speed estimated by the ESO of
the ADRC.

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