A fast, accurate, low-cost pneumatic control system in which the actuator can be programmed off-line to stop at any required position in its travel without the use of mechanical stops is described. A dual-mode control scheme switching two on/off valves is used. The system is able to position a 37 kg inertia load to within ± I mm at any point on a 300 mm stroke in less than a second.
References
1.
DrazanP. J.JefferyM. F.ZarekJ. M.Recent developments in the design of a novel electro-pneumatic robot. Proceedings of Second International CISM IFT-o-MM Symposium on Theory and practice of robots and manipulators, Jadwisin, Poland, 14-17 October 1976, pp. 143–150.
2.
DrazanP. J.ThomasP. B.Simulation of an electropneumatic manipulator system. Fifth International Symposium on Fluid power, Durham, 13-15 September 1978. paper C5, pp. 59–72 (BHRA Fluid Engineering, Cranfield, Bedford).
3.
NguyenH. T.PachnickeE.AndersP.Servo pneumatic cylinder drive for positioning tasks (in German). Sixth Aachen Colloquium on Fluid Technology, 27-29 March 1984, Vol. 3, pp. 137–157.
4.
BackeW.The potentialities of pneumatics in manipulation and handling techniques (in German). Technica, 18 November 1987, 36(24), 19–24.
5.
WestonR. H.MooreP. R.ThatcherT. W.MorganG.Computer controlled pneumatic servo drives. Proc. Instn Mech. Engrs, Part B, December 1984, 198, 175–281.
6.
NagarajanR.WestonR. H.Front end control schemes for pneumatic servo driven modules. Proc. Instn Mech. Engrs, Part B, 1985, 199(B4), 271–277.
7.
MooreP. R.SsenkungoF. W.WestonR. H.ThatcherT. W.HarrisonR.Control strategies for pneumatic servo drives. Int. J. Prod. Res., 1986, 24(6), 1363–1382.
8.
PuJ.WestonR. H.Motion control of pneumatic drives. Microprocessors and Microsystems, September 1988, 12(7), 373–382.
9.
SmithM. C.The positioning of a low friction pneumatic actuator using on-off control. PhD thesis, 1987, University of Edinburgh.
10.
LinnettJ. A.SmithM.C. Low friction pneumatic actuators for accurate robot control. International Conference on Computeraided production Engineering, Edinburgh, April 1986, pp. 287–292 (Mechanical Engineering Publications, London).
11.
MannetjeJ. J.Pneumatic servo design method improves system bandwidth twenty-fold. Control Engng, June 1981, pp. 79–83.
12.
BognorI.KazdaL. F.An investigation of the switching criteria for higher order contactor servomechanisms. Trans. Am. Inst. Electl Engrs, 1954, 73(2), 118–127.
