Control System of Grain Circulation Fumigation Based on Agent

Transcription

1 Sientifi Journl of Control Engineering My 27, Volume 7, PP.-8 Control System of Grin Cirultion Fumigtion Bsed on gent Jun Xue,2, Linli Zhou,, Lei Liu, Yue Wu. Institute of Intelligent Mhines, Chinese demy of Sienes, Hefei, 233, Chin 2. University of Siene nd ehnology Chin, Hefei, 2326, Chin Emil: bstrt he system of grin depot irultion fumigtion is designed bsed on gent model nd tehnology. he system inluding upper omputer nd slve ontroller, linked with intelligent sensing nd exeution equipment, is integrted into the omplete gent, whih is ombined with struture of deliberte gent. Close loop ontrol system of given prmeter is built by integrting the gent nd the internl environment of grin depot. It n be relized tht remote ontrol of phosphine sprying devie, pipeline vlve of the devie in timing nd quntittive wy. It is lso solved tht remote monitoring nd utomti regultion of phosphine s onentrtion t the severl key positions in the depot. Menwhile, it is overome tht remote surveillne nd dustment given prmeters of temperture & humidity in the grin depot. he fesibility nd operbility of the ontrol system for the remote monitoring of losed loop fumigtion were verified by experiments, whih will be pplied to build the lrge multigent intelligent unmnned wrehouse system. Keyword: gent; Intelligent Grin Depot; PLC; he Closed Cirultion Fumigtion INRODUCION Closed irultion system onnets to fn, pplitor, gs diffuser (dut) nd grin bulk of losed system in [2]. hrough the ompression of the fn mhine, the gs of fumigtion is trnsported to the wrehouse in [3]. It is diffiult to reple phosphine with other gents tht re used for fumigtion ommonly in [9]. Green et l pointed out tht the phosphine ould be used to fumigte when the speed of the smll power wind turbine is less thn 4 m/s nd in [5] the pressure vlue of the pipeline work is kp fter studying on hrteristis of phosphine in 984. t the sme time, ustrli developed fumigtion tehnology lled the ir of Siroflo nd Siruo irultion by using the ylinder filling in [4]. Grin monitoring nd mngement gent system is estblished with integrting utomtion nd intelligent equipment. In the field of rtifiil intelligene, gent is defined s n entity tht hs the bility to pereive, solve problems nd ommunite with the outside world. In [4], gent n be used to estblish number of system ontrol model. Go Liying used intelligent gent tehnology in urbn trffi signl ontrol methods to strt the study ording to [6]. With the help of gent theory nd tehnology, Mo Xinun thought the onstrution nd implementtion of the softwre system n be support in []. Li Zhokun studied the grnry monitoring system bsed on King view nd CN bus, fousing on solving the problem of mny points monitoring unified disply in []. he temperture nd humidity ontrol system of grin wrehouse bsed on PLC were designed by Co Yongzhn et l in [8]. PLC ws used to ollet the informtion of temperture nd humidity in the brn, nd it ws relized tht the on-line monitoring nd intelligent ontrol of the ommunition with the host omputer in [2, 5]. Bsed on the bove reserh nd pplition of relted tehnologies, new gent system is designed. 2 DELIBERIVE GEN SRUCURE MODEL 2. Externl Environment of gent Mthemtil Model Delibertive gent struture is model with expliit symbol bsed on knowledge whih is lso lled ognitive gent - -

2 in []. he losed loop fumigtion is set s ognitive gent model whih environment setting for known inside nd externl seed grin environment tht intert with gent ognitive through the tutor output, sensor input. gent Preset vlue Host omputer dtbse Stte estimtion Output of deision Deision-mking Intelligene Fusion tutor Grin environm Sensor FIG. HE BLOCK DIGRM OF HE COGNIIVE GEN MODEL OF CLOSE LOOP FUMIGION SYSEM he blok digrm of the ognitive gent model is shown in Figure. hrough sensors tking grin environmentl informtion nd the internl informtion fusion, the gent generte modifition of the urrent stte desription in []. fter stte udgment, the defult vlue of ustomer is trnsferred to ontroller from the upper omputer knowledge bse. Under the guidne of the trget, the exeutive tion influenes the vlue of environment to the preset gol tht enter the next round of gent yle though sensors. 2.2 Estblishment of gent Mthemtil Model ssuming tht the irultion fumigtion monitoring system is the gent ( ), fing to the environment of the seed grin internl zone is ( E ) nd outer zone is ( E ). ording to the ondition of the environment E, the stte of performne of is S nd ording to the ondition of the environment E, the stte of performne of is S. ssuming tht lotion point in grin depot is i, stte point set is S i, whih ontins onentrtion i, temperture t i, humidity m i, tht is S i = { i, ti, mi} ; ssuming tht lotion point in grin depot is, stte point set is S, whih ontins onentrtion, temperture t, humidity m, tht is S = {, t, m }. So sttus set of internl environment, 2... i... S = { Si, Si, Si} = t t2... ti... (2.) m m2... mi... he stte set of the externl environment, S = { S, S2... S } = t t2... t... (2.2) m m2... m... Defining S s referene stte, Ss influene stte of, s environment tion of, nd ssuming n motion prmeters of tutor,inluding k, k2, k3, s k, so tutor (solenoid vlve) of the tion prmeters = { 2... k }, tutor 2 (fns) of the tion prmeters 2 = { k }, 2 tutor 3 (eletri push rod) of the tion prmeters 3 = k }, tht is, C = { hen funtion mpping: tion : S 3 { k... } = k... (2.3) PID k3...

3 Setting funtion: ˆ = f ( S S), where Ŝ is preset vlue, S ˆ = {ˆ, tˆ, m ˆ }. Order: { } { } hen: S =, t, m, S =, t, m { = f ( 2, 3 } = ˆ) f ({ t, m } {ˆ, t m ˆ }) ording to mthemtil model, losed loop fumigtion system monitoring nd ontrolling n be relized by lling system prmeters. 3 OVERLL DESIGN OF FUMIGION SYSEM gent of seeds losed loop fumigtion onsists of their subsystems, inluding fumigtion system, temperture nd humidity monitoring system nd mn-mhine intertion ontrol system. s the prtil exeution nd detetion system of losed loop fumigtion gent, fumigtion system hs mny exeutive genies, inluding the vlve equipment, sprying swith equipment, phosphine test genies. he irultion equipment is omposed of the min prts of the wind turbine, the irultion pipe, the ir dut of the inner brn. he fumigtion n be relized vie gs long irultion pipeline into the wrehouse ourred vi delivery devie. Fumigtion system is ompleted by onnet vlve to fn pipe, s shown in Figure 2. Controller ontrols the gs pipeline vlve while gs detetor forms eletril signl feedbk to ontrol iruit. (2.5) FIG.2 SCHEMIC DIGRM OF WREHOUSE FUMIGION 3. emperture nd Humidity Monitoring System emperture nd humidity monitoring system is prtil tutor nd detetion equipment of fumigtion gent. emperture nd humidity ontrol of the detetion equipment is minly omposed of temperture nd humidity detetor, mthing iruit. he sensors tht it s probe deep into the seed below the level of follows nd distribute rry form reflet the whole brn temperture nd humidity of the sitution. he tutor is omposed of two fns nd four eletri putters. When the vlue of the temperture humidity is too high, the fns nd the eletri pushes re open in order to ventilte nd tke breth. Otherwise, the fns nd the eletri pushes re losed when the vlue is too low. t the sme time, when the fumigtion is finished, the fns nd the doors re open for the phosphine gs is dispersing rpidly. 3.2 Mn-mhine Intertion Control System Fumigtion gent regrds host omputer nd PLC slve omputer s the lyer of deision-mking plnning nd informtion fusion. Upper ompute is responsible for the disply of temperture, humidity M, phosphine onentrtion of C, devies whether is open or not to the opertor, menwhile enble the opertor to mnully ontrol the devie in the entrl ontrol room. he utomti ontrol of the preset vlue of H3P gs onentrtion nd the temperture nd humidity nd mnul ontrol of host ompute re relized by the PLC slve omputer while sending the sensor dt to the host omputer through the wireless devie

4 he ontrol priniple of the whole system is shown in Figure 3. he host omputer dopts Modbus ommunition protool on softwre nd RS-485 bus on hrdwre. In the whole monitoring proess, it n be relized by host PC ess PLC, wireless devies onneted, ontroller memory ell. 3.3 Control lgorithm Design FIG. 3 CONROL PRINCIPLE DIGRM OF HE CLOSED LOOP FUMIGION Control lgorithm is the fumigtion gent mpping of tion whih dependent vrible ontins nlog vlve opening, opening nd losing of fn 2, opening nd losing of eletri push rod 3. ording to experiene, we use PI ontrol lgorithm for, s the flow hrt shown in Figure 4. e( t) = u( t) = K p[ e( t) + i e( t) dt] Where detetion onentrtion, setting onentrtion, the devition of test vlue nd given vlue e (t), ontrol volume u (t), rtio oeffiient K p, differentil time oeffiient i. he formul is the superposition of inrementl lgorithm nd position lgorithm for eliminting the stedy stte error of phosphine nd improving the ontrol ury of the system. (3.) FIG. 4 CONROL FLOW CHR OF PHOSPHINE CONCENRION FIG. 5 EMPERURE ND HUMIDIY CONROL FLOW CHR hreshold udgment of slve mhine is obtined by P lgorithm s shown in Figure 5. hrough the monitoring of the sensor, prmeters of temperture nd humidity re mintined within given rnge beuse of opening nd losing of fns nd eletri push rod regulrly

5 4 EXPERIMEN ND RESUL here re two ottges of the spn 24m, the width 5m, the height 5m using s experimentl wrehouse. he wy of fumigtion under film is dopted in grin fumigtion. Eh brn hs 4 fns nd 2 eletri putters tht distribute on both sides of the brn equbly, 8 temperture nd humidity detetors tht enter the depth of the grin below.5m, 4 phosphine detetors whih the depth is loted t m below the grin surfe. he distribution rnge of the bove equipment is shown in Figure 6. FIG. 6 CONROL DEVICES OF PLNE DISRIBUION MP ording to the mthemtil model, k =, k = 4, k 2. Defult vlue (ustomer set) S = {, t, m} = S = t t2 t3 t4 t5 t6 t7 t8 (3.2) m m m m m m m m = (3.3) Where Conentrtion... 4, temperture t...t 8, nd humidity m...m2, vlve opening perentge, nd mening, prmeter, where expresses lose nd expresses open. ssuming E = 8 {,,,,,,, }, so Rounding = ~ ~, t = t, m m~ hen, ssuming ~ = {,,} SE8, 4 ~ t = {,,} SE8, 4 ~ m = {,,} SE 2 = E 2 = {,,,,,,,,,,, } = {,,} E2, 3 {,,} E2 Using PI lgorithm opertion, =, 2 = {,,} E2 PI ( 8 (3.4) (3.5) (3.6) = f ) (3.7) - 5 -

6 Using P lgorithm opertion, { 2, 3} = f P{ t t, m m} (3.8) he onentrtion of H 3 P ws reorded in the stte of utomti ontrol. he finl test results re shown in Figures 7 nd 8. he wrehouse phosphine onentrtion inresed shrply with the vlve opening inreses in three hours while the vlve opening beomes smller until lmost losed stte when the phosphine onentrtion rehes the mximum vlue in the four hour. Beuse of the poor irtight of wrehouse, wrehouse phosphine onentrtion is dynmi stble stte, losing to the set vlue, when the gs lekge is equl to the mount of relesed phosphine. he ontrol system relizes the remote wireless monitoring of multiple PLC with single host omputer. Under the ondition of utomti dustment, the PI ontrol lgorithm is used to mintin the reltive stbility of phosphine onentrtion in predetermined rnge. he mesures of fn nd eletri push rod re used to mintin the grin temperture nd humidity dynmi blne in the non-fumigtion ondition. 9 test vlue preset vlue vlue of vlve opening(%) time(h) Conentrtion of H 3 P ( -6 g/m 3 ) time(h) FIG. 7 HE VLVE OPENING ND HE DEECION OF H3P CONCENRION VLUES ON VLUE vlue of vlve opening(%) time(h) Conentrtion of H 3 P ( -6 g/m 3 ) time(h) test vlue preset vlue 5 CONCLUSION FIG. 8 HE VLVE OPENING ND HE DEECION OF H3P CONCENRION VLUES ON VLUE 2 he mthemtil model of gent is estblished bsed on the theory of rtifiil intelligene. It ws designed tht the grin irultion fumigtion system gent holds PLC s ontroller, industril ontrol omputer nd monitor s the mn-mhine interfe. he utomti ontrol of the onentrtion of phosphine is tested nd the mnul dustment funtion is tken into ount t the sme time. he gent overomes mny disdvntges of trditionl grin fumigtion nd preservtion suh s hrm of mnul sprying, lg of red rel-time dt, instbility of mnul dustment nd low effiieny of on-site opertion. his - 6 -

7 system, whih hs mny dvntges in rel-time dt reording, utomti intelligent ontrol, remote monitoring nd ontrol, hs relized the trnsformtion of intelligent grin depot mngement opertion nd hs wider pplition prospet. he future work needs to be put into experiment in the design of temperture nd humidity ontrol, nd estblishes multi-gent system extending lrge grin storge nd ommunition between different grin gent. his ognitive gent hs to be known in dvne of the environmentl resoures nd is diffiult to pply the unknown environment, or shrp hnge in the environment. So the gent model needs to be further optimized. CKNOWLEDGMEN his reserh is finnilly supported by Key Proets in the Ntionl Siene& ehnology Pillr Progrm in the welve Five-yer Pln Period (No: 25BD8B). REFERENCES [] Ci Zixing, Xu Gungyou. rtifiil Intelligene:Priniples & pplition[m]. Fourth Edition. Beiing : singhu university press,2. [2] Zhng Lilin, Zho Yingie, Li Zho et l. he pplition of phosphine reirultion fumigtion tehnology [J]. Journl of Zhengzhou College of engineering, 2 (22): [3] F. Bellifemine, G. Cire, nd D.Greenwood,Developing multi-gent systems with JDE, John Wiley &Sons,Feb.27. [4] FO plnt prodution nd protetion pper NO.54 Mnul of fumigtion forinset ontrol M-5,ISBN ,984. [5] Winks RG.he Development of SIROFLOMin-ustrli, Pro.Int.Conf.Controlled tmopherend Fumigtion in Grin Storge,Winnipeg [R],Cnd,992. [6] Go Liying. Reserh on urbn trffi signl ontrol method bsed on gent[d]. Beiing: Beiing University of ehnology, 28. [7] Zhng Yongsheng, Zhng Wei. he orret use of phosphine gs detetor [J]. Food proessing, 24:63-64; [8] Co Yongzhn, Wu Di, Jess Zhng. Design of temperture nd humidity ontrol system for grin storge bsed on PLC[J]. Enterprise tehnology development, 25 (34): 5-6. [9] GB/ Food wrehouse phosphine irultion fumigtion equipment [S].999. [] Li Zhokun. Grnry monitoring system of CN bus nd Kingview reserh bsed on [D]. Nnhong: Southwest Petroleum University, 27. [] Mo Xinun, Hu Cuiyun, Sun Yuekun. Reserh on the design of gent oriented progrmming [J]. Journl of softwre, 22,23 (): [2] Zhu Shofu. Design of intelligent brn bsed on ZigBee nd PLC [D]. Huinn: nhui University Of Siene nd ehnology, 25. [3] He Qing. Digitl temperture monitoring system design nd reserh [D]. Lnzhou: Gnsu griulturl University, 27. [4] Zho inzhi,jin Yihui. Modeling Supply Chin Bsed on Multi-gent System[J]. In:Proeedings of the 3 th World Congress on Intelligent Control nd utomtion. Chin Hefei,2, [5] Zeng Jing Hu. Printing qulity nd stndrdiztion of ommunition with humn mhine interfe [J]. printing qulity, 2 (7):

8 UHORS Jun Xue, birthed in Hefei City, nhui Provine, Februry 5, 992 nd erned Bhelor of Engineering in Hefei University of ehnology mored in Proess Equipment nd Control Engineering. Now he studies in Mster of Engineering in University of Siene nd ehnology Chin, mored in Control Engineering. He engges in sientifi reserh of intelligent sensing nd ontrol. 2 Linli Zhou,born in November 98, Ph. D., ssoite professor, mster tutor. He works in the dvned sensing nd intelligent systems reserh lbortory. he min reserh diretion is sptil dt mining, deision modeling nd onstrution of griulturl Internet of things system. t present, he ssumed Ntionl Nturl Siene Foundtion, presided over Ntionl Siene nd tehnology support progr 3 Lei Liu, born in Februry 989, mster.he works in the dvned sensing nd intelligent systems reserh lbortory. t present, the min reserh diretion is the diretion of griulturl Internet of things. 4 Yue Wu, born in 988, mster, working in the dvned intelligent sensing nd intelligent deision-mking lbortory, engged in reserh nd development of high-preision intelligent sensors