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Chattering analysis for discrete sliding mode control ofdistributed control systems 被引量:4
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作者 litong ren shousheng xie +2 位作者 yu zhang jingbo peng ledi zhang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2016年第5期1096-1107,共12页
The chattering characteristic of sliding mode control isanalyzed when it is applied in distributed control systems (DCSs).For a DCS with random time delay and packet dropout, a discreteswitching system model with ti... The chattering characteristic of sliding mode control isanalyzed when it is applied in distributed control systems (DCSs).For a DCS with random time delay and packet dropout, a discreteswitching system model with time varying sampling period isconstructed based on the time delay system method. The reachinglaw based sliding mode controller is applied in the proposedsystem. The exponential stability condition in the form of linearmatrix inequality is figured out based on the multi-Lyaponov functionmethod. Then, the chattering characteristic is analyzed for theswitching system, and a chattering region related with time varyingsampling period and external disturbance is proposed. Finally, numericalexamples are given to illustrate the validity of the analysisresult. 展开更多
关键词 distributed control system sliding mode control switching system chattering analysis.
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Elutriation characteristics of multi-component mixtures in a fluidized bed pyrolysis process 被引量:2
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作者 Xing Wu jingbo peng +1 位作者 Yu Zhang Zhiduo Wang 《Particuology》 SCIE EI CAS CSCD 2021年第5期131-138,共8页
Multi-component mixtures were prepared to simulate a bed of walnut shells undergoing pyrolysis in acold fluidized bed.Four mixtures with different ratios of walnut shell,semi-chars,and clean char were used.Batch elutr... Multi-component mixtures were prepared to simulate a bed of walnut shells undergoing pyrolysis in acold fluidized bed.Four mixtures with different ratios of walnut shell,semi-chars,and clean char were used.Batch elutriation experiments using these mixtures were performed in a transparent fluidized bed to allow direct observation of the flow patterns and particle composition.The results indicated that the bubble wake rather than bubble nose was primarily responsible for particle entrainment at higher gas velocities,and that coarser particles would be“transformed”into elutriable particles.Dimensionless gas velocities ranged from 0.2 to 1.0 and an exponential decrease in particle concentration with respect to bed height was observed.The transport disengagement height(TDH)gradually increased with the gas velocity until the entire bed layer enters a pneumatic transport state.Notably,larger TDHs were required when the bed contained a larger fraction of light components.Two characteristic parameters were used to evaluate particle elutriation:the elutriation rate constant(K),and the residual volatile content of the elutriated particles(v′).These parameters were used to optimize operating gas velocity for the fluidized bed. 展开更多
关键词 Fluidized bed ELUTRIATION Multi-component mixture Walnut shell PYROLYSIS
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