This paper investigates the consensus control of multi-agent systems(MASs) with constrained input using the dynamic event-triggered mechanism(ETM).Consider the MASs with small-scale networks where a centralized dynami...This paper investigates the consensus control of multi-agent systems(MASs) with constrained input using the dynamic event-triggered mechanism(ETM).Consider the MASs with small-scale networks where a centralized dynamic ETM with global information of the MASs is first designed.Then,a distributed dynamic ETM which only uses local information is developed for the MASs with large-scale networks.It is shown that the semi-global consensus of the MASs can be achieved by the designed bounded control protocol where the Zeno phenomenon is eliminated by a designable minimum inter-event time.In addition,it is easier to find a trade-off between the convergence rate and the minimum inter-event time by an adjustable parameter.Furthermore,the results are extended to regional consensus of the MASs with the bounded control protocol.Numerical simulations show the effectiveness of the proposed approach.展开更多
Persian territory,which is dividable into major seismotectonic provinces,always suffers from damages of moderate and large earthquakes from ancient era to modern time.Therefore,temporal prediction of earthquake occurr...Persian territory,which is dividable into major seismotectonic provinces,always suffers from damages of moderate and large earthquakes from ancient era to modern time.Therefore,temporal prediction of earthquake occurrence in this kind of area is an important topic.For this purpose,628 moderate-large(5.5≤MS≤8.2)earthquakes occurred in Persia during the period from 400 B.C.to 2015 C.E.were used.Considering the magnitudes of events preceding main shocks and the annual seismic moment release in seismic source areas in the provinces,we calibrated equations predicting inter-event time of occurrence of moderate and large earthquakes(MW>5.5)in Iran.In each source area,inter-event times between moderate and large shocks with magnitudes equal to or larger than a certain cut-off magnitude(MW5.5)were calculated.The inter-event times between the earthquakes were used to compute the relationships using multiple regression technique.Calculated relationships express the basic idea of the time predictable model predicting the occurrence time of the future main shock in a certain seismogen area.However,despite of unavoidable scatter in observations and uncertainties in the results,occurrence times of main shocks during the next years and decades in some source areas in Iran were determined.展开更多
Characteristic slip and characteristic earthquake models have been proposed for several decades. Such models have been supported recently by high-resolution offset measurements. These models suggest that slip along a ...Characteristic slip and characteristic earthquake models have been proposed for several decades. Such models have been supported recently by high-resolution offset measurements. These models suggest that slip along a fault recurs via similarly sized, large earthquakes. The inter-event strain accumulation rate(ratio of earthquake slip and preceding interseismic time period) is used here to test the characteristic earthquake model by linking the slip and timing of past earthquakes on the Haiyuan Fault. We address how the inter-event strain accumulation rate varies over multiple seismic cycles by combining paleoearthquake studies with high-resolution airborne light detection and ranging(Li DAR) data to document the timing and size of paleoearthquake displacements along the western and middle segments of the Haiyuan Fault. Our observations encompass 5 earthquake cycles. We find significant variations over time and space along the Haiyuan Fault. We observe that on the middle segment of the Haiyuan Fault the rates slow down or increase as an anticorrelated function of the rates of preceding earthquakes. Here, we propose that the inter-event strain accumulation rates on the middle segment of the Haiyuan Fault are oscillating both spatially and temporally. However, along the western segment, the inter-event strain accumulation rate is both spatially and temporally steady, which is in agreement with quasi-periodic and slip-predictable models. Finally,we propose that different fault segments within a single fault zone may behave according to different earthquake models.展开更多
基金supported in part by the National Natural Science Foundation of China(51939001,61976033,62273072)the Natural Science Foundation of Sichuan Province (2022NSFSC0903)。
文摘This paper investigates the consensus control of multi-agent systems(MASs) with constrained input using the dynamic event-triggered mechanism(ETM).Consider the MASs with small-scale networks where a centralized dynamic ETM with global information of the MASs is first designed.Then,a distributed dynamic ETM which only uses local information is developed for the MASs with large-scale networks.It is shown that the semi-global consensus of the MASs can be achieved by the designed bounded control protocol where the Zeno phenomenon is eliminated by a designable minimum inter-event time.In addition,it is easier to find a trade-off between the convergence rate and the minimum inter-event time by an adjustable parameter.Furthermore,the results are extended to regional consensus of the MASs with the bounded control protocol.Numerical simulations show the effectiveness of the proposed approach.
文摘Persian territory,which is dividable into major seismotectonic provinces,always suffers from damages of moderate and large earthquakes from ancient era to modern time.Therefore,temporal prediction of earthquake occurrence in this kind of area is an important topic.For this purpose,628 moderate-large(5.5≤MS≤8.2)earthquakes occurred in Persia during the period from 400 B.C.to 2015 C.E.were used.Considering the magnitudes of events preceding main shocks and the annual seismic moment release in seismic source areas in the provinces,we calibrated equations predicting inter-event time of occurrence of moderate and large earthquakes(MW>5.5)in Iran.In each source area,inter-event times between moderate and large shocks with magnitudes equal to or larger than a certain cut-off magnitude(MW5.5)were calculated.The inter-event times between the earthquakes were used to compute the relationships using multiple regression technique.Calculated relationships express the basic idea of the time predictable model predicting the occurrence time of the future main shock in a certain seismogen area.However,despite of unavoidable scatter in observations and uncertainties in the results,occurrence times of main shocks during the next years and decades in some source areas in Iran were determined.
基金supported by the NSFC (41472201, 41304073, 41661134011, and 41761144071)the Stake Key Laboratory of Earthquake Dynamics (SKLED, LED2014A03)
文摘Characteristic slip and characteristic earthquake models have been proposed for several decades. Such models have been supported recently by high-resolution offset measurements. These models suggest that slip along a fault recurs via similarly sized, large earthquakes. The inter-event strain accumulation rate(ratio of earthquake slip and preceding interseismic time period) is used here to test the characteristic earthquake model by linking the slip and timing of past earthquakes on the Haiyuan Fault. We address how the inter-event strain accumulation rate varies over multiple seismic cycles by combining paleoearthquake studies with high-resolution airborne light detection and ranging(Li DAR) data to document the timing and size of paleoearthquake displacements along the western and middle segments of the Haiyuan Fault. Our observations encompass 5 earthquake cycles. We find significant variations over time and space along the Haiyuan Fault. We observe that on the middle segment of the Haiyuan Fault the rates slow down or increase as an anticorrelated function of the rates of preceding earthquakes. Here, we propose that the inter-event strain accumulation rates on the middle segment of the Haiyuan Fault are oscillating both spatially and temporally. However, along the western segment, the inter-event strain accumulation rate is both spatially and temporally steady, which is in agreement with quasi-periodic and slip-predictable models. Finally,we propose that different fault segments within a single fault zone may behave according to different earthquake models.
