Active Fault Tolerant Control Based on a Novel Tracking Differentiator for Elevating Stage Control System

In view of the speed sensor faults in elevating stage control system, an active fault tolerant control approach based on a novel tracking differentiator is proposed in this paper. First, the analytical redundancy relationship between the velocity and displacement signals in a dual closed loop control system is used to detect a fault. When the deviation between the differential of normal displacement sensor signal and the fault speed sensor output exceeds a certain threshold value, a fault can be considered to occur. Secondly, after a fault is detected, the output of the fault sensor is replaced immediately with the differential signal of the output from a normal sensor to ensure the safety of the postfault system. In the process of signal differential, considering the drawbacks of the traditional method which uses inertial element to approximate differentiator and complex parameter tuning of Han’s Tracking Differentiator (TD), a novel tracking differentiator based on hyperbolic tangent function (Tanh-TD) is designed. Thirdly, in order to avoid the switching vibration and improve the reliability of FDD, a continuous smooth switching tactic based on exponential function is constructed. The simulation results show that the fault diagnosis method is simple and timely, the designed tracking differentiator is fast and effective, and the effect of the fault tolerant control based on smooth switching strategy is also satisfactory

Active Fault Tolerance Control Based on Consistent Matrix for Multimotor Synchronous System

This paper presents an active fault-tolerant method to mitigate sensor failures in multimotor synchronous control. First, inspired by the construction of the coupling matrix in complex network synchronous output, a consistent matrix is designed based on structural redundancy in synchronous control. This consistent matrix has two advantages: one is that it can reflect different sensor output similarities and the other one is that it can detect, locate, and estimate the sensor fault. Then, the fault information is integrated into the design of tolerance control with an improved mean feedback mechanism. The proposed method is suitable for both single and multiple fault situations, and its effectiveness is finally verified by both MATLAB simulation and the ABB semiphysical experimental platform

Analysis of the difference between the test and production in Well Z202-H1

In recent years, shale gas in the Upper Ordovician Wufeng Formation and lower Silurian Longmaxi Formation is gradually developing into deep strata in Sichuan Basin. Well 202-H1 is a evaluation well deployed to evaluate the productivity of horizontal Wells in longmaxi Formation and Wufeng Formation in The West Chongqing block. The well type is horizontal well. The main reasons for the poor production effect of Well Z202-H1 are as follows: Reservoir pores are not developed; continuous thickness of thin reservoir; insufficient fracturing treatment; low flowback rate, large water production and wellbore fluid accumulation. This article not only obtained the reasons for the difference between the test and production of well Z202-H1, but also provided a new research idea for the test and production tracking analysis of deep shale gas static in The Western Chongqing block

Re-Os dating of molybdenite from the Kafang skarn copper (tin) deposit in the Gejiu tin polymetallic ore district and its geological significance

The Gejiu tin polymetallic ore district is a famous tin polymetallic ore producing area in Yunnan Province. The Kafang skarn copper (tin) deposit is one of important mineral deposits of the Gejiu region. Re-Os dating of five molybdenite separated from the Kafang skarn ore bodies gives an isochron age of 83.4 ± 2.1Ma and model age ranges from 82.95 ± 1.16 to 83.54 ± 1.31 Ma. This age is in good agreement with Laoka granite zircon LA-ICP-MS U-Pb age(85 ± 0.85Ma). These ages suggest that the mineralization in the Kafang skarn deposit was genetically assoicatted to the Laoka granite. The Re contents of molybdenite indicate that ore-forming materials are derived from mantle and crust. Based on the geochronological data of Dulong Sn-Zn deposit, Bainiuchang Ag super-large deposit, Dachang tin polymetallic ore field and Wangshe Cu-W deposit and analysis of tectonic evolution of Southeast of Yunnan Province, we propose that these deposits occurred at the same geodynamic framework as a result of large scale mineralization in South China

Petrogenesis of the Laochang-Kafang granite in the Gejiu area, Yunnan Province: constraints from geochemistry and zircon U-Pb dating

A great deal of intrusive rocks closely related to metallogeny developed in the Gejiu area, Yunnan rovince. This paper aimed at the blind granites stocks in the Laochang-Kafang area, which intruded into Triassic limetone and carbonate sequence of the Gejiu Formation. The lithology of the granite is mainly medium to fine grained biotitic granitic rock, which is closely related to metallogency in the Gejiu area. The research shows that values of the ACNK are mostly over 1. 0 and the contents of U and Th are very high, suggesting that the Laoka granite belongs to shoshonitic and HHP granite. This kind of S-type granite had experienced high differentiation. The diagram of Rb/Sr vs. Rb/Ba and CaO/Na20 vs. A1203/ Ti02 all indicate the Laoka granite originated from the magma formed by argillite rocks. Zircon LA-ICP-MS dating result shows that the Laochang-Kafang rock complex empaced at 85 ± 0. 85Ma and spatial distribution are obviously different from the late granite formed in Yanshanian in the Cathaysia block. Regional geology and granite geochemistry disply hint that the Gejiu area was in an extensional structural setting during the late Yanshanian

Recognition of Late Jurassic W-Sn mineralization and its exploration potential on the western margin of the Caledonian Guidong granite batholith, Nanling Range, South China: Geochronological evidence from the Liuyuan Sn and Zhuyuanli W deposits

Recently, the mineral potential of the area surrounding the granitic batholiths in the Nanling Range was highlighted by the discovery of a series of tungsten and tin deposits or occurrences hosted in or near the Penggongmiao and Guidong batholiths in southern Hunan Province, South China. However, the lack of high precision geochronological data from these deposits has hampered the understanding of their ore genesis and further W-Sn exploration progress. Based on detailed geological investigations, we obtained precise Secondary Ion Mass Spectroscopy (SIMS) zircon U-Pb and muscovite Ar-Ar ages from the greisen-dominated Liuyuan tin deposit and Zhuyuanli tungsten deposit, which are located on the western margin of the Guidong batholith. The results show that the Ar-40/Ar-39 plateau age of muscovite (153.10 +/- 0.96 Ma) from the Liuyuan tin deposit is consistent with the Ar-40/Ar-39 plateau age of muscovite (151.64 +/- 0.96 Ma) from the Zhuyuanli tungsten deposit within analytical error. These data indicate that the W-Sn mineralization in the region occurred during the Late Jurassic, which is significantly later than the emplacement of the Caledonian (Early Paleozoic) ore-hosting Guidong granite batholith, as evidenced by the SIMS zircon U-Pb age data from the Liuyuan greisen (438.1 +/- 2.6 Ma) and the Zhuyuanli greisenized granite (433.8 +/- 3.1 Ma). The remarkable differences in age between the Guidong batholith emplacement and formation of these two W-Sn ore deposits indicate that the regional tungsten and tin mineralization is temporally and genetically associated with possibly concealed Late Jurassic granite at depth rather than with the surrounding Caledonian granite batholith. The uniform W-Sn mineralization age (153-151 Ma) of the Liuyuan and Zhuyuanli deposits suggests that significant Late Jurassic W-Sn ore-forming potential exists along the western margin of the Guidong batholith