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HOSM controller design with asymmetric output constraints

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Science China(Information Sciences) 2022年第8期65卷 287-288页

作者： keqi mei Shihong DING School of Electrical and Information Engineering Jiangsu University

Dear editor,In many control systems, the output constraints are imposed for security reasons and intrinsic physical limitations [1]. For instance, the vibrations of moving strings should be kept within the constrained region to avoid serious hazards [2].Handling output constraints for a controller design is undoubtedly an intractable problem.

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A Novel SOSM Control Method by Using Adaptive Fuzzy Technique

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A Novel SOSM Control Method by Using Adaptive Fuzzy Techniqu...

A Nested Saturated Second-order Sliding Mode Controller Design

第40届中国控制会议

作者： Binbin Zhang Shihong Ding keqi mei School of Electrical and Information Engineering Jiangsu University

In practical application systems,the output constraints are *** of output constraints may cause system damage as well as performance *** this paper,adaptive fuzzy second-order sliding mode（SOSM） controllers are designed which is studied for a class of non-linear systems with output *** unknown bounds of uncertainties are approached dynamically by fuzzy logic *** constructing a new barrier Lyapunov function,the output constraint problem has been well ***,by combining adding a power integrator（API） technology and adaptive fuzzy control,a novel adaptive fuzzy SOSM controller is *** is demonstrated that the proposed algorithm keeps the output variables within the specified constraint ***,the finite-time stability of the resulting closed-loop system under output constraints can be shown to be guaranteed by the Lyapunov ***,an example is presented to demonstrate the validity of the proposed SOSM control strategy.

关键词： Sliding mode adaptive control finite-time convergence fuzzy logic systems adding a power integrator output constraints

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A Nested Saturated Second-order Sliding Mode Controller Desi...

基于固定时间非奇异终端滑模的汽车主动前轮转向系统控制

第37届中国控制会议

作者： keqi mei Shihong Ding Wei Xing Zheng Haibo Du School of Electrical and Information Engineering Jiangsu University School of Computing Engineering and Mathematics University of Western Sydney School of Electrical Engineering and Automation Hefei University of Technology

In this paper, a nested saturated second-order sliding mode（SOSM） controller has been constructed based on the saturation technique and geometric method. The proposed controller includes a saturation function, which could change the phase trajectory of the sliding variables under the traditional SOSM algorithms. The geometric method has been used to test the finite-time convergence of the sliding variables and reveal the relations between the control parameters and the shape of the phase trajectory. Finally, a numerical example has been given to validate the effectiveness and feasibility of the proposed method.

关键词： Second-order sliding mode Lyapunov analysis finite-time stability

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扬州大学学报（自然科学版） 2023年第6期26卷 39-43,50页

作者：陈一伦梅珂琪戴肖肖张汉章蒋连杰吴元柱丁世宏江苏大学电气信息工程学院江苏镇江212000 浙江加力仓储设备股份有限公司浙江湖州313000

针对汽车主动前轮转向系统(active front steering,AFS)中的安全控制问题,提出一种基于固定时间非奇异终端滑模的主动前轮转向控制器.将固定时间终端滑模与幂次趋近律相结合设计一种新的固定时间非奇异终端滑模控制器,以实现系统的快速... 详细信息

针对汽车主动前轮转向系统(active front steering,AFS)中的安全控制问题,提出一种基于固定时间非奇异终端滑模的主动前轮转向控制器.将固定时间终端滑模与幂次趋近律相结合设计一种新的固定时间非奇异终端滑模控制器,以实现系统的快速稳定控制和削弱系统稳态时的抖振,使得闭环系统的收敛时间仅取决于滑模面及控制器的参数设计,而与系统的初始值无关.基于Lyapunov稳定性理论验证了闭环系统的稳定性.仿真结果表明,所提固定时间终端滑模控制方法的快速性和稳定性均优于传统滑模控制和PI控制方法.

关键词：固定时间收敛非奇异终端滑模控制主动前轮转向系统

基于自适应非奇异终端滑模的Buck变换器控制

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扬州大学学报（自然科学版） 2024年第1期27卷 33-40页

作者：胡印聪刘陆戴肖肖张汉章蒋连杰吴元柱梅珂琪江苏大学电气信息工程学院江苏镇江212013 浙江加力仓储设备股份有限公司浙江湖州313104

为了提高滑模控制下Buck变换器的控制性能并降低抖振,提出一种自适应非奇异终端滑模控制方法.首先,对Buck变换器进行建模与分析,得到存在扰动时的数学模型;其次,设计非奇异终端滑模面,进行控制器设计和稳定性分析,使得闭环系统在有限时... 详细信息

为了提高滑模控制下Buck变换器的控制性能并降低抖振,提出一种自适应非奇异终端滑模控制方法.首先,对Buck变换器进行建模与分析,得到存在扰动时的数学模型;其次,设计非奇异终端滑模面,进行控制器设计和稳定性分析,使得闭环系统在有限时间内收敛并避免控制奇异问题,同时利用自适应律得到尽量小且足够抑制扰动的动态控制增益以削弱抖振;最后,通过理论分析和仿真实验验证所提控制方法的有效性.结果表明:该控制方法可以在减弱控制抖振的同时使得Buck变换器的输出电压在有限时间内跟踪上参考电压;当Buck变换器中的负载电阻和输入电压突变时,所提方法亦能表现出良好的抗干扰能力.

关键词： Buck变换器自适应技术非奇异终端滑模有限时间收敛

New highly specific anti-BnASY polyclonal antibody prepara-tion and application in immunofluorescence assay

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Oil Crop Science 2016年第4期1卷 58-64页

作者： keqi Li Rong Yuan Xiaohong Yan Xinhua Zeng Ruixing Guo Gang Wu Key Laboratory of Biology and Genetic improvement of Oil crops Ministry of Agriculture Oil Crops Research Institute Chi-nese Academy of Agricultural Sciences Wuhan China

ASY （asynaptic） is a synaptonemal complex （SC） related protein in plant mei- osis. Some ASYs in plants have been cloned and functional determined. ASY in Brassica napus has not been sequenced and functional certificated. Here, we first cloned ASY gene in Brassica napus （BnASY） and inserted it into vector pET-32a for expression fusion protein BnASY-6His in Escherichia coli BL21 （DE3）. Purified fusion protein was used to produce polyclonal antibody. Specificity and application of polyclonal antibody was examined by Western blot and immunofluorescence assay. Results showed that BnASY-6His recombi-nant protein and anti-BnASY antibody were successfully obtained. Polyclonal anti-BnASY antibody had high specificity. Results of immunofluorescence showed that ASY signals appeared at leptotene stage, faded away gradually at pachytene stage and almost disap-peared at diplonema stage. In this study, highly specific polyclonal antibody was success-fully acquired and used for immunofluorescence assay in plant cells. It will contribute to functional research of ASY in B. *** thank Zhigang Li for providing pET-32a vector and Escherichia coli BL21 pLysS strains.

关键词： Brassica napus BnASY polyclonal antibody immunofluorescence

大跨径连续刚构桥腹板裂缝成因分析及处治措施探讨

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林业建设 2019年第2期 59-63页

作者：苏克啟李雪梅陈大风国家林业和草原局昆明勘察设计院云南昆明650216

以某桥施工为例,分析腹板裂缝成因,提出处治措施。

关键词：大跨径连续刚构桥腹板裂缝成因分析处治措施

长链非编码RNA-MALAT1调控miR-22/snail轴对胃癌增殖、迁移及侵袭的影响

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重庆医科大学学报 2019年第11期44卷 1408-1416页

作者：陈虹宇廖盛涛郑茜邱烈旺余柯岐吕琳梅浙川重庆医科大学附属第二医院消化内科

目的:探讨长链非编码RNA MALAT1(long non-coding RNA MALAT1,lnc RNA MALAT1)调控miR-22/snail轴对胃癌增殖、迁移及侵袭的影响。方法:采用siRNA干扰技术抑制MALAT1表达,同时过表达miR-22和Snail;采用RT-PCR检测MALAT1,miR-22和snail在胃癌细胞系中的表达水平(n=3);采用Western blot检测NC组、si-MALAT1组中snail蛋白的表达水平(n=3);采用CCK-8法在12、24、48、72 h检测NC组、si-MALAT1组、miR-22组、miR-22+snail组、si-MALAT1+miR-22组中细胞吸光度值(n=3);采用划痕实验检测NC组、si-MALAT1组、miR-22组迁移速度(n=3);采用Transwell检测NC组、siMALAT1组、miR-22组、miR-22+snail组、si-MALAT1+miR-22组穿过膜细胞的个数(n=3);采用双荧光素酶检测NC+pMIRMALAT1-WT组、NC+pMIR-MALAT1-MUT组、miR-22+pMIR-MALAT1-WT组、miR-22+pMIR-MALAT1-MUT、NC+pMIRSnail-WT组、NC+pMIR-Snail-MUT组、miR-22+pMIR-Snail-WT组、miR-22+pMIR-Snail-MUT组的荧光活性(n=3)。两独立样本间的比较采用t检验,多组数据之间的比较采用单因素方差进行分析,涉及时间因素时采用重复测量方差分析。结果:MALAT1在胃癌细胞系中的表达水平明显高于正常胃黏膜上皮细胞(均P=0.000);低表达MALAT1后,AGS和SGC-7901增殖能力(P1=0.001,P2=0.005),迁移能力(P1=0.018,P2=0.007),侵袭能力(P1=0.024,P2=0.015)均降低;同时双荧光素酶结果显示MALAT1能够靶向结合miR-22(P=0.001),miR-22能够靶向结合snail(P=0.001);miR-22在胃癌细胞中的表达水平明显低于正常胃黏膜上皮细胞(均P<0.05);过表达miR-22后,AGS和SGC-7901增殖能力(P1=0.004,P2=0.009),迁移能力(P1=0.034,P2=0.005),侵袭能力(P1=0.037,P2=0.011)均降低;在低表达MALAT1和过表达miR-22后能够更进一步增加低表达MALAT1后对AGS和SGC-7901的增殖(P1=0.022,P2=0.006)和侵袭(P1=0.024,P2=0.015)的抑制作用;同时过表达miR-22和snail后能够反转miR-22对AGS和SGC-7901的增殖(P1=0.003,P2=0.004)和侵袭(P1=0.015,P2=0.01)的抑制作用。结论:MALAT1在胃癌细胞中明显高表达,并能通过调控miR-22/snail轴促进胃癌增殖、迁移及侵袭。

关键词：长链非编码RNA MALAT1 miR-22 snail 增殖迁移侵袭

LZ91镁锂合金薄板焊接工艺及接头组织性能研究

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焊管 2023年第2期46卷 6-11,19页

作者：韩珂琪胥珊娜强伟高美刘港西安石油大学材料科学与工程学院西安710065 西安热工研究院有限公司西安710032

为了研究焊接电流对LZ91镁锂合金焊接接头组织和性能的影响,采用三种不同焊接电流(60 A、70 A、80 A)的脉冲钨极氩弧焊对1 mm厚的LZ91镁锂合金薄板进行了焊接,并利用金相光学显微镜、扫描电子显微镜、XRD、显微硬度仪和拉伸试验对焊接... 详细信息

为了研究焊接电流对LZ91镁锂合金焊接接头组织和性能的影响,采用三种不同焊接电流(60 A、70 A、80 A)的脉冲钨极氩弧焊对1 mm厚的LZ91镁锂合金薄板进行了焊接,并利用金相光学显微镜、扫描电子显微镜、XRD、显微硬度仪和拉伸试验对焊接接头的微观结构和力学性能进行了表征,利用电化学工作站测试焊缝的耐腐蚀能力。结果表明:三种焊接电流条件下,焊接接头熔合良好,均无明显裂纹、气孔等焊接缺陷;其中70 A、80 A焊接电流的焊缝区较热影响区具有更小的晶粒;硬度以焊缝区最高,热影响区次之,均高于母材;焊接接头的抗拉强度均高于母材,其中焊接电流70 A时拉伸性能最佳,抗拉强度达到最大值125.20 MPa,伸长率保持在母材的35%以上;经电化学测试,在70 A焊接电流条件下得到的焊缝耐腐蚀能力最强。

关键词：镁锂合金 TIG焊接微观结构力学性能