检索结果-内蒙古大学图书馆

第37届中国控制会议

作者： Chao Gan Weihua Cao Kangzhi Liu School of Automation China University of Geosciences Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Department of Electrical and Electronic Engineering Chiba University

Operational drilling parameters optimization is necessary for increase drilling efficiency in complex geological drilling process. There are four key objectives to evaluate the drilling efficiency, including drilling cost, rate of penetration（ROP）, drill bit life, and drill bit’s specific energy. In this paper, we proposed a multi-objective optimization method to improve drilling efficiency in the complex geological drilling process considering all the four key objectives. Firstly, the characteristics of complex geological drilling process and optimization problems are analyzed to find the vital process parameters and problems for drilling efficiency optimization. Then, a multi-objective optimization model which combines the four key objectives is ***, an improved nondominated sorting genetic algorithm（improved NSGA-II） is used to optimize the operational drilling parameters include weight on bit（WOB） and rotational speed（RS） to make drilling efficiency improved. The real case results demonstrate that our method increases the drilling efficiency in four key objectives and saves the simulation time. The proposed method provides the foundation for intelligent optimization control in complex geological drilling process.

关键词： Operational Drilling Parameters Multi-objective Optimization complex Geological Drilling Process Drilling Efficiency Improved NSGA-II

来源：评论

学校读者我要写书评

暂无评论

Research on the Magnetic Field Generator of Overhauser Magnetic Sensor

Research on the Magnetic Field Generator of Overhauser Magne...

引用

第37届中国控制会议

作者： Xiangyu Qiu Jian Ge Haobin Dong Han Li Wang Luo Huan Liu Zhiwen Yuan Jun Zhu Haiyang Zhang School of Automation China University of Geosciences Hubei key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Institute of Geophysics & Geomatics China University of Geosciences

Magnetic field generator is an essential part of the automatic measurement of geomagnetic elements. Based on the Biot-Savart law, mathematical models of magnetic field distribution of different types of magnetic field generators are established. The magnetic intensity and the homogenous area of them are discussed. The analysis results show that increasing the number of coils can increase magnetic intensity. Meanwhile, the designed sphere coil can generate a larger uniform magnetic field with a smaller geometric size, and overcomes the deficiencies in the space utilization of the traditional magnetic field generator. In addition, it has great potential to miniature the size of the geomagnetic measurement instruments.

关键词： Biot-Savart law magnetic field generator sphere coil

来源：评论

学校读者我要写书评

暂无评论

Study on BCH based Encoder and Decoder Approach for EM-MWD Communication system

Study on BCH based Encoder and Decoder Approach for EM-MWD C...

引用

第37届中国控制会议

作者： Cheng Zhang Haobin Dong Jian Ge Huan Liu Bingjie Bai Zhiwen Yuan Jun Zhu Haiyang Zhang School of Automation China University of Geosciences Hubei key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Institute of Geophysics & Geomatics China University of Geosciences

In practical applications of electromagnetic measurement while drilling(EM-MWD),the signal-to-noise ratio(SNR)of receiver cannot always meet the requirements of reliable communication conditions due to the earth-attenuation,interfering signal from well site,*** to solve these problems,this paper presents a BCH encoder and decoder technology based on BPSK for ***,the paper studies the relationship between BCH encoding error performance and decoding method,source length and other factors through simulation;then,we obtain an optimal length of BCH code for EM-MWD through analyzing the bit error performance of hard-decision decoding and soft-decision decoding with different lengths of BCH *** results show that the proposed algorithm can reduce the bit error rate at a lower SNR,achieving a reliable communication condition when the SNR of a received signal is *** is demonstrated the effectiveness of the proposed BCH encoder and decoder algorithm based on BPSK for EM-MWD.

关键词： EM-MWD system BPSK BCH Optimized coding techniques

来源：评论

学校读者我要写书评

暂无评论

A novel non-dominated sorting approach based on dominance ranking graph

A novel non-dominated sorting approach based on dominance ra...

引用

第37届中国控制会议

作者： Yiya Diao Changhe Li Junchen Wang Sanyou Zeng School of Automation China University of Geosciences Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems School of Electrical and Mechanical China University of Geosciences

Non-dominated sorting is widely used in multi-objective evolutionary algorithms. There are many approaches to non-dominated sorting, but they are computationally expensive when the number of objectives or the number of fronts becomes relatively large. This paper proposes an efficient non-dominated sorting approach based on a dominance ranking graph created in this paper. The approach takes advantages of both the dominated and non-dominated relationships, it is able to efficiently handle the case of large number of objectives/fronts. Experimental results show that the proposed algorithm outperforms its several popular variants in most of the tests.

关键词： non-dominated sorting dominance ranking graph many-objective optimization

来源：评论

学校读者我要写书评

暂无评论

H ∞ finite time control for discrete time-varying system with interval time-varying delay

引用

Journal of the Franklin Institute 2018年第12期355卷 5037-5057页

作者： Menghua Chen Jian Sun School of Automation Beijing Institute of Technology Beijing 100081 China Key Laboratory of Intelligent Control and Decision of Complex System Beijing 100081 China

This paper discusses the problem of H ∞ finite time control for a discrete time-varying system with interval time-varying delay. By constructing a new augmented time-varying Lyapunov functional involving triple summation items and using discrete Wirtinger-type inequalities, delay-dependent conditions are derived, which guarantee that the closed-loop system is not only finite time bounded (FTB) but also satisfies an H ∞ performance. Furthermore, the time-varying feedback controller can be derived by solving a series of recursive linear matrix inequalities (RLMIs). Simulation results show the effectiveness and superiority of the proposed method.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Exponential Stability of Highly Nonlinear Neutral Stochastic Differential Delay Equations

Exponential Stability of Highly Nonlinear Neutral Stochastic...

引用

Chinese control Conference (CCC)

作者： Yinghui Hu Xiaofeng Zong Jinhua She Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan China School of Engineering Tokyo University of Technology Tokyo Japan

This paper investigates the mean square and almost sure stability of a class of neutral stochastic differential delay equations with highly nonlinear coefficients. We first examine the regularity of the solution to the highly nonlinear neutral stochastic differential delay systems. Then the explicit stability conditions are obtained by the Lyapunov functional and semi-martingale convergence theorem. Especially, the explicit stability conditions of pure delay neutral stochastic differential delay equations are obtained. It is revealed that the delay term in the drift can contribute to the mean square and almost sure stability.

关键词： Stability criteria Delays Asymptotic stability control theory Differential equations

来源：评论

学校读者我要写书评

暂无评论

Design of High-Gain-Observer-Based State Feedback controller for Positive Time-Delay system

Design of High-Gain-Observer-Based State Feedback Controller...

引用

Chinese control Conference

作者： Mingyuan Xie Jinhua She Zhentao Liu Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan China School of Engineering Tokyo University of Technology Tokyo Japan

This paper investigates the stabilizability of positive time-delay system. The nonnegative constraint makes the design of a control law different from a general system. Firstly, a method to calculate the L_1 gain of a positive time-delay system is presented. Then, the design of a state feedback controller and a high-gain observer is presented by taking full advantage of the characteristics of the positiveness of the system. Finally, the observer and feedback controller are combined to stabilize the system and improve dynamic performance. A numerical example illustrates the provided method is effective.

关键词： Observers State feedback Delays Closed loop systems Adaptive control Delay effects

来源：评论

学校读者我要写书评

暂无评论

control of Wireless Network Communication for Industrial Robot Servo systems

Control of Wireless Network Communication for Industrial Rob...

引用

Chinese control Conference (CCC)

作者： Meiliu Li Guangjun Wang Jinhua She Zhentao Liu Danyun Li Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan China School of Engineering Tokyo University of Technology Tokyo Japan

To meet the needs of high speed and good environmental adaptability for data transmission in industrial robot servo systems, this paper presents a wireless transmission technology on a data acquisition control terminal. The system is based on STM32F103RET6 processor and reads cache data from the SRAM of FPGA in DMA method, and communicates with a WIFI chip, Marvell 88w8686, through the SDIO interface. A host computer segments and filters the data received by the WIFI chip and sends control commands back to STM32. The functions of the hardware and software of the system contains data compression and storage, wireless data transmission, data display, and control-command transmission. An experimental platform has been built. It carries out real-time transmission of 8-16 digits based on the TCP/IP protocol with expected performance.

关键词： Wireless fidelity Wireless communication Servomotors Data communication Service robots Field programmable gate arrays

来源：评论

学校读者我要写书评

暂无评论

Gesture Intention Understanding Based on Depth and RGB Data

Gesture Intention Understanding Based on Depth and RGB Data

引用

Chinese control Conference

作者： Yu Feng Luefeng Chen Wanjuan Su Kaoru Hirota Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan China School of Engineering Tokyo Institute of Technology Yokohama Japan

Aiming at the problem that the process of gesture recognition based on color image is greatly affected by environmental factors such as lighting, a gesture intent understanding method based on the fusion of Red-Green-Blue (RGB) data and depth data is proposed. Firstly, the gesture feature extraction based on the Speeded Up Robust Feature (SURF) method after foreground segmentation are used to get gesture information. Then, we apply Backpropagation (BP) neural network to classify and recognize gestures. The final recognition results are obtained through data fusion from recognition results based on both RGB images and depth images. We evaluated the effectiveness of the proposed method through ChaLearn Gesture Database.

关键词： Feature extraction Image segmentation Gesture recognition Robustness Image recognition Neural networks Robot sensing systems

来源：评论

学校读者我要写书评

暂无评论

Application of pseudo random correlation identification method based on LabViewin electromagnetic prospecting

Application of pseudo random correlation identification meth...

引用

Chinese control Conference (CCC)

作者： Fan Li ZhiHua Li Hongwei Li Zikun Yang Pei Gao Wenqi Zhou School of Automation china University of Geosciences Wuhan Hubei Key Laboratory of Advanced Contol and Intelligent Automation for Complex Systems Wuhan

Electromagnetic exploration plays an important role in the development of mineral, oil and gas resources and other minerals. With the improvement of exploration depth and longitudinal resolution, as well as the increasing humanistic interference in modern society, the electromagnetic exploration method put forward higher requirements. Improving the signal to noise ratio is the key to the development of electromagnetic exploration. Since the pseudo-random sequence is proposed as an artificial field source in the exploration of electromagnetic field, the pseudo-random technique based on correlation identification is also applied to the exploration of electromagnetic method in view of the good correlation characteristics and anti -jamming ability of pseudo-random sequence. In this paper, the principle of correlation identification is introduced, and the realization of correlation spectrum analysis in Lab View is studied. The 2 n sequence pseudorandom signal is used as system excitation signal to verify the anti-jamming performance of correlation identification method in electromagnetic prospecting. It has great application prospect.

关键词： Correlation Interference Electromagnetics Spectral analysis Signal to noise ratio White noise Fourier transforms

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：