检索结果-内蒙古大学图书馆

2024 4th International Conference on Advanced Materials and Chemical engineering, AMCE 2024

作者： Li, Xiaolong Lei, Zigang Li, Cong Wang, Yuan Shang, Xufeng Zhou, Jie China National Key Laboratory of Oil and Gas Drilling and Transportation Equipment PetroChina Engineering Materials Research Institute Co. Ltd. Shaanxi Xi'an710077 China Xi'An Dexincheng Science and Technology Co. Ltd. Shaanxi Xi'an710065 China PetroChina Tarim Oilfield Branch Korla Xinjiang841000 China

Several puncture leaks and perforation failures occurred in the water injection pipeline outside a joint station in a western oilfield, seriously affecting the pipeline's integrity. By analyzing the clogging in the pipeline, it was found that the corrosion caused by salt and scale inside the pipeline was the main reason for the perforation failure of the water injection pipeline outside the station. Given the serious corrosion and scaling of the water injection pipeline outside the station, the multi-functional agent of corrosion inhibitor, scale inhibitor, and salt suppressant was developed. It was determined that the agent had the best effect when the ratio of the single-agent additive corrosion inhibitor, scale inhibitor, and salt suppressant was 2:3:5. The sum of the three is 87% of the formula. At 40°C, when the addition amount was 150 mg/L, the corrosion rate of P110 steel was only 0.0307 mm/a, the scale inhibition rate for CaCO3 can reach 83.5%, and the salt inhibition rate can get 4.5%. Field corrosion monitoring test piece evaluation test results show that the uniform corrosion rate of the coupons monitored by the three monitoring points is greatly reduced after the corrosion and scale and salt inhibitor are added, and the higher the injection concentration is, the lower the uniform corrosion rate is. When the concentration is high, there are almost no salt crystals on the surface of the monitoring coupon, and a small amount of salt crystals are precipitated after the concentration is reduced. © Published under licence by IOP Publishing Ltd.

关键词： Corrosion rate

来源：评论

学校读者我要写书评

暂无评论

Few-shot Underwater Acoustic Target Recognition Based on Siamese Network 42

Few-shot Underwater Acoustic Target Recognition Based on Sia...

引用

42nd Chinese control Conference, CCC 2023

作者： Yang, Haizhou Liu, Meiqin Zhang, Senlin Zheng, Ronghao Dong, Shanling Zhejiang University State Key Laboratory of Industrial Control Technology Hangzhou310027 China College of Electrical Engineering Zhejiang University Hangzhou310027 China Institute of Artificial Intelligence and Robotics Xi'an Jiaotong University Xi'an710049 China

ISBN: (纸本)9789887581543

Underwater acoustic target recognition is a widely investigated issue in the field of underwater acoustics. Many good results have been reported for underwater acoustic target recognition. However, in practical applications, the strong demand for labeled data for underwater acoustic target recognition is a big obstacle. In order to solve this problem, researchers have explored few-shot learning and unsupervised methods in various papers. A Siamese network is proposed which is composed of one-dimensional convolution and Long Short-Term Memory (LSTM) neural networks, called 1DCLSN. A structure for 1DCLSN is designed which combines contrastive information with label information and obtains satisfactory recognition results. In addition, the contrastive loss function with a different clustering term is modified to improve the performance. With only few labeled training samples, the performance of the proposed approach is better than those of other deep learning methods. The experiment shows the great potential of our method. © 2023 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Underwater acoustics

来源：评论

学校读者我要写书评

暂无评论

Fault Detection for Positive Switched Systems with All Modes Unstable 6

Fault Detection for Positive Switched Systems with All Modes...

引用

6th International Conference on Intelligent Robotics and control engineering, IRCE 2023

作者： Su, Qingyu Fan, Zhongxin Li, Jian School of Automation Engineering Northeast Electric Power University Jilin132012 China Jilin Provincial Key Laboratory of Advanced Control Technology of Smart Energy Jilin132012 China School of Automation Southeast University Nanjing210096 China

ISBN: (纸本)9798350326338

Exponential stability, L1-gain performance and fault detection are investigated in this paper for continuous positive switched system (PSS) when there exists no stable subsystems. To eliminate the instability brought by the unstable modes ensure the exponential stbility, a time-driven switching strategy is proposed by means of the average dwell time approach. Then, the L1-gain performance for the PSS is guaranteed. Additionally, the stable filter design is converted into the L1-gain analysis. Sufficient conditions are deduced to guarantee the L1-gain performance with exponential stability in terms of linear matrices inequalities (LMIs). Finally, an example is provided to test and verify the effectiveness and practicality. © 2023 IEEE.

关键词： Lyapunov functions

来源：评论

学校读者我要写书评

暂无评论

A Sequentially-Adaptive Deep Variational Model for Multirate Process Anomaly Detection 3

A Sequentially-Adaptive Deep Variational Model for Multirate...

引用

3rd International Conference on Industrial Artificial Intelligence, IAI 2021

作者： Chai, Zheng Zhao, Chunhui Sun, Youxian Zhejiang University State Key Laboratory of Industrial Control Technology College of Control Science and Engineering Hangzhou310027 China

ISBN: (纸本)9781665435178

Deep learning based process monitoring methods are attracting increasing research attention in recent years, which generally assume that the process variables are uniformly sampled. In practice, however, the process data are generally collected at multiple different rates, resulting in structurally-incomplete training data. Under such circumstances, how to build effective deep models to fully mine the multirate sampled data has become a constraint in achieving better process monitoring performance. In this paper, a sequentially-adaptive deep variational model is designed in which the knowledge that existed in variables with different rates is comprehensively extracted through deep generative neural networks. The multirate samples are first divided into multiple data blocks in which each block is collected at a uniform rate. A deep generative model is then constructed to model the uncertain data distribution and extract probabilistic feature representations considering the slowness principle. To restrain the small data problem in the blocks with slow rates, a sequentially-adaptation strategy is designed to adapt the knowledge from the fast blocks with sufficient training data and enhance the overall modeling performance. The effectiveness is demonstrated through a real-world industrial thermal power plant case. © 2021 IEEE.

关键词： Process monitoring

来源：评论

学校读者我要写书评

暂无评论

Wind Power Yaw control Based on Time Series Kalman Filter 12th

Wind Power Yaw Control Based on Time Series Kalman Filter

引用

12th International Conference on Computer engineering and Networks, CENet 2022

作者： Xie, Weicai Wang, Shiwei Zhao, Peibin Wang, Fang Peng, Lei Zhou, Zhan Hunan Key Laboratory of Wind Turbines and Control Hunan Institute of Engineering HN Xiangtan411104 China Hunan Electrical College of Technology HN Xiangtan411104 China

ISBN: (纸本)9789811969003

Due to the excessive weight of the yaw mechanism, a certain inertia will be generated during steering, resulting in the non continuous deflection of the fan. The fan is in the process of yaw most of the time, which affects the utilization efficiency of wind energy and the service life of the yaw mechanism. In order to reduce the invalid yaw times of the wind turbine, a yaw control method combining the time series prophet model and Kalman filter is proposed. The fusion control method is to preprocess the wind direction with Kalman filter, and then predict the time series to double judge whether the motor is yaw, and integrate it into the yaw control system of wind turbine. Compared with different control methods, the analysis results effectively reduce the yaw frequency of the unit, so as to improve the service life of the yaw mechanism of the unit. It is proved that the fusion control method is effective. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Wind power

来源：评论

学校读者我要写书评

暂无评论

Study of Cracking Mechanism and Wear Resistance in Laser Cladding Coating of Ni-based Alloy

引用

Chinese Journal of Mechanical engineering 2021年第5期34卷 259-272页

作者： Zhenglei Yu Lunxiang Li Deqiang Zhang Guangfeng Shi Guang Yang Zezhou Xu Zhihui Zhang Key Lab of Bionic Engineering Ministry of EducationJilin UniversityChangchun 130022China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130022China College of Mechanical and Electric Engineering Changchun University of Science and TechnologyChangchun 130022China College of Mechanical Engineering and Automation Liaoning University of TechnologyJinzhou 121001China Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process Shenyang Aerospace UniversityShenyang 110136China

Nickel-based alloy coatings were widely used for the remanufacturing of dies and moulds by laser cladding,but the crack sensitivity would be increase due to the higher strength and hardness,which reduced the wear resistance of Ni-based *** this paper,Ni-based coatings with the addition of a plastic phase(an austenitic stainless net)were prepared using laser cladding technology,and the CeO_(2)was added in cladding *** cracking mechanism,microhardness,microstructure,phase composition,and wear properties were *** relationship between thermal stress and the elastic and plastic fracture had been developed from the standpoint of fracture mechan-ics and thermal elastic fracture *** fracture criterion of the nickel-based coating was obtained,and the study has shown that the crack sensitivity could be reduced by decreasing the thermal expansion coefficientΔα.Thus,a new method was proposed,which the stainless steel nets were prefabricated on the *** was found that the number of cracks reduced significantly with the addition of stainless steel *** the stainless steel net with 14 mesh was added in Ni-based coatings,the average microhardness of nickel composite coating was 565 HV_(0.2),which was 2.6 times higher than that of the 45 steel *** the rare earth oxide 4 wt.%CeO_(2)and stainless steel net were added in the Ni-based coating reducing the microhardness(the average microhardness is 425 HV_(0.2)),the wear resistance of it improved *** wear volume of Ni-based composite coating was 0.56×10^(−5) mm^(3)·N^(−1)·m^(−1),which was 85.1%lower than that of 45 *** experiment results have shown that the Nickel-based composite coating is equipped with low crack sensitivity and high abrasive resistance with austenitic stainless net and the rare earth oxide 4 wt.%*** research offers an efficient solution to produce components with low crack susceptibility and high wear-resistance coatings fabricated

关键词： Laser cladding Wear resistance Crack sensitivity Stainless steel net Rare earth oxide

来源：评论

学校读者我要写书评

暂无评论

Design of Ultrasonic Distance Measuring System for Auto Palletizer in Earthquake Rescue Warehouse 7

Design of Ultrasonic Distance Measuring System for Auto Pall...

引用

7th Asia-Pacific Conference on Intelligent Robot Systems, ACIRS 2022

作者： Zhao, Lanying Lan, Xiqiang Su, Boli Zhang, Hexiang School of Electronic Science and Control Engineering Institute of Disaster Prevention China Hebei Key Laboratory of Seismic Disaster Instrument and Monitoring Technology East Yanjiao Beijing China

ISBN: (数字)9781665485197

ISBN: (纸本)9781665485197

In order to ensure the safe use of smart devices such as auto palletizer, unmanned navigation robot, self-operated robot, etc. in modern warehouse, automatic obstacle avoidance and navigation technology have been widely used to measure the spacing between equipment, equipment and warehouse facilities or other obstacles. A design scheme of ultrasonic ranging system based on Tiva C series single chip microcomputer is proposed. Since the frequency of Tiva C series MCU is as high as 80 to 120 MHz, the capacity of time measurement will be enhanced which will improve the measurement accuracy. When the timer is started, the PWM channel is started to drive the ultrasonic transmitter and the capture channel will capture the echo signal. The ultrasonic velocity is adjusted real-time according to the actual environmental temperature. With the system, distance between stacker and the obstacle were calculated in order to determine following motion of the stacker, such as keeping moving or making a sound-light alarm or decelerating to stop, with the pre-design threshold value of distance. Through abundant tests, the system illustrated that it achieved predetermined function, the alarm and stop distance meet the requirements and could be used in the actual environment. © 2022 IEEE.

关键词： Warehouses

来源：评论

学校读者我要写书评

暂无评论

An Energy control Strategy in Hybrid Electric Ships Considering the Battery Life

An Energy Control Strategy in Hybrid Electric Ships Consider...

引用

IEEE International Conference on Industrial Electronics for Sustainable Energy Systems (IESES)

作者： Yucheng Yan Diju Gao Haoyang Jiang Key Laboratory of Transport Industry of Marine Technology and Control Engineering Shanghai Maritime University Shanghai China

Considering the effect of battery life on the full-life-cycle cost of hybrid electric ships (HES), an energy control strategy has been proposed, with the minimization of fuel consumption and battery's health degradation as the optimization objective. Firstly, the double-objectives cost function is established based the diesel engine fuel consumption model, power battery internal resistance model and battery life model. Then, the dynamic programming (DP) algorithm is employed to achieve the global optimization and the optimal weight coefficient is selected according to the optimization results. The experimental results show that, compared with the control strategy based on the single-objective optimization of fuel consumption or the control strategy based on fuzzy logic, the proposed strategy can reduce the fuel consumption and further extend the battery life, and it has good feasibility and practicality.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Modeling and analysis for the deployment dynamic behavior of the large flexible solar array 51

Modeling and analysis for the deployment dynamic behavior of...

引用

51st International Congress and Exposition on Noise control engineering, Internoise 2022

作者： Li, Ning Ma, Xiaolong Zhang, Chongfeng Yang, Fan Liu, Jinglong Zou, Huaiwu Shanghai Institute of Aerospace System Engineering Shanghai China Shanghai Key Laboratory of Spacecraft Mechanism Shanghai China Shanghai Institute of Aerospace Control Technology Shanghai China

ISBN: (纸本)9781906913427

The large flexible solar array for the satellite will deploy when it reaches the scheduled orbit by the space rocket, which is key for the normal running of the satellite. However, undesirable and unpredicted frequency vibration may be resulted from the flexibility of elements of the solar array. In this paper, the dynamic model of the solar panel was firstly developed based on the modal synthesis method. Moreover, the stretchable mechanism in the solar array was introduced by applying Euler-Bounerlli beam theory. Also, guide ropes, hinges and electric cables were considered in the proposed model. It was found the proposed model could achieve a high accuracy of simulation. Especially, the dependence of the guide rope tension on the deployment dynamic behavior of the solar array was explored by this model. Results showed that vibrations of the solar array could be reduced by improving the guide rope tension, which could be used in design and operation of the solar array. © 2022 Internoise 2022 - 51st International Congress and Exposition on Noise control engineering. All rights reserved.

关键词： Rockets

来源：评论

学校读者我要写书评

暂无评论

Simulation of High Temperature Thin Film Thermocouple on Engine Blade Surface

Simulation of High Temperature Thin Film Thermocouple on Eng...

引用

2022 International Conference on Mechatronics and Automation technology, ICMAT 2022

作者： Zhang, Meiju Tian, Bian Ma, Rong Huang, Manguo Liang, Xiaobo Liu, Jiangjiang Zhang, Zhongkai Beijing Changcheng Aeronautic Measurement and Control Technology Research Institute Beijing101111 China Aviation Key Laboratory of Science and Technology on Special Condition Monitoring Sensor Technology Beijing101111 China State Key Laboratory for Mechanical Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an710049 China

ISBN: (纸本)9781643683669

In order to avoid the instability flutter of aero-engine blade and prevent the failure of thin film thermocouple caused by the blade in complex environment, the structural strength of the thermocouple on the actual blade surface was studied in this paper. Firstly, based on the 3D scanning of the real blade, the blade model is established after the point cloud graphics. The surface thermocouple model of the blade is established in Solidworks for simulation, and the modal and harmonic response analysis of the blade is simulated. Secondly, the vibration of the curved thin film thermocouple and the stress distribution of the blade under the acceleration shock were studied in Comsol, and the failure weakness was analyzed to avoid the failure of the thin film thermocouple caused by the bending, fracture or shedding of the thin film thermocouple on the blade due to vibration and shock, providing the most suitable thermocouple selection for the engine blade. © 2022 The authors and IOS Press.

关键词： Thermocouples

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：