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3rd IEEE International Conference on Electronic Technology, Communication and Information, ICETCI 2023

作者： Yuheng, Han Qiu, Xia Guangzhong, Hu Ping, Wang Sichuan University of Science & Engineering College of Mechanical Engineering Yibin China Sichuan University of Science & Engineering Sichuan Provincial Key Lab of Process Equipment and Control College of Mechanical Engineering Yibin China Sichuan University of Science & Engineering Key Lab. of Adv. Mfg. Technol. of Panzhihua City Sichuan Prov. Key Lab of Proc. Equip. and Control College of Mechanical Engineering Yibin China

ISBN: (纸本)9798350398410

Piston compressors are widely used in chemical industry and other fields. At present, the market puts forward a working condition requirement for piston compressor to adapt to the change of intake air volume. However, the classical PID control has shortcomings in stability time, anti-interference and PID parameter online tuning, which does not meet the requirements of working conditions. Therefore, this paper designs the adaptive control system of the intake air volume of the piston compressor according to the variable speed air volume regulation strategy and establishes a mathematical model. Using BP neural network and fuzzy control theory, a fuzzy neural network PID controller is built. Using Matlab/Simulink, a step response simulation experiment is carried out. Using C# language, the upper computer of the system is programmed. The simulation results show that the stability time of the intake air volume adaptive control system based on the fuzzy neural network PID controller is 1.63 seconds, which is 0.55 seconds and 1.6 seconds faster than that of the intake air volume adaptive control system based on the adaptive fuzzy PID controller and the classical PID controller respectively, and its anti-interference ability is stronger, which is more suitable for the realization of the intake air volume adaptive control system controller under this working condition. © 2023 IEEE.

关键词： Fuzzy neural networks

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Numerical Investigation of Boundary Grid Effect on Heat Transfer Computation of RP-3 at Supercritical Temperature of Helical Tube Wall

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Journal of Thermal Science 2021年第2期30卷 504-516页

作者： LIU Shaobei BAO Zewei HUANG Weixing ZENG Tao QIAO Min MENG Jiancheng School of Chemical Engineering Sichuan UniversityChengdu 610065China School of Mechanical Engineering Sichuan University of Science&EngineeringZigong 643000China Sichuan Provincial Key Lab of Process Equipment and Control Zigong 643000China

To get reliable computational results,the RNG k-ε turbulence model with enhanced wall treatment was validated to solve the heat transfer of supercritical RP-3 in a helically coiled tube,and models of the thermo-physical properties of RP-3 were optimally *** significantly,the grid independence was validated by two-step procedure,and the effect of boundary grids of the supercritical-temperature wall on the computational accuracy was well *** adjusting boundary-layer girds' size,four regions (increased,pseudo-convergence,decreased and convergence) of the outlet temperature Tout were obtained and *** results showed that the maximum computation errors of Tout and the pressure differential between the inlet and outlet ΔP reached 20.65% and 98.15%,respectively,indicating that boundary grids have a significant influence on computation of flow and heat *** on this,a dimensionless distance from the wall-adjacent cell to the wall y+=Prw-1/1.78 (Prw denotes Wall Prandtl number) was recommended as a convergence *** variation laws of viscous length scale y* were discussed under different structural parameters,operation parameters,and helical *** explicit model of y* was proposed to calculate the height (y) of the first boundary layer grids and refine boundary grids efficiently.A modified model for coefficient of fiiction factor Cf was proposed based on Rogers's,and Nusselt number Nu was proposed based on an analogy of momentum and heat *** above models about y*,Cf and Nu could apply to both the entrance region and the whole tube length,and showed good performance when Reynolds number was extended to above 70 000,or whenever the outlet temperature is below or above the critical point.

关键词： supercritical heat transfer helically coiled tube aviation kerosene dimensionless wall distance viscous length scale

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Experimental and Internal Flow Investigation on the Performance of a Hydraulic Retarder with Different Liquid-Filled Amount and Blade Inclination Angles

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Journal of Thermal Science 2022年第3期31卷 923-933页

作者： DAI Cui DONG Liang ZHANG Xing ZHU Jiancheng LIN Haibo School of Energy and Power Engineering Jiangsu UniversityZhenjiang212013China Sichuan Provincial Key Lab of Process Equipment and Control Sichuan University of Science&EngineeringZigong643000China Research Center of Fluid Machinery Engineering and Technology Jiangsu UniversityZhenjiang212013China Pipeline Research Design Center PipeChina North Pipeline CompanyLangfang065000China

In order to study the variation of brake torque,vibration,pressure fluctuation,exterior noise and internal flow for a hydraulic retarder with different inclination angles and liquid-filled amount,a bench-scale hydraulic retarder was *** INV3020 data collection system was used for the synchronous acquisition of brake torque,vibration,pressure fluctuation and exterior noise *** were performed with different inclination angles(90°and 75°)and six liquid-filled amount(50 vol%,60 vol%,70 vol%,80 vol%,90vol%and 100 vol%).The torque-volume ratio was proposed to accurately analyze the influence of inclination angle on the liquid volume in stator and rotor and the brake *** multiphase flow model was employed to capture the volume and velocity *** research shows that the brake performance improves and the vibration increases with the decrease of inclination angle and the increase of liquid-filled *** pressure fluctuation increases as the liquid-filled amount increases,while the lower inclination angle effectively lowers the pressure fluctuation *** sound pressure level trends upward with increasing liquid-filled amount,and the lower inclination angle can effectively reduce the *** volume distribution of the liquid phase under different liquid-filled amount is basically *** lower inclination angle can induce more vortexes.

关键词： hydraulic retarder blade inclination angle liquid-filled amount brake torque vibration pressure fluctuation noise numerical calculation

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Design of Adaptive control System for Intake Air Volume of Piston Compressor Based on Fuzzy Neural Network PID controller

Design of Adaptive Control System for Intake Air Volume of P...

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Electronic Technology, Communication and Information (ICETCI), IEEE International Conference on

作者： Han Yuheng Xia Qiu Hu Guangzhong Wang Ping College of Mechanical Engineering Sichuan University of Science & Engineering Yibin China College of Mechanical Engineering Sichuan University of Science & Engineering Sichuan Provincial Key Lab of Process Equipment and Control Yibin China College of Mechanical Engineering Sichuan University of Science & Engineering Key Laboratory of Advanced Manufacturing Technology of Panzhihua City Sichuan Provincial Key Lab of Process Equipment and Control Yibin China

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Research and development of the control system of space multi-dimensional profiling and planing based on PLC

Research and development of the control system of space mult...

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作者： Qiu Xia Guangzhong Hu Yuheng Han Ping Wang College of Mechanical Engineering Sichuan University of Science & Engineering Sichuan Provincial Key Lab of Process Equipment and Control Key Laboratory of Advanced Manufacturing Technology of Panzhihua City

Aiming at the complex processing problem of a rectangular composite plate with warpage in space to remove both sides of the frame and ensure the maximum of the inner core plate of the composite plate after removing both sides of the frame,a space multi-dimensional profiling and planing control system based on PLC is *** to the process requirements,the overall design of the space profiling and planing system is carried out,focusing on solving the problem of planing the space warping of the composite board *** the aspect of system hardware,the scheme selection,mechanical structure design,pneumatic control scheme design and electrical control scheme design are carried out;In the aspect of system software,based on the TIAPortal software platform,the PLC profiling program is compiled,and the human-computer interaction of the touch screen is *** profiling and planing process of composite plate is realized on the prototype,which improves the production efficiency while realizing automation.

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Channel geometry and throttling regulation effects on printed circuit Joule-Thomson cryocooler performance

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Applied Thermal engineering 2025年 274卷

作者： She, Hailong Hu, Guangzhong Cui, Xiaoyu Liu, Zhongbin Li, Hang Peng, Di Zhao, Zhe Yin, Peng College of Mechanical Engineering Sichuan University of Science & Engineering Yibin644000 China Sichuan Provincial Key Lab of Process Equipment and Control Engineering Yibin644000 China College of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai200093 China

To solve the shortcomings of the current microchannel Joule-Thomson (J-T) cryocooler, such as monotonous channel configurations and limited parallelization, this study integrates printed circuit heat exchanger fabrication technology with distributed throttling refrigeration theory. A distributed J-T effect cryocooler featuring a multi-rectangular microchannel parallel structure was successfully developed. Performance investigations were conducted with the cryocooler as the prototype. By analyzing the thermodynamic parameter evolution of Ar at critical nodes, the weak link of the prototype was identified: the low J-T coefficient μjt at the throttling inlet limits overall efficiency. To resolve this, a dual optimization strategy was proposed. First, topology optimization of the channel form of the counterflow heat exchanger was implemented to enhance precooling. The results show that the airfoil fin channels exhibit superior performance compared to other configurations. When the inlet parameters are 6.0 MPa and 285.0 K, compared with the prototype, the cold-end temperature decreases from 194.9 K to 167.8 K, the J-T efficiency is increased from 49.1 % to 56.1 %. the airfoil geometry intensifies heat transfer, thereby promoting more significant distributed J-T effect and heat transfer coupling in the throttling section, which is the key to improving refrigeration performance. In addition, length ratio optimization between counterflow heat exchanger and throttle was explored. The results show that increasing the length ratio of the throttling channel can effectively suppress the limit velocity of the fluid, thus delaying the occurrence of choked flow. Conversely, reducing this proportion lowers the cold-end temperature. constrained by choked flow limits, the minimum throttling length under the conditions described in this study is 12 mm, achieving a further temperature drop to 136.4 K, with peak J-T efficiency (74.1 %) and heat flux (2.77 W/mm). The established dual opti

关键词： Refrigeration

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Influence of Riboflavin on the Corrosion of X80 Pipeline Steel by Sulfate Reducing Bacteria

SSRN

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SSRN 2023年

作者： Fu, Lei Lin, Li Yan, Shisen Luo, Yunrong Zhang, Yingqian Lai, Sheng Wang, Zhengguo Tan, Mingxing School of Mechanical Engineering Sichuan University of Science & Engineering Zigong643000 China Failure Mechanics and Engineering Disaster Prevention Key Lab of Sichuan Province Sichuan University Chengdu610065 China Key Laboratory of Deep Earth Science and Engineering Sichuan University Ministry of Education Chengdu610065 China School of Material Science and Engineering Sichuan University of Science & Engineering Zigong643000 China Vanadium and Titanium Resource Comprehensive Utilization Key Laboratory of Sichuan Province Panzhihua617000 China Sichuan Provincial Key Lab of Process Equipment and Control Zigong643000 China School of Civil Engineering Sichuan University of Science & Engineering Zigong643000 China

Sulfate reducing bacteria (SRB) are facultative anaerobic, and the electron transfer process of their growth and metabolic activities is as follows: the electrons released from the metal surface pass through the cell wall into the cell by extracellular electron transfer, and the electron shuttle to the body plays the role of electron transfer between cells and metals. In this study, the effect of riboflavin (RF) as an electron shuttle on SRB corrosion of X80 pipeline steel was analyzed. The results showed that the addition of 10 ppm RF to the SRB medium did not significantly change the type of corrosion products, but resulted in an enlarged corrosion pit area and an increased pit depth. The corrosion weight loss rate of the SRB + 10 ppm RF system is about 3 times that of the SRB system, and the corrosion current density of the polarization curve is about 38% higher than that of the SRB system. Therefore, RF can transfer the electrons released by iron oxidation to the cytoplasm by means of electron transfer across the cell wall, thereby accelerating the corrosion of X80 steel. This further proves that the electronic medium RF can accelerate the microbial influenced corrosion (MIC) caused by SRB. © 2023, The Authors. All rights reserved.

关键词： Electron transport properties

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A Hydraulic Performance Comparison of Centrifugal Pump Operating in Pump and Turbine Modes

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Journal of Thermal Science 2020年第6期29卷 1594-1605页

作者： DAI Cui DONG Liang LIN Haibo ZHAO Fei School of Energy and Power Engineering Jiangsu UniversityZhenjiang 212013China Sichuan Provincial Key Lab of Process Equipment and Control Sichuan University of Science&EngineeringZigong 643000China Research Center of Fluid Machinery Engineering and Technology Jiangsu UniversityZhenjiang 212013China School of Mechanical Research Center of Technology Wuxi Institute of TechnologyWuxi 214121China

The modifications of impeller may show diverse impact on centrifugal pump operating in pump and turbine *** clarify this problem,the hydraulic performance of a low specific speed centrifugal pump operating in both modes was firstly obtained by CFD method and verified by ***,based on the single-factor design method,a series of calculations have been conducted to identify the effects of impeller geometry parameters on the hydraulic performance in different *** variations of head,shaft power and hydraulic efficiency curves with different impeller parameters were *** is found that compared with turbine,the pump shows a more obvious variation of *** outlet angle has positive impact both on the head consumed by pump or generated by *** change of turbine shaft power is apparently smaller than that of pump for different impeller geometry *** the outlet width somewhat changes the turbine shaft *** hydraulic efficiency in both modes shows different variation under different impeller geometric parameters,while the hydraulic efficiency of both modes is reduced with the outlet angle ***,the response amount of hydraulic efficiency caused by certain change of impeller parameters was estimated by sensitivity analysis *** is found that only the appropriate blade number and outlet width can improve the hydraulic performance both in pump and turbine ***,the hydraulic loss,skin friction loss and theoretical analysis were performed to explore the reason of hydraulic performance variation due to different impeller *** change of slip factor,impeller inlet area,impeller outlet area or hydraulic loss results in the change of hydraulic performance in both *** results can be useful for hydraulic performance improvement for both pump and turbine modes through impeller geometry modification.

关键词： Computational Fluid Dynamics centrifugal pump impeller modification pump mode turbine mode

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Anaerobic Granular Sludge in Pilot Spiral Symmetry Stream Anaerobic Bioreactor: Its Physical and Chemical Properties Change Over Time and Space

SSRN

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SSRN 2023年

作者： Ren, Luotong Li, Gongsong Dong, Bin Wang, Zhenxi Xu, Sheng Chen, Siyu Danping, Huang Chen, Xiaoguang Shanghai Frontier Science Research Center for Modern Textiles College of Environmental Science and Engineering Donghua University Shanghai201620 China College of Environmental Science and Engineering Tongji University Shanghai200092 China College of Sciences Nanchang Institute of Technology Nanchang330099 China Sichuan Provincial Key Lab of Process Equipment and Control School of Mechanical Engineering Sichuan University of Science & Engineering Zigong643000 China

Anaerobic granular sludge determines the high performance of the bioreactor. Numerous factors can affect the activity of microorganisms in granular sludge. To study the regionalization of granular sludge in the bioreactor, we established a pilot Spiral Symmetry Stream Anaerobic Bioreactor (P-SSSAB) over 216 days, divided into three zones (I, II, and III) from bottom to top. The temperature is the major factor affecting microbial activity. The monitoring of bed temperature in various zones during 216 days revealed that the microbial activity in I was times and times that in II and III, respectively. The sludge at the bottom of the P-SSSAB had a higher porosity (60.35% ~ 83.27%) and more suitable settling velocity (60 m/h) when the particle size range was in 1.0 to 2.0 mm. This proves the better metabolic activity and more superior settling performance in I than in II and III. In addition, the elemental composition of the granular sludge in various zones were analyzed. The relative content of Fe (5.66%, 3.36%, and 1.38%, respectively) and S (2.47%, 2.19%, and 1.49%, respectively) in I, II, and III tended to decrease with the rising of the P-SSSAB. This also verifies the better mass transfer performance and operational stability at the bottom of the reactor than in the upper layer. © 2023, The Authors. All rights reserved.

关键词： Bioreactors

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An Intelligent Fatigue Life Prediction Method for Aluminum Welded Joints Based on Fatigue Characteristics Domain

An Intelligent Fatigue Life Prediction Method for Aluminum W...

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作者： Zou, Li Li, Hongxin Jiang, Wei Software Institute Dalian Jiaotong University Dalian116002 China Sichuan Provincial Key Lab of Process Equipment and Control Zigong643000 China

In order to reduce the dispersion level of fatigue test samples of aluminum alloy welded joints and further improve the fatigue life prediction accuracy, the concept of fatigue characteristic domain is proposed. Based on the attribute reduction of neighborhood rough set, the division method of fatigue characteristic domain is determined. According to the attribute reduction, the key fatigue life influencing factor set of welded joint is used to divide all fatigue test samples into several sub-domain sets, and each sub-domain set corresponds to a fatigue character sub-field. Support vector machine has the characteristics of simple calculation, perfect theoretical foundation and suitable for small sample problems. Based on its characteristics, an improved support vector machine model for fatigue life prediction of aluminum alloy welded joints is established in the determined fatigue characteristics domain. The experimental results show that compared with the least squares fitting method, the support vector machine model has stronger anti-noise ability and higher prediction accuracy. © Springer Nature Singapore Pte Ltd. 2020.

关键词： Welds

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