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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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A rational approximation method of fractional order differentiators and integrators based on joint optimal criterion

International Journal of Control and Automation

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International Journal of control and Automation 2016年第6期9卷 251-264页

作者： Zhao, Huimin Guo, Chen Deng, Wu Li, Dongyan Yang, Xinhua Zou, Li Information Science and Technology College Dalian Maritime University Dalian116026 China Software Institute Dalian Jiaotong University Dalian116028 China Sichuan Provincial Key Lab of Process Equipment and Control Sichuan University of Science and Engineering Zigong64300 China Artificial Intelligence Key Laboratory of Sichuan Province Sichuan University of Science and Engineering Zigong64300 China

In this paper, a new rational approximation method for fractional-order differentiator aαand integrator sα(0<α<1) is presented. The method is based on the joint optimal rational approximation definition in the given frequency range and the error. First, a definition of joint optimal rational approximation is proposed and the constructing steps of the fractional-order integrator are discussed. Then the approximation algorithm of fractional-order integrator based on the joint optimal rational approximation definition is given. The construction steps of fractional-order integrator are explained by an illustrative example. Finally, the performance comparison result among the proposed approximation model, the Oustaloup's method and the best rational approximation method shows that the amplitude-frequency characteristic and phase-frequency characteristic of the joint optimal rational approximation method are better than the Oustaloup's method and the best rational approximation method. And the proposed model has higher approximation precision. © 2016 SERSC.

关键词： Rational functions

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Development of a grinding carriage for an inner cooling grinding in a general grinding machine

Development of a grinding carriage for an inner cooling grin...

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2013 3rd International Conference on Mechatronics and Applied Mechanics, ICMAM 2013

作者： Zhang, Liang Dong Wang, Yong Li, Zhi Rong Sichuan Provincial Key Lab of Process Equipment and Control Engineering School of Mechanical Engineering Sichuan University of Science and Engineering Zigong Sichuan 643000 China Department of Automotive Engineering ChongQing College of Electronic Engineering Chongqing China

ISBN: (纸本)9783038350309

As inner cooling grinding can break the closure of grinding area and solve practical engineering problems resulting from too high grinding temperature, it can be used to realize the grinding of difficult-to-machine materials, such as Titanium alloy, in a general machine such as M7130. An inner cooling grinding wheel, a grinding carriage and cutting fluid system are the key parts of a inner cooling grinding system, and an inner cooling grinding wheel must be fixed on a plain grinder by a grinding carriage, so this paper mainly studies how to design and manufacture a tooling for an inner cooling grinding wheel, which has simple construction and reliable performance. Grinding experiment shows it can dramatically reduce cutting temperature and effectively avoid grinding burn, thus grinding quality is improved. © (2014) Trans Tech Publications, Switzerland.

关键词： Cooling

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Noise comparison of centrifugal pump operating in pump and turbine mode

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Journal of Central South University 2018年第11期25卷 2733-2753页

作者： DONG Liang DAI Cui LIN Hai-bo CHEN Yi-ping Research Center of Fluid Machinery Engineering and Technology Jiangsu University School of Energy and Power Engineering Jiangsu University Sichuan Provincial Key Lab of Process Equipment and Control Sichuan University of Science & Engineering

Investigations regarding the relation of noise performance for centrifugal pump operating in pump and turbine modes continue to be *** paper presents a series of comparisons of flow-induced noise for both operation *** interior flow-borne noise and structure modal were verified through *** flow-borne noise was calculated by the acoustic boundary element method(ABEM),and the flow-induced structure noise was obtained by the coupled acoustic boundary element method(ABEM)/structure finite element method(SFEM).The results show that in pump mode,the pressure fluctuation in the volute is comparable to that in the outlet pipe,but in turbine mode,the pressure fluctuation in the impeller is comparable to that in the draft *** main frequency of interior flow-borne noise lies at blade passing frequency(BPF)and it shifts to the 9th BPF for interior flow-induced structure *** peak values at horizontal plane appear at the 5th BPF,and at axial plane,they get the highest sound pressure level(SPL)at the 8th *** with interior noise,the SPL of exterior flow-induced structure noise is incredibly *** the 5th BPF,the pump body,cover and suspension show higher SPL in both *** outer walls of turbine generate relatively larger SPL than those of the pump.

关键词： centrifugal pump as turbine noise performance acoustic boundary element method acoustic finite element method

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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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Why synthesizing poly(1,4-phenylene sulfide) through oxidative polymerization has not so far been adopted as the industrial process

Why synthesizing poly(1,4-phenylene sulfide) through oxidati...

引用

Spring International Conference on Material Sciences and Technology, MST-S 2017

作者： Liu, Yefeng Li, Yanfen Yan, Xiaolan Yan, Jie Li, Minjiao Cui, Yishun School of Chemical Engineering Sichuan University of Science & Engineering ZigongSichuan643000 China Sichuan Provincial Key Lab of Process Equipment and Control Sichuan University of Science & Engineering ZigongSichuan643000 China Material Corrosion and Protection Key Laboratory of Sichuan province Sichuan University of Science & Engineering ZigongSichuan643000 China

ISBN: (纸本)9783035710939

Synthesis of poly (1, 4-phenylene sulfide) (PPS) through oxidative polymerization seems promising to us. Comparing with current commercial method to poly (1, 4-phenylene sulfide) from 1, 4-phenylene sulfide and sodium sulfide (Phillips’ Method), there are many advantages of the oxidative polymerization method. For example, it can synthesize PPS at normal temperature and pressure;the yield of reaction is very high;it provides pure PPS without salt contamination. However, several years have passed away;synthesis of poly (1, 4-phenylene sulfide) through oxidative polymerization has not so far been adopted as the industrial process. Many of us are puzzled, why? Through studying all kinds of reported preparation route to poly (1, 4-phenylene sulfide) through oxidative polymerization compared to Phillips’ Method, a generic polymerization mechanism is achieved for most of them excepting two with obvious shortcomings. We suddenly realize that synthesis of poly (1, 4-phenylene sulfide) through oxidative polymerization seems unsuitable to be used in industrial production recently because of its own limits. © 2017 Trans Tech Publications, Switzerland.

关键词： Sulfur compounds

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Design of Adaptive control System for Intake Air Volume of Piston Compressor Based on Fuzzy Neural Network PID controller 3

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

引用

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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Research on Current Situation and Countermeasures of sichuan New Energy Automobile Industry Development

Research on Current Situation and Countermeasures of Sichuan...

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2018 3rd International Conference on control, Automation and Artificial Intelligence (CAAI 2018)

作者： Tao Yang Yinghua Liao Dehui Zhao Sichuan University of Science & Engineering Sichuan Provincial Key Laboratory of Process Equipment and Control Engineering

Based on the situation of the development of new energy automobile industry in sichuan Province, this article analyzes the problems in the development, demonstration and popularization of new energy vehicle industry. Combining sichuan's "13 th Five-Year Plan" strategic emerging industries planning, it puts forward three Countermeasures and Suggestions to speed up the development of new energy automobile industry in sichuan Province. First, break through the core technologies under the guidance of government and cooperation between schools and enterprises. Second, promote the competitiveness of backbone enterprises in sichuan Province and innovate the popularization modes of the market. The last suggestion is to improve the structure of the industry and complete the construction of components supporting system to realize the healthy and sustainable development of the whole automobile industry in sichuan Province.

关键词： new energy automobile industry status supporting system

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Notice of Retraction: Innovation design and optimization scheme of the BF-type flexible drive in using

Notice of Retraction: Innovation design and optimization sch...

引用

International Conference on Computer-Aided Industrial Design and Conceptual Design, CAIDCD

作者： Lingyu Zhang Huailin Luo Guangzhong Hu Sichuan Provincial Key Laboratory of Process Equipment and Control Sichuan University of Science and Engineering Zigong Sichuan China

This article has been retracted by the publisher.

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Conceptual Innovation Design of Novel Intelligent Bicycle Based on Theory of Inventive Problem Solving

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Journal of Beijing Institute of Technology (English Edition) 2017年 26卷 16-20页

作者： Xu, Wenna Hu, Guangzhong Li, Xia School of Mechanical Engineering Sichuan University of Science and Engineering ZigongSichuan643000 China Sichuan Provincial Key Lab of Process Equipment and Control Sichuan University of Science and Engineering ZigongSichuan643000 China

The innovative designs of bicycle have attracted attentions of many researchers. To deal with the shortcomings of insufficient power, single function and low efficiency of energy saving, a conceptual innovation design based on theory of inventive problem solving (TRIZ) is proposed in this *** problem models can be transformed into technical contradiction for establishing the functional unit models of ***, the improving parameters and worsening parameters are systematically analyzed to obtain the recommended innovative principles from contradiction matrix. Moreover, three typical innovative principles are employed for improving the design effects. The results show that the TRIZ based innovative design methods can improve the design efficiency and shorten development cycles directly. © 2017 Editorial Department of Journal of Beijing Institute of Technology.

关键词： Bicycles

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