Jordan Journal of Mechanical and Industrial Engineering

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JJMIE Volume 15

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Number 1

 


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Editorial Preface


Contents of Number 1
 

Experimental Study on Formaldehyde Emission from Environmental Protection and Energy-Saving Alcohol Fuel for Vehicles

Dandan Liu, Shigang Li, Hui Liu.

 

Abstract: With the further increase of domestic oil demand, the diversification strategy of energy supply represented by alternative energy sources, such as alcohol fuel which has become a direction of China's energy policy. Alcohol fuel can reduce conventional engine emissions by replacing conventional gasoline and diesel, but their unconventional emissions -- formaldehyde -- tend to have higher concentrations than conventional engines. Based on this, this paper analyzed the physical and chemical properties of mixture of methanol and gasoline and its feasibility as an energy fuel, and conducted experiments on formaldehyde emission of gasoline and methanol gasoline respectively, and then obtained a large number of experimental data that studied and analyzed the experimental results and methods, and drew relevant research conclusions. The results show that the high ratio of alcohol fuel can replace the use of chemical fuel and has good energy saving and environmental protection characteristics. When the same fuel is tested, the formaldehyde emission increases first and then decreases with the increase of power. In this paper, a large amount of formaldehyde emission data from alcohol fuel engines are obtained through bench experiments, which provides a scientific basis for the future development of alcohol fuel vehicle combustion system and the formulation of environmental emission standards.

Keywords: engine, alcohol fuel, methanol, unconventional emission, formaldehyde;

 

Design of the Lower Control Arm of an Electric SUV Front Suspension Based on Multi-Disciplinary Optimization Technology

Zhenqi Yu, Huifang Jia, Xingyuan Huang

 

Abstract: An electric SUV is designed and developed based on the original traditional fuel vehicle model. The design scheme of the front suspension lower control arm of prototype vehicle is referred to save the development cycle and cost of the design. The original design scheme is optimized to meet the performance and lightweight requirements. In this paper, the analysis model of lower control arm is firstly established based on the finite element technology to conduct free modal analysis. The results show that the first two modes appear as bending and torsion. The modal frequency is higher than excitation frequency, which satisfies the requirement of vibration characteristics. Then free modal test on lower control arm is carried out based on hammer method, and the test results show that the accuracy of the analysis value is high. Then, the front suspension dynamics model of electric SUV model is established to extract the load of lower control arm. The inertial release method is applied to analyze its limit strength, the results show that its maximum stress is lower than its used stress which meets the requirements of strength design. Finally, the multidisciplinary optimal design of lower control arm is carried out to obtain the best design scheme. After optimization, both modal characteristics and strength characteristics meet the design requirements, and its mass is reduced by 16.7%. And its optimization scheme has passed the bench test and road test certificate successfully, so it has high accuracy and feasibility, providing a new idea for the design and development of the lower control arm, the front suspension of electric SUV.

Keywords:lower control arm; modal; inertia release; strength; optimization; bench test;

 

Accurate Modeling and Numerical Control Machining for Spiral Rotor of Double Rotor Flowmeter        

Chunyan Tian, Hai Jiang, Chaochao Chen

 

Abstract: Aiming at the design and manufacturing problems of the spiral rotor of dual-rotor flowmeter, the profile characteristics and forming principles of the spiral rotor are analyzed, and the function equation of its cross-section profile curve is derived. Based on the analysis, a mathematical model for machining screw rotor with spherical milling cutter is established and the accurate three-dimensional modeling of spiral rotor parts is realized by using UG software. The simulation of the two rotors proves that the modeling method is reasonable and effective. Then using automatic programming and manual programming methods, a multi-axis NC machining program for the parts is written. The macro variable is introduced for the main program to call many times, which greatly simplifies the program structure, reduces the amount of program, and is easy to modify. The NC machining experiment of the spiral rotor with a standard ball-end milling cutter on a four-axis milling machining center is conducted. The results show that the screw rotor machined by the mathematical model has good quality. This programming and manufacturing method is very suitable for processing spiral rotors in multi-variety small batch production, and thus a high machining accuracy can be achieved.

Keywords:spiral rotor; functional equation; digital modeling; NC programming; multi-axis simultaneous machining;

 

Simulation Analysis of the Effects of EGR Rate on HCCI Combustion of Free-piston Diesel Engine Generator

Chunhui Liu, Kechuan Yi

 

Abstract: The effects of exhaust gas recirculation (EGR) rate on homogeneous charge compression ignition (HCCI) combustion and emission of free-piston diesel engine generator (FPDEG) was investigated by using a three-dimensional (3-D) computational fluid dynamics (CFD) model of FPDEG. In the 3-D CFD model of FPDEG, the diesel mechanism with 109 species and 543 reactions was incorporated into the combustion model, and the soot and NOx production were calculated by Hiroyasu-NSC model and 12 steps NOx model. The simulation results showed that the EGR rate had great influence on the HCCI combustion and emission performance of FPDEG. As the EGR rate was changed from 0 to 10%, the HCCI combustion phase of FPDEG slightly lagged, the peak value of heat release, the maximum in-cylinder temperature and pressure and the NOx content significantly decreased, but SOOT content increased. When the EGR rate was 20%, the HCCI combustion of FPDEG was incomplete, and the UCH, SOOT and CO content all obviously increased.

Keywords:Free-piston diesel engine generator, Homogeneous charge compression ignition, diesel mechanism, exhaust gas recirculation;

 

Space Trajectory Planning of Electric Robot Based on Unscented Kalman Filter       

Chang Kuang, Xiaoyi Zheng

 

Abstract: Abstract: The effects of exhaust gas recirculation (EGR) rate on homogeneous charge compression ignition (HCCI) combustion and emission of free-piston diesel engine generator (FPDEG) was investigated by using a three-dimensional (3-D) computational fluid dynamics (CFD) model of FPDEG. In the 3-D CFD model of FPDEG, the diesel mechanism with 109 species and 543 reactions was incorporated into the combustion model, and the soot and NOx production were calculated by Hiroyasu-NSC model and 12 steps NOx model. The simulation results showed that the EGR rate had great influence on the HCCI combustion and emission performance of FPDEG. As the EGR rate was changed from 0 to 10%, the HCCI combustion phase of FPDEG slightly lagged, the peak value of heat release, the maximum in-cylinder temperature and pressure and the NOx content significantly decreased, but SOOT content increased. When the EGR rate was 20%, the HCCI combustion of FPDEG was incomplete, and the UCH, SOOT and CO content all obviously increased.
Keywords:Free-piston diesel engine generator, Homogeneous charge compression ignition, diesel mechanism, exhaust gas recirculation;
 

Keywords:Kalman filter; Electric robot; Space track; Mobile trajectory planning;

 

The Electric Vehicle Torque Adaptive Drive Anti-Skid Control Based on Objective Optimization

Yingqi He

 

Abstract: The vehicle is interfered by the lateral wind in the traditional anti-skid control method, which results in a bad anti-skid control effect of electric vehicle torque drive. For this reason, a method of torque adaptive drive anti-skid control for electric vehicle is proposed. In order to realize the driving force control of distributed driving electric vehicle, the driving motor is modeled and simplified. A battery model was established to analyze the influence of the bus voltage fluctuation on the motor torque response. The power system model is added to the existing vehicle model to complete the simulation model design of the distributed drive electric vehicle. According to the characteristics of the friction circle of the tire, the driving torque of the driving wheel is analyzed. In order to resist the influence of interference factors on vehicles during vehicle movement, through the concept of vehicle stability control, the left and right driving torque is dynamically adjusted by using the obtained ideal driving force distribution ratio of front and rear axles. The simulation results show that the proposed method can effectively increase the driving torque and improve the fitting coefficient of the driving anti-skid torque.

Keywords:Distributed drive; Drive skid control; Driving force distribution; Dynamical system modeling;

 

The Role of Double-Cylinder Insulation Technology in Ensuring the Quality of Bored Pile Concrete under Negative Temperature Condition

Ziying Liua, Tianlai Yu, Ning Yan, Zhihai Piao, Hongxiang Zhang

 

Abstract: In this paper, the cement concrete with low heat of hydration was prepared by adding fly ash, and then used in the double-cylinder insulation technology. Based on heat dissipation test, thermal conductivity test and low temperature strength test of the prepared concrete, the growth law of concrete strength under negative temperature condition was studied. The strengths of three concrete test piles at the corresponding temperature were measured by ultrasonic method, and the influence law of double-cylinder insulation technology on the change of concrete strength was studied. The results show that the curing temperature dropped from 20C to -3C, -5C and -7C on the 28th day. Compared with the standard curing temperature, the strength loss was 29.7%, 31.7% and 42.8%, respectively. There were similar rules on the 60th day and 28th day. In the first 7 days, the temperature of low hydration heat concrete was 1. ~2.8°C lower than that of ordinary concrete. From the 7th day to the 28th day, the temperature of low hydration heat concrete was 0.5°C higher than that of ordinary concrete. After applying the double-cylinder insulation technology to the concrete, the temperature was increased by 7.9°C, 7.3°C and 4.8°C in 0~3rd day, 3rd~7th day and 7th~28th day, respectively. Compared with strength on the 28th day, the strength of low-hydration heat concrete was 2.15% higher than that of ordinary concrete. After applying polyurethane insulation layer, the strength of the low-hydration heat concrete increased by 18.6% compared with that of the low-hydration heat concrete without insulation layer.
 

Keywords:negative temperature, concrete, low heat of hydration, heat preservation, temperature of foundation pile, strength;

 

Wear Properties of Aluminum Alloy 211z.1 Drilling Tool

Yong Liu, Lin He, Sen Yuan

 

Abstract: In the application process of China’s independently produced new aluminum alloy 211z.1 into high-end military and civilian industries, a great many holes are needed for fastening connection. However, the severe wear of the cutting edge of twist drill is an important factor that restricts the quality of hole processing and tool life. In this paper, the wear condition of the standard high-speed steel twist drill in drilling the new aluminum alloy 211z.1 is studied based on the drilling test, and the influence law of the drilling amount on the tool wear is revealed by designing a reasonable drilling test plan. The research results show that the cutting speed has a significant effect on the flank wear, and the drilling feed and the drilling height have relatively little influence on the flank wear of the tool.
 

Keywords:Aluminum Alloy 211z.1; High-speed Steel; Standard Twist Drill; Drilling Test; Flank Wear;

 

Calculation Method of Stiffness and Deflection of Corroded RC Beam Strengthened by Steel Plate

Qian Zhang, Huang Tang, Shihui Guo

 

Abstract: Abstract: In the application process of China’s independently produced new aluminum alloy 211z.1 into high-end military and civilian industries, a great many holes are needed for fastening connection. However, the severe wear of the cutting edge of twist drill is an important factor that restricts the quality of hole processing and tool life. In this paper, the wear condition of the standard high-speed steel twist drill in drilling the new aluminum alloy 211z.1 is studied based on the drilling test, and the influence law of the drilling amount on the tool wear is revealed by designing a reasonable drilling test plan. The research results show that the cutting speed has a significant effect on the flank wear, and the drilling feed and the drilling height have relatively little influence on the flank wear of the tool.

Keywords:Steel Plate, Corroded RC Beam, Strengthening, Stiffness, Deflection, Calculation Method.;

 

Electromechanical Coupling Model of AC Asynchronous Motor Drive System Based on Multiscale Method

Qiuping Pan, Jiaxiang Zhang

 

Abstract: Due to the development of motor drive system towards high power, integration and high-power density, this model cannot control mechanical vibration caused by electromechanical coupling. A new electromechanical coupling model of alternating current (AC) induction motor drive system is proposed. The transient characteristics of the motor were studied by multi-scale method, and the electromechanical coupling dynamic characteristics of the drive system were extracted. According to the dynamometer, the impact load is applied to the drive system, which causes the load on the inertial flywheel to suddenly increase by 3.5 times from 2500 Nm. The service coefficient of the realization shaft is defined as the ratio of the measured post-impact torque to the average pre-impact torque. The experimental results show that when the AC asynchronous motor's influence is passed through the electromechanical coupling model, the difference between the input and output shafts of the gearbox is minimal, and when the AC asynchronous motor's influence is different, the input and output shafts of the gearbox are maximum. It can be seen that the electromechanical coupling model established in this paper can control the mechanical vibration caused by electromechanical coupling and convert the internal load threat to the external load threat

Keywords:multiscale method; AC asynchronous motor; drive system; electromechanical coupling model;

 

Impact Evaluation of Industrial Energy Consumption Based on Input-output Complex Network

Ren Zhou, Xinhua Wang

 

Abstract: Target control and industrial transfer are important methods to regulate energy conservation and emission reduction in the region, so measuring the influence of each industry to energy consumption is the basis of regional industrial structure adjustment. Firstly, an energy flow network model is constructed based on the theory of Industrial Complex Network. It describes the mutual input and consumption of material and energy among industrial sectors. Then, the index system is designed to evaluate the influence of each industry on energy consumption in the economic system. According to the evaluation, methods are searched for to regulate energy-saving and emission-reducing on the industrial level. Based on the data of Shandong Province, the strategies of energy saving and emission reduction are put forward: research and develop new technologies; Sort management, focusing on the control of “key industries”, and paying attention to the industries that consume less energy but relevant more with others appropriately; Rational layout industry, optimize industrial structure and so on.


Keywords:energy consumption; energy flow network; Shandong province; evaluation of industrial impact;

 

A New Method to Analyze CNC Lathe Faults Based on Gutenberg–Richter Curve

Jie Yu, Zhiwei Zhu, Tiebin Wang, Yue Yao, Jiexiang Ding

 

Abstract: This paper collects and sorts out a large amount of fault data of a series of CNC lathes, and analyzes the fault data to classify fault levels. The values of a and b are obtained by Gutenberg–Richter (G-R) curve fitting, and then the relationship between a and b is used. The b value under each division criterion is obtained. By analyzing and comparing these b values, the rationality of classifying the fault levels according to these three methods is verified. The b-value is towards 1.0 when the reliability level of CNC lathes was promoted through ten years' reliability promotion.


Keywords: Gutenberg–Richter (G-R) curve; b value; CNC machine tool; fault level; reliability;

 

Analysis of Activity Parameters of CNC Machine Tools Failures Based on Gutenberg–Richter Curve

Jie Yu, Zhiwei Zhu, Tiebin Wang, Yue Yao, Jiexiang Ding

 

Abstract: Gutenberg–Richter (G-R) scaling relations are commonly used on seism prediction. The variance of b-values can reflect the seism active degree of the area. B value in frequent failure time is lower than in stable failure time. We use the curve to calculate the values of parameters a and b in the Gutenberg–Richter (G-R) relation, draw a graph of the b-value and the ratio of the number of failures over time, and find that the trend is reversed, which prove that the b-value can reflect the ratio of the number of failures. Draw the trend curve of a-value and lgN. By comparing and finding the same trend, it is proved that the a-value can reflect the overall level of failure data. The relationship between a and b-value is analyzed and the influencing factors on activity parameters are discussed.


Keywords: CNC machine tool, Gutenberg–Richter (G-R) curve, a-value, b-value, Gutenberg–Richter (G-R) scaling relation;

 

Fault Status Information Monitoring Technology for Large Complex Electromechanical System

Baoli Wei, Hongtao Jiao

 

Abstract: In order to improve the accuracy of fault state monitoring of electromechanical system, a fault state informatization monitoring technology for large complex electromechanical system is proposed. Based on the standard PD (Partial Discharge) signal expression derived from the traditional communication theory, the characteristic value of the fault signal is calculated, and the feature of the fault state signal is extracted by using the functions of the time and frequency of the fault state of the electromechanical system. Experimental results show that compared with the information monitoring technology based on support vector machine, the proposed fault monitoring technology has a higher monitoring accuracy.


Keywords: complex electromechanical; system fault state; informatization; monitoring technology;

 

Method of Power Performance Fault Alarm of Hybrid Electric Vehicle Based on Hydraulic Technology

Wenjuan Liu

 

Abstract: Due to the lack of precision in the modeling of the vehicle power system, the fault diagnosis and alarm accuracy of the current hybrid vehicle dynamic performance fault alarm method is reduced. Therefore, a hybrid vehicle dynamic performance fault alarm method based on hydraulic technology is designed. The power system model of hybrid electric vehicle is built by hydraulic technology, which is the data base of fault diagnosis. The method of self-diagnosis and the knowledge base of fault diagnosis are used to realize the fault diagnosis of vehicle power system. The interface between mobile network and on-board information is selected to realize vehicle fault alarm by setting alarm information content. The fault diagnosis accuracy of this method is always between 88.5% and 94.5%, the fault diagnosis time is less than 0.5 s, and the highest effective failure alarm rate is 99.8%. The experimental results show that the research method has the advantages of high accuracy, short diagnosis time, high effective alarm rate, low cost, superior economic performance and good application effect.


Keywords: hydraulic technology; hybrid vehicle; fault diagnosis; fault early warning; power system modeling; mobile network;

 

Mould Pollution Control Model of Aluminum Alloy Equipment Considering Ultraviolet Radiation Intensity

Wenbo Yang, Gang Li

 

Abstract: Due to the particularity of the aluminum alloy equipment material, it is extremely susceptible to mold corrosion and corrosion in the case of external environmental pollution, affecting the performance of the equipment. Taking the aluminum alloy equipment contaminated by mold as the research object, the control model of mold contamination was constructed under different ultraviolet irradiation intensity. This includes separating and purifying from corrosion samples of aluminum alloy, and obtaining test culture strains, measuring the change of pH value in the corrosion medium, and then studying the growth characteristics of Aspergillus niger in pure Chagas medium. Through electrochemical testing and surface morphology analysis, the growth and corrosion behavior of mold on the surface of aluminum alloy were studied. It is essential to change the irradiation intensity and irradiation time of ultraviolet ray to study its control effect on aluminum alloy mold corrosion. The experimental results show that the sterilization effect is the most effective and economical when the UV intensity is 84000 μW/cm2 and the irradiation time is 30 min.


Keywords:Ultraviolet radiation intensity; aluminum alloy equipment; mold contamination; control model; corrosion behavior;

 

Fault Tolerant Control Method of Power System of Tram Based on PLC

Zhenzhen You

 

Abstract: Due to the large fault classification granularity of tram power system, there is still a problem that the gain coefficient is not reasonable in different control links, so a fault-tolerant control method of tram power system based on PLC is designed. First, the fault classification of the tram power system is carried out, then the fault diagnosis of the tram power system is carried out. Finally, the fault-tolerant control of the tram power system is carried out through the angle fault-tolerant control unit, PID control algorithm model and brake pull fault-tolerant control unit, as to complete the fault-tolerant control of the tram power system based on PLC. The experimental results show that the reasonable value of proportional gain coefficient, integral gain coefficient and differential gain coefficient are 30.00, 15.00 and 29.98 respectively.


Keywords:PLC; tram; Power system; Fault-tolerant control; Fault diagnosis;

 

Design of Mechanical and Electrical Control System of Mixed Liquid Gas Pressure Energy Storage Based on Maximum Power Point Tracking

Jia Zhang

 

Abstract: In order to solve the problem that the accuracy of the controller of the traditional mechanical control system is not high and the efficiency of the control system is too low, a mechanical control system based on maximum power point tracking is designed. Through the controller platform, the embedded microprocessor with arm architecture is used to design the basic peripheral circuit, and to improve the control accuracy of the controller, and to complete the hardware design of the system. According to the characteristics of the compression efficiency of the liquid pump, the energy storage device is modeled, the maximum power point tracking algorithm is used to control the speed of the motor, and the software design of the system is completed. Regarding the hardware and software design of the system, the mechanical and electrical control system design of the mixed liquid gas pressure energy storage device is realized. The experimental results show that the design system is basically consistent with the standard control value, the system efficiency is the largest, and the mechanical and electrical control accuracy of the mixed oil and gas energy storage is improved, and the active power can reach a stable state.


Keywords:Maximum power point tracking; Mixed liquid gas pressure energy storage machine; Control system; Efficiency value;

 

 

 

 

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