bluuebunny/crossref_metadata_2025 huggingface dataset:
Numerical Investigation of the Inlet with Different Lip-plane Shapes under Ground Running
Authors: Ge Changjie , Hu Xiao , Shang Yinhui , Xiao Lianghua
Published: August 2021

The inlet of the UAV is usually designed on the back of the aircraft in order to give consideration to the overall arrangement and stealth performance. Under ground running, there are often severe vortices in the duct of the backpack inlet, which leads to low total pressure recovery and large circumferential distortion index at the AIP. Different shapes of the lip-plane produce different vortices, which have great impact on circumferential distortion index at the AIP. In this paper, the characteristics of three different lip-plane shapes were studied under the ground running. Results indicate: (1) W-shaped inlet has lowest circumferential distortion index and the flow distribution is the most uniform at the AIP; (2) Λ-shaped inlet has the weakest of the vortex strength and the largest total pressure recovery, which means the thrust loss caused by the inlet is smallest; (3) V-shaped inlet has the strongest vortex strength and the lowest total pressure recovery.
Fixed Boundary transition effect on transport aircraft aerodynamic characteristics under different Reynolds numbers
Authors: Wang Yuanjing , Lv Binbin , Liu Dawei
Published: August 2021

Scale differences between test models and real aircraft result in Reynolds number effect, which made it impossible to simulate boundary layer conditions and obtain accurate aerodynamic characteristics of vehicles, especially of transport aircraft, by wind tunnel tests. Normally, laminar flow would exit over super critical wing during wind tunnel tests. Fixed transition effect on super critical wing aerodynamics characteristics was investigated in traditional wind tunnels. The relative experiments were conducted in a transonic wind tunnel. Force/moment and surface pressure distribution were measured with a full model and a half model respectively. Test Mach number ranged from 0.7 to 0.86, and Reynolds number ranged from 3.3 million to 16.5 million. Experiment results showed that surface pressure distribution would be changed significantly by fixed transition when shock wave and induced boundary layer separation appeared on upper surface. With the increasing of test Reynolds numbers, its effect became weakened, and the effect was ignorable when test Reynolds number exceeded 15 million. To obtain credible wind tunnel results, fixed boundary layer transition of super critical airfoil were recommended when test Reynolds numbers were less than 15 million.
Detached eddy simulation of the release progress of moving body separating from a cavity
Authors: Li Huan , Jia Hongyin , Cui Pengcheng , Chen Jiangtao , Zhou Guiyu , Zhang Yaobing
Published: August 2021

Aiming at the complex unsteady flow during the release progress of moving body separating from a cavity, combined with the overlapping grid technique and Spalart Allmaras equation turbulence model, the three-dimensional unsteady flow solver is presented. On this basis, the validity of the simulation method is verified by M219 cavity example and WPFS example. Then the released moving body is conducted with SA-IDES. The research results show that upward force and pitch down moment of the moving body are affected by the fluctuating flow near the cavity and the SA – DES simulation is good in predicting high frequency flow. In conclusion, the outside shear layer and the inside fluctuating flow of the cavity has a significant impact on the aerodynamic loads and the trajectory of the moving body during the initial separation stage.
Experimental study of underwater vehicle’s dissolved gas wake
Authors: Wang Yun , Zhu Haixiong , Wu Jianwei , Dong Liang
Published: August 2021

In order to maintain the internal environment, underwater vehicles continue to emit carbon dioxide. Carbon dioxide dissolves in water to form dissolved carbon dioxide wake characteristics. Based on a self-designed and built experimental bench, a model experiment of dissolved carbon dioxide produced by the underwater vehicle was carried out. The effects of carbon dioxide emission flow and speed of the vehicle on the characteristics of dissolved carbon dioxide wake are analysed. The results showed that, due to the carbon dioxide emissions of the underwater vehicle, the area passed by the underwater vehicle formed a wake containing dissolved carbon dioxide. The dissolved carbon dioxide wake of the underwater vehicle lasts for a long time, that is, in the area far behind the underwater vehicle, the characteristic of dissolved carbon dioxide is still obvious enough to be detected by the detector. In addition, the wake characteristics of dissolved carbon dioxide when the propeller is rotating and when it is not moving are compared. The results show that the mixing action of the propeller has a great influence on the characteristic distribution of dissolved carbon dioxide.
Multi-Objective Optimization Design of Liftbody Aircraft Using Kriging Model
Authors: Xu Liang , Zhang Bin , Chen Bin , Wu Peng
Published: August 2021

The evolutionary algorithm combined with Kriging surrogate model is applied to aerodynamic optimization design of high-altitude hypersonic aircraft. In this paper, a 3D liftbody aircraft in cruise flight state is designed which divided into forebody/inlet, engine and after-body/nozzle parts, and its variable parameterization method is studied by considering the multi-disciplinary coupling effect of airframe/engine integration; four disciplines analysis model, i.e. engine propulsion performance, the forebody/inlet air-breathing performance, aerodynamic force and thermodynamics, are established and the appropriate objective parameters are selected, then genetic algorithms are used to optimize the design. The single-objective optimization results show that the performance of aircraft is effectively improved; the multi-objective optimization results reveal that the total trade-off is achieved.
Hydrodynamic Engineering Calculation of Hull Suction Volume in the Backflow of Cascade Angle Region
Authors: Hui Jie
Published: August 2021

This article uses computational fluid dynamics (CFD) method to carry out a numerical study on a rectangular high-load diffuser cascade of a ship hull with a full-blade high suction trough unit at different chord positions, and analyses the chord position and other parameters of the suction trough. The influence on the distribution law of the suction volume; the effect of the local extended suction scheme is explored through the cascade experiment. The computational domain of the numerical simulation includes the vacuum cavity inside the suction blade, and the boundary conditions are set according to the experimental conditions. The distribution law of the suction volume along the span is affected by the combined effect of the cascade flow path and the flow field of the blade cavity. Therefore, the suction surface suction groove/hole should be refined according to the specific characteristics of the three-dimensional high-load diffuser cascade flow field design.
Numerical Simulation Coupling on Fluid Flow and Heat Transfer in Nozzle and Equipment Cabin of Solid Rocket Motor during Operation Process
Authors: Ni Zheng , Wu Yue , Liu Yang , Zhu Pengfei
Published: August 2021

Driven by the goal of studying the temperature changes in the nozzle and equipment cabin of solid rocket motor during the whole process of ignition starting, working, cooling and decompression, this paper uses the fluid dynamics software which uses the RNG k-ε turbulence model to simulate the mixing of the fuel and oxidant and the Sutherland law to describe the viscosity of gas and air, and the controlling equation is the two-dimensional axisymmetric viscous compressible URANS equation. In this paper, the temperature field of the nozzle and equipment cabin in the working process of solid rocket motor during 0 ∼ 60s is numerically simulated, and the ground experiment is carried out. The results show that (1) the numerical simulation results are in good agreement with the ground test results, and the absolute value of the maximum error appears at the time of 60s, which is 5.9k. indicating that the numerical calculation method and heat source equivalent method established in this paper are suitable for the temperature field simulation of composite structure nozzle and equipment cabin, (2) the unsmooth surface of the nozzle formed by high temperature ablation makes the flow situation in the divergent section of the nozzle complex and affects the heat transfer coefficient of the wall contacting with the equipment cabin, (3) due to the insulation design of the equipment cabin, only a small part of the heat is transferred to the equipment cabin. During the whole working process of solid rocket motor, the temperature field of equipment cabin increases sharply at both ends and gently in the middle.
Review of state of the art in active aerodynamic control research for vehicles
Authors: Gao Wei , Kong Xinxin , Deng Zhaowen , Yu Wei , Wu Yongxing , Luo Jintao
Published: August 2021

Various active safety systems have been developed and applied to improve the driving safety of road vehicles under emergency scenarios. However, the functions of these active safety systems are limited due to the forces saturation between the tires and the road under high lateral accelerations or on low adhesion roads. To further enhance the safety of high-speed vehicles, the active aerodynamic control system was proposed and studied by engineers and researchers. An overview of the state of the art and present status of active aerodynamic control research for vehicles is presented in this paper. The influence of the active aerodynamic control on the dynamic properties of road vehicles, vehicle models used for active aerodynamic control systems, the control system and controller are summarized in this paper. The future research efforts are discussed. The paper is to provide some guidance for the further investigations of the active aerodynamic control system.
A high-fidelity polynomial chaos modified method suitable for CFD uncertainty quantification
Authors: Chen Jiangtao , Zhang Chao , Zhao Wei , Wu Xiaojun
Published: August 2021

There are many sources of uncertainty in the process of numerical simulation for engineering configure. Evaluating and quantifying the uncertainty of simulation results is very important for the design and evaluation process of the industrial department. The non-intrusive polynomial chaos method is a commonly used uncertainty quantification method, but a polynomial chaos with high accuracy requires a sufficient number of high-fidelity samples, which causes “dimension disaster” for high-dimensional problems. This paper proposes a modified method. First, a low-fidelity calculation model is used to generate a low-fidelity polynomial chaos, and then a small amount of high-fidelity calculation data is used to modify the low-fidelity polynomial chaos. This method is used to analyze the parameter uncertainty of the SA model in the RAE2822 airfoil calculation. Under the premise of effectively ensuring the accuracy, the calculation time is reduced by 60% compared with the method of using the full high-fidelity calculation model.
Research on a hydraulic displacement amplifier for a piezoactuator
Authors: Xu Youxiong , Zhou Hao , Zhu Songqing , Pan Ge
Published: August 2021

A piezoactuator-based hydraulic displacement amplifier with two flexible diaphragm spools and one rigid chamber is designed. The elastic characteristics and effective area of the diaphragm spool are theoretically and numerically analyzed. The influencing factors on the effective area of the diaphragm spool are studied by the finite element analysis method. On this basis, a proto-type is produced, and its measurement and control system is built. Experimental results show that the hydraulic amplifier prototype can achieve a stroke range of 540 μm and its amplification ratio is approximately 6.
Study on dynamic stress of pump turbine runner during power failure in pump mode
Authors: Lin Kai , Chen Funan , Wang Chao , Bi Huili , Luo Yongyao , Wang Zhengwei
Published: August 2021

The power failure process of pumped storage unit is one of the most dangerous transient processes. The unit enters the pumping braking mode and then generation mode after power failure. In this process, the rotating speed changes from the negative direction to the positive direction, and the hydraulic torque of the blade also changes rapidly, resulting in the great change of runner stress. In this paper, the amplitude of dynamic stress and the location of stress concentration of runner were calculated and analysed to evaluate the safety of runner in the process of power failure in pump mode. The coupling method of one-dimensional pressure wave calculation and three-dimensional flow simulation is used to predict the change of hydraulic loads and the fluid-structure-interaction method is used to calculate the dynamic characteristics of runner. It is found that the position of stress concentration changes in the process of rapid decrease of rotating speed to zero.
Study on Prediction and Optimization of Furnace Temperature Curve Based on Temperature Change Model
Authors: Ma Heng
Published: August 2021

For the furnace temperature curve when heating electronic components in the reflow furnace, with Fourier’s law, the Newton’s cooling law and the law of conservation of energy as the theoretical basis, combined with the relavant data, and based on heat conduction and thermal convection of the welding area, a temperature change model is established, and single objective optimization model is established as well. By using MATLAB and EXCLE to conduct ergodic search algorithm of solving, the ideal temperature curve and velocity of conveyor belt of the furnace is obtained.
Numerical Simulation of Converter Station Fire: A Study focus on the Fire Hazard of Valve Tower
Authors: Zhang Cheng , Mao Zhiyun , Zhang Bin , Song Quangang , Zhang Jiaqing
Published: August 2021

The fire hazard of a valve tower in converter station fires were investigated by using the Fire Dynamics Simulator (FDS). The 2 m2, 5 m2 and 10 m2 transformer oil pool fires with the calculated heat release rate (HRR) of 2.02, 6.23 and 13.78 MW were considered in the simulations, and the smoke propagation process, smoke temperature and visibility were mainly concerned. The results showed that the whole valve tower was immersed in the fire smoke at about 600 s in 2 m2 fire condition, and the maximum temperature rise inside the valve hall was about 20ºC. In the 5 m2 fire condition, the smoke layer height descended to the bottom of the valve tower at about 300 s, and the visibility around the valve modules was lower than 5 m at about 450 s. The maximum smoke temperature inside the valve hall was over 60ºC, and the temperature of smoke around the valve modules ranged from 43 to 52ºC. In the 10 m2 fire condition, the valve tower was immersed in the fire smoke at about 210 s, and the visibility around the valve modules was lower than 5 m at about 300 s. The smoke temperature beneath the ceiling of the valve hall was over 100ºC, and the temperature at the height of valve towers ranged from 65 to 80ºC. It was observed that the larger the fire size was, the higher the fire hazard of the valve tower would be found. In the 5 m2 and 10 m2 pool fire conditions, the thermal damage to the valve tower was non-negligible. The normal operation of the electrical components in the valve tower might be affected, and the failure of electrical components might be occurred.
Analysis of flow characteristics in pumped storage unit during start-up in turbine mode
Authors: Liu Tao , Wang Chao , Chen Zhiming , Chen Funan , Bi Huili , Luo Yongyao , Wang Zhengwei
Published: August 2021

During the start-up, the unit enters into speed-no-load from static state. The runner is full of complex vortex, which hinders the water flow into the runner, and even leads to the failure of starting up. It is necessary to study the vortex and flow state to evaluate the stability of start-up. In this paper, the coupling method of one-dimensional pipeline system and three-dimensional flow inside the unit is used to simulate the startup process and analyse the three-dimensional flow state in runner. The flow instability during the start-up process is deeply studied by analysing the pressure distribution, streamline and turbulent kinetic energy. The results show that the turbulence intensity in the runner decreases with the increase of discharge. During start-up, the vortices in the runner occupy the whole blade passage, and then disappear. With the decrease of discharge, the turbulent kinetic energy at the runner inlet rises and small vortex appears at runner inlet.
Study on the Aerodynamic Characteristics of Top-Mounted Inlet with Different Lip Angles
Authors: Xiao Lianghua , Ge Changjie , Shang Yinhui
Published: August 2021

The stealthy performance is an important factor to be considered in the design of the modern UAV, and the inlet is the strong RCS scattering source, which needs to be paid more attention. The inlet with lip angle is beneficial to the stealth performance, but unfavorable to the aerodynamic characteristics of the inlet. In this paper, three inlets with different lip angles are studied, and the characteristics of the inlets are obtained by using CFD and experimental methods. Results indicate: 1) data obtained by CFD well predicts the vortex in the inlet, and it’s very close to the experimental value, which shows that CFD method can be used for analysis; 2) the lip angle has a great influence on the characteristics of the inlet under ground running, and the circumferential distortion index of the inlet increases rapidly with the increase of the lip angle; 3) the effects of the lip angle on the characteristics of the inlet can be ignored under the condition of the high incoming Mach number.
Turbulence characteristics of large factory building and its influence on airship transport process
Authors: Liu Yuan , Ye Hu , Zhang Yongdong , Zhang Li , Li Min , Huang Taiqin
Published: August 2021

Aiming at the problem that the stability of airship’s posture is destroyed by turbulent flow when the airship leaves the large factory building, a Computational Fluid Dynamics (CFD) numerical simulation method is used to analyse the characteristics of large factory building disturbance under different inflow angles. The transport process of airship is simulated, and the equivalent force and moment of airship in variation with transport distance are acquired. The results show that the wind field changes along the transport path of the airship, which makes the equivalent force and moment acting on the airship body center fluctuate. In 60 degrees of the incoming flow, compared with other inflow angles, the turbulence at the exit of large factory building is severe, and the distance affected by the turbulent flow of large factory building is shorter, and the equivalent force and moment acting on the airship body center are larger in the process of airship transport. The simulation results provide an effective reference for the safety of airship transport process.
Symmetric and asymmetric bifurcations of natural convection inside circular cavity in the route to chaos
Authors: Chen Jilai , Zhang Jishuo
Published: August 2021

Natural convection occurs when pipe floating at the water surface during night, which can be regarded as a circular cross-section enclosure heated from below and cooled from the top. Numerical investigation is carried out with focuses on the flow configurations in the route to chaos. When Ra is lower than 103, convection is neglectable and conduction dominate the heat transfer. The flow becomes chaos and unsteady when Ra increases to 108. In the route to chaos, the number of cell increase with the decrease of the cell size. It is found that a symmetric to asymmetric bifurcation of flow configuration followed by a asymmetric to symmetric exist for Ra between 103 to 106.
Dynamic characteristics analysis of a hydraulic valve by FEM and CFD method
Authors: Huang Xiaoli , Liu Qian , Wei Qiang , Deng Xiaohe
Published: August 2021

The dynamic characteristic of the flood valve is an important index to ensure its safety and reliability. In this paper, CFD computational fluid dynamics (CFD) method is used to model and simulate the three-dimensional unsteady internal flow field of the valve during its working process, so as to obtain the dynamic distribution of the internal flow field parameters of the valve under specific working conditions. The modal analysis of the valve body is carried out to provide a calculation method and data support for the evaluation of the vibration and noise level during the operation of the valve.
Investigation on Fluid-Structure Interaction of a Steel Truss Aqueduct under Seismic Force
Authors: Chang Haocheng , Wu Zhigang , Zhu Yu , Ma Rujin
Published: August 2021

Aqueduct, one special kind of bridge, has quite different loads from traditional bridge. In this paper, we study the fluid-structure interaction characteristics of a steel truss aqueduct under seismic force using finite element method (FEM). The additive mass method is used to get the acceleration of key sections under E2 earthquake wave. Then the acceleration is applied on the FSI model to obtain the influence of unbalance hydrodynamic load and hydrodynamic pressure on structure. A simplified linear relationship between earthquake acceleration and pressure on the wall is also proposed. The conclusions and approach provided by this study could serve as significant references for anti-seismic design and control of similar steel truss aqueducts.
Research on the influence of the number of holes in porous ventilated plate on the jet length
Authors: Xu Zhenyuan , Ma Wenjing , Yang Kaike , Xiang Yong , Chen Liangming , Zhang Junwei
Published: August 2021

The influence of porous ventilation plate on the smoothing effect of filtered gas is mainly reflected in the jet length after the airflow passes through the porous ventilation plate. The shorter the jet length is, the less the influence of the uniform flow on the subsequent equipment is. In order to solve the problem that different number of openings of porous ventilation plate has different length of jet flow in the downstream, a small size unit module of porous ventilation plate is selected for research, and its geometric shape is reproduced truly. Under the premise of keeping the aperture constant, the opening rate of the porous ventilation plate is indirectly changed by changing the number of openings on the porous ventilation plate, and the influence law of different number of openings on the downstream jet flow is analyzed and studied. In this paper, the incompressible N-S equation and the RNG k-e turbulence model are used to simulate the jet flow field distribution of the porous ventilation plate module. Through simulation calculation, the influence law of different number of openings on the jet length and velocity under the same aperture is obtained. Further, by comparing and analyzing the velocity variation curve in the center area of the porous ventilation plate, the basic research ideas and theoretical basis are provided for the design, selection and research of the opening of the porous ventilation plate, which has a certain reference value to guide the engineering design and application of the porous ventilation plate.
Computation of aerodynamic performance for horizontal axis wind turbine considering the rotation effects
Authors: Liu Guoyan
Published: August 2021

The blade element momentum theory is lack of estimating the wind turbine performance changes caused by rotation. The paper analysis the impact of airfoil flow by centrifugal force and the Coriolis force which generated by the rotating blades and defines the airfoil performance at separated changing flow region by numerical simulation. This paper calculates the aerodynamic performance with centrifugal correction model using a commercial wind turbine as an example, The numerical model and results are verified by comparing with the actual measurement. The results show that the correction model considered the rotation effect to estimate the wind turbine power is more accurate and closer to the measured value.
Numerical Simulation of Turbulent Flow for non-Newtonian Fluid in two kinds Complex Annulus Channel
Authors: Zhang Yi , Li Nan
Published: August 2021

During the polymer flooding multi-layered injection process, it is difficult to achieve large pressure drop and small viscosity loss at the same time in the injection allocators. To address this issue, two kinds of flow channel structures are designed. They are ring groove structure and spindle groove structure. CFD software FLUENT is used to simulate the flow characteristics of non-Newton fluid flowing in the above structures, which are complex annular channels. By comparing the pressure drop, velocity contours and turbulent kinetic energy, the spindle groove structure is preferred. It has large throttle depressurization and big solution viscosity retention rate within a limited length. The influence from different flow channels structure on pressure drop is limited, but the impact on viscosity loss is great.
Study on Passive Acoustic Fuze in Wake Field of Ship with High Precision Recognition for High-Speed Small Target
Authors: He Xiaohui , Liu Zhongle , Yuan Zhiyong , Su Ruiqun
Published: August 2021

It is proposed to adopt a new way against the incoming high-speed small target in the wake field of ship. The passive acoustic fuze composed by a ternary array can detect and receive a large number of signals with characteristic information, among which the intersection process between the incoming target and the acoustic fuze is regarded as the important characteristic information. Through analysis of delay estimation and the delay error according to the characteristics information received from the passive ternary array, such as the distance, the azimuth and the energy envelope, to improve the accuracy of location and azimuth. By means of the modified polynomial least square fitting method to eliminate outliers and interference from signals to improve the sharpness of the curve, to further fit the curve and to eliminate the negative impact from the change of data. An optimal initiation strategy is proposed based on the two above-mentioned aspects. Finally, it proved by tests that the proposed method has a certain value for reference.
Analysis of the influence of the tubes constrained structure of contra-flow vertical shell and tube heat exchanger on heat transfer ability with natural circulation
Authors: Peng Kangwei , Wang Xiaoding , Song Guangdong , Liu Mengmeng
Published: August 2021

In order to verify the effect of the combined restraint form of straight strip and corrugated strip on the heat transfer capacity of shell-tube heat exchanger with natural circulation. The physical model and mathematical model of the local heat exchange section of the heat exchanger are established by using ICEM and Fluent to carry out numerical simulation. The calculation results of three-dimensional flow field and temperature field of the heat exchange section are solved and analysed to obtain the resistance characteristics of the tube bundle of shell-and-tube heat exchanger under the restriction of corrugated strip and straight strip with natural circulation and the influence at the temperature field.
Noise Study of Small Ships during Sailing in Near-wake Field based on Body Force Model
Authors: He Xiaohui , Liu Zhongle , Yuan Zhiyong , Ruan Yingying
Published: August 2021

Noises of ships during sailing and in the near-wake field are both important factors in the ship design, which is of great significance to the ship structure and personnel health. A convenient body force model is adopted to replace the action of a real propeller through the computational fluid dynamics (CFD) method, meanwhile, FW-H equation is used to calculate the radiated noise in the near-wake field of small ships and forecast the noise characteristics of small ships during sailing in the near-wake field. The variation law of noise spectrum at different monitoring points during the evolution of the near-wake field is analyzed, and the simulating results are in good agreement with the testing data. Research proves that the body force model is efficient and feasible to the noise characteristics of small ships during sailing in the near-wake field, which can provide some reference for the design of small ships and also for the noise prediction in the near-wake field.
Controllable Pitch Propeller Performance Comparison of Different Speed and Pitch Matches at non-cavitation condition
Authors: Xi Peng , Meng Lu , Huang Zheng , Wang Zhanzhi
Published: August 2021

The paper took one controllable pitch propeller as study model. Open water performance at different pitches were calculated based on FLUENT. On this basis, rotational speeds that match P/D = 1.5, 1.3, 1.15, 1.0 at 21kn were obtained according to characteristic curve of navigation. Propeller efficiency and pulsing pressure were carried out and compared at different matches. The result shows that pulsating pressure is both influenced by speed and pitch. It is non-linear relationship between pitch ratio and cavitation and efficiency and is inconsistent with the character of propulsion efficiency. Hence it brings adverse effect on pulsing pressure if the match of speed and pitch is selected only according to propulsion efficiency. The paper recommends comprehensive consideration about pulsing pressure and propulsion performance should be taken to choose match of speed and pitch at non-cavitation condition.
Research on the Application of Astrophysics in Magnetohydrodynamics under Big Data
Authors: Ma Chuantao
Published: August 2021

Based on the background of big data, the paper establishes the evolution equation of electromagnetic fluid state parameters over time called Magnetohydrodynamics (MHD). Compared with kinetic theory, magnetohydrodynamics is much simpler in mathematical processing, and there are many processes in plasma. For some other phenomena in plasma, such as Landau damping, instability in velocity space, etc., the theory of magnetohydrodynamics is unable to describe. The thesis starts from the dynamic equations and establishes the magnetohydrodynamic equations.
Application of Celestial Mechanics Theory in Spacecraft Orbit Design
Authors: Gong Yanxiang
Published: August 2021

This paper systematically studies the application of orbital dynamics theory in spacecraft orbit design. In this paper, two linearized equations with J2 relative term perturbation are introduced firstly, and their advantages and disadvantages are compared and analyzed. On this basis, an improved method is proposed and applied to the design of hovering orbit and fast flying orbit, and good results are obtained in some cases. The traditional numerical solution algorithm for ballistic design is innovated and improved, and the improved Newton iterative method is comprehensively applied to ensure that the algorithm can still converge quickly under the condition of inaccurate initial value; The simulation results show that the orbit integrated rapid design method studied in this paper is reliable, fast and accurate, and can be applied to the rapid orbit design of spacecraft.
Numerical Simulation of Multi-puffing Process of Electronic Atomizer
Authors: Wu Jinlu , Huang Jiejie , Gao Yihan , Gao Naiping
Published: August 2021

The thermodynamic behaviors of electronic atomizer during the multi-puffing process have an important influence on the product performances. Exploring the thermodynamic mechanisms behind the vaporization phenomena is helpful for engineers and consumers to understand electronic atomizer. The theoretical modelling and simulation of the multi-puffing process for the electronic atomizer were carried out in this study. During 1∼10 puffing number, the mass fraction of propylene glycol in the residual e-liquid reduced when the puffing number increased. Meanwhile, the mass fraction of vegetable glycerin in the residual e-liquid increased gradually. The total particulate matter of aerosol generated from the electronic atomizer decreased with the puffing number increasing. The maximum vaporization temperatures of the residual e-liquid rose gradually in the multi-puffing process.
Analysis of working characteristics of throttle speed regulating valve
Authors: Han Zhiyin , Zhang Yunxiu , Li Yanfang
Published: August 2021

In this paper, combined with the working requirements of throttling speed regulation in the circuit, the structure principle and working characteristics of speed control valve in flow control valve are analyzed, the speed regulating performance and characteristics of speed regulating valve in hydraulic system are expounded, It is pointed out that the relationship between speed and load of speed regulating valve is rigid in the process of speed regulating of hydraulic system, that is to say, the speed regulating valve is suitable to be used in the case of large load variation, high speed stability requirements of the occasion.
Gas Diffusion Model and Its Application based on CFD Theory
Authors: Zhou Yanbing , Liu Beibei , Tang Qi , Qing Ping , Li Han , Zhang Xiaohong
Published: August 2021

In order to reduce the loss and impact of the unexpected leakage of hazardous chemicals, the paper makes use of the computational fluid mechanics theory and applies the commercial software, FLOVENT, to imitate the steady state and transient state of six scenes of the diffusion scope and concentration change of NH3 and H2 in different wind directions and leak location; furthermore, it takes the simulated result as the basis to analyze the diffusion length and impact scope of the characteristic concentration, both of which will be the evidence for occupants evacuation.
Research on the effect of SS316L electrode plate treatment on HHO gas production performance
Authors: Purwondho Rudy , Sudrajat Ajat , Handoko
Published: August 2021

The working principle of an internal combustion engine, in general, is to convert chemical energy from liquid fuels to mechanical energy. The type of fuel commonly used by internal combustion engines is fossil fuel, which until now has been increasing in use while its supply is running low. The presentstudy is to conduct research in the field of new and renewable energy as an alternative fuel to replace fossil fuels. Hydrogen is a new form of energy carrier that could be obtained through the process of water electrolysis and is a promising fuel supplement in the future. Hydrogen production through the electrolysis process continues to be develop to help use environmentally friendly fuels and can have a positive impact on engine performance and exhaust emissions. However, to produce consistent and quality HHO gas output, the current HHO gas generator still needs tobe improved especially for the production volume. The purpose of this research will be directed to the development of the effective electrode plate system in producing HHO gas. In order to improve the quality and volume of HHO gas production, it was found that the level of surface roughness and the contact angle of the material should be increased through grinding and polishing processes. In this research, various SS316L electrode plates with different surface roughness were made for the analysis of HHO gas production to match the expected volume of HHO gas production. Various conditions of surface roughness of the electrode plate are carrying out by grinding and polishing the surfaces of both sides of the electrode plate to a uniform roughness level.
Analysis on risk management of occupational health and safety on ongoing building project
Authors: Putra A B , Putra B A , Meilani  , Suhendra A , Arumsari P
Published: August 2021

The issue of handling occupational safety and health is an important aspect of construction projects around the world. The purpose of this study is to find the dominant risk aspects that affect occupational safety and health accidents in high rise building projects. This study used a survey method through questionnaire with analytical hierarchy process (AHP) type. Respondents at minimum must have relevant education background in the construction sector and had at least 3 - 4 years of work experience in the construction sector of high-rise building projects in the Greater Jakarta area. Through literature study, there were 3 aspects with its own sub-criteria that was analysed in this research. Those 3 aspects are Technical Aspects (A), Human Resource Aspects (B), and Unexpected Events aspects (C). With technical Aspects (A) has seven sub-criteria, Human Resource Aspects (B) has six sub-criteria, and Unexpected Events aspects (C) has seven sub-criteria. These variables were compiled into an analytical hierarchy process type questionnaire. The survey used an online media, which is the use of Google Drive (Google Sheets), where each respondent filled in the questionnaire in Google Sheets, stored in an online database. The data from the questionnaire were analysed using a program called Expert Choice to determine which aspects have the highest scored and then each aspect was ranked based on the score. Each sub-criteria of the aspects were also analysed and was ranked based on the score. Based on the results of the analysis carried out, the dominant risk aspects that affect work accidents in high rise building construction projects is human resources (Criteria B).
The Framework of Quality Culture Maturity in Indonesian Construction Company to Reduce the Construction Failure Rate
Authors: Pratama Febrian Hera , Andhika Rully , Latief Yusuf
Published: August 2021

A construction company is a business that offers services for construction and/or construction works. In a duration from July 2017 to July 2019, 23 accidents have occurred that are related with infrastructure projects conducted by highly qualified national construction companies that are certified for ISO quality standard, among which are several national strategic projects. These events cause physical and material losses that affect the level of confidence towards the quality of the work results. These events can occur because the application of ISO is not followed by the development of a good quality culture, and there is no ownership of quality culture maturity. For this reason, the objective of this research is then to identify the variables of quality culture maturity in construction companies so that it can be used to measure maturity level of quality culture, and to obtain a strategy to increase the said maturity level quality culture in construction companies, in an effort to reduce the amount of potential construction failures.
System Dynamics Modeling for Petroleum Exploitation Using the ‘Drifting Goals’ Standard Model
Authors: Sardjono Wahyu , Kusnoputranto Haryoto , Budhi Soesilo Tri Edhi , Kristanto A.
Published: August 2021

In an oil drilling area, there are two oil drilling companies that have obtained permits to drill. As time goes by, the availability of existing petroleum decreases. To anticipate natural resources the government only prioritizes one company. Competition occurs between the two of them to explore petroleum from the ground so that they can drill. The purpose of this study is to provide an overview, how to make a system dynamics model related to the problem of oil drilling as an increasingly limited natural resource, by taking the case of the relationship between drilling companies in facing business competition. The method used is system dynamics with a standard model of mutual difficulties (drifting goals). The result obtained is a system dynamics model that can be used to demonstrate the behavior of a simulated petroleum drilling model to get an overview or condition of the limitations of petroleum and future availability.
Ecological Footprint Model of Soekarno-Hatta International Airport from the Perspective of the Local Community
Authors: Sardjono Wahyu , Kusnoputranto Haryoto , Soesilo Tri Edhi Budhi , Gabriel A. Kristanto
Published: August 2021

Soekarno-Hatta International Airport is prone to various environmental problems. The problem of population growth has an impact on increasing economic activity which directly impacts the environment. In every production activity from the environmental side, it will bring up the carrying capacity of the environment and the carrying capacity of the environment or ecological footprint. The problem will be difficult if it turns out that the ecological footprint that occurs exceeds the capacity of the existing environmental carrying capacity, also for airport problems. This will result in the airport being unsustainable. This article will discuss the model of the airport environmental footprint that is currently occurring at Soekarno-Hatta International Airport by utilizing the opinions of respondents who live and have activities around the airport. The factor analysis method is used to process the respondent’s data to obtain the factors that influence the environmental footprint and then through these findings a model can be developed which is expected to be able to abstract the current conditions. The research results show that the dominant environmental footprint at Soekarno-Hatta airport is overload airport activities impact, operational slot time optimization, and renewable of airport energy, which can then be built as an instrument to evaluate, build and develop airport control policies that are environmentally friendly and sustainable.
Owner’s motivation to construct the green buildings in Jakarta, Indonesia
Authors: Ririhena Irish , Sujana Caroline Maretha
Published: August 2021

Green building concept is a concept that design to reduce the effects of global warming. Research needed to know what things that motivate the owner to increase the number of green buildings. The study was conducted by interviewing building owners in Jakarta, Indonesia that had certified as green buildings. The results showed that although the costs required to build a green building was higher than conventional buildings, the owner got a higher sale value of the building and saved the building’s maintenance costs. The level of education and understanding of the owner about the concept of green building was still lacking but did not affect the decision to build green buildings.
Analysis of Strategic Variables for Sustainable Infrastructure and Transportation in Rural Area of Serang Regency, Banten Province
Authors: Wijayanti Y , Anda M , Setyandito O , Suangga M , Juliastuti
Published: August 2021

Infrastructure and transportation are important sector in the realization of Sustainable Development Goals in rural area. The understanding of strategic variables of infrastructure and transportation is very crucial. Therefore, this paper aim to present how we used structural analysis method to identify the sustainability variables of infrastructure and transportation in rural area. Kendayakan village in Serang Regency, a rural area, is studied due to its location as a hinterland to the coastal area of Banten province. The methodology of study is using the Impact Matrix Cross-Reference Multiplication Applied to a Classification (MICMAC) software for analysing the strategic variables. The three pillars of Sustainable Development Goals (SDGs) elements of environmental, economic and social, represented by environmental quality index, income per capita and population density variables, respectively, were included in the analysis. Variables of infrastructure/transportation sustainability analysed were as follows: roads, bridges, water supply, water conservation, drainage and sanitation system, flood management, and housing/building/public facilities. The result shows that bridge infrastructure is classified as key factor which has the highest influence and independent. However, further research should be performed with more variables within the SDGs dimensions of economic, social and environmental.
E-waste for interior accessories: an exploration of material recycling
Authors: Fanthi Reno , Sari Fajarwati Ade Ariyani , Chadijah Siti
Published: August 2021

The development of an electronics-based industry that produces products with power sources as a supporting facility for daily life will not stop. Not only has the product shelf time, electronics are encouraging people to renew their old collection by the time they follow the latest one. This trend has continuously changing lifestyle into consumerism that leads the future of electronic waste. The older electronic products were quickly replaced with the emergence of new model with new design and more complete features. When the time comes, electronic products become obsolete and useless. These obsolete objects are included in the category of electronic waste. Electronic waste is a type of waste that cannot be decomposed by soil and is not renewable. E-waste is a type of recycled waste by reuse it in the form of smaller pieces to produce new product that are completely different from previous products. This research aims to analyse interior accessories design ideas related to local culture as a way to use electronic waste so that it can be used sustainably. Wickering (anyaman) technique is one of the process to recycle will be applied to e-waste by stringing parts of electronic waste materials into local Betawi cultural inspiration as a comprehensive study. The idea is the exploration of electronic waste through the local wisdom of Betawi pattern. This study uses the design thinking method and qualitative methodology on collecting data.
Analyzing important factors in e-commerce for sustainable industry
Authors: Lie Yulius , Purwandari Kartika , Mahesworo Bharuno , Rahutomo Reza , Perbangsa Anzaludin Samsinga , Muljo Hery Harjono , Pardamean Bens
Published: August 2021

The rapid growth of e-commerce for sustainable industry in Indonesia leads to competition for customer acquisition. Instead of gaining loyalty, customers are trapped in a price war and take advantage to compare and choose the one with the best offer. This study aims to analyze important factors of an online retailer to determine customer loyalty in the productive age group. This study contributes to design a questionnaire that can be utilized in analyzing customer loyalty to a retailer in e-commerce (popularly known as the term e-tailer). The questionnaire can be distributed through the Internet to gather demography, population, and e-loyalty factors. Questionnaire design is proposed containing three parts: Part A – Demography, Part B – Targeted Population, and Part C - e-Loyalty Factors. While Part A records basic information and Part B validates, Part C records respondent’s assessment to an e - tailer. Therefore, the outcome delivers a data engineering method to help e-tailers determine important factors to gain customer loyalty.
The impact of ownership and internationalization on sustainable firm performance
Authors: Noerlina  , Tjhin Viany Utami , Mursitama Tirta Nugraha , Simatupang Boto , Bandur Agustinus
Published: August 2021

This study aims to explore the growth of publications by focusing on firm performance through internationalization and the impact of ownership on firm performance, and finally firm performance will ultimately determine the sustainability of the industry. The study was conducted based on data from the Scopus website from 1971 to 2020. Data analysis was performed by grouping and comparing the growth of published articles. After that the analysis continues by looking at the journals that most publish this topic and the quality of the journal. An analysis of the countries of the authors who contributed the most to this research along with the most productive authors was also presented. And the next analysis is to explore the keywords in the research, an analysis is made of the interrelationship of the research that has been done which conducted based on bibliographic coupling technique and present the opportunities for topics that are still rarely examined in this field.