bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical Simulation of Dynamic Process of Variable Flow Gas Generator
Authors: Wei Yansong , Chen Xiong , Feng Wen , Liu Jingyi , Qi Shengju , Yang Guoce 
Published: May 2022

Abstract
In this paper, the research on the flow-adjustable gas generator of the solid rocket ramjet engine is carried out, and the internal flow field of the gas generator during the actuation of the flow control valve is analyzed. The steady and unsteady constant value simulations of the gas generator's working process are carried out respectively, and the static and dynamic flow field distributions in the control valve of the solid jet engine are obtained. The negative regulation in the gas flow adjustment process of the solid-jet engine is reproduced, and the reason for this phenomenon is analyzed based on the simulation results.
Framework Design and Key Technologies of Intelligent Management and Control Platform for Altitude Simulation Test Facility
Authors: Qiao Yanping , Zhao Wanli , Li Kai , Zhang Cong , Guo Yingqing 
Published: May 2022

Abstract
In this paper, based on the technologies such as intelligent operation and maintenance, data mining, etc., a design framework for the intelligent management and control platform of aero-engine altitude simulation test facility was proposed. Aiming at the problems of low data utilization rate of aero-engine altitude simulation test facility and insufficient level of intelligent control of the test process, with the current advanced experience in large-scale equipment management and control, an intelligent management and control platform for altitude simulation test facility can be constructed to effectively ensure the safety of test equipment. Improve test efficiency. The key technologies such as baseline modelling and database construction involved in the platform are summarized in order to realize the intelligent management of altitude simulation test facility, test data, software resources and the coordinated operation of test equipment, and promote the intelligent development of aero-engine altitude simulation test.
A simulation study of fracture toughness for a solid rocket motor contains a cracked propellant grain: Consideration of gas impingement effect
Authors: Wang Tingyu , Xu Jinsheng , Chen Xiong 
Published: May 2022

Abstract
It is essential to understand the fracture characteristics of a cracked propellant grain in a solid rocket motor during the motor ignition. In this paper, a finite element model of a solid rocket motor is developed, including the gas impingement flow field and the structural field. A circumferential crack is prefabricated on a round-hole type propellant grain. The gas pressure inside the cracked grain is obtained as a function of time by calculating the flow field. Then applying this pressure to the structural field, and J-integral at the crack tip can be calculated. The J-integral can represent the fracture toughness of the propellant. The results show that the circumferential crack in the propellant grain opens up as the gas pressure gradually increases. The J-integral values at the crack tip show an oscillating trend and are not monotonically increasing. This paper predicts the moment of crack propagation in the rocket motor grain under gas impingement conditions by comparing the JIC of the propellant.
Research on the statistical damage constitutive model for composite solid propellant
Authors: Li Hui , Song Qi-xuan , Wu Xuan , Xu Jin-sheng , Chen Xiong 
Published: May 2022

Abstract
The study of constitutive model of composite solid propellant is an important basis for analyzing the structural integrity of propellant grains of the solid rocket motor. From the view of microscopic, composite solid propellant is composed of a large number of solid particles with various sizes embedded in the matrix. In this paper, based on the distribution of solid particles with different sizes and the failure strength of the particle-matrix interfaces, the damage evolution was assumed to obey the Weibull distribution function and power law distribution function, and the two statistical damage constitutive models were first established. Then, the model parameters were identified and validated through the uniaxial tensile tests data of HTPB propellant. Finally, the prediction abilities of the developed two models were compared. The results show that both of the two statistical damage models can describe the stress-strain curves of HTPB propellant well.
Research on static characteristics of elastic foil gas thrust bearing applied to aeronautical ACM
Authors: Song Chao , Bian Zhi , Du Jianjun , Ding Shunan , Zhu Jianjun 
Published: May 2022

Abstract
In air conditioning system for aircraft, air cycle machine (ACM) is the flimsy core component, which is impacted observably by the performance and reliability of elastic foil air-dynamic pressure bearing. It's necessary to have research on static characteristics of elastic foil air-dynamic pressure bearing. Based on finite element analysis (FEA) theory, it’s clearly obtained that discretized fluid lubrication Reynolds equation of foil dynamic pressure bearing by the weighted residual method. Coupled with the elastic deformation of foil calculated by beam element model, foil gas film thickness equation is used to work out static characteristics of elastic foil air-dynamic pressure bearing by iterative calculation. And then, it’s known how the basic parameters of the bearing impact its static characteristics. The result of the method in this paper, is verified that it’s correct by the experiment data in other relevant papers, and it’s appropriate to be used as guidance and reference for the further application of elastic foil bearing in ACM.
Research on the Control System of Lathe Open-type Hydrostatic Slide
Authors: Zhang Zhendong , Wang Shengnan , Peng Shanshan 
Published: May 2022

Abstract
In order to make oil film thickness for lathe open-type hydrostatic slide stabilize and without changing following cutting forces, the lathe open-type hydrostatic slide was regarded as the research object. The equations of the control system of the oil film thickness for lathe open-type hydrostatic slide were established, which included the flow equations of slides and the force equations of dynamic slides. The control model of the control system of oil film thickness for lathe open-type hydrostatic slide was established. The parameters of the control model were determined through the identification and optimization, and its state space representation was derived. The PID control of the system was developed. The performance of the control system of oil film thickness had been significantly improved after the PID control. The static and dynamic performance of the system has further improved by conducting pole optimization allocation.
Simulation Analysis of Fault-tolerant Control for Dual Three- Phase Permanent Magnet Synchronous Motor
Authors: Xu Jing , Cui Yebing , Song Bing , Chen Tong , Wang Kai 
Published: May 2022

Abstract
According to the demand of aerospace electromechanical servo system, a new type of fault-tolerant dual three-phase permanent magnet motor(PMSM) and its control system with simple structure, high reliability and high power density are proposed. The dual three-phase PMSM's structure and control model are introduced, the fault-tolerant control algorithm for dual three-phase PMSM is proposed, the simulation model is built and the fault-tolerant control simulation analysis is carried out, Based on the dSPACE control platform, the performance of the synchronous motor prototype is tested, the motor test results show the feasibility of the dual three-phase PMSM and its fault-tolerant control algorithm, which establishes the engineering foundation for the further study of high-reliability electromechanical servo systems.
Study on the Heat Transfer and Ablation Characteristics of the Dual-Pulse Motor during the Working Process of the Barrier
Authors: Renjie SHEN , Yingkun LI , Xiong CHEN 
Published: May 2022

Abstract
In this paper, aiming at the problem of heat transfer and ablation prediction of phenolic resin/nitrile rubber in the insulation material in double pulse motor, based on pyrolysis kinetics and thermochemical ablation theory, a variable heat physical property model of nitrile rubber insulation material with temperature and time was established. A simulation study on the thermal diffusion and pyrolysis ablation of the barrier insulation materials was carried out. The ablation thickness and ablation rate of the barrier insulation material were obtained. The results show that the proposed ablation calculation model has a certain reference value for the ablation research of thermal insulation materials.
Follow me droney! Will UWB technology do it right?
Authors: Hanzel Krzysztof 
Published: May 2022

Abstract
Object tracking for consumer drones is currently a rapidly developing technology. Its implementation is currently carried out with the use of object-in-image detection, which often limits the latest possibilities of this technology. The disadvantage of such a solution is also the increase in energy demand and the need to provide additional computing power, or delays resulting from the transfer of this operation to the control device. The proposed solution to this problem in this article is the use of UWB (Ultra-wideband) technology, which is increasingly appearing in consumer devices. The possible yield related to the accuracy of determining the position of the object as well as the experimentally determined frequency of receiving information about the position was presented. Additional advantages, such as resistance to NLOS (non-line of sight) conditions, were also presented.
Rocker-Bogie Stair Climbing Robot
Authors: Choudhari Anagha , Deshpande Abhay , Tirgure Mayur , Parihar Chiya , Jibhakate Mrunal 
Published: May 2022

Abstract
Robotic technology is now applied in a variety of domains, including hazardous and urban situations, security, planetary systems, rescue missions, and military operations. The current mobility designs are difficult due to the amount of wheels or legs used. They are not designed to withstand the harsh environment of Mars in terms of mechanical breakdown. Four-Wheel rovers can navigate tough terrain thanks to an effective high degree of mobility suspension system. The rocker-bogie design’s most important mechanical feature is its drive train simplicity, which is achieved by having only two motors for motion. Six wheels are used since there are rarely obstacles on natural terrain that require both front wheels of the rover to climb at the same time.
Face Recognition using Nearest Neighbour and Nearest Mean Classification Framework : Empirical Analysis, Conclusions and Future Directions
Authors: Shanmuganathan M. , Nalini T. 
Published: May 2022

Abstract
Human Face recognition algorithms have made huge progress in the last decade. In this manuscript, we have presented an approach for the implementation of a face recognition system in a successful manner by varying pose, scale, lighting, and age variation. The different empirical analysis was performed with various datasets for face detection and face identification. Face identification system detects efficiently segments and recognizes face in a cluttered sequence under varying pose, lighting and age variations. From this experimental analysis morphological model outperformed k-NNC, NMC based closest mean classifier and informative knowledge distillation with fairly reasonable accuracy. Three proposed methods on the basis of an efficient way of handling the face recognition problems. The morphological method outperformed well when compared with k-NNC, NMC based closest mean classifier a proposed method, and another innovative method named Informative knowledge Distillation. The morphological method is suitable for large datasets where occlusion, pose variation, age variations, and different expression of images.
Design of A Low-Cost System for The Monitoring and Control of Public Lighting
Authors: Auccahuasi Wilver , Herrera Lucas , Rojas Karin , Echevarría Martha Romero , Grados Juan , Villavicencio Sergio , Illesca Omar , Calcina Edilberto , Meza Jessica , Cuzcano Abilio , Aviles Martha , Soria Alejandro Paredes , Salazar José Luis Herrera 
Published: May 2022

Abstract
The public lighting poles are part of the public lighting system, so its operation is important and is offered as a welfare mechanism for citizens, it has the disadvantage of the high cost of operation because it is in operation all night for 365 days of the year, in this work a low-cost system is designed to be able to supply power to the public lighting poles, based on a solar panel system and with sensors to be able to measure luminosity, voltages and current, this system sends the information to a base station using the XBEE protocol and viewed using LABVIEW software.
Developing a basis for heavy metal in-situ detection using CZT
Authors: Foley A. , Mohanty S.K. , Sjoden G.E. 
Published: May 2022

Abstract
Heavy metal contamination is a global concern–this type of
contamination in the environment has been on the rise since the
industrial age. Current guidelines from the United States
Environmental Protection Agency and the World Health Organization
limit arsenic concentration in water sources to
10 μg/kg. Typically, detection of heavy metals in industrial
processes include spectrophotometry and colorimetry. A viable
alternative for heavy metal detection can be implemented using a
room temperature gamma spectrometer paired with a portable neutron
generator for in-situ neutron activation analysis. In this paper, we
explore detection of an arsenic salt diluted in a water sample to
specific concentrations; the arsenic sample is utilized to determine
the capability of a 5 mm × 5 mm × 5 mm
CZT detector for heavy metal detection by neutron activation
analysis. Several arsenic dilutions were irradiated in the
University of Utah TRIGA reactor (UUTR), and the samples were
measured on both HPGe and CZT detectors. The direct comparator
method was used to determine the sample mass in a sample
attributed by each detector, and the results were compared to the
known dilution arsenic mass. We determined that a CZT gamma
spectrometer can reliably detect 10 mg/kg arsenic with high
confidence, and as low as 1 mg/kg arsenic with low confidence. For
comparison, an HPGe gamma spectrometer can reliably detect 1 mg/kg
arsenic with high confidence, and as low as 0.1 mg/kg with low
confidence. Based upon our MDA, the CZT spectrometer can detect
samples with a total activity of 1.8×10-5 mCi and higher,
and the HPGe detector can detect an activity of 1.8×10-6
mCi. These results suggest the method has potential in portable
gamma spectrometry solutions for wastewater effluents from
industrial processes such as paint manufacturing, pharmaceutical,
and smelting operations.
Sustainability Assessment of Mosque: A Case Study of Design Proposal in Bandar Bertam Jaya, Penang
Authors: Asyraf Mohd Rodzi Khairul , Zelman Mohamoud Mohamad , Amalina Hanapi Nur 
Published: May 2022

Abstract
Mosque is a significant building typology for Muslims. Careful consideration on location and capacity should be practiced to increasing accessibility and promote comfort to worshippers. Due to high-density residential development, location of the nearest mosque and sense of unity among Muslims in the area, a local community was proposing a new mosque in Bandar Bertam Jaya, Penang to Majlis Agama Islam Negeri Pulau Pinang. A self-sustained mosque with phased development was proposed by Arkitek ICB Sdn. Bhd. With VELUX Daylighting Simulation and basic ventilation principle, the aim of the research is to study the sustainability of the design comprising daylighting and ventilation aspects respectively and how the proposal can give an impact to energy and resource management. The findings including Average Daylight Factor (ADF), opening sizes, wind speed and direction will also be reflected to Malaysian Standard MS 1525 and MS 2680 to value the sustainability aspect performed by the mosque. The findings of the research can be a reference to the architecture firm and the local community on the performance and sustainability of the proposal.
Acceptance on Building Information Modelling (BIM) Training in Selangor Construction Industry: Current Trend and Impediments
Authors: Ang P S E , Wong N Z , Kasim N , Osman M H , Adnan S H , Natasha N S , Ali R 
Published: May 2022

Abstract
Building Information Modelling (BIM) is known as one of the innovations of Information Technology (IT), globally used as a platform to promote collaborative and integrated working environments in the construction project management. The study’s major goals are to determine the existing BIM training trend and to identify impediments to BIM training acceptability in Malaysia’s Selangor construction industry. Out of 90 surveys submitted to G5 to G7 contractors, 60 completed the questionnaire completely, representing a response rate of 67 %. To acquire frequency, percentage, and mean value, the data were analysed using the statistical programme for social science (SPSS) version 26 and Microsoft Excel. These statistics from the current BIM training trend demonstrate that just a small percentage of businesses are using BIM. The majority of the. The majority of businesses lack clear BIM training initiatives. The expensive cost of software and upgrades, deploying processes and technology, and a lack of motivation and support from government and professional bodies are the most significant problems impeding BIM training uptake in the construction sector. This study supports the need for the government to provide more strategic provisions to secure the construction industry’s embrace of BIM training.
Building Information Modelling (BIM) in Malaysian Industrialised Building System (IBS) Construction Projects: Benefits and Challenges
Authors: Ang Soon Ern Peniel , Xian Yang Woo , Kasim Narimah , Hairi Osman Mohamad , Hani Adnan Suraya , Suhada Natasha Nor , Ali Roslinda 
Published: May 2022

Abstract
Building Information Modelling (BIM) is a digital depiction of a developed facility that provides an essential line of ‘integration’ in Industrialised Building System (IBS). BIM, according to the researchers, can help IBS building projects save money and improve budgeting and cost estimating. In the case of the IBS project, BIM has the ability to improve the design process. The building industry in Malaysia, on the other hand, is not progressing as predicted, contributing the least to economic productivity. In relation, BIM adoption would be a key factor of the breakthrough development of construction industry in term of the productivity and efficiency of the project delivery process. Thus, the objectives of this paper is to determine the benefits of using BIM in IBS construction and to identify the challenges of using BIM in IBS building in Malaysia. In Wilayah Persekutuan Kuala Lumpur, a questionnaire survey was given to 93 Grade 7 IBS contractors with BIM experience, 44 of them answered, resulting in a 47.3 percent response rate. Using SPSS software, the data was analysed using frequency analysis and the direct mean approach. According to the findings, the top five benefits of BIM implementation in the IBS industry are visualisation of design, improved cost estimating and budgeting, monitoring and controlling cash flow and cost, installation process, and initial work process, while the top five challenges of implementing BIM in the IBS construction industry in Malaysia are high costs for BIM training, BIM tools and experts, and lack of intellectual property protection. The outcome indicates that implementing BIM in IBS industry benefits the whole project delivery process from design to installation as well as cost performance. However, the financial and legal issues are the main challenges for BIM implementation in IBS industry. Thus, this study is significant in addressing both benefits and challenges of implementing BIM in IBS industry to the stakeholders and provide a perspective to catalyse the development of BIM and IBS construction industry.
An analysis of accidents involving public transport along highway
Authors: Shariff S S R , Nusa F N M , Hanizan H A , Taib M N 
Published: May 2022

Abstract
For years, Malaysia is known as one of the countries that has the highest figure of fatality accident. The staggering number of fatality accidents usually involved private transportation. There are a lot of studies that focus on the causes of the accidents and therefore, a lot of policies and law enforcement have been implemented in order to reduce fatality figure in private transportation. Unfortunately, studies in public transport are not at par with private transportation. Therefore, this study is aimed to analyse the accidents involving public transport specifically, buses along selected Malaysian highway. The analysis starts at describing the potential effects of physical factors namely locations and types of vehicles. Details statistical analysis on the effects of the two factors, locations and types of vehicles on the number of accidents are done. Results show that for the accidents that involve buses in 2018 and 2019, and locations of the accidents have significant association. Hence, this result should help bus drivers to be more alert when driving thru the identified locations.
Performance of Cuplump Modified Binder (CMB) - HMA Containing Sasobit® Wax.
Authors: Mustafa Kamal Mazlina , Ariffin Hadithon Kamarul , Abd Rahim Ruhida 
Published: May 2022

Abstract
Increase in traffic loads combined with an insufficient degree of maintenance in recent years has caused an acceleration and continuous deterioration of the road network globally. Hence, several types of measures may be effective in combatting these matters, such as, improved roadway design, use of better quality of materials and the use of more effective construction methods. The influence of warm mix additive (Sasobit®) on the performance of Natural Rubber Modified Binder based on cuplump was acquired. In this work, the influence of warm mix additive loading on cuplump modified binder (CMB) on softening point, penetration properties Marshall Stability, flow, and Marshall Quotient (Stability to flow ratio) were acquired. The dosage of natural rubber and additive was kept at 5% to 6% and 1% to 2% respectively for all binders. Results showed that the softening point increased while the penetration property decreased to approximately 40% indicating the effect of stiffening due to addition of Sasobit®wax. In addition, Cuplump modified asphalt (CMA) also results in a considerable increase in the Marshall Stability (strength) value and a Marshall Quotient value (resistance to deformation). The MQ increased to 40% compared to a mixture without additive. Thus, it can be said that the additive provides greater resistance against permanent deformations due to their high stability and high Marshall Quotient.
Evaluation of optimum asphalt content and engineering properties of asphalt mixture containing irradiated waste plastic bottles granules as aggregates
Authors: Usman A , Sutanto M H , Napiah M , Zoorob S E , Yaro N S A 
Published: May 2022

Abstract
The massive volume of polyethylene terephthalate waste (WPET) creates serious environmental complications. A popular way to reuse WPET is as aggregates substitute in a densely graded asphalt concrete mixture. However, both positive and negative impacts on Marshall stability were found when PET particles were used as modifiers. One potential means to solve this is the usage of gamma radiation treatment. In this regard, gamma radiation treatment influences on the WPET granules were investigated on modified asphalt mixtures volumetric and strength properties. The findings illustrate that the application of treatment with gamma rays on WPET granules enhances stability, decreases optimum asphalt content (OAC), boosts rigidity, and the modified asphalt mixture meets all the Marshall mix design requirements. Therefore, the proposed modification of the waste plastic bottles granules by exposing to gamma radiation might be an efficient avenue for repurposing waste with improve engineering properties.