bluuebunny/crossref_metadata_2025 huggingface dataset:
The performance of growth and yield component of soybean varieties in Margodadi village, Ambarawa sub-district, Pringsewu regency, Lampung province, Indonesia
Authors: Mustikawati D R , Endriani
Published: May 2020

Efforts to increase soybean production require superior varieties which are stable in every agroecology production center. Therefore, it is necessary to perform field evaluation of several new released soybean varieties. The aim of this study was to evaluate the growth and yield potential of soybean varieties developed by Indonesian Legume and Tuber Crops Research Institute (ILETRI) Malang in a field experiment. Four soybean varieties (Devon 1, Dering 1, Gema and Gepak Kuning) were sown in Margodadi Village, Ambarawa Sub-district, Pringsewu Regency, Lampung Province, Indonesia from May to August 2017. Plots were arranged in randomized complete block design with six replicates. The variables observed were crop emergence at 7 DAS sowing, plant height and number of pods at harvest, pest attack on 1-month-old plants and at harvest, and seed yield. The results showed that Gepak Kuning gave the highest yield (2.13 t/ha), which indicated that this variety is suitable to be planted and developed in the location of the study.
Inventory and morphological characterization of local upland rice in the highlands of South Sumatra province
Authors: Sasmita P , Kodir K A
Published: May 2020

South Sumatra has various types of local rice in various agroecosystems that have the potential as plant genetic resources (PGR) of food crops. At present, the existence of the PGR has been diminished due to genetic erosion. Inventory and characterization of local rice genetic resources were carried out in the highlands of South Sumatra during 2014–2017. The study was conducted in Muara Enim, Ogan Komering Ulu, Pagar Alam, and Lahat Regencies. The objective of the study was to inventory and characterize the PGR. The method used was exploration and desk study. Purposive sampling was applied. Morpho-agronomic characterization was carried out in situ and ex situ. Morphological observations were carried out by visually observing the parts of leaves, stems, panicles and unhulled seeds of the rice accessionsin the location. Morphological characteristics were analyzed descriptively by tabulation. Inventory result showed 17 varieties of local upland rice were spread across four regencies. Local upland rice varieties originating from the regencies with different biophysical characteristics showed differences in morphological characteristics. Among the 17 local varieties, 3 varieties were characterized, namely Setangkai, Barokah and Ayek Keruh. Morpho-agronomic characterization results showed that there was a high diversity of rice accessions collected from different locations in South Sumatra.
Characterization of 337 exon-based single nucleotide polymorphisms (SNPs) unique to the Indonesian soybean varieties
Authors: Tasma I M , Satyawan D , Rijzaani H
Published: May 2020

Genome resequencing of five Indonesian soybean varieties resulted in a total of 2,597,286 single nucleotide polymorphisms (SNPs), 257,598 insertions, and 202,157 deletions. Out of those SNPs, only 95,207 (2.15%) were located in the protein-coding region (exon). The objective of this study was to characterize 337 exon-based SNPs unique to the Indonesian soybean varieties. The study was conducted by taking SNP samples located in the exons using criteria of gene fragments containing the SNPs that were sequenced at least five times within each of the soybean varieties. Out of 95,154 gene-based SNPs detected, only 337 SNPs met the criteria. Each of the soybean varieties was genotyped with the 337 SNP loci, and the genotypic data were scored and analyzed. Results showed that 59 SNPs were common to all five soybean genotypes. A total of 43, 41, 25, 32 and 28 SNPs loci were unique to soybean genotype Davros, Grobogan, Malabar, Tambora and B3293, respectively. These unique SNPs can function as DNA fingerprints for each variety. Out of 59 common SNPs, 24 SNPs were mutations that change the amino acid sequence of the encoded proteins. These genes with amino acid change may have high economic values such as those controlling soybean adaptation in tropical climate, photoperiod insensitivity, disease and insect resistance genes. Expression analyses of the genes with amino acid change showed variation in the expression pattern across different soybean tissues. Functional genomic analysis is necessary to isolate genes useful for breeding purposes.
Utilization of trichoderma sp. and pseudomonas fluorescens as biofertilizer in shade-resistant soybean
Authors: Miftahurrohmat A , Sutarman
Published: May 2020

This study aims to obtain Trichoderma fungi and Pseudomonas fluorescens bacteria obtained from soybean planting fields and test their ability as biofertilizer agents to assist soybean growth until the end of the vegetative phase. From the soybean crop field, Trichoderma fungi and P. fluorescens (Pf) were isolated. After purification, observations were made to determine morphological physical characteristics both macroscopically and microscopically. Pf bacterial isolates were tested for their performance characteristics to ensure that bacteria were not pathogenic. For work power testing, as a biofertilizer agent, a factorial experiment was prepared in a completely randomized design (CRD). As the first factor, Trichoderma consists of without and with Trichoderma, while the second factor is Pf bacteria consisting of without and with Pf. The experiment was repeated four times so that 16 experimental units were obtained. The variables observed were plant height, number of leaves, stem diameter, and time of initial average flower appearance. Data were analyzed by ANOVA followed by HSD testing on a 5% test tarf. The results showed that the fungi Trichoderma sp. obtained by having single-celled, smooth-walled conidia measuring 3.2 x 2.0 µm, green with irregular upright hyaline conidiophores. As for P. fluorensence does not cause foul symptoms in test potatoes which are non-pathogenic. Fungi Trichoderma sp. TC-Jro-02 isolates and Pseudomonas fluorescens bacteria which were applied as biofertilizer agents were each increasing and inhibiting growth in plant height, leaf number, stover dry weight, and dry weight of soybean root of Dena varieties grown in shade up to 30 days after planting. Interactions between them affect the dry weight of stover and the dry weight of plant roots. The bacterial activity of Pseudomonas fluorescens inhibits the effect of the performance of Trichoderma fungi in supporting the growth of soybean plants in the shade.
Transformation of function, form, zoning, circulation and material of Rumoh Aceh “Study of Aceh traditional architecture in Montasik sub-district, Aceh Besar”
Authors: Azzahra F , Sahriyadi
Published: May 2020

Along with the time running, traditional architecture starts to be limited by time. While traditional architecture is a self-identity of a region. The location of research is Province of Aceh, namely in Sub-district of Montasik, District of Aceh Besar. The objects of study are traditional house buildings called as Rumoh Aceh. Because, principally, all buildings have similarity; thus, samples were taken randomly from each village. The formulation of questions is to identify transformation of function, form, zoning, circulation and materials of Rumoh Aceh found in the Sub-district of Montasik. The objectives of this study are to understand transformation occurring in Rumoh Aceh in the Sub-district of Montasik over time in order to know causal factors; moreover, it is expected to be reference to the Rumoh Aceh itself. This study used descriptive-qualitative method to adopt phenomena directly (what, who, and where the research location is). This method can interpret and associate data, important situation, attitude, point of view, conflict, and others. Because this study is direct, the techniques of observation and survey (primary data) keep to be choice, such as, interview and documentation. Relevant references to data can be analyzed and developed (secondary data). The results of study indicate that Rumoh Aceh found in Sub-district of Montasik, in terms of functional transformation, is still ideal, but there are changes in function in lower parts of building, that previously functioned as animal breeding area, rice storage and rest area, now it changes into permanent space functioning as room, storage area, bathroom, and cloth drying area. Moreover, we seldom find terrace and gate areas in front of building. While form transformation in Rumoh Aceh tend to be unchanged. Rectangular and triangular form keep to be choice. Transformation of zoning and circulation only occur in lower parts of building because there are additional rooms and functional change of rooms so that automatically circulation system also changes according to needs. Along with time running, transformations of building materials are found in roofs. Before, Rumoh Aceh used local materials, such as, rumbiah leaf plait; now, iron sheets dominate the Rumoh Aceh. Moreover, use of brick materials is widely found in lower parts of building. Current materials, such as, plywood and acrylic, are found in nearly each Rumoh Aceh, especially in door and window blades.
Preparation of suppressor column for capillary ion chromatography with conductivity detection
Authors: Rahayu A , Fajri J A , Lim L W , Takeuchi T
Published: May 2020

A capillary suppressor column was prepared by packed column and monolith columns. The packed column prepared using HyperSep SCX as packing material. The sulfonate group was introduced from benzenesulfunic acid that could be used as a suppressor material. The slurry of packing material was packed to capillary fused silica 0.53 mm I.D x 0.66 mm O.D with 30 mm of length. Monolith suppressor column was prepared from methacrylate based modified with Na2SO3 for strong cation exchanger and iminodiacetic acid for weak cation exchanger. A suppressor column was connected to a capillary chromatography system for separating 5 inorganic anions (Cl−, NO2
−, Br−, NO3
− and SO4
2-) using conductivity detection. The suppression system could reduce the background conductivity of the mobile phase sodium bicarbonate and sodium carbonate properly up to 67.72% using packed suppressor column with size 0.53 mm I.D x 0.66 mm O.D with 30 mm length. It column could be used about 1.5 hours before breakthrough.
Biomass Gasification of Sengon Sawdust to Produce Gas Fuel
Authors: Maryudi  , Aktawan A , Sunardi  , Indarsi K , Handayani E S
Published: May 2020

Indonesia is a country with extensive agricultural and plantation areas that produce abundant biomass, some of which are rice husks, coconut shells, corn cobs, and wood waste. Wood waste itself has a very large number of species, for example, Sengon sawdust, Teakwood, Mahogany wood, Lamtoro wood and so on. Sengon wood is usually used as material for craftsmen and furniture, but with advanced technology, it can be done using sengon sawdust to produce syngas with the gasification process. The gasification process uses a gasifier tool. In this study, an independent variable was used in the form of sengon sawdust. While the dependent variable that will be obtained is in the form of syngas output, gasification temperature and time needed to produce syngas. The results showed that the more bait sengon sawdust, the more syngas was produced and the longer the time needed. Based on syngas analysis, CO results were obtained 17.235%; CH4 3.446%; H2 5.089%. It can be concluded that sengon wood powder waste is one of the biomass that can be used as a gasification raw material to meet energy needs.
Biodiesel from microalgae Nannochloropsis oculata and Tetraselmis chuii by sonication technique and K2CO3 catalyst
Authors: Purnama H , Harland  , Hidayati N
Published: May 2020

The way out of the energy crisis is to divert national energy needs with the use of new and renewable energy. Bioenergy such as biodiesel is the expected one of those. Algae which has the potential to be used as raw material for making biodiesel is microalgae because it is easier in its cultivation. The microalgae used in this study were Nannochloropsis oculata and Tetraselmis chuii. Microalgae that have been harvested in the pasta form are extracted to obtain the oil then processed into biodiesel with an ultrasonic device. The transesterification reaction ran at 65oC with a 1% K2CO3 catalyst. The variables applied were the ratio of oil: methanol (1:5; 1:10; 1:15) and reaction time (1 and 3 hours). The biodiesel produced was then tested for acid numbers, %FFA, density, viscosity, and GC-MS analysis. The amount of N. oculata and T. chuii obtained from harvesting was 591.75 and 460.11 grams, respectively. The yield of oil extracted from N. oculata and T. chuii was 46.47% and 39.31%. Biodiesel yield obtained from N. oculata between 72.19-74.33% with the highest yield for N3 sample, meanwhile in T. chuii between 69-72.95% with the highest gain for T3 sample. In general, biodiesel samples meet national standard SNI for Biodiesel in density, viscosity and acid number. The methyl ester content of the GC-MS test in the best biodiesel samples is N1 sample at 68.4% and T6 sample at 79.49%.
Financial feasibility study of batching plant investment on Sigli -Banda Aceh highway construction project
Authors: Rani H A , Bonenehu R S , Mubarak M H
Published: May 2020

The construction of the Sigli - Banda Aceh highway project as long as 74 km stretches across two Regencies namely Pidie and Aceh Besar, generating the large demand for ready mix concrete. It is required the investors in providing ready mix concrete service and wishing adequate mutual exchange from each capital invested. The problem in this study is to investigate how the feasibility and business opportunity of a batching plant investment from its financial aspects. This study aims to determine the financial feasibility and business opportunities on batching plant investment of ready mix concrete at Sigli - Banda Aceh highway project. In this research data was collected and processed to obtain cash flow and Depreciation. The method used to determine the financial feasibility is by obtaining its investment valuation analysis from data processing. Those are Net Present Value (NPV), Annual Equivalent (AE), Internal Rate of Return (IRR), Benefit-cost ratio (BCR) and Payback Period (PBP). From the calculation, it is obtained that the profit obtained from NPV is IDR 12,145,111,515.27, the profit obtained from AE is IDR 3,818,104,138.07, IRR is above 40%, BCR is > 1 as 1,10, PBP is IDR 15,104,717,354.22 in the second year or equal to the investment period. It can be concluded that batching plant investment on Sigli - Banda Aceh highway construction project is feasible to be constructed and become a business opportunity for the investors.
Laterite Soil Behavior - Geotextile (Study of Laterite Soil, Tanah Laut District)
Authors: Setiawan I , Muzaidi I , Fitriansyah M
Published: May 2020

Land has different specifications and characters from each type. The land has the main function is as a support of a building construction be it buildings, roads, etc. Seeing from the function is inseparable from the mechanical properties of the soil such as cohesion (c) and soil shear angle (¢) where the higher the carrying capacity of the soil the better. The contact force (interface) between the soil surface and the surface of the soil reinforcement material is very dependent on the type of soil. Soil-geotextile contact will influence the carrying capacity of the soil, especially shear strength and soil cohesion. At present research on contact style interface (5) of laterite-geotextile soil. The method used in this research is to use laboratory-scale experimental methods. This research was conducted with the condition of the soil sample not submerged in water (unsaturated). The test results may be known laterite in Tanah Laut has value ratio 5/|) of 0.89 for the type of woven geotextile (HRX250), while the value of the ratio 5/(|) of 0.86 for the type of nonwoven geotextile (TS600).
Laboratory study: durability characteristics of Asphalt concrete binder course utilizing Bantak and Clereng as aggregate and Asbuton Lawele as fine aggregate (using Marshall Methods)
Authors: Ruhaidani E , Hardiani D P , Anggarini E , Perdana Y
Published: May 2020

Construction of roads and will continue and growing, while on the other side of the raw material reserves for the road less. Given this, the researchers tried to use the mining waste material at the bottom of Sabo Dam from Merapi which is bantak to substituted coarse aggregate and asbuton is substituted fine aggregate to tackle the lack of asphalt and to utilise local’s natural resources. This research carried out by using a mixture of 40% Bantak and 60% Clereng and substitute fine aggregate (substitution) with asbuton Lawele type 20/25 with the same amount. The asbuton concentrate variation that used in the test are (100%:0), (75%:25%), (50%:50%), (25%:75%), (0%:100%). All the specimens tested and analysed using Marshall Method as Public Work Department specification (2007), determined the optimum asphalt value of each specimen. All specimens with optimum value will immersed in water during half hour, 24 hours and 48 hours before Marshall test. Result of the test is used to know the asbuton substitution variation effects based on stability value, and residual strength index. The result shows that optimum asphalt value of asbuton specimens with percentage asbuton 0%, 25%, 50%, 75% and 100% are 6.2%; 5.6%; 5.25%; 5.1% and 5%. On standardise immersion asbuton variation of 0%, 25%, 50%, 75% and 100% the mix stability value are of 1498 kg, 1629 kg, 1405 kg, 1264 kg and 1258 kg respectively. While on 48 hour immersion, the residual strength indexs are 97.97%, 88.86%; 71.06%; 64.41% and 57%. In the conclusion optimum utilisation asbuton is 25% with optimum asphalt value 56% because has high stability, but has low durability.
Feasibility test on the performance of LoRa technology incorporated in the wireless sensor network
Authors: Astutik R P , Winarno H A
Published: May 2020

Wireless Sensor Network (WSN) and Internet of Things (IoT) technologies are developed rapidly in many implementations such as smart cities, smart offices, and smart transportations. They are closely related to communication technology which requires efficient power and covered long distance. To overcome these two problems, this paper proposes the design of a communication system for WSN using LoRa technology that has the ability to receiving lower power and wider area coverage. In this research, the implementation of this communication design is just a prototype that contains two nodes that communicate with each other by using LoRa technology as a communication system. The experiment which was based on measurement had the maximum distance of a point to point communication that reached about 200 m while the lowest received power was accounted at -98 dB. The use of the best spreading factor based on simulation was recorded at 7 using a bandwidth of 250 kbps and 10 using a bandwidth of 125 kbps. Showing the result, it can be concluded that 200 m was the longest distance which can be achieved by this prototype and this was useful for a small system.
Water content analysis effect on dielectric breakdown voltage in 500 kv transformer oil using coefficient correlation method
Authors: Auliq M A , Nugroho A B
Published: May 2020

Transformer is a vital component in distributing electrical power. The use of transformer oil which is continuously for a long time and not monitored can cause fatal damage to the transformer. This condition triggered by high water content in the transformer oil which causes breakdown voltage failure and electrical short circuit on the transformer. Therefore this study aims to analyze the influence of water content and breakdown voltage on 500 kV transformer oil type Kunlun Ki25x using the coefficient correlation method. The coefficient correlation method is statistical analysis technique used to look for relationships between variables that are quantitative. Two variables are said to be correlated if the changes in one variable will be followed by changes in the other variables regularly in the same direction (positive correlation) or opposite direction (negative correlation). For material testing and analysis data researcher using Megger OTS100AF instrument. This experiment conduct in paiton 9 power plant East Java for 36 month. Based on experimental data result researcher obtained a strong negative correlation value on the relationship of water content and breakdown voltage with the coefficient R = -0.88 on the function y = 0.7692x + 85.733 and it has characteristic that the increase in water content (x) is inversely proportional to increase the dielectric breakdown voltage (y). In addition, it is also known that the increase in transformer oil temperature is directly proportional to the increase in water content with a positive correlation of R = 0.92 at the function y = 0.4208x + 50.155. From the results above, it can be concluded that the parameters of water content and temperature have an impact on the value of the breakdown voltage and the performance of the transformer
Harmonisa in defibrillator equipment (DC Shock)using simulink Matlab
Authors: Harahap P , Oktrialdi B
Published: May 2020

The quality of electric power is a combination of voltage quality and current quality. Voltage disturbances often occur from the electricity network which can affect end users. Whereas, current interruption originates from end users which will affect the network. Electrical power quality problems in hospitals often occur due to non-linear loads, harmonic injection, and interaction between medical devices. Because the electrical power quality problem is cumulative, the detected minor event must be taken seriously. The nonlinear load distorts the current waveform and creates a harmonic current to the current system. The nonlinear load distorts the current waveform and creates a harmonic current to the current system. After the simulation, it can be concluded that DC Shock/Defibrillator equipment has Total Harmonic Current Distortion (THDi) equal to 76.1% and Total Harmonic Voltage (THDv) 3.5% with 330Watt power.
Stator slotted design of axial flux permanent magnet generator for low-speed turbine
Authors: Irfan M , Ariyanto R F , Syafaah L , Faruq A , Nurhadi  , Subeki N
Published: May 2020

The wind power plant has an important component, namely a generator which is an electrical engine that converts mechanical energy into electrical energy. This paper discusses the design of the permanent rotor axial flux generator (Single Rotor Single Stator) using a slotted stator and using a slotted stator reference design. To find out more in detail, this work was conducted by comparing four different generator designs, the number of slots and tooth widths. Testing the width of the teeth and the number of slots varied, including 12 slots width of teeth 23 mm, 15 slots width of teeth 18 mm, and 18 slots width of teeth 15 mm. The permanent magnet used in this study is neodymium iron boron, NdFeB 48/11 with a total of 10 poles. The desired reference power is 100 Watt with a speed of 500 Rpm. The outputs of each design in the form of voltage, current, power, and efficiency are discussed. The conclusion obtained that the additional teeth to the stator and increasing the number of axial flux slots affect the specified output parameters. The result of using teeth is that the voltage, current, and power are getting bigger and the more number of slots the smaller the voltage, current, and power.
The comparison of ergonomic risk assessment results using job strain index and OCRA methods
Authors: Restuputri D P , Masudin I , Putri A R C
Published: May 2020

Musculoskeletal Disorder (MDSs) is a real problem in terms of ergonomics. MSD is a muscle/pain disorder which is frequently undergone by operators after doing work, e.g. in the press line of a printing company. Some activities in press line are lifting books, reaching out the engine levers, and turning the engine levers. Many MSDs are undergone by operators, such as aches in the upper arms, hands, feet, and back. This is caused by excessive burdens and wrong posture when doing work. This study is aimed to compare the assessment results of operators’ body posture by using OCRA and JSI methods. OCRA (Occupational Repetitive Action) Index is a method used to evaluate and analyze a job. Meanwhile, Job Strain Index (JSI) is a method used to estimate the risk of pain in the upper body. Evaluation is carried out on repetitive activities. Based on the calculation results, the OCRA values obtained are 3.35 for the right hand and 1.13 for the left hand. Meanwhile, JSI value for the right hand is 9 and the left hand is 4.5. The results of the assessment indicate that these activities are categorized as high-risk so and need to be corrected. The author’s recommendation is by adding the number of operators on the press line.
Predictions of new students interest in entering the XXX University with statistic modeling
Authors: Priyana E D
Published: May 2020

Abstract. XXX is the establishment of one of Muhammadiyah’s charitable businesses in the field of education. From the beginning of its formation on May 25, 1980 until now XXX has been able to open 18 study programs plus other study programs at the Faculty of Health and the Faculty of Engineering which are planned to be opened. The addition of the study program is expected to filter the number of new student interests to become XXX residents. But unfortunately, the many universities in Gresik were opened, making XXX have to work extra in attracting new students. This research will only be focused on single forecasting on the number of new student interests in several study programs and one university. In the descriptive statistical results, it was obtained the results that Management Study Program contributed the most interest in entering students and as Study Programs which were not new, Fisheries Cultivation Study Program contributed the least interest of students entering. The results of cluster analysis were formed by 8 groups. Group 5 consisting of Management Study Program, Industrial Engineering and PGSD contributed the most interest in terms of the average count per study program. Forecast with Moving Average also proves that this group has a tendency to rise. ARIMA results (1 0 0) for one University produces a value that falls smoothly with a less significant value, but if left unchecked it can also harm the campus.
Consumable Fish Classification Using k-Nearest Neighbor
Authors: Winiarti S , Indikawati F I , Oktaviana A , Yuliansyah H
Published: May 2020

Fish is beneficial for the human body because it has high protein content. Consuming fish is necessary and expert knowledge is needed to identify fresh fish that are suitable for consumption. In this study, we developed a classification system to identify four classes of consumable fish by grouping fish images based on texture extraction and color features. We use fish meat and fish scale as identification parameters. Fish meat image is measured using the HSV colors model (Hue, Saturation, and Value) and GLCM (Gray Level Co-occurrence Matrix) method. We use these values for texture feature extraction of scales. Then we use k-Nearest Neighbor (kNN) as the classifier. The test results from 320 sample images show that the identification accuracy of tilapia meat is 90% and 97.5% for mackerel meat. Meanwhile for the scales, the accuracy up to 87.5% for tilapia scales and 95% for mackerel scales.
Workability of coconut fiber concrete with rice husk ash as a sand replacement
Authors: Riza F V , Karnelia D , Hadipramana J
Published: May 2020

Fiber concrete has been widely known for its ability to prevent cracks especially micro crack. Natural fiber concrete was one way to accommodate the use of waste natural fibers and at the same time producing sustainable materials. This research tried to examine the workability of Coconut Fiber Concrete (CFC) that incorporated 2% of Coconut Fiber (CF) with Rice Husk Ash (RHA) as a sand replacement with ratio 10, 20 and 30% respectively. Three types of water-cement ratios were used 0.38, 0.41 and 0.44. The result showed that slump value ranging from 3.5 cm and 4 cm. The addition of 20% of RHA resulted in the steady slump value for all water-cement ratio. The CFC is on the same par compare to the steel fiber concrete which incorporated 1.28% fiber.
Workspace Analysis and Dynamics Simulation of Manipulator based on MATLAB
Authors: Guoxian Niu , Liang Li
Published: May 2020

Workspace analysis and joint moment calculation are the main contents of manipulator’s design and calculation. According to the joint layout characteristics of the light cooperative manipulator, the workspace of the manipulator is divided into two parts: the arm workspace and the wrist workspace. The geometric method and Monte Carlo method are used to calculate the workspace of the manipulator and to guide the determination of the structural parameters of the manipulator. Based on Simulink/Simmechanics library, the dynamics model of six-axis serial manipulator is built and the joint rotational moment is calculated. The simulation results are in good agreement with the results of Newton Euler method. The simulation model can be used to replace Newton Euler method in the design process of the manipulator to improve the design efficiency.
The Aero-elastic-wake Coupling Behavior for a Two-wind-turbines Case with Power Control Process
Authors: Ma Zhe , Lei LiPing , Zeng Pan
Published: May 2020

This study focuses on the aero-elastic-wake coupling behavior of wind turbines. A newly developed code called FALM (Flexible Actuator Line Model), which combines the wake simulation ability of the actuator line mothed (ALM) and the structural simulation ability of the flexible multibody dynamics method, was employed to achieve these simulations. The power output and thrust, the natural frequency and deformation and the wake characteristics of a single NREL 5MW wind turbine were studied to validate this code. It shows that nonlinear effects such as spin softening and stress stiffening were fully considered by FALM and it can also guarantee a reliable prediction of power and thrust of wind turbines. Furthermore, a case of two-wind-turbines with the inlet wind speed of 14m/s (exceeding the rated wind speed) were carried out to study the aero-elastic-wake coupling behavior in a wind farm. It shows that FALM is able to simulate multiple wind turbines with power control system involved. The pitch control process of the upstream wind turbine was predicted and the dynamic loads of the downstream wind turbine caused by the wake effect were studied. These results will contribute to the study of reducing the fatigue load caused by wake effect.
Research on Automatic Manual Transmission of Pure Electric Vehicle
Authors: Niu Qinyu , Men Hao , Yang Rong
Published: May 2020

In recent years, the electric vehicle industry has developed rapidly. Compared with traditional internal combustion engine vehicles, pure electric vehicles have the advantages of less pollution, less noise, and simple structure. At the same time, the problem of short range has become an important factor restricting the development of pure electric vehicles. This paper proposes to mount a four-speed mechanical automatic transmission in a pure electric vehicle to improve the working efficiency of the motor, thereby improving the vehicle’s cruising range. CRUISE simulation software was used to build a vehicle model of a pure electric vehicle equipped with this transmission. A vehicle equipped with a fixed gear ratio reducer is used as a comparative experiment to study the impact of a mechanical automatic transmission on the economy and power of the vehicle.
Method to Integrate Human Simulation into Gazebo for Human-robot Collaboration
Authors: He Linxi , Glogowski Paul , Lemmerz Kai , Kuhlenkötter Bernd , Zhang Weimin
Published: May 2020

The human-robot collaboration (HRC) takes the advantages of both the flexibility of human workers and the accuracy of robots. Simulation is an effective and economical method to verify the safety and reliability of the HRC system. This paper presents an approach to integrate the simulation of human workers into a robot simulation environment. A digital human model is built in the robot simulator Gazebo and can be controlled by data from proprietary software for human workflow planning. As a result, a holistic HRC scenario is established in Gazebo, which provides the potential for workspace monitoring and robot collision-free trajectory planning based on the Robot Operating System (ROS).
A Novel Comprehensive Model of Wet Clutch During the Engagement Process
Authors: Peng Baoshan , Li Heyan , Liu Jikai
Published: May 2020

With the development of vehicles towards higher power density and reliability, the wet clutch, which is the critical component in transmission system, always encounters the problems of ablation, wear, and breakage. To solve this problem, a novel comprehensive model is developed for the wet clutch to reveal its intrinsic working mechanism. Firstly, a dynamic clearance varying model and a torque balance model are developed for the wet clutch to explain the bearing mechanism along the axial and circumferential directions. After that, the friction coefficient, which varies depending on the interface pressure, slipping speed and temperature, is obtained. By developing the temperature prediction model, a theoretical coupling model is finally established for the engagement process of wet clutch. From the simulation results, the coupling model is sufficient to describe the changing trend of several critical parameters, including the viscous torque, the asperity torque, the contact status on the friction interface, the temperature rise and the friction coefficient, etc.
Analysis of the Vacuum Chamber Based on the Environmental Simulation Experiment of the Lunar Surface
Authors: Zhang Yi , He Chao , Zhang Lei , Han Xiao , Li Qiang , Gu Zhifei , Zhang Pengsong
Published: May 2020

The vacuum chamber based on the environmental simulation experiment of the lunar surface mainly provides the simulation space for the comprehensive environmental effect tests such as vacuum, low temperature, irradiation and charged dust, and provides the interface for the relevant environmental sources, in-situ testing instruments, etc. In this paper, a set of vacuum chamber for the experiment is provided, and the finite element analysis, surface temperature analysis and radiation dose analysis of the chamber are carried out. The analysis results provide a guarantee for the experiment and a reference for the related research work.
Influence of the Clearance of the Transmission Mechanism of the Transmission Characteristics
Authors: XU Jian , FAN Siyi
Published: May 2020

The transmission mechanism is composed of a bearing cover, a rocker arm cover, a rocker arm, a shaft sleeve, a sleeve, a bushing, and a bearing. For a small space and weak rigidity servo drive mechanism, its clearance has a greater impact on static servo characteristics such as swing angle response and loop width. In this paper, the clearance of the transmission mechanism and the play clearance of the bearing are analysed, and the influence on the servo characteristics is obtained.
Immersive Virtual Reality for Fire Safety Behavioural Skills Training via Gesture-based Technology
Authors: Fu Yaqin , Li Qi
Published: May 2020

The fire safety can be one of the biggest problems in metropolitan area. To reduce injuries in a fire, the virtual reality based behavioural skills training (BST) has been used to train people to survive in emergency circumstance. VR-based BST training has been demonstrated to effectively help people of different ages to acquire safe escape skills in a virtual environment. However, most of people have encountered difficulty to train in a right gesture or poor body performance, such as running at unsuitable body position. Gesture-based technology can effectively help people to learn the correct gestures in order to enhance training efficiency. Thus, this paper proposes a theoretical framework of “VR-Gesture BST”, which is expected to improve behavioural skills training more effectively for fire safety training. It adopts motion capture device obtaining user’s body data to evaluate the body performance during the BST training. The outcomes of the study provide guideline and suggestions for VR based design in practice of the behavioural skills training adopted gesture-based technology.
Study on Vibration Characteristics of Cantilever Plate with Annular Mass Frame
Authors: Chen Li Hua , Hou Chao Ran , Cui Shou Jie , Shan Lu Tong , Yang Feng Hong
Published: May 2020

The principle of piezoelectric energy harvester is to convert vibration energy into electric energy, which can supply power for other electronic devices. The actual environment vibration is broadband, random and multi-directional, and the working frequency band of piezoelectric energy harvester needs to be increased, so as to raise energy capture efficiency. In order to increase the numbers of resonance frequencies and widen working band, a new type of cantilever plate structure with ring mass frame is designed. This structure is composed of two anti-symmetrically placed cantilever plates with variable cross-section and additional annular mass. Firstly, the natural frequencies and mode shapes of the system are obtained by modal analysis using the finite element method. Based on modal diagrams, the bending and torsional of cantilever plate and the motion of rigid ring mass frame are considered comprehensively, then the theoretical modal functions of the structure are given. Furthermore, the natural frequencies of the structure are obtained by Rayleigh method. Natural frequencies and theoretical modal functions are verified by comparing with the finite ones, which provides theoretical basis for the analysis of the piezoelectric energy harvester in the future.
Transient Quality Performance Evaluation of Multi-stage Flexible Manufacturing Systems
Authors: Liu Shihong , Du Shichang , Xi Lifeng
Published: May 2020

This paper aims at evaluation of the quality performance of multi-stage manufacturing system during transients. A Markovian method is constructed in order to evaluate transient propagation of quality at multi-stage manufacturing systems which have remote quality information feedback. With the derived Markovian model, analytical expressions of estimating quality metrics in transients are provided, such as settling time and dynamical quality. Case study at a factory is given to demonstrate the derived approach. The conclusions drawn illustrate the applicability of transient quality evaluation of multi-stage systems.
A Health Status Assessment Approach of Intelligent Manufacturing System based on Fuzzy Analytic Hierarchy Process
Authors: Kang Yu-Yun , Feng Gui-Fang , Sun Jie
Published: May 2020

In order to timely identify, analyze the health status of an intelligent manufacturing system, an approach based on fuzzy analytic hierarchy process (FAHP) is proposed. In the method, the random perturbation is divided into several classes and each is subdivided to several events. Then an evaluation model is constructed and it has two-layer criteria system, which can evaluate every perturbation class and the whole system at the same time. The monitoring data is expressed with 10 scales and the evaluation accuracy is more improved. FAHP is used to calculate the criteria weights. Finally, the proposed method is detailed illustrated by an example, and the method is verified.
Motion Analysis-based Design of Wall Painting Tool Storage
Authors: Ruoyue Tang , Luwei Chen , Jingya Wang
Published: May 2020

While the wall painting is applied frequently in interior design and decoration, many problems exist in the wall painting tools usage and transportation. With the interview method conducted in the investigation of the wall painters, based on the motion analysis and the economic principle of the related action, the design prototype of the wall painting tool storage was proposed. Conducting the multiple actual working scenes motion test, this design was continuously improved aiming to offer an ergonomic optimization with the appearance and function balanced design.
Design of Pre-stressed Cable Rod Radar Array Structure Based on Finite Element Analysis
Authors: Wang Jin Wei , BaoFu Tang , Cai JianGuo , Jiang HongHu
Published: May 2020

In recent years, with the increasingly high requirements of radar thinness, the radar array appears thinner and thinner, which is easy to make the stiffness of the radar array is not enough, leading to serious deformation of the radar array, and thus affecting the work of the radar and the whole machine life. As a new type of space structure with light weight and high strength, the pre-stressed cable-stayed structure can play a good role in replacing the traditional front structure. According to the overall design requirements of a radar and the RMSE requirements for the plane flatness, the pre-stressed cable-stayed structure of the radar array is preliminarily designed, and the finite element analysis results are used to optimize the design and finally meet the design requirements.
Titanium Coatings Plasma Sprayed with/without a Shroud
Authors: Zhou Hong , Peng Cheng , Liu Zhi , Al-Rawi Mohammad , Kanna Jai
Published: May 2020

Titanium coatings were deposited by plasma spraying with and without a shroud. The as-sprayed titanium coatings were then microstructurally examined. A comparison in microstructure between titanium coatings with and without the shroud was carried out. Based on the analytical results, it showed that the shroud played a critical role in protecting the titanium particles from oxidation. The presence of the shroud in the plasma spraying brought about a better heating of the particles in the plasma jet due to a mitigation of air entrainment with the shroud, thus a reduction in coating porosity was obtained. An enhanced microstructure in the shrouded titanium coatings were observed compared to the air plasma sprayed counterpart.
A New Method to Identify the Diesel Engine Modal Parameters based on Self-Excitation
Authors: Hou Biao , Liu Xing , chen Jiheng , Liu Feng , Tian Ye , Tan Jingsong
Published: May 2020

At present, the methods to study the dynamic characteristics of diesel engine structure include finite element analysis method and experimental analysis method. Among, 60% of the structural stiffness and 90% of the damping ratio of the whole diesel engine come from the joint part, and the dynamic characteristics of the joint part of the diesel engine are very complex, so it is difficult to establish an accurate finite element model, and the results of finite element analysis methods are often not accurate. For the experimental analysis method, it is mainly divided into the traditional Experimental Modal Analysis method (EMA) and the Operational Modal Analysis (OMA). The EMA it alays needs to measure the excitation force of the diesel engine and the vibration response of the structure, simultaneously. And the influence of motion factors on the structure dynamics cannot be considered. The structure is excitated by the working environment, and only analyzes the modal parameters of the structure with the vibration response. Few scholars analyze the OMA for diesel engines. This paper proposes a new method to identify the modal parameters of diesel engine based on dry run. In this paper, the design and research of the motion law of the air-running self-excitation is carried out, and the validity of the method is verified.
Based on Vibration Signal to Identify the Diesel Engine Modal Parameters under Working Condition
Authors: Liu Xing , chen Jiheng , Hou Biao , Tian Ye , Liu Feng , Tan Jingsong
Published: May 2020

The methods to study the dynamic characteristics of diesel engine structure include finite element analysis method and experimental analysis method. It is difficult to establish an accurate finite element model, since the results of finite element analysis methods are often not accurate. For the experimental analysis method, it is mainly divided into the traditional Experimental Modal Analysis (EMA) and the Operational Modal Analysis (OMA). The EMA method always needs to measure the excitation force of the diesel engine and the vibration response of the structure simultaneously. And the influence of motion factors on the structure dynamics cannot be considered. The structure is excitated by the working environment, and only analyzes the modal parameters of the structure with the vibration response. Few scholars analyze the OMA for diesel engines. This paper proposes a new method to identify the modal parameters of diesel engine based on self-excitation. In this paper, the theory of self-excitation mode parameter identification is demonstrated by derivation, and the validity of the method is verified.
Importance Measure Analysis Method for Maintenance based on Mutil-Function Testability States
Authors: Cao Zhiyuan , Dong Haiyong , Gu Qingfan , Wang Guoqing
Published: May 2020

Maintenance order plays an important role in industrial field, which influences multiple factors such as costs. Current method is based on importance measure using the fault tree analysis. Simply based on the fault tree of the failure condition, such method ignore some vital information hidden in other testability states, and may results in unsuitable maintenance order. This paper puts forward a novel method to evaluate importance measure based on multi-function testability states, which can be used to optimize the maintenance order. To illustrate the utility of this method, the article uses a vehicle model, and compares the different results to validate the effect of the proposed importance measure. This method can be utilized to evaluate the maintenance order containing multiple functions.
Neural Network Based Modelling and Steering Control of an Intelligent Vehicle Under Dynamic Sensitive Conditions
Authors: Zhang K , Wang S J , Ji L , Wang C
Published: May 2020

A neural network based modelling and steering control method of an intelligent vehicle under dynamic sensitive conditions is proposed in this paper. Four radius function neural networks are used to compensate the modelling error of a traditional dynamic vehicle steering model. The designed control law is consisted of four terms: a neural network term, a proportion term, an integral term and a robust term. Stability is analysed through Lyapunov function and the training law is generated at the same time. Test results show that the designed steering controller works quite well and is of great value in path tracking of an intelligent vehicle when the vehicle dynamics getting significant.
Adaptive Sliding Mode Control of Artillery Coordinator Based on Disturbance Observer
Authors: Gan Jinjie , Chen Longmiao
Published: May 2020

In order to improve the control accuracy of the artillery coordinator composed of hydraulic servo system under various uncertain conditions such as extreme environment, unknown disturbances, and system parameter changes, an adaptive sliding mode control strategy based on disturbance observer is designed. Sliding mode control can make the system follow the designed sliding mode dynamic surface state trajectory, and realize the control of non-linear system. Increasing adaptive control can prevent system failure due to excessive sliding mode switching gain. Based on this, disturbance observers are added, feed-forward compensation is performed, and the influence of system parameters and load torque changes on the system is reduced to reduce chattering and effectively improve control performance. The electro-hydraulic joint simulations show that the algorithm can make the system meet the control requirements under complex working conditions under different coordination angles, ammunition and no-load conditions.