Application of the Continuous and Discontinuous Fields of Plastic Deformations to the Evaluation of the Initial Thickness of Bent Tubes

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Zdzisław Śloderbach
Keyword(s):  
Generalized Solution ◽  
External Diameter ◽  
Technical Standard ◽  
Initial Thickness ◽  
Plastic Deformations ◽  
A Value ◽  
Calculation Results ◽  
Material Coefficient ◽  
Continuous Fields ◽  
Suitable Measure

The paper presents the derived equations for calculations of the initial wall thickness g0 of a tube bent to elbow. The expressions for calculating g0 are presented in a suitable measure of the “great active actual radius Rj” in the bending zone for an exact-generalized solution (continuous fields) and for three formal simplifications (discontinuous fields) of the first-, second-, and third-orders. The expressions to calculate the components of deformation for a generalized solution (continuous fields) are obtained on the basis of kinematically admissible fields of plastic deformations. In any case, a value of initial tube thickness depends on the radius and on the angle of bending αb on the external diameter of the tube, on the displacement of the neutral axis, and on the allowable (required) elbow thickness according to European, American, or other national technical standard or regulations. The initial thickness also depends on the coordinates of the point where the allowable thickness was determined and on the technological–material coefficient of the bending zone range k (defined during the tests). The obtained calculation results are presented in the form of graphs and in table.

scholarly journals Geographic Information Systems Application to Drought Distribution Identification with Standardized Precipitation Index (SPI) Method in Trenggalek Regency

2021 ◽  
Vol 5 (2) ◽  
pp. 266-278
Author(s):  
Aditya Utama ◽  
Mohammad Pramono Hadi ◽  
Emilya Nurjani
Keyword(s):  
Standardized Precipitation Index ◽  
Precipitation Index ◽  
Analysis Method ◽  
A Value ◽  
Distance Weighted ◽  
Calculation Results ◽  
Negative Impacts ◽  
The Standardized Precipitation Index ◽  
Inverse Distance ◽  
Rain Data

The widespread drought area in Trenggalek Regency in 2019 needs to be analyzed to reduce negative impacts and as a monitoring tool to anticipate future drought events. The Standardized Precipitation Index (SPI) is a drought analysis method by calculating the rainwater deficit at various time scales used to identify the distribution of drought in Trenggalek Regency. This study using rain data on 13 rain stations for the period 1990-2019 and agricultural production data for 2019. The calculation results show that the highest SPI value occurred in March at the highly wet level with a value of 2.11. The lowest SPI value occurred in May at the extremely dry level with a value of -2.31. The results are then mapped using ArcGIS with the Inverse Distance Weighted (IDW) method to identify the spatial distribution of drought.

scholarly journals OPTIMIZATION OF B-SERIES PROPELLER DESIGN AS KCR 60 PROPULSOR TO ACHIEVE OPTIMAL PERFORMANCE USING MATHEMATICAL MODEL

JOURNAL ASRO ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 83
Author(s):  
Akhmat Nuryadin ◽  
Abdul Rahman ◽  
Cahyanto Cahyanto
Keyword(s):  
Objective Function ◽  
Area Ratio ◽  
Diameter Ratio ◽  
Decision Variable ◽  
Propeller Design ◽  
A Value ◽  
Decision Variables ◽  
Blade Area ◽  
Calculation Results ◽  
Constraint Variable

The process of designing a propeller as a ship propulsor is an important step to produce a propeller that has the ability to achieve the desired target speed of the ship. Propeller optimization is an effort to produce a propeller design with optimal capabilities. This propeller design uses a B-series propeller where this propeller is commonly used as ship propulsor. Optimization steps to find the optimal propeller, namely: determining the objective function, determining the decision variable, and determining the constraint variable. The objective function of this optimization is to determine the Advanced-optimal (J-opt) coefficient value for the propeller. The J-opt coefficient must have a value greater than the J-Design coefficient (J-d) value and the smallest possible value (minimization function). For decision variables include picth diameter ratio (P / D) and Blade area ratio (Ae / Ao) and number of leaves (Z). While the constraint variables are: the pitch diameter ratio value of the B-series propeller (0.5≤P/D≤1.4), the blade area ratio B-series (0.3≤Ae/Ao≤1, 05) as well as the number of blade (2≤Z≤7). From the calculation results of the optimization of the B-series propeller design for the KCR 60, the optimum value is different for each blade. the propeller with the number of blade 2 (Z = 2) obtained the optimum propeller with the value of J-opt =0.77098733, Ae/Ao=0.3, P/D=1.13162337, KT = 0.165632781, 10KQ=0, 27546033 and efficiency=0.73198988. Popeller with number of blades 3 (Z=3) obtained optimum propeller with J-opt value=0.77755594, Ae/Ao=0.3, P/D=1.06370107, KT=0.168069763, 10KQ=0.28984068 and efficiency=0.70590799. Propeller with number of blades 4 (Z=4) obtained optimum propeller with J-opt value=0.78478688, Ae/Ao=0.45954773, P/D=1.03798312, Kt=0.172147709, 10Kq= 0.3091063 and efficiency=0.67797119. Propeller with blades number 5(Z=5) obtained optimum propeller with J-opt value=0.78575616, Ae/Ao=0.65607164, P/D=1.02716571, KT=0.174099168, 10KQ=0.31376705 and efficiency=0.67547177. Propeller with blades number 6 (z=6) obtained optimum propeller with J-opt value=0.78867357, Ae/Ao=0.71124343, P/D=1.0185055, KT=0.176525247, 10KQ=0.32215257 and efficiency =0.66705719. Propeller with number of blades 7 (Z=7) obtained optimum propeller with J-opt value=0.7949898, Ae/Ao=0.69772623, P/D=1.01780081, KT=0.181054792, KQ=0.34011349 , and efficiency =0.64804328.Keywords : KCR, Optimization,Wageningen B-series.

scholarly journals ANALYSIS OF SUSTAINABILITY INDEX USAHATANI CABAI IN BANGLI REGENCY

2018 ◽  
pp. 99
Author(s):  
I Nyoman Gede Ustriyana ◽  
Ni Wayan Putu Artini
Keyword(s):  
Sustainable Development ◽  
Agricultural Development ◽  
Composite Index ◽  
Sustainability Index ◽  
A Value ◽  
Index Analysis ◽  
Index Measurement ◽  
Calculation Results ◽  
Index Calculation ◽  
Structured Questionnaire

There are many experts who disagree on the meaning of the concept of sustainable development. Nevertheless sustainable agriculture has been known to be one of important factor in realizing sustainable development. It is therefore very relevant to conduct a research in order to measure the sustainability of agricultural development through sustainability index measurement. In this study analyzed thesustainability is using composite index calculation method. Methods of data collection was conducted through interviews using structured questionnaire survey conducted to total of 60 respondent of chili farmers in Bangli Regency. The calculation results of the sustainability index of 30 variables obtained shows that only 1 variables were categorized as “high”, 20 variables were in “medium” categoryand 9 variables were in “low” category. From the results obstained the composite index analysis showed a combined index categorized as “medium” with a value of 0.47.

scholarly journals Kecerdasan Emosional Serta Dampaknya Untuk Kinerja Pegawai Dinas Pekerjaan Umum Dan Penataan Ruang Kota Pematangsiantar

2020 ◽  
Vol 11 (2) ◽  
pp. 152
Author(s):  
Sudung Simatupang ◽  
Efendi Efendi
Keyword(s):  
Emotional Intelligence ◽  
Employee Performance ◽  
Main Task ◽  
Font Size ◽  
Significance Level ◽  
The Public ◽  
A Value ◽  
Calculation Results ◽  
The Individual ◽  
Positive Effect

<p class="MsoNoSpacing"><span style="font-size: 12.0pt; font-family: 'Times New Roman',serif; mso-ansi-language: EN;" lang="EN">Form of service to the public. is the main task of the citizens of all citizens, because the form of service can be done well, good performance is also needed. Factors that influence performance Then, emotional intelligence can be agreed to control the individual within yourself. </span><span style="font-family: 'Times New Roman', serif; font-size: 12pt;">The results found that the variable does not require emotional intelligence and the variable called normal distribution with the provisions of the two-way test value&gt; Sig 0.05, which means all variables are normally distributed. Furthermore, the results of the calculation of the path of positive calculation results with a value of Y = 9.885 + 0.805, which means the influence of emotional intelligence increases positive effect on employee performance, as well as the results of tests to answer the hypothesis (t test) shows the tcount data with a value of 10.898 for the variable emotional intelligence&gt; with the results of ttable degree of trust received 1.99773 and the significance level of 0.000 &lt;0.05, the conclusion of this study received an answer from the hypothesis</span></p><pre id="tw-target-text" class="tw-data-text tw-text-large XcVN5d tw-ta" style="unicode-bidi: isolate; font-size: 28px; line-height: 36px; background-color: #f8f9fa; border: none; padding: 2px 0.14em 2px 0px; position: relative; margin: -2px 0px; resize: none; font-family: inherit; overflow: hidden; width: 277px; white-space: pre-wrap; overflow-wrap: break-word; color: #222222;" dir="ltr" data-placeholder="Terjemahan"> </pre>

scholarly journals The Comparison of Data Mining Methods Using C4.5 Algorithm and Naive Bayes in Predicting Heart Disease

Tech-E ◽  
2021 ◽  
Vol 4 (2) ◽  
pp. 44
Author(s):  
Rino Rino
Keyword(s):  
Data Mining ◽  
Heart Disease ◽  
Naive Bayes ◽  
Naïve Bayes ◽  
Data Set ◽  
A Value ◽  
C4.5 Algorithm ◽  
Calculation Results ◽  
Mining Methods ◽  
Bayes Algorithm

Heart disease is a condition of the presence of fatty deposits in the coronary arteries in the heart which changes the role and shape of the arteries so that blood flow to the heart is obstructed. Data mining methods can predict this disease, some of the methods are C4.5 Algorithm and Naive Bayes which are often used in research.The data set in this research was obtained from the uci machine learning repository site, where the dataset has 3546 records and 13 attributes.The accuracy value of the Naïve Bayes algorithm has a high value of 81.40% compared to the C4.5 algorithm which only has an accuracy value of 79.07%. Based on the calculation results, it can be concluded that the Naïve Bayes Algorithm is a very good clarification because it has a value between 0.709 - 1.00.From conclusion above, the Naïve Bayes algorithm has a higher accuracy value than the C4.5 algorithm so the researchers decided to use the Naïve Bayes algorithm in predicting heart disease.

scholarly journals PREDIKSI PELUANG KEMATIAN DAN KELAHIRAN MURNI PENDUDUK KABUPATEN MERAUKE MENGGUNAKAN METODE BIRTH AND DEATH PROCESS

2021 ◽  
Vol 15 (1) ◽  
pp. 095-102
Author(s):  
Minuk Riyana ◽  
Marius Agustinus Welliken K.
Keyword(s):  
Population Data ◽  
The Elderly ◽  
Death Process ◽  
Initial Time ◽  
Time Interval ◽  
Birth And Death Process ◽  
Female Sex ◽  
A Value ◽  
Calculation Results ◽  
Process Method

This study aims to estimate the probability of birth and death purely based on gender and population data of Merauke City. The chance of birth and death will be used to estimate the life table of the elderly in a population of the City of Merauke. The method used in this research is the birth and process method. The Birth and death process method which is a Poisson distribution is used to predict the chances of birth and death at time t. If the birth and death process fulfills the linearity requirements, then the processes are called the Yule-Furry process. This research discusses the stochastic process of pure birth-death with two sexes in the Yule-Furry Process. From the data on the population of Merauke district which is divided based on the sex of men and women using the pure birth and death model, the calculation results show that the probability value at the time interval 0 ≤ t <1 hour, at the initial time t = 0, the chance of individual birth at female sex is stationary at a value of 0.1762, while the chance of individual death for female sex is stationary at a value of 0.00154. The odds of birth and death in male individuals are stationary at a value of 0.305034 and 0, 059487.

scholarly journals Cost and Benefit Analysis of Sports Tourism in Downhill Trek, Cikole Lembang, Bandung Barat District, West Java Province

2021 ◽  
Vol 5 (1) ◽  
pp. 1-9
Author(s):  
Hery Sigit Cahyadi ◽  
Herlan Suherlan ◽  
Muhammad Aldo Dewantara
Keyword(s):  
Cost Benefit ◽  
Sport Tourism ◽  
Benefit Analysis ◽  
Cost And Benefit ◽  
A Value ◽  
Cost Benefit Ratio ◽  
Calculation Results ◽  
Cost And Benefit Analysis ◽  
The Cost ◽  
Benefits And Costs

The purpose of the research is to analyze the cost and benefit analysis and find out the feasibility of sport tourism development at Cikole, Lembang in support the lacal community income. This research was conducted at the Downhill Track Cikole Bike Park in Lembang District and is a tourist attraction in the form of downhill bicycle track facilities. The number obtained is the result of calculating the comparison between benefits and costs and shows the value that can be defined as a feasible activity, because the numbers obtained have a value of more than 1 which is an indication of eligibility with a results in the form of> 1 declared feasible and if <1 (less of) is declared ineligible. Based on the calculation results of the Cost-Benefit Ratio (CBR) analysis with the final result in the form of a comparison value of 3,3128528. With the increase in the number of visits and opening of new jobs, the results of the analysis in the form of downhill activities have been declared feasible.

scholarly journals PERENCANAAN DESAIN FASILITAS PEJALAN KAKI DI KAWASAN PERKOTAAN DI KOTA MALANG

2018 ◽  
Vol 18 (2) ◽  
pp. 97
Author(s):  
Dwi Widiyanti
Keyword(s):  
Data Analysis ◽  
Urban Environment ◽  
Urban Areas ◽  
Service Level ◽  
Safety Level ◽  
Human Scale ◽  
A Value ◽  
Calculation Results ◽  
Inventory Survey ◽  
Pedestrian Space

ABSTRACTThe City of Malang is one of the cities with the level of traffic disruption that is large enough for daily activities since the population density is quite high. Humane urban environment is a friendly urban environment for pedestrians who have the size and dimensions based on a human scale. Such attempts can be done through the development of a pedestrian area and the provision of adequate pedestrian facilities in urban areas, especially in the downtown area. This study aims to determine and identify pedestrian facilities, determine the needs of pedestrian facilities planning and design of pedestrian facilities. Methods of data collection in this study are road inventory survey, calculation of the traffic volume and pedestrian survey. The analysis method using in this research is the analysis of the characteristics of pedestrians. The results of this study showed that pedestrian facilities in Trunoyo street, Malang city has required for a service level C since the value of the pedestrian space is 3.36 m² per person and MT. Haryono street has a value of 3.30 m² space walkers per person. In terms of the facilities provided for pedestrians, street of Trunojoyo and MT. Haryono still inadequate. Based on data analysis, Trunojoyo street has a value of average PV² highest for 2.1 x 108 and MT. Haryono street has a value of 1.3 x 108. From the result of the data analysis and discussion the construction of pedestrian facilities need to be done in order to increase the safety level of pedestrian and based on the calculation results of the PV² Trunojoyo street and MT. Haryono street are needed to be provided with zebra cross.ABSTRAKKota Malang merupakan salah satu kota dengan tingkat gangguan lalu lintas yang cukup besar karena merupakan salah satu kota dengan aktivitas harian dan tingkat kepadatan penduduk cukup tinggi. Lingkungan perkotaan yang manusiawi adalah lingkungan perkotaan yang ramah bagi pejalan kaki yang mempunyai ukuran dan dimensi berdasarkan skala manusia. Upaya ke arah itu dapat dilakukan melalui pengembangan kawasan pejalan kaki serta penyediaan fasilitas pejalan kaki yang memadai di kawasan perkotaan, terutama di kawasan pusat kota. Penelitian ini bertujuan untuk mengetahui dan mengidentifikasi fasilitas pejalan kaki, menentukan kebutuhan fasilitas pejalan kaki dan perencanaan desain fasilitas pejalan kaki. Metode pengumpulan data dalam penelitian ini adalah survei inventarisasi jalan, survei perhitungan volume lalu lintas dan survei pejalan kaki. Metode pengolahan data dalam penelitian ini adalah analisis karakteristik pejalan kaki. Hasil dari penelitian ini antara lain fasilitas pejalan kaki di ruas Jalan Trunoyo, Kota Malang memiliki tingkat pelayanan C karena nilai ruang pejalan kaki 3,36 m²/orang dan ruas Jalan MT. Haryono memiliki nilai ruang pejalan kaki 3,30 m²/orang. Dari segi penyediaan fasilitas pejalan kaki, ruas Jalan Trunojoyo dan ruas Jalan MT. Haryono masih kurang memadai. Berdasarkan analisis data, ruas Jalan Trunojoyo memiliki nilai PV² rata-rata tertinggi 2,1 x 108 dan Ruas Jalan MT. Haryono 1,3 x 108. Untuk itu perlu dilakukan pembangunan fasilitas pejalan kaki untuk meningkatkan keselamatan pejalan kaki sedangkan jika dilihat dari perhitungan PV² maka ruas Jalan Trunojoyo dan MT. Haryono perlu adanya penyediaan kembali zebra cross.

scholarly journals Designs of PMSMs with Inner and Outer Rotors for Electric Bicycle Applications

2019 ◽  
Vol 4 (1) ◽  
pp. 20-25
Author(s):  
Harwan Mohammed Taha ◽  
Ismaeil Alnaab
Keyword(s):  
Permanent Magnet ◽  
Motor Performance ◽  
High Efficiency ◽  
Permanent Magnet Synchronous Motor ◽  
External Diameter ◽  
Outer Rotor ◽  
Reasonable Cost ◽  
Calculation Results ◽  
Electric Bicycle ◽  
Supply Current

In this paper, designs of two rotor structures of permanent magnet synchronous motor (PMSM) are proposed in order to find the suitable one to drive an electric bicycle, namely, inner rotor and outer rotor. Both motors are designed to run at a rated speed of 20 Km/h and rated power of 250 W. This paper compares the performance of both proposed motors and the comparison between them is in terms of motor size, weight, cost and efficiency. In addition, this work uses the second design, which is the PMSM with outer rotor to investigate the effects of some motor parameters on motor performance; the parameters are current, advanced angle, stack length and external diameter. In this work, Motor Solve software is used to design and analyze the performance of both motors. According to the simulation and calculation results, both motors achieved the required rated speed and torque at high efficiency and reasonable cost. Nevertheless, the PMSM with inner rotor obtained the required specifications with lighter weight and smaller size than the PMSM with outer rotor. Therefore, it is a proper choice for driving an electric bicycle that has a limitation regarding the motor space. Regarding parameters’ effect, the simulation figures and data show that the motor torque will increase if we increase supply current, stack length and external diameter, while speed decreases as it inversely changes with torque. Except for advance angle which helps motor to produce maximum possible torque at a higher speed.  

scholarly journals PENERAPAN PERSAMAAN GEOTERMOMETER (SiO2)p DI LAPANGAN PANAS BUMI SULI, AMBON

2012 ◽  
Vol 6 (2) ◽  
pp. 33-36
Author(s):  
Helda Handayani
Keyword(s):  
Hot Springs ◽  
Hot Spring ◽  
Chloride Concentration ◽  
Hot Water ◽  
Reservoir Temperature ◽  
A Value ◽  
Calculation Results ◽  
High Chloride Concentration ◽  
Rms Error ◽  
High Chloride

Suli hot springs area has a low level of acidity or neutral pH ranges (7,2–7,7). It is also supported by a high chloride concentration value, which ranges (208,87-226,27) ppm. Thisshows that the area on station 1, 2, 3, and 4 are located in areas with water flow into the upper reservoir (upflow) and belongs to hot water domination reservoir tipe (water heatedreservoir). Reservoir temperature is calculated by the formula geotermometer (SiO2)p considered whether applied in the four kinds geotermometer equation because it gives the calculation results are not much different temperature and has a value of rms-error is less than 2%. Reservoir temperature at a hot springs station Suli possible temperature (161 ± 0,9)oC. Reservoir temperature at station 2 hot spring Suli possible hot water temperature (172 ± 1,0)oC. Reservoir temperature at station 3 hot springs Suli possible temperature (171 ±0,9)oC. Reservoir temperature at station 4 hot springs Suli possible temperature (169 ± 1,0)oC.

Sign in / Sign up

Export Citation Format

Share Document