Terrain feature Extraction from OLI sensor images Abstract: Geomorphologic features and processes related to it, is origin of many of the hazards and environmental resources. Also, due to the formation of industry and science geomorphotorism and finally be necessary of More
Terrain feature Extraction from OLI sensor images Abstract: Geomorphologic features and processes related to it, is origin of many of the hazards and environmental resources. Also, due to the formation of industry and science geomorphotorism and finally be necessary of the study these features for civil projects, will be more important Cater these maps. With widespread use of geospatial sciences Such as remote sensing, geographic information systems, and its application in the study of Earth Sciences in the study of OLI sensor images for mapping Valley, Blade, Alluvial Fans and Debris Fans were used. And using visual interpretation features were extracted. Results were compared with images of Esri's World Imagery of ArcGIS Online, The parameters of correctness, completeness, quality and Kappa were calculated. And the results thus obtained, the accuracy of 80 percent, overall accuracy 62/01 percent, quality 53/87 percent and kappa coefficient was 49/74 percent. The results showed that successfully detects all features except Debris Fans has been satisfactory. According to the Kappa coefficient is determined that segmentation done for features extraction is appropriate.
Manuscript profile
Always in the production of turbine blades tried use less of secondary operations. Such as for increasing the quality of surface finishing that reduces the level of geometric accuracy. Accordingly in this paper, improvement of roughness and surface texture turbine blade More
Always in the production of turbine blades tried use less of secondary operations. Such as for increasing the quality of surface finishing that reduces the level of geometric accuracy. Accordingly in this paper, improvement of roughness and surface texture turbine blade directly with the optimization of machining parameters is been studied. Variable parameters of this research include tool diameter, depth of cut and feed rate. Experimental work by using a four-axis CNC milling machine was done on turbine blade aluminum. Experimental work by using four-axis CNC milling machine and the turbine blade was aluminum. Design of experimental was full factorial and All permutations of variable parameters been implemented. The surface roughness of machined areas by using surface roughness tester and the texture was examined using a stereo microscope. By using roughness tester, surface roughness of machined areas was measured. Form of surface texture was examined by a stereo microscope. Finally, by comparing data the best mode was introduced.
Manuscript profile
Attempts at research across various industries to achieve high-quality surfaces have led to the development of new finishing processes. Magnetic Abrasive Finishing is a novel technique where a magnetic field is employed to control an abrasive tool. Gas turbine compresso More
Attempts at research across various industries to achieve high-quality surfaces have led to the development of new finishing processes. Magnetic Abrasive Finishing is a novel technique where a magnetic field is employed to control an abrasive tool. Gas turbine compressor blades are among the industrial components requiring high surface quality due to their exposed surfaces. The reduction in surface roughness on these components has a significant impact on the efficiency of motor turbines. This paper focuses on studying the Magnetic Abrasive Finishing process parameters for the free surfaces of Titanium blades. Using a mass Magnetic Abrasive Finishing machine, the influence of powder weight, type of abrasive particles, and gap on the variation of surface roughness is investigated through statistical methods such as the response surface. The fabrication of the machine and determination of magnet polarity are carried out using Maxwell simulation software. The Factorial method is employed for experiment configuration. Mechanically alloyed powders produced by ball mills are used in this study. Results demonstrate that employing the magnetic abrasive method can reduce the surface roughness of the blade by up to 33%. The empirical model derived from regression analysis is utilized to predict the variation in surface roughness. Variance analysis of the experimental results indicates the significance of all studied parameters. Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) are employed for a qualitative evaluation of the results.
Manuscript profile
Important labyrinth spillway of hydraulic structures to regulate and control the flow of water in canals, rivers and reservoirs dams are considered important. Labyrinth spillway by increasing the length of the spillway crest on the slope in a given headwater they will i More
Important labyrinth spillway of hydraulic structures to regulate and control the flow of water in canals, rivers and reservoirs dams are considered important. Labyrinth spillway by increasing the length of the spillway crest on the slope in a given headwater they will increase the current carrying capacity. The main objective of this study is the effect of different screen angle and height of directorial on discharge coefficient on trapezoid labyrinth spillway. For this purpose, after doing dimensional analysis by Buckingham method, the relationship resulted in the discharge coefficient (Cd) function of parameters such as the angle of the blades (θ), blades height (hb) and hydraulic load ratio was to spillway height (H0⁄P). The present research experiments have been done on a flume was of 12m, a width of 30cm and a height of 50cm. the results showed that the rise directorial blade angle for a constant and fixed height (7/5, 15, 22/5) led to the discharge coefficient for all the hydraulic load decreases, the reason for this increase confusion and turbulence in the flow lines over spillway and followed by abnormality in bleeding time is different for hydraulic loads ratio the highest spillway discharge coefficient is an spillway with 30 degree angle blades. The results showed that the increasing discharge coefficient of a spillway control to a spillway was a height of 7/5 and 15cm blade respectively. In other words, the ultimate increase of a discharge
Manuscript profile
These spillways (Stepped shaft spillways) pass more flow discharges through themselves in comparison to smooth spillways theoretically. Therefore knowing of flow behavior of these Spillways, help using better and more efficiently. Moreover, using vortex breaker has grea More
These spillways (Stepped shaft spillways) pass more flow discharges through themselves in comparison to smooth spillways theoretically. Therefore knowing of flow behavior of these Spillways, help using better and more efficiently. Moreover, using vortex breaker has great effect on passing Flow through Shaft Spillway. For using more efficiently, the risk of flow water head on the crest decreases to less than fluid vapor water head on the crest , called cavitation’s, should be prevented as far as possible. At this research, it has been tried to study different behavior of Stepped chamber and different vortex breaker shapes on spillway flow. From the viewpoint of the effects of flow regime changes on spillway, changes of step dimensions, and the change of type of flow range will Studied Effectively. And finally the best the relation between water head on the crest and Discharge Coefficient are determined.
Manuscript profile
هدف اصلی این مقاله، بررسی سازهای پره کامپوزیتی یک بالگرد انتخاب شده میباشد. در این تحقیق به بررسی تنشهای وارد شده بر پرههای روتور (ملخ)، در اثر نیروهای گریز از مرکز، لیفت، درگ و گشتاور پیچشی پرداخته میشود. معادلات حاکم بر رفتار سازه و حل معادلات را در برنام More
هدف اصلی این مقاله، بررسی سازهای پره کامپوزیتی یک بالگرد انتخاب شده میباشد. در این تحقیق به بررسی تنشهای وارد شده بر پرههای روتور (ملخ)، در اثر نیروهای گریز از مرکز، لیفت، درگ و گشتاور پیچشی پرداخته میشود. معادلات حاکم بر رفتار سازه و حل معادلات را در برنامه متلب بدست آورده و شبیهسازی با استفاده از نرم افزار آباکوس انجام داده شده و با یکدیگر مقایسه میشوند. برنامه نوشته شده در متلب، براساس تئوری المان تیر بوده و محاسبه تنشها و جابجاییهای المانهای درنظر گرفته شده پره از ویژگیهای کد تدوین شده است. در نرم افزار آباکوس، پره بالگرد در حالتهای مختلف اعم از پره آلومینیومی و کامپوزیتی با و بدون وب و پره کامپوزیتی با لایه چینیهای دارای زوایای مختلف شبیهسازی شده است. نتایج این حالات گوناگون با یکدیگر و با کد مقایسه گردیدهاند. در نهایت، نتایج با مقاله مرجع مقایسه شده است. مقایسه بین نتایج المان تیر و شبیه سازی آباکوس از تطابق خوبی برخوردار است. به منظور بهینه سازی ملخ کامپوزیت باید عواملی همچون کاهش مقدار جابجایی، کاهش میزان تنش و جلوگیری از افزایش بیش از حد وزن در نظر گرفته شود، بهطوریکه با افزایش ضخامت لایه های 90 و 45 درجه به 6.5 میلیمتر، ماکزیمم جابجایی 12.9 سانتیمتر و وزن کل سازه 8 کیلوگرم خواهد شد.
Manuscript profile
در این پژوهش تاثیر مکان میله‏ها‏ی‏ حلقوی در فرکانس طبیعی پره‏‏های مرحله آخر توربین بخار بررسی شده است. پره‏های توربین اجزاء بحرانی و مهمی در نیروگاه‏ها هستند. یکی از پارامترهای مهم در پره‏ها، محل قرار گرفتن میله‏های حلقوی است. ابتدا ب More
در این پژوهش تاثیر مکان میله‏ها‏ی‏ حلقوی در فرکانس طبیعی پره‏‏های مرحله آخر توربین بخار بررسی شده است. پره‏های توربین اجزاء بحرانی و مهمی در نیروگاه‏ها هستند. یکی از پارامترهای مهم در پره‏ها، محل قرار گرفتن میله‏های حلقوی است. ابتدا برای تولید مدل هندسی سه بعدی پره از اسکن سه بعدی کمک گرفته شده است و پس از اطمینان از مدل‏سازی تک پره، به فرآیند مونتاژ پره‏های مرحله آخر توربین فشار ضعیف و شبیه‏سازی اجزاء محدود پرداخته می‏شود. در این مرحله از پره های توربین، دو ردیف میله‏ی حلقوی وجود دارد که در این مقاله، تاثیر موقعیت میله‏های حلقوی نسبت به ریشه، روی فرکانس طبیعی سیستم بررسی شده است. با توجه به نیروهای تحریک‏کننده‏ مدل، نتایج بدست آمده از فرکانس‏های طبیعی، شکل مودها و نمودار کمپل نشان می‏دهد که در مکان‏های مختلف از میله‏های حلقوی مورد بررسی، تشدیدی در این ردیف پره ها رخ نمی‏‏دهد.
Manuscript profile
Sanad
Sanad is a platform for managing Azad University publications