پاورپوینت اصول طراحی پست های فشار قوی MV Cable Types

اختصاصی از یارا فایل پاورپوینت اصول طراحی پست های فشار قوی MV Cable Types دانلود با لینک مستقیم و پر سرعت .

نوع فایل:  ppt _ pptx ( پاورپوینت )

( قابلیت ویرایش )

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 قسمتی از اسلاید : 

تعداد اسلاید : 11 صفحه

بسم الله الرحمن الرحیم اصول طراحی پست های فشار قوی MV Cable Types Types Of MV Power Cables (5-46kV) The seven types are: Teck Cables Shielded Cables Concentric Neutral Cables Paper-Insulated Lead-Covered Cables Submarine Cables Mining Cables Aluminum-Sheathed Cables In the cable descriptions a number of insulation and jacket materials have been abbreviated as follows: Cross-Linked Polyethylene (XLPE) Ethylene-Propylene Rubber (EPR) Polyvinyl Chloride (PVC) Polyethylene (PE) Tree-Retardant Cross-Linked Polyethylene (TR-XLPE) Teck Cables Teck Cables were originally developed for use in mines, but they are now widely used in primary and secondary industries, chemical plants, refineries and general factory environments. They are also used in multi-storey and commercial buildings. They are flexible, resistant to mechanical abuse, corrosion resistant, compact and reliable.
Shielded Cables Shielded Power Cable may be single-or three-conductor. The basic construction begins with a conductor of annealed, bare, solid or concentric - stranded copper, which may be compact or compressed.
This is followed by a semi-conducting conductor shield, insulation, and then a semi-conducting insulation shield.
Concentric Neutral Cables These power cables may be used in dry or wet locations, for a wide variety of types of installations, and may be single- or three-conductor.
The two standard constructions are Unjacketed and Jacketed, the latter being most frequently used. The conductor is typically annealed, bare, stranded copper, but tin-coated wire and solid conductors are also available. The concentric neutral conductor, from which the cable derives its name, is bare or tin-coated copper wire, applied helically over the insulation shield.
These wires act as the metallic component of the shield and the neutral, at the same time.
Paper-Insulated Lead-Covered Cables PILC cables are used in power distribution and industrial applications, and they may be installed exposed, in underground ducts or directly buried. Their design begins with annealed, bare copper conductor(s) which may be round, concentric, compressed or compact stranded, compact sector, and in larger sizes Submarine Cables For submarine installations , usually Self-Contained Liquid-Filled Cables (SCLF), or Solid Dielectric Cables are selected , depending on voltage and power load. SCLF Cables are capable of handling very high voltages.
However, for medium-voltage installations, a Solid Dielectric Cable can easily fulfill the electrical demands of the system.
Mining Cables A number of different types of cables are used in mines.
There are fixed mining cables and portable mining cables, the latter being described here. The key requirements of porta

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Modeling Fuzzy Data with Fuzzy Data Types in Fuzzy Database and XML Modelsn

اختصاصی از یارا فایل Modeling Fuzzy Data with Fuzzy Data Types in Fuzzy Database and XML Modelsn دانلود با لینک مستقیم و پر سرعت .

عنوان انگلیسی :                       Modeling Fuzzy Data with Fuzzy Data Types in Fuzzy Database and XML Modelsn

عنوان فارسی :

مدل سازی داده های فازی با انواع داده های فازی در پایگاه داده فازی و مدل های XML

Abstract: Various fuzzy data models such as fuzzy relational databases, fuzzy object-oriented databases, fuzzy objectrelational databases and fuzzy XML have been proposed in the literature in order to represent and process fuzzy information in databases and XML. But little work has been done in modeling fuzzy data types. Actually in the fuzzy data models, each fuzzy value is associated with a fuzzy data type. Explicit representations of fuzzy data types are the foundation of fuzzy data processing. To fill this gap, in this paper, we propose several fuzzy data types, including fuzzy simple data types, fuzzy collection data types and fuzzy defined data types. We further investigate how to declare the fuzzy data types in the fuzzy object-oriented database model and fuzzy XML Schema. The proposed fuzzy data types can meet the requirement of modeling
fuzzy data in the fuzzy databases and fuzzy XML.

تعداد صفحات انگلیسی : 6 صفحه

عنوان فارسی :

مدل سازی داده های فازی با انواع داده های فازی در پایگاه داده فازی و مدل های XML

چکیده

 مدل های مختلف داده های فازی مانند پایگاه داده های رابطه ای فازی ، پایگاه داده شی گرا فازی، پایگاه داده های مبتنی بر رابطه بین اشیا فازی و XML فازی به منظور نشان دادن و پردازش اطلاعات فازی در پایگاه داده ها و XML در ادبیات ارائه شده است. اما کاراندکی برای مدل سازی انواع داده های فازی انجام شده است. در واقع در مدل داده های فازی، هر مقدار فازی با یک نوع داده فازی در ارتباط است. بازنمایی صریح از انواع داده های فازی پایه و اساس پردازش داده های فازی است. برای پر کردن این شکاف، در این مقاله، ما انواع مختلف داده های فازی را از جمله انواع داده های فازی ساده ، انواع داده های مجموعه های فازی و انواع داده تعریف شده فازی ارائه می دهیم. ما نحوه بیان انواع داده های فازی را در مدل پایگاه داده شی گرا فازی و طرحواره XML فازی بیشتر بررسی می کنیم. انواع داده های فازی پیشنهادی می توانند به الزامات مدل سازی داده های فازی در پایگاه داده های فازی و XML فازی دست یابند.

کلمات کلیدی: مدل های پایگاه داده، داده های فازی، انواع داده های فازی، پایگاه داده های فازی، XML فازی، مدل سازی.

تعداد صفحات ترجمه فارسی : 14 صفحه

مقاله GEAR TYPES (همراه با عکس)

اختصاصی از یارا فایل مقاله GEAR TYPES (همراه با عکس) دانلود با لینک مستقیم و پرسرعت .

تعداد صفحات : 20
فرمت فایل : pdf (قابل ویرایش)
فهرست مطالب :
Angular Bevel Gears
Bevel Gears
Types
Applications
Crown Wheel and Pinion
Application
Cycloidal
Gearing Mec
hanism Gears
Differential Gears
Types of Differential Gears
External Gear
Face Gear
Girth Gears
Hardened and Ground Gears
Helical Gears
Gear Configuration
Applications
Disadvantage
Helical Bevel Gears
Herringbone Gears
Internal Gears
Involute Gears
Non-Involute Gears
Winch Gears
Angular Bevel Gears
These are bevel gears whose shafts are set at an angle other than 90 degrees. They are useful when the direction of a shaft's rotation needs to be changed. Using gears of differing numbers of teeth can change the speed of rotation. These gears permit minor adjustment of gears during assembly and allow for some displacement due to deflection under operating loads without concentrating the load on the end of the tooth. For reliable performance, Gears must be pinned to shaft with a dowel or taper pin. The bevel gears find its application in locomotives, marine applications, automobiles, printing presses, cooling towers, power plants, steel plants, defence and also in railway track inspection machine. They are important components on all current rotorcraft drive system.
Bevel Gears
They connect intersecting axes and come in several types. The pitch surface of bevel gears is a cone. They are useful when the direction of a shaft's rotation needs to be changed. Using gears of differing numbers of teeth can change the speed of rotation. They are usually mounted on shafts that are 90 degrees apart, but can be designed to work at other angles as well. These gears permit minor adjustment during assembly and allow for some displacement due to deflection under operating loads without concentrating the load on the end of the tooth. For reliable performance, Gears must be pinned to shaft with a dowel or taper pin. Bevel gear sets consist of two gears of different pitch diameter that yield ratios greater than 1:1. Types The teeth on bevel gears can be straight, spiral or bevel. In straight bevel gears teeth have no helix angles. They either have equal size gears with 90 degrees shaft angle or a shaft angle other than 90 degrees. Straight bevel angle can also be with one gear flat with a pitch angle of 90 degrees. In straight when each tooth engages it impacts the corresponding tooth and simply curving the gear teeth can solve the problem. Spiral bevel gears have spiral angles, which gives performance improvements. The contact between the teeth starts at one end of the gear and then spreads across the whole tooth. In both the bevel types of gears the shaft must be perpendicular to each other and must be in the same plane. The hypoid bevel gears can engage with the axes in different planes. This is used in many car differentials. The ring gear of the differential and the input pinion gear are both hypoid. This allows input pinion to be mounted lower than the axis of the ring gear. Hypoid gears are stronger, operate more quietly and can be used for higher reduction ratios. They also have sliding action along the teeth, potentially reducing efficienc
Crown Wheel and Pinion
A crown wheel is a wheel with cogs or teeth set at right angles to its plane and the pinion is a small cogwheel that meshes with the crown wheel. Crown wheel and pinion have excellent heat distortion control, high strength, wear resistance property and noiseless and vibration free operation. They are made of fine-grained steel billet. The pinion thread is specially made on the thread grinder to ensure proper fitting. Tooth contact of a crown pinion is inspected on a Gleason machine at regular intervals of time for uniform hardness and adequate case depth. They are checked thoroughly for high spots because this ensures premature failure and noise-free operation. The crown wheel & pinion are paired and checked for centralized tooth bearing and desired proximity. An elliptoid contact pattern is ensured between the crown wheel and pinion. In a machine, when any torque is applied to the drive unit, the tendency is for the crown wheel and pinion to be forced into or out of mesh by the sliding contact. The amount of pre-load on the bearings determines how much torque can be transmitted without allowing end float, which cause the meshing of the gears to become incorrect. Application Crown wheel & pinion are used widely in automotive industries. They are one of the most stress prone parts of a vehicle. They are used in automobiles to maintain forward motion. To maintain forward motion both output drive shaft sides covers are removed and the pinion and crown wheel are swapped completely with different