دورات هندسية

 

 

شرح مفصل لسيارة خلايا الوقود من شركة شل

صفحة 1 من 2 12 الأخيرةالأخيرة
النتائج 1 إلى 10 من 14
  1. [1]
    حسن الطاهر
    حسن الطاهر غير متواجد حالياً

    عضو

    تاريخ التسجيل: Dec 2006
    المشاركات: 28
    Thumbs Up
    Received: 2
    Given: 0

    شرح مفصل لسيارة خلايا الوقود من شركة شل





    How does it work

    Whereas most of the other fuel economy vehicles burn fuel in an ICE (Internal Combustion Engine), PAC-Car II uses a fuel cell to convert hydrogen into electricity to power its electrics motors. The main advantages are greater efficiency, much more silent operation and most importantly, zero emission but pure water as the only by-product
    .


    Aerodynamics

    PAC-Car II is equipped with 3 wheels; the single rear wheel is powered and steered, and the front wheels have a camber angle of -8°.
    This solution allows the reduction of the frontal surface area because the room needed to steer the wheels is not needed. Some experiments on a test bench have shown that this camber angle does not provide too much rolling resistance.



    From then, 5 iterations, combining CFD and windtunnel tests have been performed to reach a Cd close to 0.09. The shape of PAC-Car II is optimized for air flow of up to 15° from the longitudinal axis

    .




    Lightweight Construction

    Reducing weight is a constant preoccupation because it affects the rolling resistance and the torque required for upward gradients.
    Body Shell

    PAC-Car II does not have a chassis as its body is self-supporting. FEM structure computations have allowed us to minimize the amount of material and to choose the best direction for the carbon fibre layers which form the shell of the car
    .
    Endplates

    In collaboration with our industrial partner Tribecraft AG we constructed new, ultralight endplates for the fuel cell stack.
    The 20 membranes of the fuel cell stack of PAC-Car II need to be pressed together with a force of more than three tons. This force needs to be evenly distributed over the whole area of the membranes. In PAC-Car I the stack was held together by long screws and Aluminium plates with a thickness of 30mm.
    The system of the new endplates is based on Tribecraft's D.bow patent. The PAC-Car II endplates use glass fiber belts to press the membranes together. Due to these belts the tension part of the D.bow is not needed anymore and the resulting "C.bow" Aluminium part is stressed only under compression.
    To apply the 1.7 tons on each belt (the belt is just 0.8mm thick and 20mm wide!) a newly invented construction with sledges (pulled together with a screw) has been added on top of the Aluminium bows:






    The new endplates weigh only 0.855 kg which is a weight reduction of 739% from the PAC-Car I endplates!




    Powertrain and Control
    The whole fuel cell system (including control and power electronics) has been designed at the ETH Zurich.
    The fuel cell, a by-product of the PowerPac project, is of the PEM type (Proton Exchange Membrane) and benefits from an embedded auto humidifying area specially designed by PSI. The stack efficiency is exceptional, close to 70%.
    All the fuel cell system auxiliaries have been chosen for their reliability, light weight and energy efficiency
    .
    PAC-Car II fuel cell system layout


    In accordance with the race regulations, some auxiliaries are powered by battery


    Control of the whole system is managed by a microcontroller main board
    .





    The transmission uses a gear pair. Its speed ratio depends on the track and on the target average speed. It can be “open” to reduce the drag torque, for instance when the vehicle is gliding downhill.



    The use of the powertrain is optimized by working backwards from a model based on measured efficiency maps of the fuel cell system and the motors, and on the track topography. The approach used requires simulation tools developed on Matlab Simulink


    Car manufacturing

    The manufacturing of the shell has been entrusted to the best specialist in Switzerland: Esoro. Other metallic or composite material parts have mainly been manufactured at the ETH





    اتمنى ان يعجبكم الموضوع
    واتمنى منكم التفاعل معنا
    ولاتنسونا من دعائكم بان يهدينا الله الى الخير

  2. [2]
    حسن الطاهر
    حسن الطاهر غير متواجد حالياً
    عضو


    تاريخ التسجيل: Dec 2006
    المشاركات: 28
    Thumbs Up
    Received: 2
    Given: 0
    لا اله الا الله محمد رسول الله

    0 Not allowed!



  3. [3]
    حسن الطاهر
    حسن الطاهر غير متواجد حالياً
    عضو


    تاريخ التسجيل: Dec 2006
    المشاركات: 28
    Thumbs Up
    Received: 2
    Given: 0
    اتمنى من الجميع اامشاركة بما لديهم من معلومات حول هذا الموضوع ذلك لما له من اهمية بالغة في المستقبل القريب

    0 Not allowed!



  4. [4]
    فرافيرو56
    فرافيرو56 غير متواجد حالياً
    جديد


    تاريخ التسجيل: Sep 2007
    المشاركات: 6
    Thumbs Up
    Received: 0
    Given: 0
    اكثر من رائع ، بل ممتاز جداً ، بارك الله فيك

    0 Not allowed!



  5. [5]
    حسن الطاهر
    حسن الطاهر غير متواجد حالياً
    عضو


    تاريخ التسجيل: Dec 2006
    المشاركات: 28
    Thumbs Up
    Received: 2
    Given: 0
    شكرا على المرور اخي الكريم

    0 Not allowed!



  6. [6]
    حسن الطاهر
    حسن الطاهر غير متواجد حالياً
    عضو


    تاريخ التسجيل: Dec 2006
    المشاركات: 28
    Thumbs Up
    Received: 2
    Given: 0
    كل عام والجميع بخير و

    0 Not allowed!



  7. [7]
    رعد الحجاج
    رعد الحجاج غير متواجد حالياً
    جديد


    تاريخ التسجيل: Sep 2009
    المشاركات: 1
    Thumbs Up
    Received: 0
    Given: 0
    مشكور احسنت وبارك الله فيك اخي الكريم نتمنى منك المزيد

    0 Not allowed!



  8. [8]
    حسن الطاهر
    حسن الطاهر غير متواجد حالياً
    عضو


    تاريخ التسجيل: Dec 2006
    المشاركات: 28
    Thumbs Up
    Received: 2
    Given: 0
    عفوا لكل المهندسين ولكي ادع الموضوع اكتر تشويقا
    هناك خطأ موجود في الشكل الذي يوضح PAC-Car II fuel cell system layout
    من يتمكن من معرفة هذا الخطأ بالتاكيد هو مهندس ميكانيكي ويمتلك فهم كامل لسيارات خلايا الوقود
    اتمنى منكم التفاعل مع الموضوع

    0 Not allowed!



  9. [9]
    حسن الطاهر
    حسن الطاهر غير متواجد حالياً
    عضو


    تاريخ التسجيل: Dec 2006
    المشاركات: 28
    Thumbs Up
    Received: 2
    Given: 0
    الحل موجود في هذا الكتاب
    http://www.4shared.com/file/132537975/60ce2884/625516.html

    0 Not allowed!



  10. [10]
    البورتسوداني
    البورتسوداني غير متواجد حالياً
    عضو فعال


    تاريخ التسجيل: Dec 2007
    المشاركات: 52
    Thumbs Up
    Received: 1
    Given: 0
    ما شاء الله مجهود مقدر
    و كل عام و انتم بخير

    0 Not allowed!



  
صفحة 1 من 2 12 الأخيرةالأخيرة
الكلمات الدلالية لهذا الموضوع

عرض سحابة الكلمة الدلالية

RSS RSS 2.0 XML MAP HTML