vehicle body engineering unit1

8/13/2019 Vehicle Body Engineering Unit1

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CLASSIFICATION OF CARS

VEHILCE BODY ENGINEERING


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MANUFACTURING COSTS BY VEHICLE AREAS


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FOUR DOOR SALOON
http://en.wikipedia.org/wiki/File:2000LincolnTownCar.jpg


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SPORTS COUPE
http://en.wikipedia.org/wiki/File:Honda_NSX_red.jpg


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COUPE
http://en.wikipedia.org/wiki/File:Jaguar.xk8.car.750pix.jpg


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LIMOUSINE


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ESTATE CAR
http://en.wikipedia.org/wiki/File:Jeep-Commander.jpg


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Good positioning of the driver

Forward visibility increased by moving the driver closer to the wind screenDownward visibility which is important in military vehicle is increased bypositioning the driver as high as possible to the lower edge of wind screenVertical visibility should be such as to enable the driver to see traffic lights


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Reducing the blind areas :-Horizontal visibility -should be more than 90 % visible area.- Rear visibility improved by having fast back


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Eye position of average driverHorizontal 180Vertical - 750


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- Seat cushion angle - Back rest angle - Steering column angleP - Maximum force on pedalh - Seat cushion height


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IMPORTANCE OF AERODYNAMICS SAFETY DESIGN

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2

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FRONT AIR DAM

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Limits the Amount of Air Passing Underneath the Car Contributes to High Pressure In Front of the Car Causes Low Pressure Underneath the Car

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SIDE SKIRTS

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Side Skirts Prevent High Pressure Air Around the Car fromDisturbing the Low Pressure Underneath the Car

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CANARD VORTICES

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Vortices Spin Inwards, Towards the Vehicle on Each Side

Canard Vortices Work In Conjunction With Side Skirts to Limit the HighPressure Air From Mixing With the Low Pressure Air Found Underneath the Car

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VENTURI TUNNELS / REAR DIFFUSERS

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REAR DIFFUSER

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Expands Air Back Downto Road Velocity

Slows the Flow and Raisesthe Air Pressure

Acts as a Pump DrawingMore Air from the Undertray

Rear Wing Drives the

Diffuser Because of its Proximity to the Wing's Low Pressure Side

Reduce the Overall Pressure Drag on the Vehicle by Introducing HighPressure Air into the Low Pressure Wake Region

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EFFECT ON BLUFF BODIES

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With VG Without VG

Higher Velocities Closer to Car,Resulting in a Smaller Wake Behind Vehicle

VGs Cause Drag, but Reduce Pressure Drag byDelaying Flow Separation from OccurringReducing the Magnitude of the Separation Region

Increases the Static Pressure of Separation Region

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Vibration Analysis

Dynamic analysis helps is finding the followingvibration characteristics.Natural FrequenciesMode ShapesModal strain energyEffect of Mass

Amplitude and Phase angleEnergy distribution


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Crash testingCrash testing is the way to analyze how best avehicle can save the occupant during anUNDESIRABLE crash.


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Frontal Impact Test ModesFlat frontal impact test- vehicle travelinglongitudinally forward impacting on fixed rigid barrierwith 100% overlap.Offset deformable barrier test- vehicle impacting ondriver side,on a deformable barrier with 40% overlap.Angular impact- vehicle impacting on a fixed rigidbarrier at 30 deg front the line perpendicular to line oftravel on either side of the vehicle.


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Occupant protection systemVehicle CompartmentRestraint Systems

Seat Belts

Air BagsKnee Bolster

Collapsible Steering


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Frontal Crash Crush Zone

Engine room is normally packeddensely, leaving only limited spacefor front crush zone.

Rail design at the crush zone is finetuned to crush at the predefined F/Dcharacteristics.Power train pack acts like a rigidblock.Often one body design is combinedwith different engine configurationtoo.


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Rear Crash Load Path


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Typical Side Door Intrusion Test


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CAR BODY CONSTRUCTION


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vehicle body engineering unit1

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