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Designing a brake system for a car
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BRAKE SYSTEMPRESENTATION
Presention by:
Muhammad ashrafAhMAD ALMADANINUR ATIRAMD NASRUDDIN
PHASE IN DESIGNING A BRAKE SYSTEM
PHASE 1 CONCEPTUAL DESIGN
PHASE 2 EMBODIMENT DESIGN
PHASE 3 DETAIL DESIGN
PHASE ONE
• BACKGROUND OF THE STUDY
• PROBLEM STATEMENT• OBJECTIVE• SCOPE OF THE PROJECT• SIGNIFICANT OF THE
PROJECT
IDENTIFY PROBLEM
• QUESTIONNAIREGATHER
INFORMATION
• FUNCTIONAL DECOMPOSITION• CONCEPT SKETCHES• MORPHLOGICAL CHART
CONCEPT GENERATION
• PUGH CONCEPT• DECISION MATRIX EVALUATION
CONCEPT EVALUATION
PH
AS
E O
NE
IDENTIFY PROBLEM(A) BACKGROUND OF THE PROJECT
Single Seater Vehicle
Usually built for racing purpose
Made up of 7 main system :1. Chassis2. Bodywork3. Safety4. Brake system5. Suspension6. Powertrain7. Steering
WOODEN BLOCK AND LEVER SYSTEM
DRUM BRAKE
HYDRAULIC BRAKE SYSTEM
IDENTIFY PROBLEM(A) BACKGROUND OF THE PROJECT
Early invention of
the brake system
IDENTIFY PROBLEM(B) PROBLEM STSTEMENT
Determine the most compatible type of braking system for the single seater
vehicle.
Determine the ability and performance of the brake system to brake within a specified time,
speed and distance frame.
IDENTIFY PROBLEM(C) OBJECTIVE
To determine the most compatible type of braking system for the single seater vehicle
To determine the ability and performance of the brake system to brake within a specified time,
speed and distance frame.
IDENTIFY PROBLEM(D) SCOPE OF THE PROJECT
Vehicle must be equipped at least one (single) independently activated braking system
The system must comprise of a single command control (pedal), command transmission (cables/hoses/lines) and activators (calipers)
The installment of the single braking system must be applied on the rear axle
The vehicle must also install a read brake light with 15 watts or more that can be seen clearly from the rear and be mounted between the wheel centerline and driver’s shoulder level vertically and approximately on vehicle centerline laterally
IDENTIFY PROBLEM(E) SIGNIFICANCE OF THE PROECT
Safety Comfort
Medium Integrate
GATHER INFORMATION
Book
Journal
ArticleQuestionnaire
Educational Video -
YouTube
QUESTIONSSCORE
Disagree Moderate Agree
1) Do u think the size and shape of the brake pedal affects your overall driving experience?2) Does placing the ergonomic brake pedal beside the throttle pedal ensures smoothness when brake is applied?3) Does applying a small or necessary amount of force on the brake pedal is the most practical way to stop (braking) ?4)Do u agree that the brake effectiveness is the most important criteria in a car? 5)Would u choose a brake system that is maintenance friendly and of less hassle to the user which bear more cost ?
6) Does the performance of the car depend on the type of brake used?
7) Are you willing to spend an appropriate sum amount of money to ensure that your car is equipped with a good braking system?
8) Is the rear brake lamp is an important aspect of any car’s braking system?
9) Does the position of the rear brake lamp affect other drivers?10) Do you think that the bright and clear brake lamp is the most important aspect in terms of safety of the car for others to see?
GATHER INFORMATION
Disagree Moderate Agree02468
10121416
0
4
16
Do you agree that the brake effectiveness is the most important criteria in a car?
Question 4
Score
Num
ber o
f Res
pond
ents
GATHER INFORMATION
Disagree Moderate Agree02468
10121416
13
16
Would you choose a brake system that is maintenance friendly and of less hassle to the user
which bear more cost ?
Question 5
Score
Num
ber o
f Res
pond
ents
GATHER INFORMATION
CONCEPT GENERATIONFU
NC
TIO
NA
L D
ECO
MPO
SITI
ON
CONCEPT GENERATION
CONCEPT GENERATIONBRAINSTORMING SKETCHES
CO
NC
EPT
1
CO
NC
EPT
2CONCEPT GENERATION
CO
NC
EPT
3CONCEPT GENERATION
Function Sub- solution
CONCEPT 1 CONCEPT 2 CONCEPT 3
1.Type of braking system
Disc Brake and Drum Break. Drum Brake Disc Brake.
2. Location of braking system
Rear :Drum Brake
Front : Disc Brake Rear Rear
3. Braking operation system Hydraulic system Cable system Hydraulic system
4.Cost Most expensive Cheap Moderate
5. Brake system effectiveness
Effective for high speed.
Effective for low to moderate
Effective for moderate to high.
6. Maintenance. Moderate to high reliability. High reliability. Moderate to high
reliability.
CONCEPT GENERATIONM
OR
PHO
LOG
ICA
L C
HA
RT
CONCEPT EVALUATIONPugh Chart Comparison Criteria and Values
Criteria CONCEPT 1 CONCEPT 2 CONCEPT 3
User Experience Most effective braking system.
Does not significantly change user experience
Effective braking system
Manufacturability Uses a mix of numerous and complex components
Has many or complex components
Uses fewer components
Safety The highest safety performance of the brake system.
The least safety performance of the brake system.
A moderate safety performance of the brake system.
Need/Market Widely used Used preferably for rear braking of a vehicle’s system
Used preferably for front braking of a vehicle’s system
Reliability Depends on the usage, as it is a mixture of both drum and disc
If appropriate usage, can withstand wear and tear. But doesn’t perform well under harsh braking conditions
A moderate amount of wear & tear period, but can withstand harsh braking conditions
Life High to moderate lifespan High lifespan Moderate lifespan.
Cost High Prototyping or Consumer cost
Low Prototyping and Consumer cost
Moderate Prototyping and Consumer cost
PUG
H C
HA
RT
DESCRIPTION Concept 1 Concept 2 Concept 3
CRITERIA WEIGHT DESIGN 1 DESIGN 2 DESIGN 3
User Experience 4 ++ + ++
Manufacturability 5 + + +
Safety 3 ++ 0 +
Need/Market 3 ++ + +
Reliability 3 ++ + +
Life 5 0 + 0
Maintenance Cost 3 - - 0
Manufacturing Cost
4 - + +
+ 28 28 26
0 0 0 0
- 0 3 0
NET SCORE 21 25 26
CONCEPT EVALUATIOND
ECIS
ION
MAT
RIX
PHASE TWO
Product Architecture
Product Architecture
• Brake Disc• Brake Calliper• Pedal• Master Cylinder• Switch• Wire• Brake Hose• Brake Lamp
Design For Human Factor
• The brake pedal (lever) should have an angle of 45 degrees.
• When the brake pedal is pushed, it should displace about another 15 degrees with a total of 60 degrees overall.
• To avoid an injury angle between 0 and 30 degrees.
• Thus the range of angle should be between 30 and 60 degrees
Modelling
Modelling of the brake disc and calliper
Modelling
Exploded view of the brake disc and calliper
Modelling
Exploded view of the brake disc and calliper
Dimensions
SIMULATION & ANALYSIS
Deformation
Von Mises Stress
Translational Displacement
Principal Stress
DETAIL CALCULATIONDeceleration rate:Assuming that the vehicle is moving at 50 km/h(13.89 m/s) and it will
be eventually in stationary in 3 seconds therefore it deceleration rate will be:
V0 = 13.89m/sV1 = 0 m/st = 3sa= = = -4.63 m/s The negative shows the deceleration.
Stopping distance:So now we are going to find the stopping distance,which could be find by using formula
which is:ds = ds= stopping distace(m)v = velocity(m/s) =Coefficient of frictiong = gravitational acceleration (m/)by taking the coefficient of friction for dry road, =0.8 Stopping distance, ds =
= = 12.29 m
Braking time:To calculate braking time we will use this formula which isStopping time, ts = bear in mind that the stopping distance and deceleration rate have
been calculated in the previous section,therefore: =
= 2.65 seconds
Total braking distance:To determine the total braking distance,we will use the formula as follows:total braking distance = dr + db
dr here means reaction distance which the driver needs to apply the braking force,this parameter influenced by the reaction time which can be vary with many factors such as the age of the driver,distraction during drive,condition of the road,the tendency to become very panic and etc,therefore we take the average value because it seems impossible to find the exact value for the reaction time,we take the value of treaction as 1.5 seconds, hence:
Reaction distance: dr = (1.5 s) (13.89 m/s ) =20.835 m While db here tell us the braking distance which could be find as follows:Braking distance: db = 1/2 (V0)(ts) = 1/2(13.89 )(2.65) =18.404 m Hence our total braking distance will be:total braking distance = dr + db
=20.835 m + 14.05 m =34.885 m
Braking force:We can find the braking force by using the formula as follows:F=maF=force or in this case it should be braking force (kgm/)M=total mass (kg)a = acceleration (m/)From the requirement of this project or we called it as product design specifications,we
know that mass of the vehicle is 100 kg,and the driver’s mass is 70 kg.Therefore the total mass will be:
Total mass(kg)= mass of vehicle + driver’s mass =150 kg + 53 kg = 203 kg Therefore:F=ma =(203 ) (4.63 ) =939.89 N
Disc Effective Radius,
The effective radius of a brake disc is calculated to find the centre of the brake pads by area. After several discussion we have decided to use inside diameter of Di = 124mm and outside diameter of D0 = 248mm. So to calculate disc effective radius we will use formula as follows:Disc effective radius, re =
= = 93mm = 0.09 m
Brake Torque:Brake torque is the moment of braking force about the center of rotation.Which
could be calculated as follows:T= F. re
Where:
T=Brake torque (N/m)F=Braking force (N)re= Disc effective radius(m)
Thus,
T= (939.89 N)( 0.093) =87.41 N.m
Clamp Load:Clamp load is defined as force required by the calipers to stopped the brake
disc and eventually stopped the vehicle.To determine the clamp load we will use formula as follows:
Clamp load, C =
Disc effective radius,re = 0.093 mCoefficient of friction for steel alloy, µf = 0.4Friction surface contact since friction act on the 2 points in our brake disc , n = 2 Torque produce by the wheel,T = 87.41 N.m Clamp load, C =
=
= 1174.87 N
Average Stopping Tablespeed average braking distance average driver perception-reaction time(1.5seconds) Total Stopping Distance
mph kmh feet meter feet meter feet meter
10 16.67 5 1.524 22 67.056 27 68.58
15 25.005 11 3.3528 33 100.584 44 103.9368
20 33.34 19 5.7912 44 134.112 63 139.9032
25 41.675 30 9.144 55 167.64 85 176.784
30 50.01 43 13.1064 66 201.168 109 214.2744
35 58.345 58 17.6784 77 234.696 135 252.3744
40 66.68 76 23.1648 88 268.224 164 291.3888
45 75.015 96 29.2608 99 301.752 195 331.0128
50 83.35 119 36.2712 110 335.28 229 371.5512
55 91.685 144 43.8912 121 368.808 265 412.6992
60 100.02 171 52.1208 132 402.336 303 454.4568
65 108.355 201 61.2648 143 435.864 344 497.1288
70 116.69 233 71.0184 154 469.392 387 540.4104
75 125.025 268 81.6864 165 502.92 433 584.6064
MATERIAL SELECTION
ASBESTOS
ORGANIC
SEMI-METALLIC
CERAMIC
SINTERED-METAL
BRAKE PADS
CERAMIC COMPOSITE
BRAKE DISCCARBON
CAST IRON
ALUMINUM
DESIGN FOR MANUFACTURING
BRAKE PADS
1• THE BACK PLATE IS
STAMPED DESIGNED TO FIT VEHICLE CALIPER
2• THE SURFACE IS TO BE
ROUGHEN TO INCREASED CONTACT SURFACE AREA FOR ADHESION
3• ADHENSION IS APPLIED TO
THE BACK PLATE, READY TO BOND WITH FRICTION METAL (PADS)
BACKING PLATE
MAIN PROCESS
1• THE FORMULA OF THE RAW
MATERIAL IS GATHERED
2• THE RAW MATERIAL BLENDED
TOGETHER TO GIVE OUT FINE PARTICLES
3• THE BLENDED MATERIAL GET
MOLDED INTO BRICK SHAPED UNDER HIGH PRESSURE AND TEMPERATURE
4• THE BRICK SHAPED FRICTION
METAL UNDERGOES BONDING WITH BACKING PLATE
5• THE ASSEMBLE PART IS PUT
UNDER CONSTANT HEATING TO ENSURE EVERLAST JOINING
6• THE ASSEMBLE IS PAINTED FOR
PROTECTION OF OXIDATION AND AESTHATHIC VALUE
7• THE PARTS UNDERGOES LATHE
MACHINING FOR GROOVING, CHAMFERING AND GRINDING
8• THE PARTS IS BRANDED TO
ENSURE THOSE ARE FIT TO THE CORRECT TYPE OF CAR
9
• THE SENSOR IS RIVETED TO INFORM THE DRIVERS AT WHAT MOMENT CAN THEY CHANGE THE PADS
10• THE BRAKE PADS MUST BE
INSPECTED TO ENSURE THE QUALITY OF ASSEMBLY
11• THE BRAKE PADS ARE PACKED
FOR SAFE KEEPING, TRANSPORTATION AND SALES
12
• EXCESSIVE PRODUCED BRAKE PADS ARE STORED IN WAREHOUSE FOR FURTHER ORDER AND SAFEKEEPING
BRAKE DISC
RAW MATERIAL TURNED INTO MOLTEN METAL
MOLTEN METAL UNDERGOES DIE CASTING PROCESS
THE PRODUCT IS THEN UNDERGOES SECONDARY PROCESS
EACH PRODUCED DISC IS INSPECTED TO ENSURE ITS QUALITY
THE DISC IS PACKAGED FOR TRANSPORTATION, SALES OR STORAGE
DESIGN FOR ASSEMBLY
PARTS OF BRAKES
INSERTION AND FASTENING
DESIGN FOR ROBUSTNESS
BRAKE HOSE
FAILURE MODE AND EFFECT ANALYSIS
ITEM FAILURE MODE
FAILURE
CAUSES
CURRENT
CONTROL
ACTION RECOMMENDE
D
ACTIONS
TAKEN
PHASE THREE
Bill of Material
Part Name Material QuantityBrake Disc Grey cast iron 1
Brake Disc Mount Cast iron 1
Hexagonal Bolt Stainless Steel 4
Hexagonal Nut Stainless Steel 4
Washer Stainless Steel 8
BOM for Brake Disc Assembly
Bill of Material
Part Name Material QuantityCaliper Casing Cast aluminium 2
Brake Pad Ceramic 2
Screw Pin Stainless steel 2
Piston Stainless Steel 4
Octagonal-holed bolt Stainless Steel 2
Pad Support Stainless Steel 2
BOM for Brake Caliper Assembly
Bill of Material
Part Name Material QuantityPiston Stainless Steel 1
Buffer Stainless Steel 1
Connector Stainless steel 1
Pedal Stainless Steel 1
Reservoir Plastic 1
Master Cylinder Aluminium 1
Cap Plastic 1
Base Stainless Steel 1
Hub Stainless Steel 1
BOM for Brake Pedal Assembly
COSTItem Material Quantity Price Per
Unit (RM)Total Price
(RM)Brake Pads Ceramic (1pair) 90 90
Brake Disc Cast Iron 1 110 110
Cable Polyurethane 3 meter 6 18
Caliper Mount Stainless Steel 1 46 46
Master Cylinder
Aluminium 1 193 193
Caliper Aluminium 1 120 120
Brake Pedal Zinc Plated Stainless Steel
1 17 17
Brake Lamp - 1 29 29
Total Cost 623
THANK YOU