1. MODIFIED WHEELCHAIR
R
E
P
O
R
T
D
E
S
I
G
N

2. THE MAIN PURPOSE OF THIS DESIGN IS TO ASSIST DISABLED PEOPLE TO ALLOW THEM TO
MOVE FROM POINT (A) TO POINT (B) WITHOUT ASSISTANCE ON INCLINED AND UNEVEN
AREAS.
THESE AREAS INCLUDE :
 STAIRCASES
 STANDARD ESCALATORS
 ELEVATORS
 UNEVEN TERRAIN
 ROUGH TERRAIN

3. CONCEPT FORMATION
FINAL CONCEPT DESIGN:
MODIFIED WHEELCHAIR
CONCEPT ONE
CONCEPT TWO
FINAL CONCEPT

5. OVERALL WIDTH: 900MM
OVERALL LENGTH: 700MM
STEERING SYSTEM: RACK & PINION
BATTERY: 12V
BRAKES: ELECTRO-
MECHANICAL
SEAT TYPE: RECLINING LEATHER
MOTOR: 3KW @
1000RPM
DRIVETRAIN: GEAR-TRAIN
SUSPENSION: LINKAGE RODS
GRADE CLIMBABLE: 60 DEGREES
ACTUATING SYSTEM: LINEAR
MAX WEIGHT: 120KG

7. DRIVE TRAIN STEERING SYSTEM
RACK AND
PINION SYSTEM

8. BATTERY AND MOTOR
CHAIR AND ACTUATORS
 SUPPLIES POWER TO THE MOTOR
 POWER SOURCE FOR ACTUATORS
 CONTROL SOURCE FOR CONTROL UNIT
THE BATTERYS DUTIES

9. COST ANALYSIS

10. CALCULATIONS

11. 𝑭𝒐𝒓𝒄𝒆𝒔 ↑ = 𝑭𝒐𝒓𝒄𝒆𝒔 ↓
BY PRINCIPLE OF EQUILIBRIUM:
𝑵𝑹 + 𝑭 𝟏 + 𝑭 𝟐 = 𝑾𝑪𝑶𝑺𝜽
= 𝒎𝒈𝑪𝑶𝑺𝜽
𝑵𝑹 = 𝒎𝒈𝑪𝑶𝑺𝜽 − 𝑭 𝟏 𝑪𝑶𝑺𝜽 − 𝑭 𝟐 𝑪𝑶𝑺𝜽
𝑵𝑹 = 𝟎 ∴ 𝑺𝒀𝑺𝑻𝑬𝑴 𝑰𝑺 𝑰𝑵 𝑬𝑸
ANOTHER METHOD THAT CAN BE USED FOR ESTABLISHING BALANCE IN EQUILIBRIUM IS BY TAKING MOMENTS ABOUT
THE TOPPLING POINT WHICH IS THE REAR BOTTOM CORNER OF THE WHEELCHAIR. THE ANTI-CLOCKWISE AND
CLOCKWISE MOMENTS ABOUT THE TOPPLING POINT WILL BALANCE.
𝑭𝒐𝒓𝒄𝒆𝒔 → = 𝑭𝒐𝒓𝒄𝒆𝒔 ←
BY D’ALEMBERTS PRINCIPLE:
𝑭 𝑫𝑹𝑰𝑽𝑰𝑵𝑮 = 𝑾𝑺𝑰𝑵𝜽 + 𝑭𝒛 + 𝑭𝝁
= 𝒎𝒈𝑺𝑰𝑵𝜽 + 𝒎 𝒂 + 𝝁 (𝑵𝑹)
= 𝟏𝟐𝟎 × 𝟗. 𝟖𝟏 × 𝑺𝑰𝑵𝟔𝟎 + 𝟏𝟐𝟎 𝟑 + 𝟎
𝑭 𝑫𝑹𝑰𝑽𝑰𝑵𝑮 = 𝟏𝟑𝟕𝟗𝑵
𝑷 = 𝑻𝝎 = 𝑻
𝟐𝝅𝑵
𝟔𝟎
𝒘𝒉𝒆𝒓𝒆 𝑵 = 𝒓𝒑𝒎 𝒂𝒏𝒅 𝑷 = 𝒑𝒐𝒘𝒆𝒓
𝑻 =
𝑷
𝝎
=
𝟑𝟎𝟎𝟎 × 𝟔𝟎
𝟐𝝅 × 𝟏𝟎𝟎𝟎
𝑻 = 𝟐𝟖. 𝟔𝟒𝑵. 𝒎
THE FOLLOWING DESIGN WILL REQUIRE A 3KW MOTOR @ 1000RPM WITH A TORQUE OUTPUT OF 28.64N.M AND A DRIVING
FORCE OF 1.379KN IN ORDER TO OVERCOME ALL RESISTING OPPOSING FORCES.

12. FINAL
ANALYSIS
A PROTOTYPE
CAN BE BUILT
AND FURTHER
RESEARCH ON
THE DESIGN CAN
BE DONE
POTENTIAL TO BE
A FEASIBLE AND
GOOD DESIGN
MEETS THE
STANDARD
DESIGN CRITERIA

13. A
S
K
Q
U
E
S
T
I
O
N
S
N
O
W
A
S
K
Q
U
E
S
T
I
O
N
S
N
O
W