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WEEK 10

CALCULATION METHOD BEFORE PURCHASING ACTUATOR MOTOR

For this week, like as mentioned from previous week which I need to make a calculation on the length of the linear actuator motor. The purpose of this calculation is to determine the suitable length of the linear actuator motor as the actuator motor has several type of length and stroke length. So this is when the  used wheelchair play a role as the reference for us to find the suitable length of the linear actuator motor. 

For the calculation method, Pythagoras Theorem is use to calculate the length of the maximum tilt of the linear motor that will be attached at the wheelchair. The process of the calculation start with taking the length of the wheelchair’s seat and determine the minimum and maximum tilting of the seat then the calculation method begin.

 The calculation is perform as below:

Upper view of the wheelchair seat that had been calculated

The wheelchair seat is calculated and the full length of the wheelchair’s seat is 40 cm. To place the linear actuator motor, only half of the wheelchair’s seat is required for next calculation process.

The maximum and minimum angle for the seat to tilt

This tilt angle is determined before proceed to buy the linear actuator motor which will be placed under the wheelchair’s seat. The minimum angle that has been determined for the tilting is 10° while for the maximum tilting angle is 35°.

Concept before applying the calculation

 

Pythagoras Theorem Triangle

Which were:

a = Half length of the seat

h = Half length of the seat

x = Maximum tilt of the seat

The Formulae used to find the maximum tilt of the seat, x is calculated using Pythagoras’s Theorem formula.

The value of maximum tilt of the seat would be 11.47cm, which then converted into inch to get 4.5 inch. This calculation used to determine for the length of the linear actuator motor, which has the maximum stroke length up to 10 inch.  While the full length of the linear actuator motor is 6 inch (15.24cm) to assemble with the wheelchair. 

So the selected length of linear actuator motor is 6" linear actuator motor which is the most suitable length to assemble with the wheelchair.

Next task that has given to me for next week:

1) Buy the 6" linear actuator motor 

2) Update on my FYP proposal Chapter 2 and Chapter 3