Lafayette School Corporation [LSC] WEEK 11 Design Review

1. Lafayette School Corporation[LSC]WEEK 11 Design Review Michael Chung Salman Butt Rail Shafigulin Prabhjot Kaur Yasufumi Yamazaki

18. Pendulum ProjectPrabhjot Kaur (Project Leader)Rail ShafigulinSalman Butt

19. Goal and Objective Goal: Educate and motivate the high school students about the concepts applied in physics. Objective: Construct a pendulum to demonstrate the effect of changes in length and mass of the pendulum on its time period i.e. (Small angle approximation) These concepts are part of a Physics or Integrated Chemistry-Physics curriculum, (for 10 � 12 grade students)These concepts are part of a Physics or Integrated Chemistry-Physics curriculum, (for 10 � 12 grade students)

20. Work Done This Semester Mechanical Design of the Frame Materials to be used for the pendulum Electrical Decided to use a Reed switch We came up with the design of the pendulum frame after discussions with Prof. King, taking into account all the customer specifications. The frame was designed such that it is as portable as possible and fits into 1 meter cube of space, as desired by Mrs. Debbie Beck. Also, decisions were made regarding the materials that could be used for the pendulum itself, while keeping the customer specifications and safety precautions in mind. After discussion with Prof. King, we decided that we would switch over to a reed witch, since it serves our purpose very well.We came up with the design of the pendulum frame after discussions with Prof. King, taking into account all the customer specifications. The frame was designed such that it is as portable as possible and fits into 1 meter cube of space, as desired by Mrs. Debbie Beck. Also, decisions were made regarding the materials that could be used for the pendulum itself, while keeping the customer specifications and safety precautions in mind. After discussion with Prof. King, we decided that we would switch over to a reed witch, since it serves our purpose very well.

21. Design Mechanical: the shape of the frame. Materials to be used for the rod, bob, frame. Size of the frame, rod, bob. After meeting w\ Prof. King we briefly discussed what materials are to be used: rod � aluminum with threads, bob � plastic, reflector � brass or plastic, weights � brass, bolt � haven�t decided Electrical: Freezing interfaces � how to connect electrical component to the mechanical. How to connect electrical part so that the pendulum would actually swing. We are going to focus on the Mechanical component for some time because we can�t Freeze the interfaces until we have it done.Mechanical: the shape of the frame. Materials to be used for the rod, bob, frame. Size of the frame, rod, bob. After meeting w\ Prof. King we briefly discussed what materials are to be used: rod � aluminum with threads, bob � plastic, reflector � brass or plastic, weights � brass, bolt � haven�t decided Electrical: Freezing interfaces � how to connect electrical component to the mechanical. How to connect electrical part so that the pendulum would actually swing. We are going to focus on the Mechanical component for some time because we can�t Freeze the interfaces until we have it done.

22. Materials Pendulum shaft � aluminum - Aluminum arrow - 33� long, 23/100th� diameter Shaft to hold weights - aluminum shaft with threads Bob � plastic - Shift Knob - diameter varying from 5/16� to 8/16� Weights � steel washers Suspension Spring I and Rail went to Wal-Mart this Monday and found out the materials that we could use for the pendulum. For the shaft, we are going to use the aluminum, and for this we found an arrow (bow and arrow) that solved our purpose. This arrow is 30� long i.e 3/4ths of a meter. And the same thing can be used for the shaft that we require to hold the weights. For the bob, right here, we found a Flint river, Bullet starter. It was a sphere with a cylindrical shaft of about 3-4 inches long attached to it. Or we could use a golf ball, but I m not sure if we could drill through it and that it is too small � We are going to use brass washers, since we don�t want them to be attracted to the solenoid. And we are going to use Target puts (bullet packet) as a ferromagnetic materials. Since our shaft has threads in it. The bullet fits properly at the lower end of the shaft and can be used. I and Rail went to Wal-Mart this Monday and found out the materials that we could use for the pendulum. For the shaft, we are going to use the aluminum, and for this we found an arrow (bow and arrow) that solved our purpose. This arrow is 30� long i.e 3/4ths of a meter. And the same thing can be used for the shaft that we require to hold the weights. For the bob, right here, we found a Flint river, Bullet starter. It was a sphere with a cylindrical shaft of about 3-4 inches long attached to it. Or we could use a golf ball, but I m not sure if we could drill through it and that it is too small � We are going to use brass washers, since we don�t want them to be attracted to the solenoid. And we are going to use Target puts (bullet packet) as a ferromagnetic materials. Since our shaft has threads in it. The bullet fits properly at the lower end of the shaft and can be used.

23. Electrical Reed switch - consists of two magnetic contacts in a glass tube filled with protective gas. When a magnet comes close to a reed switch the two contacts become magnetized and attracted to each other allowing an electrical current to pass through. When the magnet is moved away from the reed switch the contacts demagnetize, separate, and move to their original position When a magnet comes close to a reed switch the two contacts become magnetized and attracted to each other allowing an electrical current to pass through. When the magnet is moved away from the reed switch the contacts demagnetize, separate, and move to their original position

25. Conclusion Send the final draft of the frame to Women�s Prison Buy components of the pendulum Test the circuit for the pendulum Build the pendulum The project might not be completed by the end of the semester

27. Motorized Cart Project Michael Chung Yasufumi Yamazaki

28. Problem Identification Students with physical disabilities have a difficult time coordinating their bodies They are not able to use the regular physical education classroom 4-wheel carts due to their inability to coordinate their feet Mrs. Angela Sutton teaches a class of physically challenged students at Amelia Earhart Elementary School A motorized cart is needed to assist the students in maneuvering around the wooden gym floor in a similar fashion to the 1� x 1� 4-wheel cart

29. Project Goal and Objective Goal: Design a device to assist students with disabilities during physical education classes Objective: Design and construct a motorized cart that allows students to maneuver safely on their own.

30. Current Status Spring 2005 Problem Identification Phase Deliverable: Project Charter Specification Development Phase Deliverable: Project Specification Document Conceptual Design Phase Functional Decomposition of project Battery Research 12 V SLA (Sealed Lead Acid) Battery

31. Current Status Fall 2005 Conceptual Design Phase Complete Functional Decomposition Motor Specifications Research Maneuvering Capabilities Research (Throttles) Emergency Stop Research Materials Research Wheels Research Deliverable: Project Conceptual Design Report Detailed Design Phase Deliverables: Project Detailed Design Report, Prototype Version of the Project Production Phase Deliverables: Delivered Project, Project Delivery Report, Delivery Checklist, User Manuals

32. Motor Research Maxy electronic Scooter Motor: www.unitemotor.com Model = MY6812 24 VDC 100W

33. Motor Research Torque Needed: 0.62 N*m Motor Specification: Torque = 0.35 N*m Power = 100 W Rotate Speed = 2900rpm Voltage = 12 V or 24 V Same specs for Torque, Power, Rotate Speed Weight = 10.75 kg

34. Motor Research Calculation: From Specification on the motor: - Rotate Speed of motor (Wm)= 2900 rpm - Gear Ratio = 5 : 1 (100 teeth for wheel, 20 teeth for motor) - Rotate speed of wheel (Ww) = 2900rpm * (1/5) = 580 rev/min Average Walking speed (V) = 1.3807 m/s Radius of Wheel (r) = 0.025 m - Angular Velocity of Wheel (Ww1)= V / r = 55.228 rad/s - Ww1=55.223 rad/s * rev/2pi rad = 8.789 rev/s - Ww1= 8.789 rev/s * 60 s/min = 527.388 rev/min Since Ww1 (angular speed needed) is less than Ww (motor angular speed), this motor is sufficient for this project.

35. Motor Research

36. Motor Research Place to buy this motor: http://www.oatleyelectronics.com Price: $32 (AUD) $24.07 (US) Shipping Price: Weight = 20 kg Air Mail = $44.50 Economy Air = $36.50 Sea Mail = $28.50 Total Price: ~ $92.64 (maximum with Air Mail)

37. Maneuvering Capabilities Research Joystick Physical input => Electrical output Specialized electrical switch Stick attached to a plastic base Base houses a circuit board that consists of several printed wires which connect to contact terminals Printed wires form a simple electrical switch

38. Pushing the stick forward closes the �forward switch� Pushing the stick backwards closes the �backwards switch� Joystick processes movement as absolute values instead of slight movements There is only one value for �forward�

39. Maneuvering Capabilities Research www.arcade-equipment.com 2 way micro switch joystick $22

40. ON-ON SPDT This switch can be on in both positions, switching on a separate device in each case. It is often called a changeover switch. For example, a SPDT switch can be used to switch on a red lamp in one position and a green lamp in the other position. ON-OFF-ONSPDT Center Off A special version of the standard SPDT switch. It has a third switching position in the centre which is off. Momentary (ON)-OFF-(ON) versions are also available where the switch returns to the central off position when released.

41. H-bridge Circuit

42. Emergency-Stop Function Garage door opener a small radio transmitter pushing the button turns on the transmitter and sends a code to the receiver (garage door) Inside the garage A radio receiver tuned to the frequency that the transmitter is using

43. Current Direction of the Project The motorized cart project team will continue working on the tasks involved with the conceptual design phase Functional decomposition of the cart Emergency-stop function Materials research (base frame of cart) Wheels research

44. Rough Draft of Motorized Cart

45. Project Timeline

46. Thank You for Your Time!!! Questions?