The MOBOT Project: Longwood
In modern engineering, a systematic approach is used in the design, operation, and construction of an object to reach a desired goal. The first step of the process employs what is commonly known as the scientific method. The next step involves forming an interdisciplinary team of specialists from not only the various engineering disciplines, but from other fields whose knowledge may be useful or even necessary to completing the project. This step doesn't apply to our project, due the confined nature of the class. Finally, considerations must be taken into account to ensure that the project is efficient as well as cost effective.
The goal of the MOBOT Project was to design and build a programmable robot. The robot had to complete a series of four movements in four given directions over a distance of at least 6 inches. Power and weight restrictions were applied to ensure the safety of the students and, more importantly, the teacher. As the goals of the project were made clearer, our group began discussing possible ideas for the design. There were some disagreements about whether we should take the electromechanical route or the purely electrical one.
And after some deep thought, we all agreed that the mechanical way would be the simplest to build and the most merciful on our pocketbooks. Even though we were coming up with some good ideas, each design seemed to contain some major problems. One of the reoccurring problems dealt with the synchronization of the driver motor and the steering system. Finally the team came up with a design that allowed the drive and steering controls to be independent of one another, but still allowing each one to be linked in time. This design has now become what is known as LONGWOOD.
The Longwood is divided into two main parts: 1)motion system and 2)logic board. As the engineer, I was responsible for motion design. Therefore, that will be the focus for the remainder of this section.
The main components of the motion system consist of a platform, three wheels, a wheel frame, two motors, and two contact switches. Two of the wheels were connected to a motor and attached at the front end of the platform. These wheels were only allowed to move simultaneously in either a forward or reverse direction. The third wheel was hooked up to the wheel frame and free to rotate approximately 45 degrees in either direction. Figure 1.1 shows an illustration of how the wheel frame works. The wheel frame and third wheel were then attached to the platform completing the basic assembly.
o The secondary clutch is mounted on the end of the jackshaft (which connects to the drive shaft via a chain and gears).
deep need to probe the mysterious space between human thoughts and what is a machine can
Specifically, on a standard five speed, the gears are as follows: Neutral is located in the middle of the panel. From neutral, gears must be changed accordingly. First gear is found to the far upper left, and is used to get the car moving from a stopped position. Down left is second gear, used for speeds up to twenty-five miles per hour. Third gear is located upper middle of the panel, used for speeds from about twenty-five to forty miles per hour. Fourth gear is found at the lower middle and would be good for between forty and fifty miles per hour. Fifth gear is found to the far upper right, and is used for higher driving speeds such as on the freeway. Last but not least is reverse, which is to the far bottom right, used for backing up. These gears must be maneuvered the exact same way each time the automobile is driven.
A direct current in a set of windings creates a polar magnetic field. A torque acts on the rotor due to its relation to the external magnetic field. Just as the magnetic field of the rotor becomes fully aligned with the external magnetic field, the direction of the current in the windings on the armature reverses, thereby reversing the polarity of the rotor's electromagnetic field. A torque is once again exerted on the rotor, and it continues spinning.
Together, they are attached to one end then to a counterweight on the other. This arm is then hooked up with a tripod or any supporting device. This is like a seesaw when you see it, with the fulcrum located at the counterweight’s closer end. This gives the camera a wider range of motion.
The four wheel steering system is a relatively new technique to control the vehicle. In this system we can control the four wheels of the vehicle to make tighter turns and cornering in the space available in the industries. It makes the controlling of the vehicle easy and less time consuming. We can compare it with the AGVs used in industries to transport the goods and material to the workplace. The system is different from the AGV in terms of steering control and path decision. The steering control of the AGV is either front wheels or rear wheels. AGV works on the decided path and sometimes it takes time to move to the specific location. With the help of four wheel steering
Standing rigs are fixed lines, wires and rods used to support t sails. Shroud, spreader, forestay and backstay are types of standing rigs.
sideways just enough to be noticed. The one element that was utilized correctly was that the
D. They also used magnetic recording tape and solenoid coils that would trigger one another to produce action.
Tires are thrown from tires because the centrifugal force expels snow, rocks, and other foreign objects.
“Slowly, very slowly, like two unhurried compass needles, the feet turned towards the right; north, north-east, east, south-east, south, south-south-west; then paused, and, after a few seconds, turned as unhurriedly back towards the left. South-south-west, south, south-east, east.… “ (229)
The Wheel symbolizes the balance of life as it is all in constant motion. This balance is expressed through
delivering power instantly to the wheels. By providing high torque at low speeds, they give a feel
The most common style of drive train is that of the front wheel drive, abbreviated FWD. Front wheel drive was not, however, the first drive system. Front wheel drive first made its appearance in the automobile market in 1933 with the French Traction Avant, which literally means "pull from the front." At the time, the idea of having a car pulled by the front wheels was rather different, but this style of getting the power to the wheels worked rather well. What made the Traction Avant successful was that it was lighter and more fuel efficient than other car models made at the time. This increased efficiency was a result of not only eliminated weight, but also reduced power loss in moving the rotational energy to the back.