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This paper attempts to analyze the formula modeling the motion of a freight elevator:

Extracts from this document...

Introduction

Thi Ngoc Hanh Nguyen

Introduction

This paper attempts to analyze the formula modeling the motion of a freight elevator:
image00.png

The formula above is then differentiated to obtain the velocity and acceleration equations. Based on the strengths and weaknesses of the original model, a new model is founded to fix all the problems of the original model while maintaining its strengths and usefulness. Later, the founded model is modified to fit into other applications such as residential elevators, pulleys and cranes.

1. Use these functions to:

a) Interpret the original vertical line motion simulation

image01.png

Graph 1image08.pngimage08.png

image26.png

Graph 2image35.pngimage35.png

image49.png

Graph 3image54.pngimage54.png


From the three graphs above, the motion of the freight elevator can be described as below.

From the graph of displacement versus time, the elevator starts moving from t=0 to t=1. It then speeds up from t = 1 to t = 4. It stopped at -80m below the ground at t = 4. From t = 4 to t = 6, the elevator moves back up to the ground.

From the graph of velocity versus time, the elevator speeds up at first from t = 0 to t = 2. From t = 2 and t = 4, the velocity slows down, comparing with the displacement graph, the elevator has slowed down when it comes near the shaft.

...read more.

Middle

3 and 4. To ensure the periodic phenomenon in the movement of the elevator, a trigonometry equation is employed. Explain how your model addresses the problems of the given model and satisfies the specifications of  a well-functioning elevator for a mining company.

The model has the general formula image05.pngimage05.png

The period is 6 minutes, so

image06.png
image07.png

image09.png
image10.png

The principal axis is the middle between the maximum and minimum values:

image11.png

image12.png

At t = 0, y(0) = 0                                  image13.pngimage13.png
image14.png
image15.png
image16.png

image17.png
image18.png
image19.png

image20.jpg

Table 2 Values of displacement (y), velocity (v) and acceleration (a) based on the new model formula

In the table values, using the same displacement distance (which is -80m), it can be seen the time for the elevator to come down to the mineshaft is equal to the time it takes for the elevator to come up to the ground. This is an improvement for the problems of the original model.  When the elevator comes near the shaft or the ground, the velocities are really small, nearly zero, which are -7.7 x 10-15 and 5.0 x 10-15. Fulfilling the specifications listed above, the elevator first speeds up and then slows down again when it comes to either the ground or the mine shaft. These problems can be seen on the graphs of displacement, velocity and acceleration.


image21.png

Graph 4image22.pngimage22.png

image23.png

Graph 5image24.pngimage24.png


image25.png

Graph 6image27.pngimage27.png

...read more.

Conclusion

image31.png

Table 3 Values of displacement (y), velocity (v) and acceleration of the refined version of the new model formula


image32.png

Graph 7image33.pngimage33.png

image34.png

Graph 8 image36.pngimage36.png


image37.png

Graph 9image38.pngimage38.png

4. Explain how your model may be modified to be useful in other situations

The model founded is to be applied upon the elevator for a mining company. This elevator moves into the underground, in other words, below the ground surface. Other situations may involve an object moving upwards such as an elevator in a hotel, a pulley, or a crane. Not taking the time spending at the maximum distance, the initial position or anything in the range, the formula can be applied to calculate the height, velocity and acceleration of the object.

The model has the general formula image05.pngimage05.png

The period is:

image39.png

image40.png

The principal axis is the middle between the maximum and minimum values:

image41.png

image42.png
image43.png

At t = 0, y(0) = 0

image44.png

image45.png
image46.png

Conclusion:

Some conclusions can be drawn upon the results obtained in this investigation. First, based on the displacement, velocity and acceleration graphs, the reliability and the practicality of a formula on how a model works.

The original model has the displacement equation, velocity equation and acceleration equation as shown below:

image00.png

image02.png

image04.png

To improve the weaknesses of the original model which include unrealistic and hazardous velocity as well as acceleration, a refined model has been made:

image47.png
image48.png
image50.png

The general formula for an object to have similar motions to the elevator is:

image05.png

Where
image51.png

image52.png

image46.png

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...read more.

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