Answer:
Problem 1 (10 points) In the first homework you were instructed to design the mechanical components of an oscillating compact disc reader. Since you did such a good job in your design, the company decided to work with you in their latest Blue-ray readers, as well. However, this time the task is that once the user hits eject button, the motor that spins the disc slows down from 2000 rpm to 300 rpm and at 300 rpm a passive torsional spring-damper mechanism engages to decelerate and stop the disc. Here, your task is to design this spring-damper system such that the disc comes to rest without any oscillations. The rotational inertia of the disc (J) is 2.5 x 10-5kg m² and the torsional spring constant (k) is 5 × 10¬³NM. Calculate the critical damping coefficient cc for the system. choice of the damper, bear in mind that a good engineer stays at least a factor of In your 2 away from the danger zone (i.e., oscillations in this case). Use the Runge Kutta method to simulate the time dependent angular position of the disc, using the value of damping coefficient (c) that calculated. you Figure 1: Blue-ray disc and torsional spring-damper system.
Answer:
Take action. Try hard. Keep practicing. Explore a different way. Ask someone how to do it better. Do your best. Learn how others have done it. Build upon your strengths. Review and fix any mistakes. Don’t give up.
Hope this helped you!
Explanation:
Answer:
Option c)
Explanation:
a.The carbon content of eutectoid steel, which is an carbon- iron alloy, is in between 0.80-0.83%
b. In hypoeutectoid steel, the carbon composition is less than 0.80% and is approximately 0.76%
c. In hypereutectoid steel, the carbon composition ranges from 0.80% - 2.0%
d. In wrought iron, the iron composition is quite low about 0.08%
