3. (30 points) A simple electrical switch in an aircraft panel (shown below in the OFF...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
3. (30 points) A simple electrical switch in an aircraft panel (shown below in the OFF position) consists of a rigid knob, a flexible shaft, and a rigid (electrically conductive) rocker arm. The flexible shaft has a diameter d, length L, and is made of a material with shear modulus G. The electrical circuit (not shown) is completed by rotating the knob clockwise (as viewed from the front), so that the rocker arm touches the electrical contacts. The shaft of the switch has been press-fit into a panel, and there exists some friction that resists its rotation. (Neglect the small gaps in the x-direction between the knob and rocker arm with the panel.) knob panel electrical contacts rocker. A arm shaft frictional surface b b cross-section back side isometric view (without panel) b A A (a) Assuming that friction causes a uniform distributed torque along the length of the shaft of magnitude to (with units of moment/length in the x-direction), find the torque on the knob necessary to overcome the frictional resistance in order to rotate the rocker arm. (Be sure to draw a free body diagram.) (b) Find the rotation of the knob for which the rocker arm just touches the electrical contacts. An initial gap (A) exists between the contacts and the ends of the rocker arm (assume A < < b). (c) Suppose that a minimum contact force, Fmin, is necessary to ensure a reliable electrical circuit. Find the corresponding minimum rotation of the knob Qmin. (Set up the equations and identify the unknowns, but do NOT solve.) 3. (30 points) A simple electrical switch in an aircraft panel (shown below in the OFF position) consists of a rigid knob, a flexible shaft, and a rigid (electrically conductive) rocker arm. The flexible shaft has a diameter d, length L, and is made of a material with shear modulus G. The electrical circuit (not shown) is completed by rotating the knob clockwise (as viewed from the front), so that the rocker arm touches the electrical contacts. The shaft of the switch has been press-fit into a panel, and there exists some friction that resists its rotation. (Neglect the small gaps in the x-direction between the knob and rocker arm with the panel.) knob panel electrical contacts rocker. A arm shaft frictional surface b b cross-section back side isometric view (without panel) b A A (a) Assuming that friction causes a uniform distributed torque along the length of the shaft of magnitude to (with units of moment/length in the x-direction), find the torque on the knob necessary to overcome the frictional resistance in order to rotate the rocker arm. (Be sure to draw a free body diagram.) (b) Find the rotation of the knob for which the rocker arm just touches the electrical contacts. An initial gap (A) exists between the contacts and the ends of the rocker arm (assume A < < b). (c) Suppose that a minimum contact force, Fmin, is necessary to ensure a reliable electrical circuit. Find the corresponding minimum rotation of the knob Qmin. (Set up the equations and identify the unknowns, but do NOT solve.)
Expert Answer:
Related Book For
Accounting for Decision Making and Control
ISBN: 978-0078025747
8th edition
Authors: Jerold Zimmerman
Posted Date:
Students also viewed these mechanical engineering questions
-
Describe two behaviors that the best supervisors you have seen exhibit to positively impact you. Additionally, what behaviors had a negative impact on you? Based on what you have learned, what would...
-
Q1. You have identified a market opportunity for home media players that would cater for older members of the population. Many older people have difficulty in understanding the operating principles...
-
Let A, B be sets. Define: (a) the Cartesian product (A B) (b) the set of relations R between A and B (c) the identity relation A on the set A [3 marks] Suppose S, T are relations between A and B, and...
-
Consider a long cylindrical solenoid with diameter R, number of current loops N and length L through which a current I runs. Now (a) Use Ampre's law to calculate the magnetic field inside the...
-
A small DNA molecule was cleaved with several dierent restriction nucleases, and the size of each fragment was determined by gel electrophoresis. The following data were obtained. Enzyme Fragment...
-
Cars arrive randomly at an intersection with an average traffic volume of one car per minute. The likelihood, or probability, that at least one car enters the intersection during a period of x...
-
Calculate the return on common stockholders' equity for Evans \& Sons for 2018 and 2019. Did the return improve from 2018 to 2019? Evans \& Sons, Inc., disclosed the following information in a recent...
-
The Sayers Company purchased a building for $250,000 on January 2, 2007. The building has an expected residual value of $20,000 at the end of its expected life of 20 years. Required Prepare a...
-
RFID @ Metro 1-What is your assessment of Metro's approach to implementing RFID 2-Evaluate the costs and benefits of RFID at the pallet and at the case level.
-
Below is the taxpayer information for Sharon and Robert Dolan. They have two children who lived with them, David ( SS# 1 5 4 - 1 3 - 5 8 2 6 ) , age 1 3 ( date of birth: October 1 1 , 2 0 1 0 ) ,...
-
Read the Nature View Case and answer the following question: What action plan should the company pursue? What changes in the current marketing mix, sales, brand, and channel partner arrangements do...
-
Driver error can be listed as the cause of approximately 54% of all fatal auto accidents, according to the American Automobile Association. Thirty randomly selected fatal accidents are examined, and...
-
According to the Center for Disease Control website, in 2011 at least 18% of high school students have smoked a cigarette. An Introduction to Statistics class in Davies County, KY conducted a...
-
A statistics instructor believes that fewer than 20% of Evergreen Valley College (EVC) students attended the opening night midnight showing of the latest Harry Potter movie. She surveys 84 of her...
-
A survey in the N.Y. Times Almanac finds the mean commute time (one way) is 25.4 minutes for the 15 largest US cities. The Austin, TX chamber of commerce feels that Austins commute time is less and...
-
The student academic group on a college campus claims that freshman students study at least 2.5 hours per day, on average. One Introduction to Statistics class was skeptical. The class took a random...
-
Mike wants to buy a new car three years from now. He expects that the price of a car will be P2 500 000 in three years. How much money should Mike put in his savings account now if a bank pays a 5%...
-
Subprime loans have higher loss rates than many other types of loans. Explain why lenders offer subprime loans. Describe the characteristics of the typical borrower in a subprime consumer loan.
-
The consistency principle stipulates that when a company begins using a given inventory valuation method (FIFO, LIFO, or the weighted-average cost method), the company should continue to use that...
-
How does an individual know if all cash transactions have been properly accounted for on the statement of cash flows?
-
How are the cash flows originating from a company's financing activities identified?
Study smarter with the SolutionInn App