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Aerospace Engineering

Aerospace engineering is the discipline that is concerned with the research, design, development, construction, testing, science and technology of aircrafts. This type of engineering is divided into two subsections, aeronautical engineering an astronautical engineering. Aerospace engineering deals with the physical properties of aircrafts, rockets, flying craft and spacecraft’s and the science behind it. The field cover aerodynamic characteristics and behaviors of such objects.

Aircrafts are subject to demanding conditions that undergo extreme changes in atmospheric pressure and temperature. There are various technological and engineering disciplines that are required to consult on these objects that fall under the category of aerospace engineering.

The development and manufacturing of a modern flight vehicle is very complex. It demands careful balance and compromise between abilities, design, available technology and costs. Aerospace engineers design, test and supervise the manufacturing of aircraft, spacecraft’s and missiles. They develop new technologies for use in aviation, defence systems and space. 

Shaft misalignment, vibrational analysis type multiple choice

1. The rotational speed of a pump shaft is 19.5 Hz. The frequency spectrum of accelerometers placed on inboard and outboard bearings in the vertical direction generally indicate shaft imbalance at a frequency of A. 19.5 Hz. B. 39 Hz. C. 9.75 Hz. D. Always a sub-synchronous value of shaft speed. 2. A ceiling fan has

Intro to Maintainability DSP 3

TQ5 Indicate if the statement is true or false. If a statement is false, indicate the correct answer. 1. In vibration analysis, we often assume that an accelerometer signal is stationary. A stationary signal has the property that the statistical properties of the signal do not change with time. 2. The error due to unde

Solutions on bearings, gears maintainability problems

NOTE: Please see attachment for more clarification TQ4 1. A signal is sampled at 100 samples/sec. It was later found that the original signal contained a frequency component at 60 Hz. Calculate the frequency at which the aliasing effect is seen in the power spectrum in the frequency range [0 50] Hz. 2. The stiffness, k, of

Estimating nature of fault rate decreasing, increasing

A repairable diesel generator is monitored for 85 days. The following failure times are recorded: 2.3, 4.8, 8.1, 11.3, 17.3, 22.1, 31.3, 45.9, and 78.3. Do these times support a constant failure rate (α = 0.05)? if so, estimate the failure rate. If not, is the rate increasing or decreasing?

Fault Tree and Event Tree Analysis

Note: Please see attachment for more clarification. TQ3 1. For the fault tree given below, a. Find the minimum cut sets b. If the probability of each basic event is 0.10, what is the approximate top event probability? Using the minimum cut sets, what

Non Homogeneous Poisson Process, failure rates and analysis

NOTE: Please see attachment for more clarification TQ2 1. Suppose the failure time history of a component is given (where downward -facing arrows indicate failure times): a. Assume the failure process follows a NHPP with λ(t) = exp(α+βt). Estimate the model p

Reliability questions & solutions

Please see attachment for more clarification on Q5 1. Indicate whether the following statements are true or false. a) The time to failure of a component is distributed as follows (pdf): 1. Indicate whether the following statements are true or false. a) The time to failure of a component is distributed as follows (pdf

Reliability & MTTF for constant failure rate paralleled systems

Please see attachment for more clarification Q1. Which one of the following is the correct definition of equipment monitoring? a. Managing the day to day work using equipment maintenance procedures and work management systems. b. Managing the reliability of mechanical, electrical, process, and instrumentation equipment.

Reliability analysis and RBD

Please see attachment for more clarification for Q2 1. Find the minimum number of redundant components, each having a reliability of 0.4, necessary to achieve a system reliability 0.95. There is a common-mode failure probability of 0.03. 2. Determine the reliability of the system using Conditioning 3. Consider a c

System reliability clarifications

Please see attachment for more clarification on question 1 1. Find the system reliability from the figure below. 2. Consider a system of 6 pumps of which at least 4 must function properly for system success. Each pump has an 85% reliability for the mission duration. Determine reliability of the system. 3. Suppos

Serial and parallel connected failure components

1. Failure rate for item A is 0.002 failures/hr., item B is 0.0003 failures/hr. and item C is 0.001 failures/hr. The components are serially related with independent failure modes. What is the system reliability at 55 hrs? Please round your answer to 3 decimals. 2. A system has 2 components (component A and B) in parallel. Wh

Reliability maths problems and solutions

Hello Sir, In order to save time and effort. You don't need to provided a detail solution like you did on the last two questions. Please use the direct formula and provide a brief solution and answer. Thank you for all your assistance. 1. A component experiences failures at a constant rate (CFR) with an MTTF of 1100 hou

Reliability, failure analysis and problem solving

1. A Porsche GT3 Cup car's engine has a mean time between failures of 250 hours, where the failure rate is constant. Suppose that a certain race requires failure-free operation of the engine for 20 hours. What is the probability that the engine will complete the race without failure? Please round your answer to 2 decimals. 2.

Relaibility and Failure statisitcs and maths

Please see attachment for PDF functions in question 1 - 3 1. A manufacturing company produces many different products for wholesale distribution. Its flagship product, a reverse cylindrical dipolar tube, has a failure distribution given by the following PDF: f(t)= {█(0.000192t^2 0≤t≤25 years@0 els

Probability and Reliability

Q1. A smoke detector is routinely inspected. 80% of the detectors found inoperative had experienced a power surge, and 10% of those found in operating condition had experienced a power surge. 20% of the detectors inspected have failed. What is probability of a detector failing given it experiences a power surge? Q2. The time

4 Pillars of Safety Management System

List and explain the "4 Pillars" of SMS. List and explain the "4 Pillars" of SMS. Assess their value in creating a "proactive and predictive" safety program. Remember, you must have a title page, 300 word body written in 3rd person, and at least two references.

Steady flow air compressor

A steady flow air compressor compresses 50 lb/min from 14 psia and 80 degrees F to a discharge state at 45 psia and 300 degrees F. Heat departs from the air only via circulating water that enters the jacket at 75 degrees F and leaves at 95 degrees F, circulating at the rate of 15lb/min. Let the frictional losses external to th