Matlab assignment.

The objectives of this project are (1) to introduce the students to scripting applied to solution of mechanical engineering problems and (2) to create a Matlab script that allows the computation of principal stresses and strains starting from a generic state of stress and that automates the drawing of 3D Mohr circles

Assignment

1) Read from input a stress tensor (3D);

2) For any state of 3D stress compute the principal stress values (σ1, σ2, σ3) with σ1 > σ2 > σ3;

3) Calculate the maximum shear stress (radius of the three circles);

4) Draws the correspondent Mohr circles;

5) Given the principal stresses (computed at point 2) use the Hooke’s law to calculate the correspondent principal strains;

6) Create a flowchart correspondent to this code (Points 1 to 5).

Fluid Mechanics:
The speed of shallow water waves in the ocean (e.g., seismic sea waves or tsunamis) depends only on the still water depth and the acceleration due to gravity. Derive an expression for wave speed.

Determine the friction factor, f if water at 71 °C is flowing at 9.1 m/s in 25.4 mm Schedule 40 steel pipe. Given, roughness, Ɛ = 4.57 X 10-5 m.

when engineers disagree with their employees they may engage in organizational disobedience. Describe three types of organizational disobedience (by contrary action,by nonparticipation, by protest.)

Find out about the nominal cruise altitudes of any three aircraft types (you can also give a range of values, and cite the references). When you do the flight performance analyses at those altitude, you will need to use the gravitational acceleration and in most cases the sea level value g0 is used. Let us know what you think about that.

Topic: DCS

What is the difference between DCS Network Communication Protocol and Field Communication Protocol?

1- Comment on the effects of changing the position of G on the position of

metacentre.

2- Explain how unstable equilibrium might be achieved?

(Fluid Subject)

a)Using MIL STD 105E, find the sample size for inspection level III, normal inspection, AQL = 1.5%, and lot size of 1000. Determine the sample size.

b)For inspection level I, tightened inspection, AQL = 6.5%, and lot size = 500, find the sample size using MIL STD 105E.

Please discuss 4 major regions for phase change heat transfer

Answer the following questions:

a) In a wall without heat generation, with temperatures T0 and T1, if the heat in T0 is adiabatic, what phenomena can occur at the end of the wall?

b) What are the conditions for Despicable Convective Resistance and negligible Conductivity?

c) In what case, can they be considered as concentrated or finned parameters?

A cylinder with a 20 inch stroke and a 4:3 area ratio with a bore of 6 inch diameter takes 4 seconds to extend. What is the flow required for extention?

1- What is the continuum assumption? Why do we make this assumption in fluid mechanics?

2-Describe Newtonian and non- Newtonian fluids and give examples?

3-Define Mach number, and describe compressible and incompressible flows?

For an alloy that consists of 74.9 g copper, 108.0 g zinc, and 7.3 g lead, what are the concentrations of (a) Cu, (b) Zn, and (c) Pb in weight percent? The atomic weights of Cu, Zn, and Pb are 63.54, 65.39, and 207.2 g/mol, respectively.

Air undergoes a polytropic process in a piston–cylinder assembly from p₁ = 1 bar, T₁ = 295 K to p₂ = 3 bar. The air is modeled as an ideal gas and kinetic and potential energy effects are negligible.
For a polytropic exponent of 1.2, determine the work and heat transfer, each in kJ per kg of air,
(1) assuming constant c_v evaluated at 300 K.
(2) assuming variable specific heats.