Materials Science
What are the frequently observed problems of using polymer materials in cars ?
In: Mechanical Engineering
What are designs/devices being used today for finger joint replacements (MCP) *include about 3 or more devices*
1. Description of each device (mechanics involved)
2.FDA class
3. Which current design is the most used today
Please include citations from the information obtained
Thank you
In: Mechanical Engineering
In: Mechanical Engineering
Discuss the steps in producing a clay-based ceramic from slip clay. Be specific and describe all steps and there effect on the micro-structure of the material - in particular why is the original material called slip clay.
In: Mechanical Engineering
In: Mechanical Engineering
An industrial gas turbine operates at an 8.8:1 pressure ratio
and a mass flow of 77 kg/s. The
exhaust temperature is at 437?C and the inlet temperature to the
machine is around 1000?C.
The machine is to be designed for a constant axial velocity of 200
m/s. (This data is based on
the Rolls-Royce Avon, an engine that dates from the 1950s but is
still used as low efficiency
high reliability engine for stationary power such as pipeline
pumping.)
For this gas turbine, draw to scale the meridional view with:
(a) a constant mean radius of 0.4 m.
(b) a constant outer diameter (to minimise cross sectional area) of
1.05 m.
In: Mechanical Engineering
Calculate the MRR in a drilling process that is done with a 2 1 4 - inches radius drill bit, in one piece whose drilling depth is H = 5 3 8 inches and it takes 1/2 hr. Keep in mind that the perforation is not through the workpiece and that the conical tip of the hole has a height of ½ inch.
In: Mechanical Engineering
An industrial gas turbine operates at an 8.8:1 pressure ratio
and a mass flow of 77 kg/s. The
exhaust temperature is at 437?C and the inlet temperature to the
machine is around 1000?C.
The machine is to be designed for a constant axial velocity of 200
m/s. (This data is based on
the Rolls-Royce Avon, an engine that dates from the 1950s but is
still used as low efficiency
high reliability engine for stationary power such as pipeline
pumping.)
For this gas turbine, draw to scale the meridional view with:
(a) a constant mean radius of 0.4 m.
(b) a constant outer diameter (to minimise cross sectional area) of
1.05 m.
In: Mechanical Engineering
Viscoelasticity and the non-linear rheology of polymers are responsible for phenomena such as rod climbing or die swell as well as part of the challenge of processing polymer melts. 1) explain why from a polymer physics point of view polymer melts can have non-Newtonian behaviors that do not scale linearly with molecular weight and 2) explain what one of these two examples are and posit an explanation for it.
In: Mechanical Engineering
1) A four-stroke diesel engine has a piston diameter of 16.5 cm and a stroke of 27 cm. The compression ratio is 14.3, the cut-off 4.23% of the stroke and the mean effective pressure 4.12 bar. The engine speed is 264 rev/min and the fuel consumption is 1.076 kg of oil per hour, having a calorific value of 39150 kJ/kg. Calculate the relative efficiency of the engine 2). A diesel engine has a brake thermal efficiency of 30%. If the calorific value of fuel used in 10000 kcal kg, calculate the brake specific fuel consumption
In: Mechanical Engineering
I am planning on purchasing a new Tractor, There are two machine choices, Tractor A and Tractor B. Tractor A will cost $175,000 and Tractor B will cost $275,000. Due to various uncertainties in manufacturing operations, the useful life of each machine is unknown, but the following probability estimates have been made.
|
Useful life (years) |
Probability |
|
|
Machine A |
Machine B |
|
|
15 |
0.15 |
0.25 |
|
25 |
0.25 |
0.45 |
|
35 |
0.45 |
0.20 |
|
45 |
0.15 |
0.10 |
A. Determine the expected life of each machine.
B. Based on the ratio of purchase cost to expected life, which machine would you recommend?
In: Mechanical Engineering
Spherical particle of silica of 0.1mm diameter falls in water filled in a glass cylinder of 40 mm internal diameter. Estimate the terminal settling velocity of single particle of silica. Also calculate the terminal settling velocity of silica particles when mass ratio of water to silica is 5.
.
In: Mechanical Engineering
Explain the procedures that can be used for tuning the PID controllers. Principles / Advantages / Disadvantages, etc.
In: Mechanical Engineering
Explain what a P, PI and PID controller are and present important features for these controllers.
Proportional
Integral
Derivative
In: Mechanical Engineering
•Research/investigate existing teaching models, procedures, and methods, etc. that used to demonstrate the concept of third angle projection to students/learners
. •Point out the limitation of the existing models, procedures or methods used. Alternatively critique the existing models and consequently list their shortcomings.
•Finally state how you hope to rectify some of the limitations you identified in the existing models above.
•Draw conclusions from your work
In: Mechanical Engineering