In: Mechanical Engineering
information about the metal additive manufacturing process and defects and parameters
In: Mechanical Engineering
I want an example that explains and calculate the kinetics rocket based on FBD by idealizing the NASA space shuttle to a particle which has curvilinear motion. Assume the Earth is flat and state all other assumptions
In: Mechanical Engineering
Plot longitudinal tensile strength of an E-glass/epoxy unidirectionally reinforced composite as a function of volume fraction of fiber and assuming tensile strength follows a volume rule of additivity.
E-glass: modulus = 72.4 GPa, tensile break strength = 2.4 GPa, break strain = 2.6%
epoxy: modulus = 3.5 GPa, tensile break strength = 45 MPa, break strain = 1.28%
In: Mechanical Engineering
What type of directional valve is used to control the
forward and reverse of a double-acting hydraulic piston?
a) 3 way/ 2 position
b) 4 way/ 2 position
c) 4 way/ 3 position
and why?
In: Mechanical Engineering
In: Mechanical Engineering
1. An aluminum circular cylinder 50 mm in diameter with ends insulated is initially at 100◦C. Approximate the temperature at the center of the cylinder after 2 s if the lateral surface is kept at 0◦C.For aluminum, k = 8.6 × 10−5m2 /s.
2. A circular cylinder 1 m in radius is completely insulated and has an initial temperature distribution 100r ◦C. Find an expression for the temperature as a function of r and t. Write integral expressions for at least three coefficients in the series expansion.
In: Mechanical Engineering
In one batch of nickel (Ni)-plated cast iron components, you observed that there were minute pores in the Ni surface coating growing down to the cast iron surface.Should you allow this batch of nickel (Ni)-plated cast iron components be used for a water treatment application? Will the component be susceptible to corrosion and what form of corrosion could occur?
In: Mechanical Engineering
Aquaplaning(General Question)
What is happening physically when a pontoon of a floatplane begins to aquaplane. Like are forces from water on the floats less because its not fully submerged anymore?
In: Mechanical Engineering
The Lockheed SR-71 Blackbird aircraft cruises at Mach number of 3.3 at an altitude of 85,000 ft. Calculate the speed of sound and flight speed at these conditions. Compare the flight speed to the muzzle speed of a 30-06 rifle bullet (700 m/s).
In: Mechanical Engineering
A rigid tank of volume 0.63 m3 initially has some air inside at 0.5 bar and 300 K. A hole develops in the wall, and air from the surroundings at 1 bar, 300 K flows in until the pressure in the tank reaches 1 bar. Heat transfer between the contents of the tank and the surroundings is negligible. The final temperature is 350 K. Use the transient state entropy balcance to find the entropy generation of the process
In: Mechanical Engineering
A steam thermoelectric plant operates a Rankine cycle with overheating. Water enters the pump as saturated liquid , 7.7 kg/s. The efficiency of the pump is 0.9 The water enters the high pression turbine at 12 500 kPa and 550°C, after that steam overheats at a constant pressure of 2000 kPa until 450°C before it expands on the low pressure turbine. The efficiency of both turbines is 0.85. The vapor quality when it enters to the condenser is 0.95 Determine the thermal efficiency of the cycle.
In: Mechanical Engineering
Prepare 5 pages (max. ) brief description about Multiphase flow pumps that work at high gas volume fraction or percentage ( high GVF).
The report should address the following important points:
1- Differences between multiphase flow pump (for gas and liquid mixture) and single phase flow pump (for liquid).
2-Difference between multiphase (gas-liquid) flow pump at high gas percentage (say 80% and above gas) and a compressor.
3-Differences in pump head, pump speed, design and stages should be addressed.
4-How can we modify a single phase flow pump (liquid only) to handle gas-liquid flow
5-How can we modify a gas-liquid flow pump to handle gas percentage rather than low percentage of gas
In: Mechanical Engineering
What are the advantages and disadvantages of the PI controller, PD controller and PID controller ?
ADVANCED DYNAMICS AND CONTROL SYSTEMS
In: Mechanical Engineering
Develop a maintenance/life cycle plan for your house/car. It shall include at least 8 items that are done over the life cycle of the system and go out for at least 5 years.
In: Mechanical Engineering