Show that the torsional strain energy of a solid circular shaft
transmitting power at a constant speed
is given by the equation:
U = (shear stress^2/4G) * volume.
Such a shaft is 0.06 m in diameter and has a flywheel of mass 30 kg
and radius of gyration 0.25 m situated at a
distance of 1.2 m from a bearing. The flywheel is rotating at 200
rev/min when the bearing suddenly seizes. Calculate
the maximum shear stress produced in the shaft material and the
instantaneous angle of twist under these conditions.
Neglect the shaft inertia. For the shaft material G = 80
GN/m^2.
In: Mechanical Engineering
detect skin region for the input image, using the following condition for each pixel:
R > 95 and G > 40 and B>20 and max{R,G,B} - min{R,G,B} >15 and |R-G| > 15 and R>G and R>B
please solve the problem using matlab code
In: Mechanical Engineering
A shrink-fit process has been used to enhance the pressure carrying capacity of a cylinder. During the process, two concentric cylinders are shrunk fitted together to form a composite open-ended cylinder. Before the shrink-fit process, the inner cylinder has an inner radius of 50 mm and outer radius 75.025 mm, while the outer cylinder has an inner radius of 75 mm and outer radius of 150 mm. Both cylinders are made of steel with Young’s modulus E = 200 GPa, Poisson’s ratio = 0.28, and yield stress Y = 600 MPa. Due to the shrink-fit process, an interface pressure (or shrink-fit pressure), Pc = 16.9 MPa, develops at the interface between the two cylinders
(b) After the shrink-fit process, the open-ended composite cylinder is to be used at an internal pressure Pi. What is the maximum internal pressure that can be applied to ensure simultaneous initiation of plastic yielding at the inner radii of the inner and outer cylinders? Assume Tresca yield criterion.
In: Mechanical Engineering
Question #1
C4H10O with a butanol combustion cycle (formation
enthalpy-332,000 kJ / kmol)
25 per cent excess air (reagents at standard conditions T = 25 C, P
= 1atm). Identify
-Air-fuel ratio
-fuel-to-air ratio
-Molar fractions of the product
-Adiabatic flame temperature
-If the products are produced at a temperature of 600 K,
determine the heat generated in the product.
Chamber of combustion
In: Mechanical Engineering
Carry out the equipment and operating procedures between injection molding of thermoplastics and injection molding of thermosets(full detailed answer)
In: Mechanical Engineering
A stationary power plant operates on Brayton cycle has
a pressure ratio of 8. The gas
temperature is 300 K at the compressor inlet and 1300 K at the
turbine inlet. Assuming
a compressor efficiency of 80 percent and a turbine efficiency of
85 percent, determine:
1) the gas temperature at the exits of the compressor
and the turbine,
2) the back work ratio,
3) the thermal efficiency of the cycle,
4) the thermal efficiency of the gas-turbine power plant as
described above, if a
regenerator with effectiveness of 80% is installed. Explain your
answer by
comparing it to answer iii) and show the process on a T-s
diagram.
In: Mechanical Engineering
A double pane window consists of two pieces of glass each of 8 mm thick that enclose an air space of 8 mm thick. The window separates room air at 18°C from outside ambient air at -8°C. The convection coefficient associated with the inner (room-side) surface is 12W/m2 .K. The thermal conductivity of the glass is kg=1.35 W/m. K and that of the air is ka=0.027 W/m. K Q1- If the outside air convection coefficient is ho = 76 W/m2 .K what is the heat loss through a window that is 0.8 m long by 0.5 m wide? Neglecting radiation and assume the air enclosed between the panes to be stagnant. Q2- We consider now that the heat transfer in the air gap is transferred by conduction and radiation and that the radiation coefficient hrad = 3 W/m2 K . Show the thermal circuit representing the steady state situation and define the new heat transfer loss through the window
In: Mechanical Engineering
A steam turbine receives 8 kg/s of steam at 9 MPa, 650 C and 60 m/s (pressure, temperature and velocity). It discharges liquid-vapor mixture with a quality of 0.94 at a pressure of 325 kPa and a velocity of 15 m/s. In addition, there is heat transfer from the turbine to the surroundings for 560 kW. Find the power produced by the turbine and express it in kW
In: Mechanical Engineering
Kindly answer the following short answers asap please.
1.What are the criteria for selecting offshore structures.
2.Define production packer. Draw a simple diagram that represents it
In: Mechanical Engineering
A single stage double acting air compressor delivers 15 m3/min. measured at 1.013 bar and temperature 270C and delivers at 7 bar. The conditions at the end of the suction stroke are pressure 0.98 bar and temperature 400C. The clearance volume is 4% of the swept volume and the stroke / bore ratio is 1.3/1, compressor runs at 992 rpm. Calculate the volumetric efficiency, cylinder dimensions, indicated power and isothermal efficiency of this compressor. Take the index of compression and expansion as 1.3, R= 0.587kJ/Kg-K.
In: Mechanical Engineering
As an engineer, you are asked to choose between a PV
panel system and a wind turbine for your site. PV panel system
costs 900,000 USD to implement while the cost of the wind turbine
system is 500,000 USD. PV panels have a lifetime of 25 years, and
wind turbine lifetime is 15 years. The annual operation and
maintenance cost of PV is 30,000 USD, and wind turbines are 50,000
USD. From the annual electricity generation, PV panels are making
250,000 USD every year, while this amount is 180,000 USD for the
wind turbine. The salvage value of the PV is 80,000 USD, and the
salvage value of the wind turbine is 30,000 USD. The interest rate
is 10%.
a) Compare the annual worth of PV and wind
turbines.
b) Compare the payback period of PV and wind
turbines.
c) Compare the Benefit/Cost ratio of PV and wind turbines.
d) Select one option (PV or turbine) for your site. Include an
explanation of why you select that option.
In: Mechanical Engineering
Determine the correlation function of the square wave. b) Determine the cross relationship functions of the triangular wave and the square wave. c) Explain the random variable, statistical mean, time average, variance and moment concepts.
In: Mechanical Engineering
Methane gas enters a horizontal pipe with a thin wall of 25 cm diameter at a temperature of 309 C with 4.5 tons of mass flow per hour and exits at 289 C. The pipe is smooth and its length is 10 m and the ambient and environmental temperature is 25 C. Since the smear coefficient of the pipe surface is given as 0.8;
a-) Indoor and outdoor convection coefficients (W / m2K),
b-) Heat loss from the pipe to the environment (W),
c-) The surface temperature of the pipe (C),
d-) Calculate the required fan control (W) and interpret the results.
In: Mechanical Engineering
Write a report on AI based Social distancing monitoring using drone with out human interaction report should contain drone design it specification it's algorithm control system algorithm.minimum 10 A4 size page.No plagiarism is allowed other wise down rate is given
In: Mechanical Engineering
A 2-m3 rigid insulated tank initially containing saturated water vapor at 1 MPa is connected through a valve to a supply line that carries steam at 400°C. Now the valve is opened, and steam is allowed to flow slowly into the tank until the pressure in the tank rises to 2 MPa. At this instant the tank temperature is measured to be 300°C. Determine the mass of the steam that has entered and the pressure of the steam in the supply line. The initial and final properties of steam in the tank are v1 = 0.19436 m3/kg, u1 = 2582.8 kJ/kg, v2 = 0.12551 m3/kg, and u2 = 2773.2 kJ/kg. Solve using appropriate software.
The mass of the steam is kg.
The pressure of the steam is kPa.
In: Mechanical Engineering