this is a FEM question.

1a. Describe the procedure for calculating the maximum stress for a quick heating of a machine.

1b. Suppose we have a vibrating machine component and that we know the size and frequency of the interference. Explain how we can calculate the maximum stress in the vibrating machine component.

3 Question 3: In an air standard Diesel cycle with compression ratio 14, the conditions of the air at the start of compression stroke are 1 bar and 300 K. After addition of heat at constant pressure, the temperature rises to 2774 K. Determine: a) the thermal efficiency of the cycle b) the net work done per kg of air and the c) mean effective pressure

A two-cylinder, four-stroke gas engine has a bore of 380 mm and a stroke of 585 mm. At 240 rev/min the torque developed is 11.86 kNm. If the engine is supplied with a mixture of gas and air in the proportion of 1 to 7 by volume. The estimated volumetric efficiency is 85% and the Qnet,p of the gas is 38.6 MJ/m3. Calculate the brake thermal efficiency of the engine.

Assume the water for a boiler is preheated using flue gases from the boiler stack. The flue gases are available at a rate of 0.25 kg/s at 150°C, with a specific heat of 1000 J/kg · K. The water entering the exchanger at 15°C at the rate of 0.05 kg/s is to be heated to 90°C. The heat exchanger is to be of the type with one shell pass and four tube passes. The water flows inside the tubes, which are made of copper (2.5 cm ID, 3.0 cm OD). The heat transfer coefficient on the gas side is 115 W/m² · K, while the heat transfer coefficient on the water side is 1150 W/m² · K. A scale on the water side and gas side offer an additional total thermal resistance of 0.000176 m² · K/W. a. Determine the overall heat transfer coefficient based on the outer tube diameter. b. Determine the appropriate mean temperature difference for the heat exchanger. c. Estimate the required total tube length. d. Calculate the percent over surface design and the cleanliness factor.

Describe all the steps necessary to determine the Miller indices for a given plane. Use a sketch of an example to demonstrate the process. Show all possible steps and be specific and complete

Schematically show (1) forces (including all components and resultant force) at the tool-chip surface, (2) forces (including all components and resultant force) at the material shear plane, and (3) depth of cut and chip thickness of orthogonal cutting.

A fluid flow field is given by v = x^2yi + y^2zj-(2xyz + z^2)k. Prove that it is a case of possible steady in compressible flow. Calculate the velocity and acceleration at the point (2,1,3).

7.1. Explain briefly what you understand by each of the following terms, as used in the context of Life Cycle Assessment. Provide an example in each case.   

Problem Shifting

Functional Unit

Characterisation             

please type it in a computer   

Suggest a reasonable choice of functional unit for use in a life cycle assessment (LCA) of each of the following products. In each case write a sentence or two justifying your choice.                                                                 [8 marks]

-Paint used for decorating

-Washing powder                     

PLEASE DO IT ON COMPUTER

BEST REGARDS

(i) Write down the wave equation and find the general solution for longitudinal vibration of a beam using the method of separation of variable separation.

(ii) Find three lowest natural frequencies of longitudinal vibration of 1.5m beam with free-free boundary conditions at the ends. The modules of elasticity is 200e^9 N/m and density 7500 kg/m³.

In an orthogonal machining test, we have the following data:

Chip width = 2.5mm

Chip thickness after cut = 1 mm

Cutting ratio = 0.25

Chip – tool contact length on the tool rake = 1 mm

Rake angle = -5 degrees (negative rake)

Cutting force = 900N

Thrust force = 900N

a)       Calculate the mean shear stress on the shear plane

b)      Calculate the mean frictional stress on the tool rake

Make the calculations using the cutting ratio formula and the geometry of the force circle; calculating the resultant force, the shear force on the shear plane and the area of the shear plane. Also, find the frictional force on the rake and the chip-tool contact area.

A steel string of length 2.0 meters and mass 15g/m is stretched with a tension of 120 N and is fixed at both ends.

(i)   Write down the wave equation and find the general solution for string oscillations using the method of variable separation.

(ii)   Find the 1^st three natural frequencies and draw the corresponding mode shapes.

Using excel UserForm construct a Flowchart that solves a quadratic equation ax^2+bx+c=0 for changingvalues of a, b and c. Please also display the code you have used.

Please use excel UserForm

Thanks

How to choose suitable hydraulic components for a parallel hydraulic hybrid vehicle? Explain briefly for each components (pump, motor, accumulator and etc)

Using CNCSimulator Pro, engrave (KAU) on a workpiece