Torsional and bending rigidity is a critical parameter for any automobile, especially vehicles with a unibody construction. However, bending rigidity isn’t as critical as torsional rigidity in the design of a vehicle. Unibody torsional rigidity is a measure of the force required to induce a one-degree “twist” in a car’s body structure. Naturally, a higher…
Have you ever asked yourself what are the natural frequencies a truck body-on-frame is subject to? Well, you would if you were trying to design one! One of the key areas of focus in automotive manufacturing research is the reduction of chassis mass and production costs. However, when you begin to reduce the mass of…
Why is FEA important for engineering? Finite Element Analysis (FEA) involves simulating various physical phenomena using the numerical technique known as the Finite Element Method (FEM). Engineers employ FEA software to streamline the design phase, minimizing the need for physical prototypes and experiments, and enhancing product development efficiency while reducing costs. A comprehensive understanding and…
A one-dimensional plane wall of thickness 2L=100mm experiences uniform thermal energy generation of q dot=1000 W/m3 and is convectively cooled at x=+/-50mm by an ambient fluid characterized by T infinity=20°C. If the steady-state temperature distribution within the wall is T(x)=a(L2-x2)+b where a=10 °C /m2 and b=30 °C, what is the thermal conductivity of the wall?…
The temperature distribution across a wall 0.3 m thick at a certain instant of time is T(x) = a + bx + cx2, where T is in degrees Celsius and x is in meters, a = 200 °C, b = -200 °C /m, and c = 30 °C /m2, The wall has a thermal conductivity…
Uniform internal heat generation at q˙= 5 × 107 W/m3 is occurring in a cylindrical nuclear reactor fuel rod of 50-mm diameter, and under steady-state conditions the temperature distribution is of the form T(r)=a+br2, where T is in degrees Celsius and r is in meters, while a= 800 °C and b= -4.167 × 105 °C/m2. The fuel rod properties are…
A blood warmer is to be used during the transfusion of blood to a patient. This device is to heat blood taken from the Blood Bank at 10°C to 37°C at a flow rate of 200 mL/min. The blood passes through tubing of length 2 m, with a rectangular cross-section of 6.4 mm x 1.6…
A spherical interplanetary probe of 0.5-m diameter contains electronics that dissipate 150 W. If the probe surface has an emissivity of 0.8 and it does not receive radiation from other surfaces, such as the sun, what is its surface temperature of the probe? All sample problems and notes are based on the following textbook: Fundamentals…
A square isothermal chip is of width w = 5 mm on a side and is mounted in a substrate such that its side and back surfaces are well insulated, while the front surface is exposed to the flow of a coolant at T_infinity = I5 °C. From reliability considerations, the chip temperature must not…
You’ve experienced convection cooling if you’ve ever extended your hand out the window of a moving vehicle or into a flowing water stream. With the surface of your hand at a temperature of 30 °C. determine the convection heat flux for a vehicle speed of 35 km/h in air at -5 °C with a convection…