The ceramic microchip generates heat power of 25 W, which dissipates to the environment by convection through all external faces of the microchip and all external faces of the copper heat sink. The initial temperature of all components is assumed to be 25 °C . The surface convection coefficient between the microchip and the surrounding air is h = 100 W/(m2. °C ) and h = 250 W/(m2. °C ) between heat sink and the air. The three terminal connectors are insulated; they do not dissipate any heat.

Max temperature = 179.61 °C and min temp = 87.33 °C.

We conclude that microchip is overheating

The max total heat flux value of 5.5647e+005 W/m²represents the fact that every second the energy of 5.5647E+05 Joules flows through one m2 of the surface area.

The middle connector has the temperature of 163.22 °C.

The max steady state temperature is reached at 160 seconds.

The housing is made of aluminum and mounted to a pump which is held at a constant temperature of 60 °C. The mating face on the pump is also held at this temperature.

The interior surfaces of the pump are kept at a constant temperature of 90 °C by the fluid and the exterior surfaces are modeled using a simplified convection correlation for stagnant air at 20 °C.

The flat mating surface of the housing is prevented from moving or deforming in the normal direction. Another frictionless supports will be applied to the 8 countersink portion of the mounting holes.

From these results we see that the factor of the safety of this pump housing is ranging between 0.21946 and 15 as a maximum value. Which means the part is unsafe to use under these condition. In order to make it safe we have to change the type of the material

Air enters through the small opening of the duct shown below at a rate of 100 in/s.

The Reynolds number at the inlet:

• density:Air Density = 1.21 x 10-7 lb-s2 /in4
• hydraulic diameter: 1.3333 in
• Air Viscosity = 2.642 x 10-9 lb-s /in2

For internal flow, the transition to turbulence occurs within the Reynolds number range of 2000 –3000. Therefore for the CFD solution of air in the duct with Reynolds number 6106.4, the flow will be turbulent.

The resulting path plot shows the flow is turbulent flow. The curve looks relatively uniform, except around 22 in/s velocity, and has a parabolic shape. The maximum velocity reached by the flow was 117 in/s and it was located on the middle flow path of the duct.

i run a 2D flow analysis on 2005 Mini New Hatchback using ANSYS Fluent for air flow at 60 mph. A blueprint of the side view of the car was imported into Solidworks where the profile of the car was used in creating a fluid domain that was imported into ANSYS to conduct the flow analysis.

The casing of the bullet made of copper alloy hits a steel wall. The wall is modeled as rigid body and fixed in the space. The casing has 1 mm thickness and right before hitting the wall, has a speed of 400 m/s (faster than the speed of sound).

The casing is modeled as a bilinear isotropic hardening plasticity material using the material parameters provided in Engineering Data. To simulate the fragmentation, it is assumed that the copper will be torn apart when the plastic strain is larger than 75%.

From the Ansys Workbench results, the maximum plastic strain is 0.74485. The bullet couldn’t resist the impact with the steel wall. Due to the impact the copper alloy casing is not only shorten but also torn apart.

A 10-inch diameter vacuum chamber is sealed by O-Ring made of rubber. The O-Ring is compressed by the top plate by the amount of 0.08 inches downward. Both top plate and groove part are made of structural steel. Partial assembly of the model is shown below.Due to the axial symmetry of the model, the contact analysis of O-Ring is performed on axis ymmetric model.

The result shows that the maximum total deflection is 0.08in, and it is located on the top circular face of the rubber which is connected to the top plate. the maximum Von Mises stress is 436.27 psi, and it is located on the middle of the rubber circle.

SDOF Spring Mass

i used ANSYS to determine the natural frequency and harmonic response from 0 Hz to 100 Hz.

Theoretical Calculation

Harmonic Response

From the result that I got I noted that the maximum total deflection is 0.08in, and it is located on the top circular face of the rubber which is connected to the top plate. In addition, the displacement at the middle of the rubber circle is smaller. It is also noted that the maximum Von Mises stress is 436.27 psi, and it is located on the middle of the rubber circle