# Academic Projects

### A finite element approach to simulate surface response of a cylinder due to a subsurface acoustic source

### Problem Statement

Using finite element analysis on ANSYS and ABAQUS to simulate surface oscillation of a cylinder due to an internal oscillating sphere. Compare the results from simulation on ABAQUS with analytical solution and simulation on ANSYS to validate our result.

### Outcome

Compression, shear and surface wave response are formulated using numerical finite element method.

At low audible frequencies compression and shear wave propagation from point source can both be significant with shear wave are less significant as frequency increases

### Energy Audit and HVAC Design of a Small Sized Office Space

### Problem Statement

Simple office space design in Revit.

Calculate the highest load cooling/heating and design based on the highest load

Find out volume flowrate

Design the duct system

### Outcome

Calculate the total heating and cooling load

Generate duct pressure loss report for every section of the duct

Optimize duct sizing to minimize duct and fitting pressure loss

Recommend fan type and power of the AHU.

### Early screening of DDH using ensemble-based machine learning

### Problem Statement

Treatment of Developmental Dysplasia of Hip (DDH) becomes less convoluted if it is detected early

At low audible frequencies compression and shear wave propagation from point source can both be significant with shear wave are less significant as frequency increases

### Outcome

We developed a model to classify the dislocation of the thigh bone from the hip socket.

Acoustic parameters, in conjunction with a linear SVM techniques to achieve an overall accuracy of 79%.

### Experimental investigation on photo strictive materials for MEMS application

### Problem Statement

Transverse deflection of the PLZT optical actuator depends on the light intensity. The deflection of the PLZT optical actuator will vary for the continuous and pulses of lights. Fast response and significant deflection of the PLZT optical actuator under the illumination of light could be used in MEMS applications as a wireless control.

### Outcome

Continuous and pulses of lights deflects PLZT optical actuator.

Transverse deflection of cantilever beam increases with the increase of light intensity.

Locations and boundary conditions influence on the transverse deflection magnitude of cantilever.

### Analysis of Effects of Surface Roughness on Muffler Performance

### Problem Statement

Effect of surface roughness in muffler performance

Design and modelling of an exhaust muffler with different surfaces

Measure the sound attenuation for different input frequency.

Compare experimental sound attenuation and simulation result using COMSOL.

### Outcome

Surface roughness improves sound attenuation in some particular range of frequency.

From 900Hz to 1200 Hz, sound attenuation is greater for rough surface than for smooth surface.