RESURCH PROJECTS:
 
 

• Power efficiency of active structural-acoustic control systems is my dissertation.  In this project point force actuators the patched piezoelectric ceramic (PZT) actuators were applied to excite the structures. Different models including the coupled electro-mechanical models were used to study the power efficiency. Different numbers of PZT actuators were applied at different locations to control the sound pressure level. See more discussions in my adviser. Dr. Don Leo's descriptions.

• An experimental investigation of the actuator power efficiency and noise control of a flat panel speaker. Experimental modal analysis was performed and the vibrometer was used to measure the responses. One of the advantages of this non-contact test is that the response of the speaker will not be affected by the measurement transducers. Experimental data recorded by Tektronik were used to extract frequency, damping ratio using SMS STAR. Results verified the concept of a flat speak design to achieve the maximum resonance frequencies in order to reduce the effect of the directivities on the response of the speaker.

                                                             

                                                            The experimental setup

• An experimental modal analysis of a T plate. Impact test was tested and the data were saved by a HP dynamic analyzer. Frequencies, and damping ratios information were investigated using LMS software. In the meanwhile, a finite element analysis model was developed using SDRC's I-DEAS simulation. The FEA frequencies, mode shapes and experimental ones were compared. MAC between the FEA and experimental modes had a good match.

• The stress distribution investigation of a thread connector using 3D FEA. Most models on the stress analysis of a thread connector were two dimensional or one dimensional. In this project, a solid model of thread connect was first set up and then three dimensional finite elements were used in the stress analysis and contact elements were used to simulate the working procedure of the connector. In addition, a spring model reflecting the elasticity of the members was used to investigate the stress distribution. Both the FEA model and the spring model agreed with that conclusion that the maximum stress occurs at the first thread.

• An investigation of reducing recoil force and noise of an aircraft gun. Because the recoil force of the chosen aircraft gun was too big to install in a helicopter, the objective of this project is to investigate the possibility of reducing the magnitude of the reaction force and make it practical to be installed into the helicopter. Based on the experimental data, a simulation was first performed. Then the buffer and muffler were redesigned based on the optimization. Furthermore, a full floating test was successfully carried out using the improved aircraft gun. The experiment demonstrated that the peak of the force reduced by 3/4 and this gun can be installed into the helicopter.

• The development of database and management software of an automatic weapon museum. A database was set up and the corresponding management software was development.