Software Listing of Author : "Agustinus Oey"

This simple simulation shows the implementation of FxLMS algorithm for a single channel feed-forward active noise control system. Here, the controller generates an "anti-noise" signal to result a destructive interference at the sensor position. The objective is to minimize the noise residue. The process comprises of two tasks: the "off-line" identification of the secondary propagation path that stays between the actuator and sensor; and the "on-line" control, in which the parameters of the controller are adjusted. Similar to my previous code, "BEM Code for 2D Pulsating Cylinder", I use only simple programming technique and basic commands. Function "filter()" can be substitute with convolution routine, i.e., y=h(k)*s(k). A brief explanation on the system and line by line comments are provided.

  • Platform: Matlab, Scripts

This is the code for calculating solid angle C, surface pressure ps, and field pressure pf coming out from a pulsating cylinder with radius of r and normal velocity vn in an unbounded two dimensional acoustic domain using the solution of Helmholtz Integral Equation. For verifying the calculation result, the code will also compare the calculation result with the analytical solution. In case of non-uniqueness problem, for example at r = 1 m and f = 131 Hz, up to 10 CHIEF points can be implemented. The code is written in a very simple and traditional way so that any beginner in MATLAB programming would be able to understand it easily.

  • Platform: Matlab, Scripts

This simple simulation shows the implementation of FbLMS algorithm for a single channel feedback active noise control system. Here, the controller generates an "anti-noise" signal to result a destructive interference at the sensor position. The objective is to minimize the noise residue. FbLMS does not employ any reference sensor. Instead, it uses linear predictor for generating reference signal. Thus, FbLMS is suitable for reducing narrow-band noise. Similar to feed-forward system, the FbLMS algorithm comprises of two tasks: the "off-line" identification of the secondary propagation path that stays between the actuator and sensor; and the "on-line" control, in which the parameters of the controller are adjusted. As usual, I use only simple programming technique and basic commands. Function "filter()" can be substitute with...

  • Platform: Matlab, Scripts

The code demonstrates the application of the principle of virtual work for calculating the steady state transverse displacement of a rectangular clamped thin plate. It was based on a letter written by J. P. Arenas for the editor of Journal of Sound and Vibration (2003). The GUI is designed to be simple. It contains some basic parameters, which can be easily modified, and a single pushbutton for executing the calculation. After brief processing time, the plate response is shown in a figure. Information on non-dimension frequency parameter is provided as well. Similar to my previous codes, I am using a very plain way in writing the code. Comments are given here and there for making the code easy to understand. I will try to provide more explanation on the equations and the code later. Anyhow, my simple wish is that someone could find...

  • Platform: Matlab, Scripts
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