Controls/Lab/Loudspeaker

This page contains information related to the Loudspeaker Modeling lab for ME 125 and ECE 141. It has been updated for Spring, 2012.

Resources

• Other Pundit Pages
  • MATLAB:Transfer Functions Your friend. Seriously.
• Visualization of a Speaker
  • How Speakers Work, from How Stuff Works
• Files for the lab:
  • MakeNoise.mdl
  • InitNoise.m
  • noiselayout.lay
  • GetNoiseData.m
  • MakeNoiseHandles.m

MATLAB Skeletons

The following shows the comments for a file that was written to graph the transfer function estimate and analytical values for the basic model. You do not have to write your program in this order, but the skeleton may help you understand what needs to happen.

%% Loudspeaker Lab Spring 2012
%  Solution - NAME
%  Honor Code: [net id]

%% Initialize Workspace

%% Load Data - includes EstAccTF, EstAccF, ch1, ch2, and time

%% Set Constants
%  Mechanical constants

%  Some work needed to get b

% Electrical constants

%% Experimental Transfer Function - go from Acc Voltage/Vs to Vel/Vs
%  Convert to velocity by dividing by j 2 pi F and sensitivity in V / (m/s^2)

%% Generate Theoretical Transfer Function

%  Use bode command to analyze transfer function

%% Make and save plot

The following shows the comments for a file that was written to graph the transfer function estimate and analytical values for the refined model.

%% Loudspeaker Lab Spring 2012
%  Solution 2 - NAME
%  Honor Code: [net id]

%% Initialize Workspace

%% Load Data - includes EstAccTF, EstAccF, ch1, ch2, and time

%% Set Constants
%  Mechanical constants

%  Some work needed to get b

%  Electrical constants
 
%  Accelerometer constants

%% Experimental Transfer Function - go from Acc Voltage/Vs to Vel/Vs
%  Convert to velocity by dividing by j 2 pi F and sensitivity in V / (m/s^2)


%% Generate Theoretical Transfer Function

%  Use bode command to analyze transfer function

%% Make and save plot

Questions

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