Add Z-axis accelerometer and geophone subsystems

src/initializeZAxisAccelerometer.m

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+function [accelerometer] = initializeZAxisAccelerometer(args)
+    arguments
+        args.mass (1,1) double {mustBeNumeric, mustBePositive} = 1e-3 % [kg]
+        args.freq (1,1) double {mustBeNumeric, mustBePositive} = 5e2  % [Hz]
+    end
+
+    %%
+    accelerometer.m = args.mass;
+
+    %% The Stiffness is set to have the damping resonance frequency
+    accelerometer.k = accelerometer.m * (2*pi*args.freq)^2;
+
+    %% We set the damping value to have critical damping
+    accelerometer.c = 2*sqrt(accelerometer.m * accelerometer.k);
+
+    %% Save
+    save('./mat/accelerometer_z_axis.mat', 'accelerometer');
+end

src/initializeZAxisGeophone.m

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+function [geophone] = initializeZAxisGeophone(args)
+    arguments
+        args.mass (1,1) double {mustBeNumeric, mustBePositive} = 1e-3 % [kg]
+        args.freq (1,1) double {mustBeNumeric, mustBePositive} = 1    % [Hz]
+    end
+
+    %%
+    geophone.m = args.mass;
+
+    %% The Stiffness is set to have the damping resonance frequency
+    geophone.k = geophone.m * (2*pi*args.freq)^2;
+
+    %% We set the damping value to have critical damping
+    geophone.c = 2*sqrt(geophone.m * geophone.k);
+
+    %% Save
+    save('./mat/geophone_z_axis.mat', 'geophone');
+end