![]() ![]() Go back to your m-file and add theįollowing line of code to your m-file before the bode command and rerun. Therefore from the previous plot, must be equal to 100 dB or 100,000 to move the magnitude curve up to 0 dB at 0.1 rad/s. The effect of is to move the magnitude curve up (increasing ) or down (decreasing ) by an amount, but the gain,, has no effect on the phase curve. The gain,, makes it easier to add the components of the Bode plot. You should get the following Bode plot:įor convenience in representing systems with different natural frequencies of the system, we normalize and scale our findingsīefore plotting the Bode plot, so that the low-frequency asymptote of each term is at 0 dB. Add the following line of code to your m-fileĪnd rerun. Let's first draw the Bode plot for the original open-loop transfer function. Adding a controller to the system changes the open-loop Bode plot so that the closed-loop response will also change. The main idea of frequency-based design is to use the Bode plot of the open-loop transfer function to estimate the closed-loop Plotting the frequency response in MATLAB The system model can be represented in MATLAB by creating a new m-file and entering the following commands (refer to the main problem for the details of getting those commands).ĭenp= ĭen1= Step, the bus body will oscillate within a range of +/- 5 mm and will stop oscillating within 5 seconds. ![]() For example, when the bus runs onto a 10-cm (X1-X2) has a settling time less than 5 seconds and an overshoot less than 5%. We want to design a feedback controller so that when the road disturbance (W) is simulated by a unit step input, the output Plotting the frequency response in MATLABįrom the main problem, the dynamic equations in transfer function form are the following:Īnd the system schematic is the following where F(s)G1(s) = G2(s).įor the original problem and the derivation of the above equations and schematic, please refer to the Suspension: System Modeling page. ![]()
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