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14 Cards in this Set
- Front
- Back
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what is the effect of a phase lead controller on the root locus plot?
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adds a zero and a pole therefore therefore movin the centroid away from the Im axis making it more stable
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What is the effect of increasing K of the proportional component of a PID controller?
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- steady state error is reduced
- faster intial response - decreases damping (hence increases overshoot) but settling time is reduced |
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What is the effect of increasing K of the integrgal component of a PID controller?
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- reduces SSE to zero for any value of K
- slightly increases intial response - decreases SSE at a faster rate - decreases stability due to addition of pole at origin |
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What is negative velocity feedback and what is the effect of increasing K of the derivative part of a PID controller?
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-it is the derivative term
- increases damping without decreasing Kprop - steady state error unchanged - faster initial response - may amplify noise if present |
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What is the transfer function of pure delay?
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IMAGE
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what is the Nyquist frequency and what does it mean?
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maximum frequency of the input signal without aliasing
fN=delta/2 |
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what is the resolution of a n-bit ADC?
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a/2^n
where a is the range |
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what is the dynamic range of a n-bit ADC?
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¦20log(1/s^n)¦
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what is the total time delay of a control lop with a digital control?
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1.5*delta
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what is the expression for velocity resolution?
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resolution/loop rate
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what is the time delay for n sample periods?
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image
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what is Euler's backwards difference approximation?
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IMAGE
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what is the equation for peak time?
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Tp=pi/wd
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what is the equatio for damping ratio from maximum overshoot?
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IMAGE
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