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Engineering and Comp Sci Homework Help
What Are the Basics of Deriving Control Transfer Functions?
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[QUOTE="donpacino, post: 5441930, member: 341479"] How do you go from the time domain to the s domain in a purely electrical problem?? also I might be wrong but it looks like there is an error with the equation you were given w[SUB]m[/SUB] is angular velocity. J[SUB]eq[/SUB]ω[SUB]m[/SUB](t)=τm(t) should be J[SUB]eq[/SUB]ω[SUB]m[/SUB]'(t)=τ[SUB]m[/SUB](t) given that friction is 0. also here is a handy guide that derives motor speed / armature voltage. [URL]http://ctms.engin.umich.edu/CTMS/index.php?example=MotorSpeed§ion=SystemModeling[/URL]note: you may be thinking of transfer functions in an odd way. Below is something to maybe help you understand? lets take a current to voltage circuit. your transfer function needs to have the units of voltage/current. therefore... voltage (your output) = current (your input) * voltage/current (filter) lets look at an airplane control yoke. you could say turning right on the yoke rolls the plane the the right, the higher the angle, the greater the roll. so let's say our transfer function is P(Roll Rate)/angle well yes, but there is more to it. you see moving the yoke might just turn a knob on a potentiometer. so really we have p=voltage/angle (the potentiometer transfer function) * P/voltage (the roll rate transfer function) but no, because that has to go through some com protocol and acuator gain we call X so p = voltage/angle (potentiometer gain) * X/voltage (voltage to actuator gain) * P/X (roll rate gain) we can continue this process for a while. The essence of understanding transfer functions like this is to make sure the units work out. so if you want to get a transfer function of w/voltage (angluar velocity per volt), its really just a combination of different smaller transfer functions. break it down if you have to. in the end, it is no different from a 5 stage voltage filter ( volt/volt * volt/volt * current/volt * volt/current *volt/volt) at the end of the day, that is a volt/volt filter understanding the units is the key to understanding controls! [/QUOTE]
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What Are the Basics of Deriving Control Transfer Functions?
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