Refer to Figure 10.3.9, which shows a speed control system using an armature-controlled dc motor. The motor has the following parameter values. Create a Simulink model by modifying Figure 10.3.9 to use PI control instead of P control. Use the PI control gains computed in 10.50 part (b). Kb = 0.199 V-sec/rad Ra = 0.43 KT = 0.14 lb-ft/A ce = 3.6 104 lb-ft-sec/rad Ie = 2.08 103 slug-ft2 La = 2.1 103 H N = 1 a. Run the simulation using a unit-step command starting at t = 0 and a unit-step disturbance starting at t = 4 sec. Plot the speed and the motor current versus time. b. Run the simulation for 0 t 2 sec using a unit-ramp command. Plot the speed error and the motor current versus time.
Monday, September 28, 2015 Reading Questions Friedman 1) Friedman believed that the purpose of a ﬁrm was to act based around the interests of the ﬁrm in order to produce maximum proﬁt and beneﬁt of its employees. Friedman does limit this deﬁnition to exclude social responsibility stating that it is not the main goal or interest of the ﬁrm because you would be spending that of which you have no right to dictate and therefor out of the realm of your job duties. 2) A manager has a speciﬁc job title, and that as a general statement is to act in the best interests of his ﬁrm, excluding social responsibility, in order to achieve maximum proﬁt. Maximum proﬁt also includes services rendered in a situation such as