Figure P4.17 shows the free-body diagrams for planetary gear components used in the variable valve timing (VVT) system of an internal combustion engine (Ren, 2011). Here an electric motor is used to drive the carrier. Analysis showed that the electric motor with planetary gear load (Figure P4.17) may be represented by the following equation: cs GesEas GmsTcams where cs is the output carrier angular speed in rad/s, Ea(s) is the input voltage applied to the armature, and Tcamsis the input load torque. The voltage input transfer function, Ge(s), is Ges K RmJs D KKm 45 0:2s 1 and the load torque input transfer function, Gm(s), is Gms Rmk RmJs D KKm 5 0:2s 1 Find an analytical expression for the output carrier angular speed, ct, if a step voltage of 100 volts is applied at t = 0 followed by an equivalent load torque of 10 N-m, applied at t = 0.4 sec.
Class 3- Online Commentary and Criticism Consequences Homophily: • Fake news problem • Means: like of the same o Tendency to choose people we want to be around because they are like us (similar interests, political ideologies, values, etc.) • Facebook newsfeed algorithm o Shows other people’s content based on past action/interaction on the site § Results in social media “echo chamber” • People are not always aware of bias WIRED: “Blame the Echo Chamber on Facebook. But Blame Yourself, Too”: • 60% of millennials use FB as primary news source • 3 factors of cross-cutting: o occurs when you read/share something that has a different perspective than your own 1. w