A 1100 kg lift is held by 24 steel cables of mean diameter 20mm. The cables are attached to the lift top and arranged so the torsional vibration is minimised. The lift is accelerating upwards at a rate of 0.22m/s2 It is driven by a winding drum of diameter 1.0m, which has a radius of gyration of 0.45m. The drums mass is 230kg. If the cable is made of steel with an elastic modulus of 185GN/m2 and elastic constant of 200kN/m: 1. Explain the system dynamics after the brake is applied - what assumptions have you made? 2. What is the total displacement of the cable 0.7 seconds after the lift comes to a halt? 3. What is the magnitude of the tangential impact force on the drum at the point of maximum braking? 4. What effect does this impact force have on the rotational axis of the drum? Detail 5. What is the maximum impact force that the cables can withstand before failure occurs, assuming a safety factor of 3.3.|