Esame 2021

Pagina 1

First letter of surname K EXERCISE 1.1 The company HEAT is designing a new AS/RS warehouse with single-deep storage racks. The layout of the new warehouse is shown in Figure 1: the storage aisles, served by one S/R machine each, are located at the left and right sides of the I/O point. The number of aisles located at the left side of the I/O system and at the right side of the I/O system is the same. Based on the following assumptions: • target storage capacity: 7,000 pallet loads (PLs); • number of storage levels: 10; • maximum rack length: 60 m (see Figure 1); • gross size of each storage location: 2,600 * 900 * 1,600 (height) mm; • each storage location can hold 2 pallet loads; • item allocation to the storage locations: random; • Input/Output point at the third level, Determine the minimum number of storage aisles to achieve the required storage capacity. EXERCISE 1.2 Considering the same setting described in Exercise 1.1 and the following additional assumptions: • S/R machine features: o number of forks per S/R machine: 1; o horizontal speed: 2.5 m/s; o vertical speed: 1.1 m/s; o fixed time for positioning: 4 s; o fixed time for one fork cycle: 5 s; o fixed time for acceleration + deceleration: 6 s; o the expected cycle time can be estimated through FEM 9851 rule, • Estimate the average single command cycle time. EXERCISE 1.3 Considering the same setting described in Exercises 1.1 and 1.2, estimate the average dual command cycle time. EXERCISE 1.4 Considering the same setting described in Exercises 1.1 to 1.3 and the following additional assumptions: o availability of each S/R machine: 100%; o availability of the I/O point: 100%, Determine the maximum throughput capacity of the new warehouse. EXERCISE 1.5 Considering the same setting described in Exercises 1.1 to…