tailieunhanh - Future Manufacturing Systems Part 5

Tham khảo tài liệu 'future manufacturing systems part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Reliability Modeling and Analysis of Flexible Manufacturing Cells 73 Robot loading unloading time for subsequent parts z-1 1 3 time units Robot unloading time for the last part u-1 1 6 time units Time between machine tool failures X-1 100 time units Repair time down time of the machine tool p-1 10 time units Time between robot failures a-1 Assumed to be zero for this case. Repair time down time of the robot P-1 Assumed to be zero for this case. Pallet transfer time ro-1 4 time units per pallet Pallet capacity n has been varied from 1 to 20 parts pallet. Utilization rates of the production machine the robot and the pallet handling systems are compared for the reliable and unreliable FMC with component failures in order to visualize the effects of these failures on the utilization of different components for different pallet capacities. Figure 3 illustrates the utilization rate of the production machine. As it can be seen from this figure machine tool utilization is highly affected by the pallet capacity up to a certain level and stabilizes thereafter. However there is significant gap between fully reliable cell and the unreliable cell with specified component hazard rates. Decrease in machine tool utilization is directly reflected in cell productivity. The mentioned gap increases with increasing pallet capacity. Production output rate of the cell Qc is obtained by multiplying the machine tool utilization with the average production output rate. For example in case of the pallet capacity of 20 parts pallet production output rate of the fully reliable cell would be about Qc Lmv 1 4 parts time unit while the production output rate of the unreliable cell would be about 1 4 parts time unit. Note that since the average processing time is 4 time units the average output rate is 1 4 parts time unit if the machine is fully utilized. Figure 4 shows the percentage of time the machine would be down due to failures. Reliable cell has zero percentage in .

TỪ KHÓA LIÊN QUAN
crossorigin="anonymous">
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.