Lesson 12 Shock, Vibration, and Compression 第12课冲击、振动和受压
Lesson 12 Shock，Vibration，and Compression 第12课 冲击、振动和受压
Shock Defined as an impact, characterized by a sudden and substantial change in velocity Shocks in the distribution environment Accidental and deliberate drops during manual handling Drops from chutes, conveyors, and other machinery Falls from pallet loads Sudden arrests on conveyors mpacts occurring when vehicles hit potholes, curbs, or railroad tracks
Shock ⚫ Defined as an impact, characterized by a sudden and substantial change in velocity. ⚫ Shocks in the distribution environment: Accidental and deliberate drops during manual handling Drops from chutes, conveyors, and other machinery Falls from pallet loads Sudden arrests on conveyors Impacts occurring when vehicles hit potholes, curbs, or railroad tracks
Shock mpacts occurring when a package is rolled or tipped over Shock due to rail shunting Shock Resulting from Drops can be treated as manual drops o typical manual handling patterns (Figure 12. 1)the basic predictability of package handling
Shock Impacts occurring when a package is rolled or tipped over Shock due to rail shunting Shock Resulting from Drops: ⚫ can be treated as manual drops. ⚫ typical manual handling patterns (Figure 12.1)(the basic predictability of package handling)
Shock 100 90 80 70 60 50 10 10 20 30 40 60 70 Drop height(inches) Figure 12. 1 Cumulative percentage and drop height in next day air parcel delivery for United States Postal Service
Shock Figure 12.1 Cumulative percentage and drop height in next day air parcel delivery for United States Postal Service
Shock generalized drop probability curves (Figure 12.2 illustrating another predictable feature of manual handling: the lighter the package, the higher the probable drop height
Shock ⚫ generalized drop probability curves (Figure 12.2) illustrating another predictable feature of manual handling: the lighter the package, the higher the probable drop height