The Calculation And Analysis For Strength And Mode Of Intake Grid And The Visual Program Of The Gross Longitudinal Strength

Dynamic problems aboard have enjoyed an increasing popularity. When the ships are on sailing, hull receive vibration in varying degrees due to the running of engine and propellers. The priority is to avoid resonance. Generally speaking, the gross vibration of hull generated by engine or propellers will not result in the obvious vibration stress. For example, amplitude is equal to 1 mm two-node vibration. The average vibration stress in the midship with the length of 100-200 meters is only 1.0-2.0N/mm2. But it would be a different case when resonance occurs. Take a ship with a tonnage of 11000, the maximum amplitude can reach 18mm, and the vibration stress can reach 29N/mm2 when resonance takes place.As a propelling way, water jet uses the counter force generated by water flow at a high speed by pumps to keep the ship sailing. Because its advantages of small resistance force, good protection and low noise level, it...