In order to ensure the safety of the ship, a new ship is required to conduct trial and indoor tests before birth.
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150 years ago, a new test can only go to the sea. If the ship's performance is reliable, it will return to the port safely and start to sail normally. If the ship has a problem, it may never come back, and even if something goes wrong, people can't figure it out. For thousands of years, the only thing human ships have relied on is the experience accumulated by sailors. Every bit of these experiences can have cost countless lives. (Picture) Whether it is a modern large-scale ship with advanced equipment and a floating leaf, the principle of floating on the water is the same. In the 1870s, a new method was adopted, which was small indoors. Test model ship in the pool. The in-pool test provides sufficient basis for hull design and engine selection, a technique unimaginable in the ancient shipbuilding industry. Each type of ship will cause waves when sailing. The size of the wave caused by the model ship can roughly determine how much the engine's power is spent on the wave. The wave resistance of the wave suddenly jumped up after the ship reached a certain speed. Exceeding this most efficient speed requires excessive fuel or engine power to counteract wave resistance. The critical speed is naturally changed according to the length and shape of the hull. The hull of a ship is long and narrow, and the wave resistance will be low, but the cost of shipbuilding will be high. Before designing the hull or ordering the engine, the designer must use model tests to determine the wave resistance to determine the best hull shape and the most efficient engine. The most important test in the room is the test of synchronization. If a giant wheel is shaken, whether it is rocking from the side to the other side or from the bow to the stern, it will shake at the frequency of natural roll or pitch. When the waves slap the hull at the same frequency, that is, under the effect of synchronization, the hull will inevitably increase, and the ship will turn into the sea.
In an indoor test tank, testers can choose the wave frequency and size they are studying to test and reduce the pitching problem by increasing the length of the ship. This kind of experiment is extremely important. It can detect the hidden dangers in the design in advance, and take necessary measures to completely eliminate the possible problems. Other anti-synchronous design methods are: a rotating gyro stabilizer for protecting the balance, which is used to relieve the fixed fins near the bow of the pitch to counteract the moving ribs in the middle of the hull. These inventions, which have been refined after the test of the sink, can make the ship travel in a balanced posture while sailing in the sea with high winds and high tides without danger.
(Figure) The indoor test pool can detect the seaworthiness of the ship.