好英语网【中文版】
开航前的试车是船舶启动前的重要环节，其中主机是船舶动力的核心部分，因此对主机的检查和测试是试车的重要内容之一。在试车时，会利用船舶的辅助机械系统，如压缩空气、泵浦等，来转动主机，并进行各种测试。
具体来说，开航前的试车会进行以下步骤：
- 启动辅助机械系统：在试车前，需要先启动船舶的辅助机械系统，如压缩空气系统、泵浦等，为转动主机提供动力。
- 启动主机：利用辅助机械系统的动力，通过相应的传动机构将力量传递到主机，使主机转动。
- 测试主机性能：在主机转动后，会对主机的性能进行测试，包括主机的启动转速、加速性能、排放性能等各项指标。
- 停车并检查：在测试完成后，需要将主机停车并检查主机是否有异常现象，如振动、噪音、漏油等。
- 再次启动试车：如果经过检查发现主机无异常现象，则再次启动试车，对船舶的其他系统进行检查和测试。
通过开航前的试车，可以检查出船舶的各种性能指标是否正常，以及各系统的工作是否协调，从而保证船舶的安全和可靠性。
【英文版】
The pre-sail test is an important step before the ship's launch, in which the main engine is the core part of the ship's power. Therefore, inspecting and testing the main engine is an important content of the pre-sail test. During the test, the auxiliary machinery system of the ship, such as compressed air, pumps, etc., will be used to rotate the main engine, and various tests will be carried out.
Specifically, the pre-sail test will carry out the following steps:
- Start the auxiliary machinery system: Before the test, it is necessary to first start the ship's auxiliary machinery system, such as the compressed air system, pumps, etc., to provide power for rotating the main engine.
- Start the main engine: Using the power of the auxiliary machinery system, the corresponding driving mechanism is used to transmit the force to the main engine to rotate it.
- Test the performance of the main engine: After the main engine starts, its performance will be tested, including the starting speed, acceleration performance, emission performance and other indicators.
- Parking and inspection: After the test is completed, it is necessary to park the main engine and inspect whether there are any abnormal phenomena, such as vibration, noise, oil leakage, etc.
- Start the test again: If no abnormal phenomenon is found after inspection, then start the test again to inspect and test other systems of the ship.
Through the pre-sail test, it can be checked whether all performance indicators of the ship are normal and whether the coordination of each system works well, thus ensuring the safety and reliability of the ship.