lower dead center

简明释义

下死点

英英释义

例句

1.To ensure proper engine timing, you need to know when the crankshaft is at lower dead center 下死点.

为了确保发动机的时序，你需要知道曲轴何时处于lower dead center 下死点。

2.When the engine is at lower dead center 下死点, it is in a position for optimal fuel injection.

当发动机处于lower dead center 下死点时，它处于最佳燃油喷射位置。

3.The piston reaches its lower dead center 下死点 during the compression stroke.

活塞在压缩行程中达到它的lower dead center 下死点。

4.The technician marked the lower dead center 下死点 on the flywheel for reference.

技术员在飞轮上标记了lower dead center 下死点以供参考。

5.Adjusting the ignition timing requires finding the lower dead center 下死点 of the engine.

调整点火时机需要找到发动机的lower dead center 下死点。

作文

In the world of mechanical engineering, understanding the principles of motion and energy transfer is crucial. One important concept that engineers often refer to is the term lower dead center, which is a critical point in the cycle of a reciprocating engine. The lower dead center (LDC) refers to the position of the piston when it is at its lowest point in the cylinder. This position is significant because it represents the end of the power stroke and the beginning of the exhaust stroke in the engine's cycle. When the piston is at the lower dead center, the volume of the combustion chamber is maximized, allowing for the expulsion of exhaust gases after combustion. Understanding the lower dead center is essential for engineers designing engines, as it influences the efficiency and performance of the engine. For example, if the timing of the valve openings and closings is not correctly aligned with the piston's movement around the lower dead center, it can lead to incomplete combustion or increased emissions. Therefore, engineers must carefully calculate and design the timing mechanisms to ensure that the engine operates smoothly and efficiently.Moreover, the lower dead center plays a role in determining the overall size and design of an engine. The distance between the lower dead center and the upper dead center (the highest point of the piston) affects the stroke length. A longer stroke can provide more power but may also increase the engine's size and weight. Engineers must balance these factors to create an engine that meets specific performance criteria while remaining practical for use in vehicles or machinery.In addition to its mechanical significance, the concept of lower dead center can also be applied metaphorically in various fields. For instance, in personal development, reaching a lower dead center might symbolize hitting a low point before making a comeback. Just as an engine needs to reach this point to expel exhaust and prepare for the next cycle, individuals may need to go through challenging times to regroup and emerge stronger. In summary, the term lower dead center is not just a mechanical term; it encompasses a broader understanding of cycles, whether in engines or in life. By grasping the significance of the lower dead center, engineers can enhance their designs for better performance, while individuals can find inspiration in the idea that difficult moments can lead to growth and renewal. Ultimately, both in engineering and personal experiences, recognizing the importance of reaching a lower dead center can lead to greater insights and advancements in various aspects of life.

在机械工程的世界中，理解运动和能量转移的原理至关重要。工程师们常常提到一个重要的概念，即术语下死点，这是往复发动机循环中的一个关键点。下死点（LDC）指的是活塞在气缸中处于最低位置时的状态。这个位置非常重要，因为它代表了动力行程的结束和排气行程的开始。当活塞位于下死点时，燃烧室的体积最大化，允许在燃烧后排出废气。理解下死点对于设计发动机的工程师至关重要，因为它影响发动机的效率和性能。例如，如果阀门的开启和关闭时机没有与活塞围绕下死点的运动正确对齐，可能会导致燃烧不完全或排放增加。因此，工程师必须仔细计算和设计时序机制，以确保发动机平稳高效地运行。此外，下死点在决定发动机的整体尺寸和设计方面也起着作用。下死点和上死点（活塞的最高点）之间的距离影响着行程长度。较长的行程可以提供更多的动力，但也可能增加发动机的尺寸和重量。工程师必须在这些因素之间取得平衡，以创建符合特定性能标准的发动机，同时保持实用性，以便用于车辆或机械。除了机械意义外，下死点的概念在各个领域也可以比喻性地应用。例如，在个人发展中，达到下死点可能象征着在反弹之前达到低谷。就像发动机需要达到这一点以排出废气并为下一个循环做好准备一样，个人也可能需要经历挑战时期，以重新集结并变得更强大。总之，术语下死点不仅仅是一个机械术语；它包含了对周期的更广泛理解，无论是在发动机中还是在生活中。通过掌握下死点的重要性，工程师可以提升他们的设计以获得更好的性能，而个人则可以从经历艰难时刻的想法中找到灵感，认为这些时刻可以导致成长和重生。最终，无论是在工程还是个人经历中，认识到达到下死点的重要性都可以带来更深刻的见解和各个方面的进步。