bottom dead center

简明释义

下死点

英英释义

例句

1.Adjusting the timing requires knowledge of when the engine is at bottom dead center.

调整时机需要了解发动机何时处于下死点。

2.The mechanic explained that the valves close just before reaching bottom dead center.

机械师解释说，阀门在达到下死点之前关闭。

3.When performing a compression test, you need to ensure the piston is at bottom dead center.

进行压缩测试时，您需要确保活塞处于下死点。

4.Before starting the engine, make sure the crankshaft is at bottom dead center.

在启动发动机之前，请确保曲轴处于下死点。

5.The piston reaches bottom dead center when it is at its lowest point in the cylinder.

活塞在气缸的最低点时达到下死点。

作文

In mechanical engineering, understanding the concept of bottom dead center is crucial for anyone working with engines or similar machinery. The term refers to a specific point in the cycle of an engine's operation where the piston is at its lowest position within the cylinder. This position is significant because it represents the moment when the piston has completed its downward stroke and is about to begin its upward movement. Knowing this point helps engineers design better engines and optimize their performance.The importance of bottom dead center cannot be overstated. For instance, during the four-stroke cycle of an internal combustion engine, the piston moves up and down within the cylinder. The strokes are categorized as intake, compression, power, and exhaust. At the end of the intake stroke and the beginning of the compression stroke, the piston reaches the bottom dead center. This is a critical moment because it marks the transition between these two phases. If the timing of the ignition occurs too early or too late relative to this point, it can lead to inefficient combustion, reduced power output, and increased emissions.Moreover, the bottom dead center also plays a role in the overall efficiency of an engine. When the piston is at this position, it is essential for the engine to have the right amount of fuel-air mixture ready for the next stroke. Engineers often use computer simulations to analyze the behavior of the engine at this point, allowing them to make adjustments that improve performance.In addition to its technical implications, the concept of bottom dead center serves as a metaphor in various aspects of life. Just as an engine must reach this low point before it can ascend again, individuals often find themselves at a low point before making significant changes or improvements in their lives. Recognizing this can provide insight into personal growth and resilience. It reminds us that hitting rock bottom can be a necessary step toward achieving greater heights.For students of engineering, grasping the mechanics behind bottom dead center is foundational. It is not just about memorizing definitions; it requires a deep understanding of how various components of an engine interact. Practical experience, such as working on an engine or using simulation software, can enhance this understanding. By observing how the engine operates around the bottom dead center, students can appreciate the intricacies of engine design and functionality.In conclusion, the concept of bottom dead center is vital in both engineering and life. It signifies a turning point that leads to progression and improvement. Understanding this concept allows engineers to create more efficient machines and encourages individuals to embrace their low points as opportunities for growth. Thus, whether in a workshop or in personal experiences, recognizing the significance of bottom dead center can lead to better outcomes and greater achievements.

在机械工程中，理解“底死点”这一概念对于任何从事发动机或类似机械工作的人来说都是至关重要的。该术语指的是发动机运转周期中的一个特定点，即活塞在气缸内处于最低位置的时刻。这个位置非常重要，因为它代表着活塞完成下行行程并即将开始上行运动的时刻。了解这一点有助于工程师设计更好的发动机并优化其性能。“底死点”的重要性不容小觑。例如，在内燃机的四冲程循环中，活塞在气缸内上下移动。这些冲程分为进气、压缩、动力和排气。在进气冲程结束和压缩冲程开始时，活塞达到“底死点”。这是一个关键时刻，因为它标志着这两个阶段之间的过渡。如果点火时机相对于这一点过早或过晚，可能会导致燃烧效率低下、功率输出减少以及排放增加。此外，“底死点”还在发动机的整体效率中发挥作用。当活塞处于这个位置时，发动机必须准备好适量的燃油-空气混合物以迎接下一个冲程。工程师们常常使用计算机模拟来分析发动机在这一点上的行为，从而进行调整以提高性能。除了技术含义外，“底死点”的概念在生活的各个方面也可以作为一种隐喻。正如发动机必须达到这个低点才能再次上升，个人往往在生活中也会经历低谷，然后做出重大改变或改善。认识到这一点可以为个人成长和韧性提供洞察力。它提醒我们，触底反弹可能是实现更高目标的必要步骤。对于工程学生来说，掌握“底死点”背后的机械原理是基础知识。这不仅仅是记住定义；它需要深入理解发动机各个组件如何相互作用。实践经验，例如拆解发动机或使用模拟软件，可以增强这种理解。通过观察发动机在“底死点”附近的运作，学生可以欣赏发动机设计和功能的复杂性。总之，“底死点”这一概念在工程和生活中都是至关重要的。它象征着一个转折点，通向进步和改善。理解这一概念使工程师能够创造出更高效的机器，同时鼓励个人将低谷视为成长的机会。因此，无论是在车间还是在个人经历中，认识到“底死点”的重要性都能带来更好的结果和更大的成就。