bottom dead center

简明释义

下死点

英英释义

例句

1.The technician explained that the engine misfire was due to the spark plug firing too early before reaching bottom dead center 下止点.

技术员解释说，发动机失火是因为火花塞在达到下止点之前过早点火。

2.Adjusting the valve timing requires checking the position of the crankshaft at bottom dead center 下止点.

调整气门时机需要检查曲轴在下止点的位置。

3.The piston reached the bottom dead center 下止点 before the ignition occurred.

活塞在点火前达到了下止点。

4.During the compression stroke, the cylinder will move from bottom dead center 下止点 to top dead center.

在压缩行程中，气缸将从下止点移动到上止点。

5.To ensure proper engine timing, it's crucial to know when the crankshaft is at bottom dead center 下止点.

为了确保发动机的正确时机，了解曲轴何时处于下止点是至关重要的。

作文

In the world of mechanical engineering, understanding the various terms and concepts is crucial for anyone involved in the design and operation of engines. One such term that often comes up is bottom dead center, which refers to a specific position in the cycle of a reciprocating engine. To put it simply, bottom dead center (BDC) is the lowest point that a piston can reach in its stroke. This position is significant because it marks the end of the piston's downward movement and the beginning of its upward journey. The importance of bottom dead center cannot be overstated. When the piston reaches this position, it allows for the maximum volume of the combustion chamber, which is essential for the intake of fuel and air mixture. This is particularly important in internal combustion engines, as the efficiency of the engine largely depends on how well the fuel and air are mixed before ignition. Moreover, understanding bottom dead center is vital for timing purposes. In a four-stroke engine, there are specific moments when the valves open and close in relation to the piston's position. Knowing when the piston is at bottom dead center helps engineers design the timing of these events accurately. For example, during the intake stroke, the intake valve should be open while the piston moves towards bottom dead center, allowing the maximum amount of air-fuel mixture to enter the cylinder. In addition to its role in the intake process, bottom dead center is also critical during the exhaust stroke. Once the combustion has occurred, the piston moves back up to push out the exhaust gases. The position at bottom dead center indicates that all the gases have been expelled, and the cycle can begin anew. Furthermore, the concept of bottom dead center is not limited to just engine mechanics; it also plays a role in various other fields such as robotics and automation. For instance, in robotic arms that utilize linear actuators, knowing the bottom dead center position can help in programming the arm's movements accurately. In conclusion, the term bottom dead center is fundamental in understanding the mechanics of engines and other machinery. It represents a critical point in the operational cycle of a piston, influencing both the intake and exhaust processes. By grasping the significance of bottom dead center, engineers and technicians can enhance the performance and efficiency of their designs, leading to better overall functionality. Therefore, whether you are a student of engineering or a professional in the field, familiarizing yourself with terms like bottom dead center is essential for success in this dynamic and ever-evolving industry.

在机械工程领域，理解各种术语和概念对任何参与发动机设计和操作的人来说都是至关重要的。其中一个常常出现的术语是底死点，它指的是往复发动机循环中的特定位置。简单来说，底死点（BDC）是活塞在其行程中可以达到的最低点。这个位置非常重要，因为它标志着活塞向下运动的结束和向上运动的开始。 底死点的重要性不容小觑。当活塞达到这一位置时，它允许燃烧室的最大体积，这对于进气混合物的吸入至关重要。这在内燃机中尤其重要，因为发动机的效率在很大程度上取决于燃料和空气在点火前混合得有多好。 此外，理解底死点对于时机的把握也至关重要。在四冲程发动机中，阀门的开启和关闭与活塞的位置有特定的关系。知道活塞位于底死点时，可以帮助工程师准确设计这些事件的时机。例如，在进气行程中，当活塞朝底死点移动时，进气阀应该打开，以便让尽可能多的空气-燃料混合物进入气缸。 除了在进气过程中的作用外，底死点在排气行程中也至关重要。一旦燃烧发生，活塞会向上移动以排出废气。位于底死点的位置表明所有气体已经排出，循环可以重新开始。 此外，底死点的概念并不仅限于发动机机械；它还在机器人和自动化等其他领域发挥作用。例如，在利用线性执行器的机器人手臂中，了解底死点位置可以帮助准确编程手臂的运动。 总之，术语底死点在理解发动机和其他机械的工作原理中是基本的。它代表了活塞操作循环中的一个关键点，影响着进气和排气过程。通过掌握底死点的重要性，工程师和技术人员可以提高其设计的性能和效率，从而实现更好的整体功能。因此，无论你是工程专业的学生还是该领域的专业人士，熟悉像底死点这样的术语对于在这个动态且不断发展的行业中取得成功都是必不可少的。