upper dead center

简明释义

上死点

英英释义

例句

1.The piston reaches the upper dead center 上死点 at the end of the compression stroke.

活塞在压缩行程结束时达到上死点。

2.The mechanic explained that the engine's efficiency can be affected if it does not reach upper dead center 上死点 properly.

机械师解释说，如果发动机未能正确达到上死点，其效率可能会受到影响。

3.In a two-stroke engine, the fuel mixture is compressed just before reaching upper dead center 上死点.

在二冲程发动机中，燃油混合物在达到上死点之前被压缩。

4.When the crankshaft is at upper dead center 上死点, the valves are closed.

当曲轴处于上死点时，气门是关闭的。

5.To adjust the ignition timing, you need to set the engine at upper dead center 上死点.

要调整点火时机，您需要将发动机设置在上死点。

作文

In the world of mechanics and engineering, understanding various terms is crucial for effective communication and operation. One such term is upper dead center, which refers to a specific position in the cycle of a reciprocating engine or piston. This term is often abbreviated as UDC and plays a significant role in the functioning of engines, particularly in terms of efficiency and power generation.To comprehend the significance of upper dead center, we must first understand the basic workings of an internal combustion engine. An engine operates on the principle of converting fuel into mechanical energy through a series of controlled explosions. The piston moves up and down within the cylinder, and its position at any given time is critical to the engine's performance. The upper dead center is the point at which the piston is at its highest position within the cylinder, and it marks the end of the compression stroke and the beginning of the power stroke.At this point, the air-fuel mixture has been compressed to its maximum density, and the spark plug ignites the mixture, causing an explosion that forces the piston downward. This downward movement generates the power needed to turn the crankshaft and ultimately drive the vehicle. If the piston does not reach the upper dead center, the engine may not function efficiently, leading to a loss of power and increased fuel consumption.The concept of upper dead center is not only vital for understanding engine mechanics but also has implications for engine tuning and performance optimization. Engineers often adjust various parameters, such as ignition timing and valve lift, based on the position of the piston relative to the upper dead center. By fine-tuning these settings, they can improve the engine's responsiveness and overall efficiency.Moreover, the upper dead center is essential when considering engine wear and tear. When an engine is turned off, the pistons naturally settle into a position that is not necessarily at the upper dead center. This can lead to uneven wear on the piston rings and cylinder walls over time. Therefore, understanding the positioning of the piston in relation to the upper dead center can help engineers design better lubrication systems and maintenance schedules to prolong engine life.In conclusion, the term upper dead center is fundamental in the field of engine mechanics. It represents a critical moment in the engine's cycle that affects performance, efficiency, and longevity. By grasping the concept of upper dead center, one can appreciate the intricate dance of components within an engine and the importance of precision in engineering. Whether you are a student of mechanical engineering, a car enthusiast, or simply someone interested in how things work, understanding this term will enhance your knowledge and appreciation of internal combustion engines.

在机械和工程的世界中，理解各种术语对于有效的沟通和操作至关重要。其中一个术语是上止点，它指的是往复发动机或活塞循环中的特定位置。这个术语通常缩写为UDC，并在发动机的功能中起着重要作用，特别是在效率和动力生成方面。要理解上止点的重要性，我们必须首先了解内燃机的基本工作原理。发动机的工作原理是通过一系列受控的爆炸将燃料转化为机械能。活塞在气缸内上下移动，其在任何给定时刻的位置对发动机的性能至关重要。上止点是活塞在气缸内处于最高位置的点，它标志着压缩行程的结束和动力行程的开始。在这一点上，空气-燃料混合物已被压缩到最大密度，火花塞点燃混合物，导致爆炸，迫使活塞向下移动。这种向下的运动产生了驱动曲轴所需的动力，从而最终驱动车辆。如果活塞未能达到上止点，发动机可能无法高效运行，导致动力损失和燃料消耗增加。上止点的概念不仅对理解发动机机械学至关重要，而且对发动机调校和性能优化也有影响。工程师们通常根据活塞相对于上止点的位置调整各种参数，如点火时机和气门升程。通过微调这些设置，他们可以提高发动机的响应性和整体效率。此外，上止点在考虑发动机磨损时也是必不可少的。当发动机关闭时，活塞自然会沉降到一个不一定位于上止点的位置。这可能导致活塞环和气缸壁随着时间的推移而不均匀磨损。因此，理解活塞相对于上止点的位置可以帮助工程师设计更好的润滑系统和维护计划，以延长发动机寿命。总之，术语上止点在发动机机械领域是基础性的。它代表了发动机循环中的一个关键时刻，影响着性能、效率和耐久性。通过掌握上止点的概念，人们可以欣赏到发动机内部组件之间复杂的配合舞蹈以及工程精度的重要性。无论你是机械工程的学生、汽车爱好者，还是仅仅对事物的工作原理感兴趣的人，理解这个术语都会增强你对内燃机的知识和欣赏。