outer dead point

简明释义

外死点

英英释义

例句

1.The outer dead point is crucial for setting the ignition timing correctly.

外死点对于正确设置点火时机至关重要。

2.In a two-stroke engine, the outer dead point can affect the power output significantly.

在二冲程发动机中，外死点会显著影响功率输出。

3.During the test, we observed that the crankshaft stopped rotating at the outer dead point.

在测试过程中，我们观察到曲轴在外死点停止旋转。

4.To adjust the timing, we need to find the outer dead point of the engine.

为了调整时机，我们需要找到发动机的外死点。

5.The technician explained that the engine reaches its outer dead point when the piston is at its highest position.

技术人员解释说，当活塞达到最高位置时，发动机达到了外死点。

作文

In the realm of mechanics and engineering, the term outer dead point refers to a specific position in the motion of a mechanism where the velocity is momentarily zero. This concept is particularly significant in the study of engines and various mechanical systems that involve rotating parts. Understanding the outer dead point is crucial for engineers and designers as it plays a vital role in the efficiency and performance of machines.When a piston in an engine reaches the outer dead point, it signifies the end of its travel in one direction before it begins to move back. This point is critical because it represents the position where the engine's power stroke begins or ends, depending on whether we are discussing the top dead center or bottom dead center. The outer dead point is often associated with the maximum displacement of the piston, which is essential for the effective operation of internal combustion engines.To illustrate this further, let’s consider a four-stroke engine. In this type of engine, the cycle consists of intake, compression, power, and exhaust strokes. During the power stroke, the piston moves downwards, and when it reaches the outer dead point, it has completed its downward travel. At this moment, the fuel-air mixture ignites, creating a force that pushes the piston back up. If the timing of this ignition is not perfectly synchronized with the position of the piston at the outer dead point, it can lead to inefficient combustion and reduced engine performance.Moreover, the outer dead point is not limited to just pistons in engines; it can also apply to various other mechanical systems, such as crankshafts and camshafts. For instance, in a crankshaft, the outer dead point is the position where the connecting rod is aligned vertically with the crank pin, resulting in no rotational movement for that instant. This understanding is crucial for designing systems that require precise timing and synchronization.In practical applications, engineers often use sensors and computer simulations to monitor the position of components relative to the outer dead point. This data helps in optimizing performance, enhancing fuel efficiency, and reducing emissions in automotive engines. Furthermore, advancements in technology have allowed for the development of variable valve timing systems, which adjust the timing of the valves based on the position of the piston relative to the outer dead point. This innovation improves engine responsiveness and overall performance.In conclusion, the concept of the outer dead point is fundamental in the field of mechanical engineering. It serves as a critical reference point in the design and functioning of various mechanical systems, especially in engines. By grasping the significance of the outer dead point, engineers can enhance the performance and efficiency of machines, leading to advancements in technology and engineering practices. As we continue to innovate and improve our mechanical systems, the understanding of such concepts will remain pivotal in driving future developments.

在机械和工程领域，术语outer dead point指的是机制运动中的一个特定位置，在该位置，速度暂时为零。这个概念在发动机和各种涉及旋转部件的机械系统的研究中尤为重要。理解outer dead point对工程师和设计师至关重要，因为它在机器的效率和性能中起着关键作用。当发动机中的活塞达到outer dead point时，这标志着它在一个方向上的移动结束，然后开始向回移动。这个点是关键的，因为它代表着发动机动力冲程开始或结束的位置，具体取决于我们讨论的是上止点还是下止点。outer dead point通常与活塞的最大位移相关，这对于内燃机的有效运行至关重要。为了进一步说明这一点，让我们考虑一个四冲程发动机。在这种类型的发动机中，循环包括进气、压缩、动力和排气冲程。在动力冲程期间，活塞向下移动，当它到达outer dead point时，它已经完成了向下的移动。在这一刻，燃油-空气混合物点燃，产生的力量将活塞推回上方。如果点火的时机没有与活塞在outer dead point处的位置完美同步，就会导致燃烧效率低下和发动机性能下降。此外，outer dead point不仅限于发动机中的活塞；它也可以应用于其他各种机械系统，如曲轴和凸轮轴。例如，在曲轴中，outer dead point是连杆与曲柄销垂直对齐的位置，此时没有旋转运动。这种理解对于设计需要精确时序和同步的系统至关重要。在实际应用中，工程师通常使用传感器和计算机模拟来监测组件相对于outer dead point的位置。这些数据有助于优化性能，提高燃油效率，并减少汽车发动机的排放。此外，技术的进步使可变气门正时系统的发展成为可能，这种系统根据活塞相对于outer dead point的位置调整阀门的时机。这一创新提高了发动机的响应性和整体性能。总之，outer dead point的概念在机械工程领域是基础性的。它作为各种机械系统设计和功能的重要参考点，尤其是在发动机中。通过掌握outer dead point的重要性，工程师可以提升机器的性能和效率，从而推动技术和工程实践的发展。随着我们继续创新和改进机械系统，对这些概念的理解将继续在推动未来发展中发挥关键作用。