upper dead center

简明释义

上死点

英英释义

例句

1.The mechanic explained that the crankshaft rotates 180 degrees from upper dead center 上死点 to lower dead center.

机械师解释说，曲轴从上死点旋转180度到下死点。

2.The piston reached the upper dead center 上死点 during the compression stroke.

活塞在压缩行程中达到了上死点。

3.When tuning the engine, it's crucial to check if the timing is set correctly at upper dead center 上死点.

在调校发动机时，检查时机是否在上死点正确设置是至关重要的。

4.To prevent engine knocking, make sure the spark plug fires just after upper dead center 上死点.

为了防止发动机敲击，确保火花塞在上死点后立即点火。

5.In a two-stroke engine, the intake occurs just before reaching upper dead center 上死点.

在二冲程发动机中，进气发生在接近上死点之前。

作文

The concept of upper dead center is fundamental in the field of mechanics, particularly in the study of engines and mechanical systems. To fully understand this term, we must first delve into the basic principles of motion and energy transfer. In simple terms, upper dead center refers to the position of a piston in an internal combustion engine when it reaches its highest point in the cylinder. This position is crucial because it marks the end of the compression stroke and the beginning of the power stroke. Understanding this position can help us appreciate how engines convert fuel into mechanical energy.When the piston is at upper dead center, the air-fuel mixture has been compressed to its maximum density. This compression is vital for efficient combustion, as it allows for a more powerful explosion when the spark plug ignites the mixture. If the piston were to be positioned lower in the cylinder, the mixture would not be as dense, leading to less efficient combustion and reduced power output.In addition to its significance in combustion engines, the term upper dead center also appears in various mechanical applications. For instance, in the context of a crankshaft, the upper dead center is the point where the crankpin is positioned at the highest point relative to the main bearing. This positioning affects the timing and efficiency of the entire mechanical system. Engineers must carefully consider the implications of upper dead center when designing machines to ensure optimal performance.Moreover, the understanding of upper dead center is not limited to just engines. It is also relevant in fields such as robotics, where precise movements are crucial. Robots often rely on actuators that mimic the motion of pistons and other mechanical components. Knowing the exact position of these components, including upper dead center, allows for better control and programming of robotic movements.In practical applications, mechanics often use tools like oscilloscopes and pressure sensors to measure the performance of engines and other machinery. By analyzing data collected at upper dead center, engineers can identify inefficiencies or potential issues within the system. For example, if the pressure at upper dead center is lower than expected, it may indicate a problem with the engine's compression ratio or a leak in the cylinder. Addressing these issues promptly can lead to improved performance and longevity of the equipment.In conclusion, the term upper dead center plays a pivotal role in mechanical engineering and related fields. Its implications extend beyond just internal combustion engines, influencing the design and function of various mechanical systems. By grasping the concept of upper dead center, one can gain valuable insights into the workings of engines, robotics, and other machinery. As technology continues to advance, the importance of understanding such fundamental concepts will only grow, making it essential for engineers and technicians alike to master the intricacies of upper dead center and its applications in real-world scenarios.

“上死点”这个概念在机械领域，特别是在研究发动机和机械系统时，是基础性的。要充分理解这个术语，我们首先需要深入探讨运动和能量传递的基本原理。简单来说，上死点指的是内燃机中活塞在气缸内达到最高点时的位置。这个位置至关重要，因为它标志着压缩行程的结束和动力行程的开始。理解这个位置可以帮助我们欣赏发动机如何将燃料转化为机械能。当活塞处于上死点时，空气-燃料混合物已被压缩到其最大密度。这种压缩对于高效燃烧至关重要，因为它允许在火花塞点燃混合物时产生更强大的爆炸。如果活塞位于气缸的较低位置，混合物就不会那么密集，导致燃烧效率降低和功率输出减少。除了在内燃机中的重要性，上死点这个术语在各种机械应用中也会出现。例如，在曲轴的上下文中，上死点是曲柄销相对于主轴承处于最高点的位置。这个位置影响整个机械系统的时序和效率。工程师在设计机器时必须仔细考虑上死点的影响，以确保最佳性能。此外，理解上死点不仅限于发动机。在机器人学等领域也很相关，精确的运动至关重要。机器人通常依赖于模仿活塞和其他机械部件运动的执行器。了解这些部件的确切位置，包括上死点，可以更好地控制和编程机器人的运动。在实际应用中，机械师经常使用示波器和压力传感器来测量发动机和其他机械设备的性能。通过分析在上死点收集的数据，工程师可以识别系统中的低效或潜在问题。例如，如果在上死点的压力低于预期，这可能表明发动机的压缩比存在问题或气缸有泄漏。及时解决这些问题可以提高设备的性能和使用寿命。总之，上死点这个术语在机械工程及相关领域发挥着关键作用。它的影响不仅限于内燃机，还影响着各种机械系统的设计和功能。通过掌握上死点的概念，人们可以获得对发动机、机器人和其他机械设备运作的宝贵见解。随着技术的不断进步，理解这些基本概念的重要性只会增加，因此工程师和技术人员都应掌握上死点及其在实际场景中的应用的复杂性。