相关概念视频
01:20Mechanisms of Heat Transfer II
4.2K
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
4.2K
01:27Thermal expansion and Thermal stress: Problem Solving
2.1K
San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
2.1K
01:14Mechanisms of Heat Transfer
1.6K
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
1.6K
01:19Mechanism of heat transfer
1.9K
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
1.9K
01:14Mechanisms of Heat Transfer I
5.9K
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
5.9K
01:09Thermal Stress
3.3K
If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
3.3K
您也可能阅读
相关文章
通过共同作者、期刊和引用图与本文相关的文章。
排序
智能软传感器用于螺丝轴对流传热传递系数在不同的操作条件下使用改进的灰狼优化算法.
1College of Electrical and Control Engineering, Shenyang Jianzhu University, Shenyang 110168, China.
Sensors (Basel, Switzerland)
|September 27, 2025
概括
这项研究引入了一种使用多传感器数据和改进的灰狼优化算法的新方法,以准确测量CNC机床轴中的对流热传递系数 (CHTC). 这提高了热分析和机器准确度.
科学领域:
- 机械工程 机械工程
- 热分析 热分析
- 计算智能是一种计算智能.
背景情况:
- 高精度CNC机床中的热变形限制了加工精度.
- 精确地描述线的热特性,特别是对流传热传递系数 (CHTC),至关重要,但由于测量难度,具有挑战性.
研究的目的:
- 开发一种创新的方法,用于精确识别CNC机床轴中的CHTC.
- 为了克服直接CHTC测量仪器的局限性.
- 改进热分析和对机床热误差的补偿.
主要方法:
- 实施分布式温度监测网络,用于实时采集热场数据.
- 应用一个改进的灰狼优化 (IGWO) 算法与适应性重量调整用于动态CHTC识别.
- 集成多传感器数据与智能优化算法.
主要成果:
- 与传统方法相比, IGWO 提出的方法在温度预测方面表现出更高的准确性.
- 在广泛的操作范围内实现了有效的CHTC动态和准确的识别.
- 该方法在动态操作条件下被证明是可靠的.
结论:
