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相关概念视频

Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

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In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
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Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

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One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
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Heat Engines01:10

Heat Engines

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A heat engine is a device used to extract heat from a source and then convert it into mechanical work used for various applications. For example, a steam engine on an old-style train can produce the work needed for driving the train.
Whenever we consider heat engines (and associated devices such as refrigerators and heat pumps), we do not use the standard sign convention for heat and work. For convenience, we assume that the symbols Qh, Qc, and W represent only the amounts of heat transferred...
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Design of Transmission Shafts - Stress Analysis01:15

Design of Transmission Shafts - Stress Analysis

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Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
409
Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

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The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
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Wind Turbine Machine Models01:24

Wind Turbine Machine Models

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In the growing field of wind energy, incorporating wind turbine models into transient stability analysis is essential. Induction and synchronous machines are the primary models used, with induction machines being prevalent due to their simplicity and reliability.
Induction machines interact through the rotating magnetic field generated by the stator and the rotor. The key parameter is slip, which is the difference between synchronous speed and rotor speed relative to synchronous speed. Slip is...
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相关实验视频

Updated: Jul 27, 2025

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
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航空发动机叶片冷制冷削变形模拟和过程参数优化

Ting Chen1, Yun Xu1, Bo Huang1

  • 1School of Mechanical Engineering, Sichuan University of Science and Engineering, Zigong 643000, China.

Materials (Basel, Switzerland)
|June 10, 2023
PubMed
概括

低温削显著减少了超过31.36%的航空发动机叶片变形. 使用粒子群算法的优化参数确保在允许的误差范围内确保叶片配置的准确性.

关键词:
飞机发动机刀片 飞机发动机刀片制冷机械加工 制冷机械加工粒子群算法 粒子群算法模拟器模拟器模拟器模拟器的是什么 的是什么

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科学领域:

  • 制造业 工程 制造工程
  • 材料科学 材料科学 材料科学
  • 航空航天工程 航空航天工程

背景情况:

  • 航空发动机叶片加工面临着残余应力,削力和热变形影响形状精度的挑战.
  • 精确的叶片形状对于发动机性能和寿命至关重要.

研究的目的:

  • 为了研究冷加工和工艺参数对航空发动机叶片变形的影响.
  • 开发预测模型并优化加工参数,以提高刀片形状的准确性.

主要方法:

  • 使用DEFORM 11.0和ABAQUS 2020进行模拟,分析热力场和叶片变形.
  • 实验的设计包括单因素控制和参数分析的盒式设计 (BBD).
  • 应用多重二次回归和粒子群优化 (PSO) 算法进行参数优化.

主要成果:

  • 与干 (10 °C至20 °C) 相比,低温削 (-190 °C至-10 °C) 减少了超过31.36%的变形率.
  • 最初的优化尝试显示了刀片的轮边缘超过±50μm的公差.
  • 通过PSO算法的优化,在-160°C至-180°C范围内实现了0.0396mm的最大变形,满足了准确性要求.

结论:

  • 低温削是减少机械加工过程中航空发动机叶片变形的有效策略.
  • 数学建模和基于PSO的优化成功确定了过程参数,以确保高叶片配置精度.
  • 优化的低温削工艺满足了刀片形状的严格的航空航天制造公差.