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Related Concept Videos

Bearings: Problem Solving01:24

Bearings: Problem Solving

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Understanding the calculations and concepts related to double-collar bearings is essential for engineers and designers to optimize the performance of these components in various applications. By analyzing the bearing under different conditions, one can ensure that it can withstand the forces and moments experienced during operation. This knowledge enables better decision-making when designing and selecting bearings for specific purposes and configurations. Consider a double-collar bearing with...
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Thin-Walled Hollow Shafts01:15

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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
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Bearing stress refers to the contact pressure between two separate bodies. To visualize this, imagine a bolt thrust through a plate. The bolt applies a force to the plate, which exerts an equal but opposite force back onto the bolt. This force isn't just a singular entity but a compilation of numerous smaller forces distributed across the contact surface between the bolt and the plate.
Due to the intricacy of these microforces, an average value, known as bearing stress, is often used by...
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Thermal expansion and Thermal stress: Problem Solving01:27

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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?
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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...
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Thermal Stress01:09

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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...
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Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment
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Transient Thermal Analysis Model of Damaged Bearing Considering Thermo-Solid Coupling Effect.

Yali Sun1, Chong Zhang1, Xing Zhao2

  • 1College of Mechanical Engineering, Dalian Jiaotong University; Dalian 116028, China.

Sensors (Basel, Switzerland)
|November 11, 2022
PubMed
Summary

This study introduces a new model for analyzing damaged bearing temperature variations. The developed model accurately predicts bearing temperature changes and thermal equilibrium under operational conditions.

Keywords:
bearing fault diagnosisheat generation and transferthermal-solid couplingtransient thermal model

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Area of Science:

  • Mechanical Engineering
  • Tribology
  • Thermal Analysis

Background:

  • Bearing temperature is critical for diagnosing operational status.
  • Existing models for damaged bearing temperature variations have limitations.

Purpose of the Study:

  • To establish a novel transient temperature analysis model for damaged bearings.
  • To investigate the thermal-solid coupling effect on bearing structures.
  • To analyze the influence of operational parameters on bearing temperature.

Main Methods:

  • Quasi-static analysis to determine parameter variations under thermal expansion.
  • Analysis of load variation in damaged bearings.
  • Study of heat generation and transfer in damaged bearings.
  • Development of a transient temperature model using the thermal grid method.

Main Results:

  • Experimental validation of the developed transient temperature model.
  • Analysis of the impact of rotational speed and load on bearing temperature.
  • Demonstrated effectiveness of the model in predicting temperature variations and thermal equilibrium.

Conclusions:

  • The novel transient temperature analysis model accurately predicts the behavior of damaged bearings.
  • The model accounts for thermal-solid coupling effects, improving accuracy.
  • Operational parameters significantly influence bearing temperature dynamics.