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Related Concept Videos

Torque01:10

Torque

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Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...
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Net Torque Calculations01:19

Net Torque Calculations

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When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to...
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Screw: Problem Solving01:21

Screw: Problem Solving

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In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
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Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the...
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Design of Transmission Shafts01:16

Design of Transmission Shafts

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The design of a transmission shaft is governed by two primary specifications: the power it transmits and its rotational speed. These parameters guide the selection of the shaft's material and cross-sectional dimensions, ensuring that the material's maximum shearing stress remains within the elastic limit while transmitting the desired power at the given speed. The system's power is intrinsically linked to the applied torque. The torque applied to the shaft can be calculated by reconfiguring the...
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Transmission Shafts: Problem Solving01:09

Transmission Shafts: Problem Solving

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Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
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A Rapid Method for Modeling a Variable Cycle Engine
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Research on intelligent assembly method of aero-engine deep-cavity nuts based on torque-angle control.

Zhenyu Liu1, Xiaodong Huang2, Jianrong Tan1

  • 1Department of Mechanical Engineering, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310058, Zhejiang, China.

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|March 2, 2026
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Summary

High-torque nut assembly in aero-engines is optimized using fractal mechanics and a visual servo system. This ensures precise angular accuracy and stable preload control, enhancing engine reliability and assembly efficiency.

Keywords:
Aero-engineAutomation assemblyDeep-cavity nutTorque-angle controlVisual tightening system

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Area of Science:

  • Aerospace Engineering
  • Mechanical Engineering
  • Materials Science

Background:

  • Aero-engine low-pressure rotor high-torque nut assembly is critical for operational reliability.
  • Deep cavity assembly presents challenges in meeting torque, angular accuracy, and preload control requirements.

Purpose of the Study:

  • To develop an optimized assembly method for high-torque nuts in aero-engine rotors.
  • To create a visual tightening system integrating monitoring and servo control for improved assembly quality.

Main Methods:

  • Integration of fractal contact mechanics (Weierstrass-Mandelbrot function) and multi-physics coupling.
  • Development of a visual tightening system with servo control.
  • Establishment of a thread stiffness model and use of ANSYS simulations for thermal-centrifugal coupling analysis.

Main Results:

  • Surface roughness (Ra=1.6 μm) limits real contact area to 12%-18%.
  • Thread stiffness model shows <1% error; simulations quantify preload attenuation.
  • Developed system achieves [Formula: see text] angular accuracy and controls preload error within [Formula: see text].

Conclusions:

  • The optimized method and visual tightening system meet stringent aero-engine assembly requirements.
  • Assembly time reduced by 35% (from 4 to 2.6 h) with improved efficiency and collision avoidance.
  • Enhanced system ensures high-reliability assembly for aero-engine operational safety.