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Related Concept Videos

Rolling Resistance: Problem Solving01:17

Rolling Resistance: Problem Solving

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Rolling resistance, also known as rolling friction, is the force that resists the motion of a rolling object, such as a wheel, tire, or ball, when it moves over a surface. It is caused by the deformation of the object and the surface in contact with each other, as well as other factors like internal friction, hysteresis, and energy losses within the materials. Rolling resistance opposes the object's motion, requiring additional energy to overcome it and maintain movement. In practical...
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Rolling Resistance01:21

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When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down due to...
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People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is...
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Design of Transmission Shafts01:16

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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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Bearings: Problem Solving01:24

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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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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...
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Related Experiment Video

Updated: Mar 18, 2026

Simulation of a Scaled Assembly Process with Collaboration of a Robotic Arm and Monitoring through a Vision System for Quality Control
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Simulation of a Scaled Assembly Process with Collaboration of a Robotic Arm and Monitoring through a Vision System for Quality Control

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Integrated forward and reverse supply chain: A tire case study.

Ali Pedram1, Nukman Bin Yusoff1, Olugu Ezutah Udoncy2

  • 1Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia.

Waste Management (New York, N.Y.)
|July 14, 2016
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Summary

This study introduces a closed-loop supply chain (CLSC) network model to maximize profit and minimize pollution. Scenario analysis addresses uncertainties in demand and product returns, demonstrating applicability in the tire industry for waste reduction.

Keywords:
Closed-loop supply chainNetwork designReverse logisticsWaste management

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Area of Science:

  • Operations Research
  • Environmental Management
  • Industrial Engineering

Background:

  • Designing effective supply chains is challenged by uncertainties in demand and product returns.
  • Existing models often overlook the integration of forward and reverse logistics for sustainability.
  • Waste reduction and pollution minimization are critical goals in modern supply chain management.

Purpose of the Study:

  • To develop an integrated closed-loop supply chain (CLSC) network model.
  • To address and overcome uncertainties in demand, product returns, and return product quality.
  • To provide decision support for waste management and pollution minimization while maximizing profit.

Main Methods:

  • Development of a multi-product, multi-tier mixed integer linear programming model.
  • Integration of forward and reverse logistics within a single network design.
  • Utilization of scenario analysis to manage uncertainties inherent in CLSC operations.

Main Results:

  • The proposed CLSC network model effectively maximizes profit.
  • The model provides robust decision support for waste management and pollution reduction.
  • Demonstrated applicability and effectiveness of the model within the tire industry.

Conclusions:

  • The integrated CLSC network design is a viable strategy for enhancing profitability and environmental performance.
  • Scenario analysis is crucial for mitigating risks associated with demand and return uncertainties in CLSCs.
  • The developed model offers a comprehensive framework for optimizing facility location and material flow in closed-loop systems.