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Eccentric Loading01:16

Eccentric Loading

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Eccentric loading is a crucial concept in the study of structural engineering and mechanics, particularly when analyzing the stability and stress distribution in columns. Unlike centric loading, where the force is applied along the centroidal axis, causing uniform compression, eccentric loading occurs when a force is applied off-center. This off-center application introduces not only direct compressive stress but also bending stress, significantly influencing the column's behavior under...
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A spherical capacitor consists of two concentric conducting spherical shells of radii R1 (inner shell) and R2 (outer shell). The shells have  equal and opposite charges of +Q and −Q, respectively. For an isolated conducting spherical capacitor, the radius of the outer shell can be considered to be infinite.
Conventionally, considering the  symmetry, the electric field between the concentric shells of a spherical capacitor is directed radially outward. The magnitude of the field,...
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Capacitor With A Dielectric01:18

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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
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A Gesture-Controlled Rehabilitation Robot to Improve Engagement and Quantify Movement Performance.

Sensors (Basel, Switzerland)·2020
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Related Experiment Video

Updated: Jun 21, 2025

Introducing an Angle Adjustable Cutting Box for Analyzing Slice Shear Force in Meat
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Conforming Capacitive Load Cells for Conical Pick Cutters.

Austin F Oltmanns1, Andrew J Petruska1

  • 1Mechanical Engineering, Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, USA.

Sensors (Basel, Switzerland)
|July 13, 2024
PubMed
Summary

A new cutting force sensor for underground coal mining improves operator safety by measuring forces remotely. This sensor enables real-time assessment of tool wear and material type, enhancing operational efficiency.

Keywords:
air-gap capacitive sensorcapacitive load cellconforming sensorconical picksforce sensorunderground coal mining

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Last Updated: Jun 21, 2025

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Area of Science:

  • Mining Engineering
  • Sensor Technology
  • Machine Safety

Background:

  • Underground coal mining operators face risks when monitoring machinery near the cutting face.
  • Improving operator safety and machine efficiency is crucial in mining operations.

Purpose of the Study:

  • To develop and evaluate a novel cutting force sensor for underground coal mining applications.
  • To enhance operator safety and efficiency by enabling remote monitoring of cutting forces.

Main Methods:

  • A linear cutting machine simulated coal mining using concrete-cast coal samples and conical pick cutters.
  • A cutting force sensor utilizing resonant frequency of capacitive cells was developed and tested.
  • Linear and neural network regression models were employed to analyze sensor data from 100 test/train splits.

Main Results:

  • The sensor accurately tracked normal force on conical picks, achieving a mean absolute error under 6 kN with linear regression (R2 > 0.60).
  • A neural network model improved accuracy to a mean absolute error under 4 kN (R2 ≈ 0.80).
  • The sensor demonstrated increased stiffness and sensitivity when integrated into the cutting tooling.

Conclusions:

  • The developed cutting force sensor shows promise for improving safety and efficiency in underground coal mining.
  • Objective force measurements can allow operators to assess tool wear and material type remotely.
  • This technology can reduce operator proximity to hazardous cutting interfaces.