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Related Concept Videos

Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

1.0K
The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
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Pressure Gauges01:20

Pressure Gauges

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Most pressure gauges, like those on scuba tanks, are calibrated to read zero at atmospheric pressure. Readings from such gauges are called the gauge pressure, which is the pressure relative to atmospheric pressure. When the pressure inside the tank exceeds atmospheric pressure, the gauge reports a positive value. Some gauges are designed to measure negative pressure. For example, many physics experiments must take place in a vacuum chamber, a rigid chamber from which some of the air is pumped...
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Multi-input and Multi-variable systems01:22

Multi-input and Multi-variable systems

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Cruise control systems in cars are designed as multi-input systems to maintain a driver's desired speed while compensating for external disturbances such as changes in terrain. The block diagram for a cruise control system typically includes two main inputs: the desired speed set by the driver and any external disturbances, such as the incline of the road. By adjusting the engine throttle, the system maintains the vehicle's speed as close to the desired value as possible.
In the absence of...
427
Thermal Strain01:19

Thermal Strain

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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Shearing Strain01:20

Shearing Strain

1.4K
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
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Measurements of Strain01:27

Measurements of Strain

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Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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Production of a Strain-Measuring Device with an Improved 3D Printer
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A New Input Device for Spastics Based on Strain Gauge.

Niels Buchhold1, Christian Baumgartner2

  • 1Institute of Health Care Engineering with European Testing and Certification Body of Medical Devices, Graz University of Technology, Stremayrgasse 16/II, 8010 Graz, Austria. 0603591990@t-online.de.

Sensors (Basel, Switzerland)
|April 20, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces a new strain gauge sensor designed for individuals with spastic disorders, offering safer control of medical devices like electric wheelchairs. The adaptive, flat disc sensor prevents dangerous situations during involuntary movements.

Keywords:
assistive technologiesjoystickmedical systemspower wheelchairroboticspasticspasticitystrain-gaugetactile sensors

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Area of Science:

  • Biomedical Engineering
  • Rehabilitation Technology
  • Human-Computer Interaction

Background:

  • Spastic disorders can cause uncontrollable extremity cramping, posing significant risks when operating standard electric wheelchairs with joysticks.
  • Existing control methods for powered mobility devices may be unsafe for individuals experiencing involuntary muscle spasms.
  • The need for adaptive and safe control interfaces for individuals with neuromuscular conditions is critical.

Purpose of the Study:

  • To develop and present a novel sensor system for enhanced control of medical devices, specifically electric wheelchairs, for individuals with spastic disorders.
  • To mitigate the risks associated with involuntary spasms during operation of powered mobility devices.
  • To create an adaptive and safe user interface that accommodates varying user abilities and movement patterns.

Main Methods:

  • A new sensor was designed using strain gauges, featuring a flat disc shape for versatile operation by any body part.
  • The sensor utilizes weight shifting along the x- and y-axes for proportional control and downward pressure (z-axis) for additional functions.
  • The sensor's design allows body parts to slide over it during spasms, preventing entrapment and unintended actions, and is adjustable for individual needs.

Main Results:

  • The developed strain gauge sensor provides proportionate output signals based on applied pressure and tilt.
  • Its flat, disc-like construction and adjustable nature minimize the risk of injury or unintended control during spastic episodes.
  • The sensor demonstrated adaptability to different user strengths and ranges of motion, enhancing safe operation.

Conclusions:

  • The novel strain gauge sensor offers a safer and more adaptive control solution for electric wheelchairs and similar medical devices for individuals with spastic disorders.
  • This innovation addresses the critical safety concerns posed by involuntary spasms, improving user independence and device operability.
  • The sensor's design facilitates intuitive control while minimizing risks, paving the way for improved assistive technology.