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Related Concept Videos

Measurement of Fluid Pressure01:16

Measurement of Fluid Pressure

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Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...
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Magnetic Damping01:17

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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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Updated: Jan 5, 2026

Experiments on Ultrasonic Lubrication Using a Piezoelectrically-assisted Tribometer and Optical Profilometer
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Vibration Viscosity Sensor for Engine Oil Monitoring Using Metal Matrix Piezoelectric Composite.

Tetsuro Yanaseko1, Hiroshi Sato2, Isao Kuboki3

  • 1Department of Mechanical Engineering, Kogakuin University, 2665-1, Nakano-cho, Hachioji-shi, Tokyo 192-0015, Japan. yanaseko@cc.kogakuin.ac.jp.

Materials (Basel, Switzerland)
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A new sensor using a metal-core piezoelectric fiber/aluminum composite effectively monitors engine oil viscosity. This advancement aids in machine maintenance by detecting lubricant deterioration in harsh environments.

Keywords:
active sensormetal matrix compositepiezoelectric compositesmart materialsviscosity

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Sensor Technology

Background:

  • Lubricating oils are crucial for preventing machine wear and damage.
  • Monitoring lubricant deterioration is vital for effective machine maintenance.
  • Harsh environments, like inside engines, pose challenges for sensor durability.

Purpose of the Study:

  • To develop a novel sensor for monitoring engine oil viscosity.
  • To utilize a metal-core piezoelectric fiber/aluminum composite for sensor fabrication.
  • To assess the sensor's viability for real-time engine oil monitoring.

Main Methods:

  • A metal-core piezoelectric fiber/aluminum composite was fabricated.
  • An active type measurement method was employed using glycerin solution as a model.
  • Self-generated vibration was correlated to liquid viscosity by measuring damped amplitude and resonance frequency shifts.

Main Results:

  • The developed sensor demonstrated high sensitivity to liquid viscosity.
  • Resonance frequency shifts showed correlation with a wider range of measurable viscosity.
  • The composite material proved suitable for sensor applications in demanding conditions.

Conclusions:

  • The metal-core piezoelectric fiber/aluminum composite sensor is a viable tool for engine oil viscosity monitoring.
  • This technology offers a promising solution for proactive machine maintenance.
  • The sensor's robustness makes it suitable for in-situ monitoring within engines.