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Related Concept Videos

Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
Fluid Pressure over Flat Plate of Constant Width01:05

Fluid Pressure over Flat Plate of Constant Width

When a body is submerged in water, it experiences fluid pressure acting normal on its surface and distributed over its area. For better design structures, it is crucial to determine the magnitude and location of the resultant force acting on the surface. In the case of a rectangular plate of constant width submerged in water, the pressure increases with depth, resulting in a linearly varying trapezoidal pressure distribution from the upper to the lower edge of the plate.
The resultant force...
Fluid Pressure over Flat Plate of Variable Width01:02

Fluid Pressure over Flat Plate of Variable Width

When a flat plate is submerged in a fluid, the fluid exerts pressure on the plate. This pressure can lead to many different phenomena, including drag and buoyancy. To understand the behavior of the fluid over a flat plate of variable width, it is essential to analyze the distribution of the pressure exerted.
The pressure distribution on the plate can be calculated by determining the force that acts on a differential area strip of the plate. Thus, the magnitude of the force is equal to the...
Fluid Pressure over Curved Plate of Constant Width01:12

Fluid Pressure over Curved Plate of Constant Width

When a curved plate of constant width is submerged in a liquid, the pressure acting normal to the plate varies continuously both in magnitude and direction. Calculating the magnitude and location of the resultant force at a point is often challenging for such cases. One of the methods to determine the resultant force and its location involves separately calculating the horizontal and vertical components of the resultant force. This complex calculation can be simplified by representing the...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to the...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...

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Related Experiment Video

Updated: Jun 15, 2026

Measurement of Chladni Mode Shapes with an Optical Lever Method
04:39

Measurement of Chladni Mode Shapes with an Optical Lever Method

Published on: June 5, 2020

Time-average reflection-moiré method for vibration analysis of plates.

F P Chiang, C J Lin

    Applied Optics
    |March 10, 2010
    PubMed
    Summary

    A novel moiré method captures time-average slope contours of vibrating plates. This technique simplifies stress calculations by requiring only first-order differentiation of experimental data.

    Area of Science:

    • Mechanical Engineering
    • Experimental Mechanics
    • Materials Science

    Background:

    • Vibrating plates are crucial in various engineering applications.
    • Accurate stress analysis in dynamic systems is essential for design and safety.
    • Existing methods for analyzing vibrating plates can be complex, often requiring higher-order differentiation.

    Purpose of the Study:

    • To introduce a new moiré interferometry method for analyzing vibrating plates.
    • To demonstrate the method's ability to obtain time-average slope contours.
    • To highlight the simplified data processing requirements for stress calculations.

    Main Methods:

    • Development of a specialized moiré setup for time-average measurements.
    • Application of the moiré method to vibrating plate specimens.

    More Related Videos

    Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
    06:56

    Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes

    Published on: May 23, 2017

    High-speed Particle Image Velocimetry Near Surfaces
    11:59

    High-speed Particle Image Velocimetry Near Surfaces

    Published on: June 24, 2013

    Related Experiment Videos

    Last Updated: Jun 15, 2026

    Measurement of Chladni Mode Shapes with an Optical Lever Method
    04:39

    Measurement of Chladni Mode Shapes with an Optical Lever Method

    Published on: June 5, 2020

    Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
    06:56

    Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes

    Published on: May 23, 2017

    High-speed Particle Image Velocimetry Near Surfaces
    11:59

    High-speed Particle Image Velocimetry Near Surfaces

    Published on: June 24, 2013

  • Experimental data acquisition and analysis focusing on slope contours.

    • Main Results:

    • Successful generation of time-average slope contours from vibrating plates.
    • Demonstration that the moiré method yields first-order slope data directly.
    • Validation of the method's efficiency compared to deflection contouring techniques.

    Conclusions:

    • The described moiré method offers an advantageous approach for analyzing vibrating plates.
    • Simplified stress calculations are possible due to the direct acquisition of slope data.
    • This technique enhances the practicality of experimental stress analysis in dynamic scenarios.