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Related Concept Videos

Impact01:30

Impact

Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
Impact Loading01:19

Impact Loading

Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used to...
Impact Loading on a Cantilever Beam01:13

Impact Loading on a Cantilever Beam

The analysis of a cantilever beam with a circular cross-section subjected to impact loading at its free end illustrates the conversion of potential energy from a dropped object into kinetic energy, which is then absorbed by the beam as strain energy. This process is crucial for understanding how materials behave under dynamic loads, which is important in fields such as construction and aerospace.
When an object is dropped onto the free end of a cantilever, its potential energy due to gravity is...
Toughness and Hardness of Aggregate01:22

Toughness and Hardness of Aggregate

Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in the...

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Related Experiment Video

Updated: May 14, 2026

Data Acquisition Protocol for Determining Embedded Sensitivity Functions
07:46

Data Acquisition Protocol for Determining Embedded Sensitivity Functions

Published on: April 20, 2016

A Variable-Impulse Hammer Impact Test (VIHIT) Method for Improved Mode Shape Identification.

Alec Jensen1, Charles Riley1

  • 1Civil Engineering Department, Oregon Institute of Technology, Klamath Falls, OR 97601, USA.

Sensors (Basel, Switzerland)
|May 13, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces variable impulse hammer impact testing (VIHIT), a novel experimental modal analysis (EMA) method. VIHIT enhances impact hammer testing accuracy for structural health monitoring (SHM) by analyzing trends across varying impulse levels.

Keywords:
civil structural health monitoringimpact hammerimpulse hammermodal analysismodal parameter identificationnonlinear structuresvibration

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Published on: September 6, 2016

Area of Science:

  • Mechanical Engineering
  • Civil Engineering
  • Vibration Analysis

Background:

  • Impact hammer testing is crucial for structural health monitoring (SHM).
  • Traditional methods face limitations due to uncontrolled factors like swing power and operator consistency, especially in nonlinear structures.
  • Existing research often avoids hammer testing, opting for drop mass systems or operational modal analysis (OMA).

Purpose of the Study:

  • To develop a more accurate experimental modal analysis (EMA) approach for impact hammer testing.
  • To address the reliability issues of conventional impact hammer testing in structural dynamics.
  • To characterize nonlinear dynamic behavior and improve mode shape extraction.

Main Methods:

  • Introduced Variable Impulse Hammer Impact Testing (VIHIT) using a single-input single-output (SISO) roving hammer and fixed accelerometer.
  • Evaluated the imaginary component of the frequency response function (FRF) at various test locations using multiple impulses of varying magnitude.
  • Utilized inverse FRF analysis to extract nonlinear damping ratios and establish reproducible trends across different impulse levels.

Main Results:

  • Demonstrated reduced mode shape variability compared to conventional averaging techniques.
  • Successfully characterized impulse-dependent damping ratios in degraded timber beams, ranging from 0.02 to 0.04.
  • Showcased the method's ability to accurately extract modal properties, mode shapes, and nonlinear dynamic behavior.

Conclusions:

  • VIHIT offers a more accurate and reliable approach to impact hammer testing for SHM.
  • The method effectively addresses variability in testing by establishing reproducible trends.
  • This technique provides enhanced characterization of nonlinear dynamic behavior in structures.