Related Experiment Video
Updated: Apr 19, 2026
10:52
Simulation of Human-induced Vibrations Based on the Characterized In-field Pedestrian Behavior
Published on: April 13, 2016
9.3K
Damping and energy dissipation in soft tissue vibrations during running
Arash Khassetarash1, Reza Hassannejad1, Hendrik Enders2
1Department of Mechanical Engineering, University of Tabriz 51666-14766, Tabriz, Iran.
Journal of Biomechanics
|December 22, 2014
Summary
Soft tissue vibrations are complex, involving multiple modes. This study used partly ensemble empirical mode decomposition (PEEMD) to analyze gastrocnemius muscle vibrations during sprinting, revealing distinct damping properties for different vibration modes.
Area of Science:
- Biomechanics
- Biomedical Engineering
- Muscle Physiology
Background:
- Soft tissue vibrations are complex and cannot be represented by a single sinusoidal function.
- These vibrations comprise multiple distinct modes, each potentially having unique characteristics.
- Understanding these modes is crucial for analyzing muscle dynamics during movement.
Purpose of the Study:
- To extract and analyze individual vibration modes in soft tissues.
- To quantify damping properties and energy dissipation for each identified vibration mode.
- To investigate the implications of these findings for understanding muscle tuning during locomotion.
Main Methods:
- Partly Ensemble Empirical Mode Decomposition (PEEMD) was employed to extract vibration modes from acceleration signals.
- A novel methodology was developed and validated for estimating damping properties and energy dissipation per mode.
- The methods were applied to acceleration data from the gastrocnemius muscle during sprinting.
Main Results:
- High-frequency vibration modes exhibited higher damping properties than low-frequency modes.
- All identified vibration modes were underdamped, indicating an oscillatory nature.
- Lower frequency modes showed significantly increased damping ratios and greater energy dissipation compared to higher frequency modes.
- Findings align with the muscle tuning paradigm, supported by ground reaction force (GRF) power spectrum analysis.
Conclusions:
- Damping properties and energy dissipation vary significantly across different vibration modes in soft tissues.
- The analysis provides insights into muscle tuning mechanisms during activities like sprinting.
- Suggested that these parameters could serve as indicators for different running conditions, such as surface variations or fatigue levels.
Related Concept Videos
01:20Types of Damping
8.2K
If the amount of damping in a system is gradually increased, the period and frequency start to become affected because damping opposes, and hence slows, the back and forth motion (the net force is smaller in both directions). If there is a very large amount of damping, the system does not even oscillate; instead, it slowly moves toward equilibrium. In brief, an overdamped system moves slowly towards equilibrium, whereas an underdamped system moves quickly to equilibrium but will oscillate about...
8.2K
01:07Damped Oscillations
7.7K
In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
Although friction and other non-conservative...
7.7K
01:19Concept of Resonance and its Characteristics
7.0K
If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...
7.0K
01:17Magnetic Damping
1.3K
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...
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...
1.3K
01:23Energy in Simple Harmonic Motion
13.7K
To determine the energy of a simple harmonic oscillator, consider all the forms of energy it can have during its simple harmonic motion. According to Hooke's Law, the energy stored during the compression/stretching of a string in a simple harmonic oscillator is potential energy. As the simple harmonic oscillator has no dissipative forces, it also possesses kinetic energy. In the presence of conservative forces, both energies can interconvert during oscillation, but the total energy remains...
13.7K
01:19Impact Loading
914
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,...
In cases of elastic deformation,...
914