Vibration Measurement and Analysis Using Image Processing Method

Volume 2 ◽  
2004 ◽  
Author(s):  
Roya Narimani ◽  
Maryam Hoviattalab ◽  
Arash Abadpour ◽  
Azadeh Yadolahi
Keyword(s):  
Image Processing ◽  
Human Body ◽  
Mechanical Impedance ◽  
Displacement Function ◽  
The Body ◽  
Shaking Table ◽  
Vibration Measurement ◽  
Whole Body ◽  
Sinusoidal Vibration ◽  
Body Vibration

A large number of people are exposed to whole body vibration in their occupational life. Measuring vibration is an important tool in rehabilitation and biomechanical fields of research. We have proposed image processing as a new method to record and determine the frequency response of human body. The arranged set up for forced vibration consisted of an AC motor, a variable speed drive unit and a shaking table for producing one directional sinusoidal vibration. Volunteers were asked to stand on the shaking table at a relaxed posture. Two digital camcorders were used to capture the motion of colored pencil-dot markers on the skin of human body (forehead) and on the edge of the shaking table. After color spotting each frame, the binary image results were processed using new circle factor criteria proposed in this work, for fast finding circles based on second order statistics. The extracted points were calibrated using our own extended version of the direct linear transformation (DLT) method. Subsequently Vibration measuring software has been completely developed in Borland Delphi 5.0. Finally obtained displacement function of the body and the shaking table has been used in conjunction with Matlab 6.5 to prepare a proper algorithm for analyzing human body vibration. We discussed mechanical characteristics of the body by obtaining mechanical impedance and transmissibility from the shaking table to the head as example applications of the conducted software. The important point is the fact that all devices used in our developed measurement system are usually available in a biomechanics laboratory where a Gait system is functioning. This gives the opportunity for such laboratory to add vibration measurement to its capabilities without much excessive costs. The system has the advantage of lower noise sensitivity in comparison to accelerometer. The main advantage of this method is working with a simple user-familiar hardware with no external device attached to the subject and also a user-friendly-software.

New Image-Based System for Vibration Measurement, Specially Developed for Forced Human Vibration Analysis

2004 ◽  
Author(s):  
Maryam Hoviattalab ◽  
Roya Narimani ◽  
Azadeh Yadollahi ◽  
Arash Abadpour
Keyword(s):  
Human Body ◽  
Mechanical Impedance ◽  
Modern Technology ◽  
The Body ◽  
Shaking Table ◽  
Vibration Measurement ◽  
Whole Body ◽  
Second Order Statistics ◽  
The Subject ◽  
User Friendly

The human being in the environments of modern technology has to endure stresses of many and varied kinds of vibrations [1]. Measuring vibration is an important tool in rehabilitation and biomechanical fields of research. We have proposed image processing as a new method to record and determine the frequency response of human body. The subjects were exposed to whole body periodical vibration while standing on a shaking table. Two digital camcorders were used to capture the motion of colored pencil-dot markers on the skin of human body (forehead) and on the edge of the shaking table. After color spotting each frame, the binary image results were processed using new circle factor criteria proposed in this work, for fast finding circles based on second order statistics. The extracted points were calibrated using our own extended version of the direct linear transformation (DLT) method. We subsequently used Borland Delphi 5.0 language to develop useful software for measuring and analyzing human body vibration. As a result, it was clear that the proposed method was lower noise-sensitive in comparison to accelerometer. In order to investigate the validity of the software, the obtained mechanical impedance of the body were compared with other investigations in literature and showed to be compatible. The main advantage of this method is working with a simple user-familiar hardware with no external device attached to the subject and also a user-friendly-software.

Modeling of Human Reactions to Whole-Body Vibration

1987 ◽  
Vol 109 (3) ◽  
pp. 210-217 ◽  
Author(s):  
Farid M. L. Amirouche
Keyword(s):  
Human Body ◽  
Equations Of Motion ◽  
Vertical Direction ◽  
The Body ◽  
Whole Body ◽  
Connective Tissues ◽  
Finite Segment ◽  
Body Vibration ◽  
Forcing Function ◽  
Impulse Function

A computer-automated approach for studying the human body vibration is presented. This includes vertical, horizontal, and torsional vibration. The procedure used is based on Finite Segment Modeling (FSM) of the human body, thus treating it as a mechanical structure. Kane’s equations as developed by Huston et al. are used to formulate the governing equations of motion. The connective tissues are modeled by springs and dampers. In addition, the paper presents the transient response of different parts of the body due to a sinusoidal forcing function as well as an impulse function applied to the lower torso in the vertical direction.

scholarly journals Modeling of Spinal Column of Seated Human Body under Exposure to Whole-Body Vibration

2008 ◽  
Vol 2 (6) ◽  
pp. 1327-1338
Author(s):  
Gen TAMAOKI ◽  
Takuya YOSHIMURA ◽  
Kaoru KURIYAMA ◽  
Kazuma NAKAI
Keyword(s):  
Human Body ◽  
Whole Body Vibration ◽  
Spinal Column ◽  
Whole Body ◽  
Body Vibration

scholarly journals The Effects of Whole Body Vibration in Physiotherapy – a Review of the Literature

2019 ◽  
Vol 61 (3) ◽  
pp. 208-212
Author(s):  
Mateusz Bartczyk ◽  
Andrzej Suchanowski ◽  
Marta Woldańska-Okońska
Keyword(s):  
Sports Injuries ◽  
Cardiovascular Response ◽  
Whole Body Vibration ◽  
The Body ◽  
Whole Body ◽  
Incomplete Spinal Cord Injury ◽  
Body Vibration ◽  
Stimulation Parameters ◽  
Cord Injury ◽  
Therapeutic Measures

Over the last decade, the use of vibration-supported therapeutic measures has been increased. There are many devices in the market that generate whole body vibration, but they can be divided into three groups due to the frequency, amplitude and direction of the vibrations being applied to the body. The aim of the work is to analyze the results of the most important works discussing the use and effectiveness of the therapeutic effect of vibrations on the human body. The studies are indicative of favourable changes to the symptoms of neurodegenerative diseases, neurological dysfunctions, incomplete spinal cord injury, sarcopenia and senile age disorders, osteoporosis, sports injuries. The use of whole body vibration does not result in significant changes to the hemodynamic function during therapy, although appropriate stimulation parameters may induce sufficient cardiovascular response to improve overall physical fitness. In the physiotherapy procedure, the whole body vibration is another means of increasing the effect of the therapy used.

scholarly journals BIOLOGICAL AGE AS A METHOD FOR ESTIMATING HEALTH LEVEL UNDER ENVIRONMENTAL RISKS (LITERATURE REVIEW)

2019 ◽  
Vol 98 (7) ◽  
pp. 761-765 ◽  
Author(s):  
N. I. Prokhorov ◽  
V. I. Dontsov ◽  
Vyacheslav N. Krutko ◽  
T. M. Khodykina
Keyword(s):  
Human Body ◽  
Quantitative Assessment ◽  
Modern Human ◽  
The Body ◽  
Biological Age ◽  
Whole Body ◽  
New Methods ◽  
Biomarkers Of Aging ◽  
Age Related ◽  
Definition Of

The widespread formation of unfavorable environmental, the swiftness of modern life with large information and psycho-emotional loads and extremely natural and climatic cataclysms, as well as harmful addictions and wrong way of life of modern human, lead to the development of stress and disruption of the mechanisms of adaptation of the human body and its accelerated wear. This stimulates the development of research on the creation of new methods of integrated assessment of health and quantitative assessment of the aging processes of the body systems and the whole body, as well as the possibilities of new methods of risk assessment of climatic and environmentally related pathological and age-related diseases. The aim of the work was to consider the methodology of quantitative assessment of individual health and the rate of aging of the human body on the basis of the system index of Biological age (BA); description of its essence and structure, requirements for tests - biomarkers of aging used as the index of BA, definition of possibilities and scope of application of the BA method in modern practice of Biomedicine. The use of modern methods of scientific analysis - a systematic approach to the analysis of the processes of human aging and determine its quantitative side - the value of BA, allows a reasonable approach to the choice of the number of BM, to take into account their information content and precision, and the cost of diagnostics and availability for different users, to take into account the specific objectives of the researcher. The use of the index-partial BA allows individual approaching the choice of biomarkers and create personalized panels for the definition of BA programs for the prevention of aging in personalized preventive medicine. The complexity of the content and calculation of indices of BA requires automation and the use of methods of modern computer science and computer calculations and programs. For this purpose, we have created special computer software for diagnosing aging by calculating the BA indices with the possibility of choosing BM and automatic calculation of indicators and conclusions.

scholarly journals Safe Duration Of A Person Soaking Inside A Hot Tub: Theoretical Prediction of Temperature Elevations in Human Bodies Using A Whole Body Heat Transfer Model

2020 ◽  
Author(s):  
Myo Min Zaw ◽  
Manpreet Singh ◽  
Ronghui Ma ◽  
Liang Zhu
Keyword(s):  
Heat Transfer ◽  
Human Body ◽  
Energy Balance Equation ◽  
The Body ◽  
Whole Body ◽  
Equation Modeling ◽  
Transient Temperature ◽  
Transfer Model ◽  
Bioheat Equation ◽  
Arterial Blood

In this study, we first develop a whole body model based on measurements of a human body, with realistic boundary conditions incorporated before and after a person jumps into a hot tub. For the transient heat transfer simulation, the initial condition is the established steady state temperature field of the human body with appropriate clothing layer to ensure the thermal equilibrium of the body with its surroundings. Once the person is inside a hot tub, the Pennes bioheat equation is used to simulate the transient temperature elevations of the body, and the rising of the arterial blood temperature is solved by an energy balance equation modeling thermal exchange between body tissue and the blood in the body. The safe duration of soaking in hot tubs is then determined as affected by the hot tub water temperatures.

Biodynamic Characteristics of Upper Limb Reaching Movements of the Seated Human Under Whole-Body Vibration

2013 ◽  
Vol 29 (1) ◽  
pp. 12-22 ◽  
Author(s):  
Heon-Jeong Kim ◽  
Bernard J. Martin
Keyword(s):  
Right Hemisphere ◽  
Whole Body Vibration ◽  
The Body ◽  
Upper Body ◽  
Whole Body ◽  
Vibration Transmission ◽  
Body Vibration ◽  
Body Segments ◽  
Human Movements ◽  
Reach Movements

Simulation of human movements is an essential component for proactive ergonomic analysis and biomechanical model development (Chaffin, 2001). Most studies on reach kinematics have described human movements in a static environment, however the models derived from these studies cannot be applied to the analysis of human reach movements in vibratory environments such as in-vehicle operations. This study analyzes three-dimensional joint kinematics of the upper extremity in reach movements performed in static and specific vibratory conditions and investigates vibration transmission to shoulder, elbow, and hand along the body path during pointing tasks. Thirteen seated subjects performed reach movements to five target directions distributed in their right hemisphere. The results show similarities in the characteristics of movement patterns and reach trajectories of upper body segments for static and dynamic environments. In addition, vibration transmission through upper body segments is affected by vibration frequency, direction, and location of the target to be reached. Similarities in the pattern of movement trajectories revealed by filtering vibration-induced oscillations indicate that coordination strategy may not be drastically different in static and vibratory environments. This finding may facilitate the development of active biodynamic models to predict human performance and behavior under whole body vibration exposure.

A Methodological Investigation of Subject Input/Output Related Error during Vibration

1982 ◽  
Vol 26 (6) ◽  
pp. 533-537 ◽  
Author(s):  
Jeffery C. Woldstad ◽  
Alvah C. Bittner ◽  
John C. Guignard
Keyword(s):  
Performance Test ◽  
Test System ◽  
The Body ◽  
Whole Body ◽  
Sinusoidal Vibration ◽  
Frequency Interaction ◽  
Auditory Response ◽  
Future Experimentation ◽  
Output System ◽  
Response Task

An auditory-input/keypad-output system was evaluated for use as a performance test system that would be independent of artifactual vibrational decrement. Six young Navy volunteers were administered a non-cognitive Auditory Response Task Before, During, and After whole-body sinusoidal vibration. Two were tested at each of three vibration conditions (8 Hz/0.21 gzrms, 16 Hz/0.43 gzrms, and 32 Hz/0.85 gzrms). Results showed no direct decrement due to vibration, but a moderately significant subjects-within-conditions by frequency interaction. This interaction, paired with subjective measures taken during experimentation, pointed to a deficit in the keypad output system. It was concluded that the system was not satisfactory for future experimentation and recommended that a modified input system be developed. It is noted that purely cognitive effects of vibration have not been identified in the body of previous research.

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