Abstract
To efficiently evaluate the influences on human body comfortableness under different vibrative condition, the paper comprehensively applied the surface electromyography (SEMG) and near infrared spectroscopy (NIRS) technology and obtained the relationship between mean power frequency (MPF) and regional tissue oxygen saturation (rSO2) and acceleration, frequency, time and amplitude through experiments on the variations of human body SEMG and muscle oxygenation under vibrative condition; analyzed and compared rules of variations of partial electromyography of the biceps brachii muscle, erector spinae muscle, biceps femories and tissue blood oxygen saturation depending on the changes of vibration parameter. With the analysis of the subjective evaluation, the author proposed the evaluation methods of human body comfortableness under different vibrate condition by muscle oxygenation and SEMG parameter. The study, with a certain degree of universalized quality, not only provides a new referential ergonomic criterion for the man-machine interface design of important facilities like tank and aircrafts, but can also be applied in the design evaluation of transportation vehicles and the evaluation of comfortableness of work environment. Key words: Vibration, comfortableness, biology, surface electromyography (SEMG), near infrared spectroscopy (NIRS), evaluation.
Highlights
IntroductionThe key factors for the evaluation of the impact of vibration on human body includes frequency, amplitude, acceleration, time and the way of human body under vibrative condition
The security, reliability and humanized design of manmachine operation interface of the human-machineenvironment system is a very significant part of ergonomic evaluation, under special conditions, such as vibration which produces critical impact on the safety of the operator.The key factors for the evaluation of the impact of vibration on human body includes frequency, amplitude, acceleration, time and the way of human body under vibrative condition
The common method is non-invasive measure which is to get electromyography signal through bipolar electrode lead and transform it into the frequency feature parameters that can reflect the variations of conducting speed, reflect the fatigue level of muscle
Summary
The key factors for the evaluation of the impact of vibration on human body includes frequency, amplitude, acceleration, time and the way of human body under vibrative condition. Studies show that human body are liable to resonance, which will directly impact the muscular system, the respiratory system, the circulatory system, the vegetative nervous system, the sensory system and make people feel uncomfortable negatively impact the operation safety (Pan, 2004; Li et al, 2009). This does not mean that high-frequency vibration does not harm the human body. In the blood supply to fingers and toes as well as obstacles of nerve ending sense shown in the way of nerve ending convulsion and abnormity of brain blood flow graph (Giese, 1984); in the muscle tissue, there will be counterbalanced oxygen deficiency which is reflected
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