Experimental And Simulation Study On Biomechanical Response Of Human Body Under The Action Of Rescue Individual Protective Equipment

With the rapid development of the national economy and the increasing complexity of the international situation at home and abroad,the dangers of industrial fires,chemical and chemical accidents and explosions are increasing,and the rescue environment facing rescue operations is becoming more and more complex,which brings certain difficulties to rescue operations.In order to protect the lives of rescue workers,it is indispensable to provide rescue personnel with personal protective equipment for rescue operations.The main rescue equipment used in China is fire service,chemical protective clothing,fire-fighting clothing,and explosive suits.In the rescue process,in addition to the explosive suit,the rest of the clothing must wear oxygen cylinders.Due to defects in wear time and rescue suit design,rescuers may experience discomfort such as dehydration,disengagement,etc.during long-term wear,and rescuers may feel fatigue or even cause some damage to the body.Therefore,it is of great significance to explore the biomechanical response of the human body under the action of rescue personal protective equipment,to optimize the rescue protective equipment and improve the efficiency of rescue work.On the basis of the work of the predecessors,this paper designed a set of experiments for the fire fighting suits,chemical protective suits,fire-fighting suits and explosive suits that were often worn during the rescue process.Under the same experimental environment,Nine firefighters were tested in four different sets of equipment,including static and dynamic tests.Statically test the pressure of the shoulder,waist and back of the tested soldiers,dynamically test the subjective fatigue of the tested soldiers,and quantify the subjective fatigue value.The obtained static pressure data combined with the dynamic fatigue value are analyzed.The results show that the quality of the equipment is an important factor affecting the shoulder pressure and subjective fatigue.The greater the mass,the greater the pressure on the shoulder and the greater the discomfort.The experiment found that the oxygen bottle bears the fire service on the outside of the garment,and the shoulder is under less stress.Volunteers who met the average body size of the Chinese were selected for CT and MRI scans to obtain 3D point cloud data of the anatomical structure of the whole body muscles and bones.The obtained data were imported into Mimics software,and the geometric model of the human body was obtained by processing the point cloud data.The geometric model of the human tissue part around the shoulders of the trapezius,deltoid,scapula,levator scapula,pectoralis major,scalene,clavicle,rib,vertebrae,scapula,etc.,through the ICEM-CFD module and Hypermesh software meshed to establish a finite element model;according to therelevant literature,set the muscle attribute data of the muscle and bone of the human body model.On this basis,the human body wearing the fire-fighting suit was simulated.The simulated shoulder pressure data was compared with the experimental data,and the results were consistent.The validity and reliability of the model were verified.Finally,using the built model,the human body wearing four sets of different rescue protective equipment was simulated,and the biomechanical response of the human body was obtained.Among them,the internal stress of the human body under the action of the explosive suit is the largest,and the parts that are most prone to strain are the deltoid,clavicle and trapezius muscles.The internal stress of the human body under the action of fire service suit,chemical protective suit and fire escape suit is not much different.The most vulnerable parts are clavicle,trapezius,deltoid,scapula,and scapula.The human body after changing the width of the oxygen bottle strap when wearing the fire suit is simulated.It is concluded that the greater the width of the strap,the smaller the shoulder pressure.Therefore,it is proposed that the rescue protective equipment carrying the oxygen cylinder can reduce the width of the strap and reduce the optimal solution for wearing the shoulder pressure of the equipment.