Design And Analysis Of Airbag Buffer Type Fall Protection System

Globally,falls are an important public health problem.When the human body falls and touches the ground,the huge impact force will cause damage to the human body.Reducing the impact force when the human body falls and touches the ground is of great significance to reduce the injuries suffered by the elderly when they accidentally fall.Facing the above requirements,this paper develops an airbag cushioning fall protection system.The fall detection algorithm is used to judge the fall state of the human body.Department of protection,the main work is as follows:Design the hardware system and airbag triggering device.Taking the improved trapezoidal movement law as the movement law of the follower,complete the design of the cam-type airbag trigger device;improve the design of the passive spring trigger device,and complete the design of the spring-type airbag trigger device;complete the selection and integration design of the hardware system.Design and analyze the semi-enclosed protective airbag.A plurality of long rectangular airbags interconnected in horizontal arrays are used as the main part of the protective airbag;the deformation model of the protective airbag is established by combining the finite element method and the geometric method;The protective airbag of the airbag is designed;the airbag is made by using a high-frequency plastic sealing welding machine and a hot press machine.Establish a simulation model of human frontal and lateral falls.Taking the peak impact force when falling as the evaluation index,the simulation analysis of various situations with airbag protection and without airbag protection is carried out,and the protective airbag is optimized according to the results.A fall recognition algorithm based on decision tree is designed.Analyze the fall behavior of the human body,divide the fall stage,and analyze the posture characteristics at the time of the fall;classify the daily behavior and fall behavior of the human body,complete the collection and preprocessing of human behavior information;select appropriate division attributes to train the decision tree model,and complete the fall recognition algorithm the design of.Conduct experimental research on fall protection systems.The triggering of the airbag trigger device and the inflation of the airbag take a total of 467ms;the accuracy of the fall recognition algorithm is 0.919;the fall protection system can be deployed before the human body touches the ground,meeting the needs of fall protection.The gas cylinder trigger device designed in this paper has the characteristics of small size and fast response;the simulation method adopted can select the protective airbag with the best protective performance according to the size of the human body;the fall protection system made has the characteristics of easy wearing and fast inflation speed,which can meet the usage requirements.