Biomimetic Research In Athletic Shoes’ Cushioning Midsole Based On Superior Cushioning Characteristics Of Ostrich Foot Toepad

Inspired by the excellent cushioning performance,the paper took ostrich foot toepad as biological prototype,based on three-dimensional laser scanning technology,nuclear magnetic resonance imaging technology and reverse engineering technology,and combined with the engineering bionics principle,through applying the ostrich foot toepad to the structural and materials biomimetic design of athletic shoes’ midsole,a brand new biomimetic midsole with excellent cushioning performance was developed.Impact condition numerical simulation on the midsole was conducted using the finite element analysis software,and combined with the real impact test using simplified impact test machine,cushioning performance of the biomimetic midsole was evaluated.Through extracting the ―foot-shoe‖ interface parameters using F-scan insole plantar pressure test system,cushioning performance of the midsole was evaluated and a midsole with excellent cushioning performance was developed.The paper will provide a brand new design concept and theoretical basis for the design of athletic shoes’ midsole with excellent cushioning performance.In virtue of field experiment,combined with high-speed camera system and plantar pressure test system,the ostrich foot kinematics data was captured.Research shows that the maximum velocity of ostrich foot in vertical direction in the landing process was approximately 1.339m/s,which will provide input and control parameters for the finite element analysis.The ostrich foot toepad was performed slice scanning using magnetic resonance imaging technology and the organizational structure was extracted using Mimics,and then the three-dimensional model was refined and assembled using Geomagic Studio,and completed the three-dimensional model reconstruction process of ostrich foot toepad.The distribution and dimension of the three digital cushions inside the ostrich foot toepad was measured and analyzed through gross anatomical observation and macro measurement technology.The ostrich foot toepad parameters were extracted through the relevant biomechanical experiment,which will provide parameters basis for finite element analysis.The finite element model was established and analyzed using Abaqus.The bearing characteristics was analyzed using static bearing numerical simulation,research shows that the ostrich foot toepad possesses excellent load-carrying properties.The dynamic stiffness was analyzed using modal analysis,research shows that the ostrich foot toepad possesses excellent dynamic stiffness,and the main vibration mode is rotation.The cushioning characteristics was analyzed using dynamic impact numerical simulation,the test parameters were peak deceleration and peak impact force,etc,research shows that the ostrich foot toepad has excellent cushioning performance,which can reduce the ground impact effectively,and plays an important role in the protection aspect of the foot skeletal musculature.Three-dimensional point cloud data of the athletic shoes’ midsole was obtained by using handheld three-dimensional laser scanner.According to the material and structure and their mutual assembly relationship,took the ostrich foot toepad as biological prototype,structure and material coupling biomimetic design of midsole was performed.The impact condition numerical simulation of midsole was performed using Abaqus,the midsole was processed and impact experiment was performed using impact test machine,which was developed by our laboratory.The experiment was used to verify the excellent cushioning performance of the biomimetic midsole.Namely,by means of the combination of experiment and numerical simulation,the cushioning performance of the biomimetic midsole was analyzed.Research shows that the biomimetic midsole can reduce the peak deceleration and peak impact force effectively,plays an important role in energy absorption and cushioning.The cushioning performance of the athletic shoes’ biomimetic midsole and ordinary midsole was analyzed using F-scan insole plantar pressure test system,the main test area were forefoot and heel region.Research shows that compared with the ordinary midsole,wearing the athletic shoes’ with biomimetic midsole can reduce the peak pressure,peak force,force-time integration,mean pressure and pressure-time integration effectively,the biomimetic midsole has an excellent cushioning performance.Accordingly,the biomimetic midsole is able to relieve the burden of the foot,enhance the comfort of foot,as well as reduce the chance of sport injury.The paper will provide a brand new research idea for the development of athletic shoes’ midsole with excellent cushioning performance.