Engineering Simulation Of Knee Orthosis In Ansys Complex And Approbation

P eople are susceptib le to various forms of injur y,includin g con genital and acquired dise ase s.The knee joint is one of the largest and strongest joints in the human bod y,its incidenc e rate cont inues to increas e with approx imatel y250 million people wo rldwide curr entl y affe cted b y kne e disorders,primaril y in the form of c artilage d ama ge.How e ver,d yn amic loads on the articular cartila ge in the knee joint can be relia bl y p redicted b y ex ternal torque and impulses.There fore,limb function can be further r estored b y designing ide al orthoses to repair,a ctivate and co rre ct damaged joints.But there a re man y knee orthoses curr en tl y on the mark et that do not meet the requirements for use,such as low therapeutic efficienc y,poor comfort,and inabilit y to adju st the hinge bendin g a ngle.Henc e,with th e theme o f improvin g the qualit y of life of the activit y-li mited group,this thesis will re gard kne e orthosis as main resea rch object and e stablish its finite ele ment mathematical model to anal yz e the critical lo ad de f ormation of the plas tic orthosis.Furthe r,the influen ce o f the manufa cturin g a nd molding process paramete rs of the plastic orthosis on its strength and stiffness are studied ba sed on 3D printing technolog y,and finall y propos e a co mputer-guided oper a t ion al gorithm.The detailed rese arch contents are as follows.(1)A finite element mathematical model of the lower limb is established.The limb positions of the kn ee and ankle ar e sc anned at 90 ° of fl exion and ex tension,respectiv el y,and virtual protot yp e models are c r eated to acquire data.The acquir ed data a re imported into the softwar e fo r mathematical modeling to provide support for anal yz in g the critical loads o f orthotic plastic transformation using diffe rent material c ases during ax ial de formation of the limb.(2)Anal yz e the crit ical load of the limb ax ial deformation leading to plastic transformatio n.C onsidering th e d eformation of the li mb axis,the mesh is divided and the load is applied in ANS YS based on the finite element anal ysis method,an d the anal ysis of the concentr ated load action and stress calculation are car ried out to provide a refer ence for evalu ating the qualit y o f the orthosis.P reliminar y calculations show that the most problematic area of the knee orthosis is at its smallest deta i l.(3)To stud y th e influence of manu f acturing and molding pro cess paramete rs on the st ren gth and stiffn ess of plastic orthoses.C onsiderin g the individual chara cter istics of each patie nt’s leg structur e a nd the diffe rent properties of the c haracte ristics,the influence of th e ma nufacturin g and molding proc ess par ameters on the strength and stiffness of the orthosis are investigated b y ch an gin g the material and printing param eters with the help of3 D printing techn olog y of composite parts from both design and manufacturin g aspe cts,and it i s found that temper ature fluctua tions during th e printing process can lead to delamination.(4)A compute riz ed navigation oper ation algorithm is proposed.To cover the shortcomings of conventional navigat ion operations th at cannot meet the needs and ac cura c y of personaliz ed knee orthoses,an algorit hm for appl yin g computeriz ed navigation operations te chnolog y bas ed on a mathematical model of le g morpho logical char acteristic s is proposed to mak e it possible to improve patie nt outcomes,taking into ac count the var yin g m orpholog y of the human leg.