Development Of Knee Protection System For The Elderly

The knee protector for the elderly falling was aimed to study in this thesis. A series of steps were carried out to finish the thesis. Firstly, the 3D scanning technology was used to measure and print the real-shaped knee of different older people. Secondly, the plastic foam ABS was use to print the real shaped-knee bone, which can outstand the real shape of patella, meniscus and lateral and medial collateral ligaments. Thirdly, these making systems of Stoll-Ml and Longxinknit CAD were designed to draw the shape and structures of the outer knee protector, when finished, two kinds of raw material were used to fabricated the outer knee protector, they are core spun yarn consisting of acrylic and Kevlar and bamboo charcoal fiber, respectively. Then the computerized flat knitting machine Stoll-CMS 320TC and LXC-252SCV were used to fabricate the knee protector. Fourthly, the buffer specimens filling into the outer knee protector were to tested including the static compression performance and dynamic buffer characteristic. All of these specimens can be filled in to as the outer filing materials. When the whole knee protector was finished, we used it to study the protective property in the end procedure. Finally, the thin-film resistor sensor was used to detect the value of voltage when the testers wearing the knee protector or not fall at the walking speed of 0.8m/s and their patellas impact on the ground vertically. In the process, the program control system Arduino was used to collect and receive the value of voltage when the testers fall. At the end of this thesis, the data analysis system origin was used to fit the curve formula about the histories of voltage and force value, by which the protective performance of the knee protector acting o the real falling behavior can be analyzed. According to these steps, these conclusions could be acquired:(1) The method of 3D scanning can solve the bone deformation of different older people because of diseases leading to.(2) In the experiment, we can find a certain hardness of elastic plastic foam has the best performance of static and dynamic performance. In addition to, for the spaced fabric, the static buffer effect and the dynamic buffer impacting coefficient were decided by two factors, firstly, the fineness of surface and spaced yarn, when the density of loops is the same, if the value of the fineness of surface and spaced yarn are larger, the grams per square meter are larger, so the static buffer effect and the dynamic buffer coefficient are larger. Secondly, if the lapping angle and the fineness of surface and spaced yarn are the same, the density of loops is different, so the density of spaced yarn is also not the same, so the static buffer effect and the dynamic buffer coefficient are excellent. So it can be found that the S2*6 also can be used as the filling materials for the knee protector.(3) The thin-film resistor sensor was used to detect the value of voltage when the testers wearing the knee protector or not fall at the walking speed of 0.8m/s and their patellas impacting on the ground vertically. In the process, the program control systemArduino was used to collect and receive the value of voltage when the testers falls, at the same time, the universal tester was used to find the value of force when it was pressed to the value of the voltage from the program control system Arduino. At the end of this thesis, the data analysis system origin was used to fit the curve formula about the histories of voltage and force value, by which the protective performance of the knee protector acting o the real falling behavior can be analyzed. We can find when the weight of testers was larger, the effect of protective knee protector was larger, the fine protective efficiency comes to 99.39%, which can meet the energy requirement during the elderly falling.