Measurement and Analysis of Human Lower Limbs Movement Parameters during Walking

Abstract

It is necessary to analyze human gait for treatment and rehabilitation of human with musculoskeletal disorders of the locomotion apparatus (LA). The main goal of this work is evaluation of locomotion apparatus motion parameters captured by inertial measurement units (IMU) during walking. Motion Capture technology is process of getting practical results and data from IMU installed in different parts of human lower limbs. Synchronously, IMU send information about human movements to PC at the same moment of time. Such method gives an opportunity to follow parameters in some points of human leg in real time. The way of devices mounting and instruction for human under monitoring are based on related medical projects. Walking is selected for estimation of the musculoskeletal system as typical action. Experiment results got from several experiments were considered and analyzed.Basically, walking is described as a set of the system “human” discrete states. In the same time, the IMU sensors transmit motion parameters data continuously. It is proposed to present the man as a system with a control signal in the form of the double support period. The length will be measured using data from IMU. Double support period is chosen because its presence distinguishes walking from running.The most attention is given to getting the same practical results and data that can be obtained by placing the devices in different parts of the body. Moreover, a technique of using inertial measurement devices for measuring human motion to get some numerical results is shown. The use of this technique in practice demonstrated that it can be used to obtain an objective parameter describing the motion of the person. Continuation of this work is directed to create a complete model of the lower limbs motion for usage in practice [1].

Modelling of the Human Knee Joint Supported by Active Orthosis

“…The next group of mathematical models consists of multilink constructions simulating human lower-limb motion [5]- [7]. The third group of lower-limb mathematical models is composed of models created on the basis of captured data from sensors during real experiments of human walking [8]- [18].…”

Mathematical simulation of human lower limbs movements

“…1) состоит из условных левой ноги (элементы 2, 3,4,5,7,15), правой ноги (элементы 14,16,17,18,19,21), таза (элементы 6,8,12,13), поддерживающей таз части (элементы 9, 10, 11), ограничителей движения и направляющих пластины-таза (элемен-ты 23, 24,25,26,27,28,29,30) и акселерометров (31), регистрирующих нагрузку (22). Принцип работы экспериментального прототипа следующий: после запуска шаговых двига-телей 1 и 20 левая рейка 2 начинает двигаться вверх.…”

“…Усредненные профили вертикальных перемещений пятки, полу-ченные с помощью оптической системы и акселерометров, показаны на рис. 3 [27][28][29]. Калибровка измерительной системы связана с обработкой первоначально полученных зашумленных экспериментальных данных.…”