Abstract. Muscle is a type of tissue able to contract and, thus, shorten, producing pulling force generate movement. The analysis its activity essential understand how the generated perform movement and that can be estimated from direct or indirect measurements. Hill-type muscle model one most used models describe mechanism production. It composed by different elements behaviour (contractile, series elastic parallel element) tendon. In this work we analyze differences between formulations...

Abstract Walking rehabilitation using exoskeletons is of high importance to maximize independence and improve the general well-being spinal cord injured subjects. We present design control a lightweight modular robotic exoskeleton assist walking in subjects who can hip flexion, but lack knee ankle muscles. The developed prototype consists two orthoses, which are powered by motor-harmonic drive actuation system that controls flexion–extension. This module assembled on standard passive...

The aim of the present work is to study applicability singular spectrum analysis (SSA) processing sound signal from cutting zone during a turning process, in order extract information correlated with state tool. SSA novel non-parametric technique time series that decomposes given into an additive set independent series. correspondence between obtained using and frequency basis this technique. Finally, some features extracted SSA-processed were presented feedforward back-propagation (FFBP)...

Abstract A novel, synergy-based design for lower-limb, gait assistance exosuits is proposed in this paper. The general philosophy followed by the mathematical model that leads to exosuit’s actuation system from a certain set of postural synergies, which may reduce number total required actuators and, thus, overall weight and price. Cable extensions are chosen as variable upon principal component analysis performed, given high resulting cumulative variance obtained with few components....

AbstractThe purpose of this study is to simulate the different walking adaptation strategies and their impact on muscle activities while changing anchor point position an exosuit in hip extension assistance motion. In particular, activation metabolic power consumption are assessed at varying levels assistive force actuation that alters points. OpenSim software was used perform simulations 10 elderly subjects comfortable gait speed positions thigh. Compared unassisted gait, placements below...

Older adults (aged 55 years and above) have greater difficulty carrying out activities of daily living than younger 25–55 years). Although age-related changes in human gait kinetics are well documented qualitative terms the scientific literature, these differences may be quantified analyzed using analysis motor control strategies through kinetic synergies. The gaits two groups people (older adults), each with ten members, were on a treadmill at constant controlled speed their recorded....

This paper presents an approach to improving surface roughness prediction that is based on analysing cutting tool vibrations by a novel signal processing technique known as singular spectrum analysis (SSA). Each eigenvalue of the SSA decomposition each vibration (radial, tangential, and feed vibration) its corresponding principal component are studied analysed select only those eigenvalues contain valuable information for development system (SRPS). Also, influence geometry flank wear...

There is a growing interest in predicting the gait motion of real subjects under virtual conditions, e.g. to anticipate result surgery or help design prosthetic/orthotic devices. To this end, parameters can be considered as an optimization problem. In context, determination joint efforts for given required step subsequent evaluation cost function and constraints, but force plates will not exist. Therefore, force-based approach proposed estimate during whole gait, including double support phase.

The objective of this work was to design and build a fully mechanical knee orthosis. A orthosis should both allow control the angle flexion during stance phase gait cycle leave joint free swing phase. Knee orthoses are normally used assist walking people suffering from muscle weaknesses or pathologies in order avoid excessive proposed present is characterized by allowing be locked at any phase, because can unlocked released without action external agent, i.e., requiring electrical electronic...

Hybrid orthoses or rehabilitation exoskeletons have proven to be a powerful tool for subjects with gait disabilities due their combined use of electromechanical actuation provide motion and support, functional electrical stimulation (FES) contract muscle tissue so as improve the process. In these devices, each degree freedom is governed by two actuators. The main issue arises in design profiles there natural normative which actuators are transparent other. exoskeleton control solutions...

Nowadays, both usability and comfort play a key role in the development of medical wearable products. When designing any device that is contact with human body, mechanical behavior embraced soft tissue must be known. The unavoidable displacement during motion may lead to discomfort and, thus, removal product. This paper presents new methodology design test based on measurement dynamic skin strain field. Furthermore, from this field, anatomical lines minimum (lines nonextension (LoNEs)) are...