Exoskeletons: Reducing joint and muscle loads while performing difficult tasks
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1 Exoskeletons: Reducing joint and muscle loads while performing difficult tasks The web cast will start in a few minutes. Amir Al-Munajjed, Moonki Jung AnyBody Technology
2 Outline: Who & what is AnyBody? What means Exoskeletons? Amir Al-Munajjed (Presenter) Overview: Exoskeletons with AnyBody Shoulder, spine, knee Example reducing knee & hip loads How to import? How to connect? What results available? Questions & answers Moonki Jung (Panelist) Arne Kiis (Host)
3 Who is AnyBody? AnyBody Technology (Aalborg, DK; Boston, US) AnyBody Modeling System Licenses, Training, Support Consulting AnyBody Research Group DK: Aalborg University - Prof. Rasmussen Biomechanics, Ergonomics, Sport, Automotive US: Colorado School of Mines Prof. Patrella Biomechanics, Orthopedics, Sport GER: OTH Regensburg Prof. Dendorfer Biomechanics, Orthopedics, Gait
4 What is AnyBody? A nybody M odeling S ystem A nybody M anaged M odel R epository - Software/tool - Body Model - Library of applications
5 Musculoskeletal Simulation Input Activity/ Motion Output Muscles: forces, activity, power Joints: forces, moments,... Body Model Bones Joints Muscles Ligaments
6 Inverse Dynamic Analysis Input: Output: - Muscle Forces (activations) - Joint Reaction Forces Motion & ext Forces: - Motion Capture (Vicon, Qualisys,...) - Joint Angle Input
7 Product Design Optimization Gait Application AnyGait Ergonomic Analysis and Documentation Modeling System Physiological Load Cases for Finite Element Analysis Surgical Planning, - Evaluation & -Failure Analysis
8 Advanced Work flow SW CAD environment model (SolidWorks2AnyBody) Subject information Applications: Activities of daily living Processing workflows: Scripting e.g. Python, Matlab. Optimization software FE-model
9 What means Exoskeleton? An exoskeleton is a wearable robot attached to the human body to influence or assist human motion. Motion assistance for patients in rehab. Muscular enhancement of industrial workers or soldiers. Active engine to provide torque/force for joints. Passive stiffness to support/limit body motion.
10 Exoskeleton in rehab Patients with no or low functionality in extremities: Stroke patients Paraplegic patient Learn to walk again. ReWalk exoskeleton Argo Medical Technologies
11 Exoskeleton in work environment Lift heavy loads, perform difficult tasks while: Keep low joint reaction forces. Limit muscle activations/ limit muscle fatigue. Honda HAL 5: CYBERDYNE
12 Exoskeleton in military Support soldiers: Better endurance Carry heavy equipment Cover long distances future soldier US Army
13 Exoskeletons and AnyBody AnyBody simulations help to: Find optimal parameters of exoskeleton Torque Power Kinematics Stiffness... Analyze effect of exoskeleton on human Joint loads Muscle activations (injured/non-active) Bai & Rasmussen 2011
14 Assistive shoulder orthoses for brachial plexus injury Zhou et al. 2012, AAL Forum 2012
15 Assistive shoulder orthoses for brachial plexus injury Zhou et al. 2013
16 Effect of Actuator Moment on ind. muscles 1. Standard Control 2. Exoskeleton with: constant assistive moment variable assistive moment assistive moment Agarwal et al. 2010
17 Stooped posture with a personal weight transfer device Ulrey & Fathallah 2012, J Electro. Kinesiol
18 Stooped posture with a personal weight transfer device Ulrey & Fathallah 2012, J Electro. Kinesiol
19 Lifting different weights with a wearable robot using different constraints How to attach a exoskeleton to the human? Cho et al. 2012
20 Human-Exoskeleton example I have designed an exoskeleton, how will it affect a human subject? Moonki Jung
21 SolidWorks to AnyBody Translation of your CAD model into AnyBody
22 SolidWorks to AnyBody Geometry Weight Inertia Joints Reference nodes
23 Human-Exoskeleton model What actuator in exoskeleton? 6 actuators (hip, knee and ankle) 2 different actuators types (strong and medium) How to attach exoskeleton to human? Pelvis, both of thighs, both of shanks Moonki Jung
24 Human-Exoskeleton model Definition of motion Parameterized joint angle definition available External forces Prediction of ground reaction forces
25 torque [Nm] Results in Human 0-5 Hip Flexion Moment Human Human_med_Exo Human_str_Exo -50 time [sec]
26 force [N] Results in Human 2500 Hip Joint Force Human Human_med_Exo Human_str_Exo time [sec]
27 torque [Nm] Results in Human Knee Flexion Moment time [sec] Human Human_med_Exo Human_str_Exo
28 force [N] Results in Human 2500 Knee Joint Force 2000 Human Human_med_Exo Human_str_Exo time 1[sec] 1.5 2
29 torque [Nm] torque [Nm] Results in Exoskeleton Hip Actuator Moment Knee Actuator Moment time [sec] med_exo str_exo time [sec] med_exo str_exo
30 Power [W] Power [W] Results in Exoskeleton Hip Actuator Power Knee Actuator Power med_exo str_exo med_exo str_exo time [sec] time [sec]
31 Conclusion AnyBody simulation can help during development of exoskeleton (Optimize key parameters) evaluation of exoskeleton (effect on human body) How to fix the exoskeleton to human body? Rigid Elastic springs (force dependent kinematics) A lot more possibilities: Healthy subjects or Patients Single muscle activations Metabolic / Mechanical Power...
32 You can write your questions in the Q&A panel. Amir: Moonki: Meet us at: March: ORS/AAOS: New Orleans, USA 2 April: AnyBody Intro Event, Regensburg, Germany 8 April: Webcast lumbar spine Events, dates, publication list,... Wiki, Forum Videos, help, demos, tips & tricks
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