A great opportunity to present some key work at Motion Robotics took place recently when Man Bok Hong and Yoon Yeo Hun visited MR from South Korea.
Hong and Yeo Hun are engineers in the 5th (Ground Weapon Systems) R&D Institute of ADD. The visit allowed us to share our view points on exoskeletons for use in the field and the implications on design and the rational of the exo functionality.
MR presented some of its latest exo skeleton actuator designs and latest Crash Robot systems used to determine the envelope of future exo injury protection systems.
Motion Robotics took part in the July 2015 event which is a rehearsal for the main Cybathlon 2016.
For more on what we have been up to please visit www.flexoskeleton.co.uk
Motion Robotics are happy to introduce a new line of research actuator.
The Flexmotor is both a DC multi-pole motr and a limb at the same time.
Have a look at the Flexmotors Page!
Following recent tests at different speeds using different intention activation methods we have concluded that a simple but effective solution is the use of ground force sensing and leg angle.
For a montage of the testing video clips please click on here:- montage
The Hubot footwear has been modified to include a mix of sensors including soleus muscle EMG, leg angle and heel and toe ground force sensors.
Using a treadmill at 15 degree incline we are aiming to achieve a 20% metabolic cost saving while walking with a heavy load.
Using the Swiss Military backpack load of 36Kg as standard we aim to be able to carry this and walk comfortably at 5KPH for 30 minutes without fatigue.
Without any assistance COULD YOU ?
Have a look :– treadmill
Ground force and leg angle used for intention detection
Hubot is a footwear that is designed to comfortably augment your ability to walk carrying a heavy load for extended periods.
Our current results indicate that one can significantly impact the length of time one can walk with a heavy load, in particular assisting the body sufficiently so that anaerobic fatigue does not set in.
The foot wear is driven by air from a back pack compressor weighing 6Kg together with the 24Ah 12V battery.
The actuators on the footwear are driven by a combination of accelerometer signals and EMG from the user’s calf muscle.
The exoskeleton fits to any sports shoe and weighs less than 500 grams.
In order to test the impact on endurance walking with a heavy load, trials have been carried out on treadmills and in open fields with the test subject carrying around 30Kgs load plus the 7.5Kgs for the footwear and backpack. The treadmill is set to a 10 degree incline.
The results are very promising. The graph below shows the savings in energy computed by measuring the decrease in heart rate for the trials subject doing the same walking task.
Whereas the test subject must stop due to muscle fatigue and pain at the 4.5 minute mark, with the footwear the user can continue for as long as the battery holds out.
For a video please click on this link: walking Treadmillwalkwithweights clip
Our paper on “”Power and Endurance for Comfortable Wearable Robotics.” will be presented at ICRA 2014 in Hong Kong in late May 2014.
This paper highlights our recent results in assistive robotics for walking where we have demonstrated that an adapted sports shoe may be powered so as to reduce the metabolic cost of walking when carrying a heavy load.
Click below to download the PDF of our paper
Paper to be presented at ICRA 2014 downloadable PDF
Following further research work, Motion Robotics can demonstrate significant improvements in endurance are possible wearing Hubo type footwear.
In a graded set of tests, using heart rate as the primary energy expenditure metric, the results indicate that the easy to fit footwear can reduce the impact of carried payloads by half.
In the graphs below you can see that the impact of a 16Kg payload on energy expenditure was halved using the footwear.
With improvements Motion Robotics believes that the footwear could make carrying a 20Kg payload feel like carrying a briefcase.
To see a Video click here: – Hubot Endurance
As part of the Hubo wearable robotics development we are increasing the force and actuation distance of our patented air muscle design. The video here shows the immense forces and speed at which they operate. The 16Kg kettle weight is thrown around like a plastic toy. Have alook! at this front view 16Kg lift video.
Motion Robotics has proven early success of its Wearable Robotic Technology for augmenting human motion. By using a new approach to exoskeleton design and actuation, the human limb can receive significant extra motion assistance without the need for uncomfortable straps and heavy apparatus.Instead the user can wear the devices and not even realise that they are in fact there. This is achieved by using a totally new approach to mounting the actuation anchor points.
In addition the technology integrates fully with the wearer’s motion by blending the humans force generation with the actuator much like when couples ballroom dance. In this way the wearer learns to act in a synergistic manner without the need for complex sensors on the body and the chance of failures due to inadequate blending of man and machine.