Exoskeleton Research
While current research may not provide humans with super strength, it can augment and reinforce the abilities of the human body. Ironically, some of the most interesting research in the area addresses how people with injuries, not superhuman, can adapt. Unfortunately, because of the specificity of certain tasks, exoskeletons are not guaranteed to work in every situation, and this is due to many factors. Some surprising research is bridging the divide between the mind and the synthetic body, but we are still many years away from real super humans.
You can consider multiple areas of research. One of these areas is exoskeletons.
The National Science Foundation together with a company named Sarcos that builds commercial exoskeletons funds a project at Virginia Tech university. One of the researchers, Divya Srinivasan, who is an associate professor in the Department of industrial & Systems engineering describes her research areas in the following ways: human factors & Ergonomics, human movement control and coordination, biomechanics, human performance assessments and Augmentation, human robot interactions, physical activity interventions, and work-related musculoskeletal disorders.
The research she is doing is related to augmenting strength required in demanding physical tasks in industrial settings to minimize or prevent workplace injuries.
In an interview, she answers a question which helps us to understand what the current state of the art is:
"What are some of the areas of research you’d like to see tackled in the years ahead?
There is so much variability in people’s sizes that making exoskeletons that would optimally fit anyone in the population is a big challenge right now. There is also so much variability in how individuals perform tasks, the strategies they use, how they adapt when they feel tired or uncomfortable, and the effects of those strategies on performance and their own bodies.
So, when and how an exoskeleton can optimally assist any task performed by any individual are huge challenges that need to be tackled. While these are design challenges, on the evaluation side, the state of the art now is to test multiple use cases on several individuals – a sort of brute-force method that needs a lot of time and resources."
In the interview, she also outlines that there are many different types of commercial exoskeletons. Some broad market categories according to catalogue are consumer, industrial, medical, military.. Other broad types and classifications are answered according to many questions such as:
What body parts are actuated or powered? Is it powered? Is it mobile? How is it controlled? How is it built? What is the origin?
Military: One of the military exoskeletons that I looked at was being pitched as counter IED (improvised explosive device)tool. The investors were NATO and the UN. The experts being interviewed in the promotional materials for one of the suits called "the UPRISE tactical passive exoskeleton", explained that injury prevention through effective load bearing was a main design goal of the suit, because they had to carry heavy 45-50 kilo objects. The soldiers were wearing protective suits as well as using the exoskeleton.
NASA: Nasa also has an exoskeleton development program called the X1. It appears to also be designed for injury prevention of the lower body, reinforcing the lower back, knees, hips and ankles.
What is the state of the art?
If you go to the wikipedia entry on exoskeletons and look at the limitations and design issues, you will see a good list of problems that researchers are currently dealing with now. They talk about design problems such as power supply, the materials of the skeleton, the actuators, the joint flexibility, the power control and modulation, and the adaptation to user size variations. Here is a quote from the control section:
Power control and modulation[edit] "A successful exoskeleton should assist its user, for example by reducing the energy required to perform a task. Individual variations in the nature, range and force of movements make it difficult for a standardized device to provide the appropriate amount of assistance at the right time. Algorithms to tune control parameters to automatically optimize the energy cost of walking are under development. Direct feedback between the human nervous system and motorized prosthetics ("neuro-embodied design") has also been implemented in a few high-profile cases."
The cited "high profile case" is work at the Massachusetts Institute of Technology's Biomechatronics Lab. According to a 2018 BBC article, the lab aims to make exoskeletons that work in harmony with the body. They are using treadmill data and motion capture to determine how much people move their joints and muscles, then they will apply this" data to help people run or walk faster or more efficiently." The article links to a Ted Talk to an MIT professor who is a "bionic man", who has prosthetic legs. His bio in the ted talk says the following: "At MIT, Hugh Herr builds prosthetic knees, legs and ankles that fuse biomechanics with microprocessors to restore(and perhaps enhance) normal gait, balance and speed". In this ted talk, he describes how his nerves are connected to his legs in order to control them, however he has no touch sensation. He is attempting to design microcomputers that would enable him or another amputee to feel his legs. He calls his methodology "NeuroEmbodied Design". In this TED talk, he describes how his improved designs allow users to react more automatically to the environment. If the user encounters an obstacle in thier way, they know about it.
If you want to get deeper into the research and learn more about the state of the art, you can learn more about Hugh Herr's work at MIT or the work being done at Virgini Tech as just a starting point.
https://www.bbc.com/news/technology-44628872
https://www.ted.com/talks/hugh_herr_how_we_ll_become_cyborgs_and_extend_human_potential#t-104836
https://vtx.vt.edu/articles/2018/10/researchers-study-iron-man-like-exoskeleton.html
https://www.siliconrepublic.com/machines/divya-srinivasan-exoskeletons-virginia-tech
https://exoskeletonreport.com/
https://exoskeletonreport.com/product-category/exoskeleton-catalog/military/
https://exoskeletonreport.com/2015/10/books-on-exoskeletons-and-wearable-robotics/
https://www.ihmc.us/research/biologically-inspired-robots/
https://ntrs.nasa.gov/api/citations/20140000694/downloads/20140000694.pdf