Beyond battery power - CDE themed competition part 2
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The document discusses the limitations of battery power for small autonomous robots and soldiers. While small robots are attractive for defense applications like reconnaissance and patrolling, battery technology cannot provide enough energy density for more than an hour or two of operation. Fuel cells and generators are not feasible options at small scales either. However, the document suggests some potential solutions being explored, such as photovoltaic energy capture from flames, novel engine/generator combinations, or single-use power sources that could operate for a day before recycling. The goal is to develop alternative power sources that would enable the widespread use of smaller autonomous robots in defense applications.
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Beyond battery power - CDE themed competition part 2
- 1. Beyond battery power Future autonomy – removing a technology blocker OFFICIAL© Crown copyright 2014 Dstl 07 December 2016
- 2. Beyond battery power OFFICIAL© Crown copyright 2013 Dstl 07 December 2016 Are we at a RAS ‘tipping point’ ? • component prices have tumbled • complex autonomy increasingly mastered • defence has many dirty and dangerous jobs
- 3. • widespread use of RAS in defence attractive • robots, people, one team But … • big and powerful robots are dangerous complex, un-verified software • becomes unaffordable for small manufacturing scale products OFFICIAL© Crown copyright 2013 Dstl 07 December 2016 Beyond battery power
- 4. Beyond battery power This makes small automata attractive to defence: • resupply with many small robots • patrolling, sentry, reconnaissance • perhaps up to man-sized RAS, safer close to people than larger systems OFFICIAL© Crown copyright 2013 Dstl 07 December 2016
- 5. Beyond battery power Unfortunately, incompatible with battery weight: • an hour or two operation just isn’t enough • high energy density batteries already have issues OFFICIAL© Crown copyright 2013 Dstl 07 December 2016
- 6. Beyond battery power • not just a question of waiting for better batteries limited by the power density of active constituents not expected to improve much, even over 10-20 years • this ‘small robot’ problem • bigger robots can use fuel cells and diesel/petrol generators • dismounted soldiers also have big problems with batteries OFFICIAL© Crown copyright 2013 Dstl 07 December 2016
- 7. Beyond battery power OFFICIAL© Crown copyright 2013 Dstl 07 December 2016 Hydrocarbon power? • relatively safe compared with pre-mixed chemicals Any other lightweight energy ideas?
- 8. Beyond battery power OFFICIAL© Crown copyright 2013 Dstl 07 December 2016 So what might be possible? Literature suggests • photo-voltaic energy capture from flames • novel engine / generator combinations
- 9. Beyond battery power OFFICIAL© Crown copyright 2013 Dstl 07 December 2016 Detectability • future work-arounds a possibility • in phase one it’s enough to show how noise or thermal signature might be moderated
- 10. Beyond battery power OFFICIAL© Crown copyright 2013 Dstl 07 December 2016 New digital manufacturing techniques • complex structures have become inexpensive in small volumes • forming in plastics and metals, including higher temperature plastics
- 11. Beyond battery power OFFICIAL© Crown copyright 2013 Dstl 07 December 2016 Maybe a single use ‘power source’? • wearing out in a day or two could be fine • usage model like primary batteries not re-chargeable? • but recycling must be viable - low environmental hazard
- 12. Beyond battery power • RAS is (potentially) a big opportunity for MOD - if it uses smaller robots and not big powerful ones (Health and Safety issues) • MOD lacks long endurance power sources for smaller robots; but we think they can be made • we think the market is wider than just MOD, MOD RAS and ‘dismounted soldier’ OFFICIAL© Crown copyright 2013 Dstl 07 December 2016
Editor's Notes
- Add slides as necessary Keep text to a minimum
- Introducing the problem – Robotic and Autonomous Systems (everyone but MOD uses that term, it means the same as Autonomy) seem tantalising close but for MOD robots are very expensive and so little used Component prices have tumbled - batteries, motors, servos, sensors, telecoms, navigation, single chip computers Complex autonomy increasingly mastered Driverless cars
- This is why we are especially interested in small robots. We can embed small robots in human teams and use them in an ad-hoc way in close proximity to people, with little hazard. Big machines are dangerous to be near, you have to separate people from heavy machinery. In the case of RAS there is the extra problem that complex software is very hard to verify ie ‘prove’ it will always act in a safe and predictable way.
- Unfortunately we need small-ish but long endurance robots. They have to ‘keep up’ with people who can operate for days without resupply. Recently the Samsung Galaxy phone has become infamous for bursting into flames, but actually this is a well established problem. The Boeing Dreamliner had similar battery problems and MOD is well accustomed to high energy batteries posing hazard.
- Unfortunately we need small-ish but long endurance robots. They have to ‘keep up’ with people who can operate for days without resupply. Recently the Samsung Galaxy phone has become infamous for bursting into flames, but actually this is a well established problem. The Boeing Dreamliner had similar battery problems and MOD is well accustomed to high energy batteries posing hazard.
- And the battery problem is persistent. If you look at future chemistries being mooted, they are all limited by the energy density of their ingredients which is very inferior to hydrocarbon energy storage. For bigger machines, we solved this problem years ago. We just use heat engines and electric generators, more recently big fuel cells are becoming competitive. But these solutions are not, for whatever reason, available in ‘shrunk’ form
- So, can we solve the energy storage problem by using a fuel that mixes with something in the environment to produce power? In this case, electrical power? We know that better batteries start to look a bit like bombs and cannot ‘win’ this race anyway. So what can, in the ‘small and lightweight’ space? Nature has solved it using hydrocarbons. We have solved it, for big engines, using hydrocarbons. And we know they can be managed fairly safely. Hydrocarbon power? Favoured for bigger engines, and by living creatures Stores high energy per unit weight Do not have to carry oxidant (uses air) Relatively safe compared with pre-mixed chemicals Batteries And bombs? Any other lightweight energy ideas?
- But we want to pose the problem – lightweight compact power- and ask you how to solve it. We are pretty sure it can be solved, these are the kind of things we read about in research papers and from hobby experimenters. On the last idea (Wankel generator), its an area we have funded in the past a and while the result was a bit big it was well on the way. Microturbines including Tesla (1911 patent) Miniature conventional engines Stirling engine based generators Hydrogen storage plus generators Miniature Wankel engine generator?
- But we want to pose the problem – lightweight compact power- and ask you how to solve it. We are pretty sure it can be solved, these are the kind of things we read about in research papers and from hobby experimenters. On the last idea (Wankel generator), its an area we have funded in the past and while the result was a bit big it was well on the way. Detectability -Naturally we want this to be silent, invisible and cost effective - but we also want it to exist! Work around - For example a generator/battery hybrid could run silent on batteries then recharge using the generator
- And here are two final pieces of the jigsaw. Digital Manufacturing is coming of age, not least with low cost 3D printers. Basically we can now make small and complex mechanical structures, in small volumes, cheaply. So long as you do not want them to last forever! But we do not want them to last forever. If we have to change and recycle the power source in these little robots, that is fine. With the jobs we have in mind they are going to get lost and broken anyway, we are no more worried about replacing a power plant than a battery. So long as it is low environmental hazard / recycleable. Yes, we do know you can make small atomic batteries.
- And here are two final pieces of the jigsaw. Digital Manufacturing is coming of age, not least with low cost 3D printers. Basically we can now make small and complex mechanical structures, in small volumes, cheaply. So long as you do not want them to last forever! But we do not want them to last forever. If we have to change and recycle the power source in these little robots, that is fine. With the jobs we have in mind they are going to get lost and broken anyway, we are no more worried about replacing a power plant than a battery. So long as it is low environmental hazard / recycleable. Yes, we do know you can make small atomic batteries.