3D Printing †Applications for Space Exploration

3D Printing – Applications for Space Exploration Puneet Bhalla 3D Printing or Additive Manufacturing (AM) was first tested in 1983 by inventor Chuck Hull. Conventional subtractive manufacturing involves carving out items from a single block of material, whereas AM involves adding plastic or metal layer by layer according to a computer generated design to manufacture a product. Over the years a number of processes that differ in the method of depositing of layers and their binding have been developed. The technology in the earlier years did not evolve enough for it to find mainstream support and its use was restricted to production of computer generated models and prototype research. Advances in metallurgy, miniaturisation and processing have now made it a more viable competitor to conventional manufacturing. It is even being called the third industrial revolution. Commercial enterprises having recognised the transformative potential of 3D printing, both in designing and manufacturing, are increasingly investing in it. It allows faster design iterations, providing flexibility for refinements and variations and produces more accurate 3D scaled models for testing. This helps in accelerating product development and manufacturing with corresponding cost benefits. It helps overcome constraints of conventional manufacturing and allows for more precision in manufacturing to produce more complex parts. The process allows for more cohesive structures and components can be constructed using much fewer parts, making them lighter, sturdier and more efficient. Large factories with their assembly lines can also be done away with. Existing parts can now be redesigned and designers can be more audacious in their pursuits, stepping beyond the constraints of conventional design and manufacturing, while seeking innovative solutions or entirely new capabilities. T he manufacturing process requires less material, reduces wastage during production and is more energy efficient, making it potentially more environment friendly. Objects can be created on demand, thereby eliminating costs, logistical complexities and wastages related to surplus inventories. Initial printers were capable of handling single materials only but the multi-jet technology is allowing combining of materials to produce varied material properties – mechanical, thermal and chemical. Nanotechnology coupled with 3D printing promises exciting opportunities in the future. Already, availability of cheaper printers has made the power of designing and producing publicly available. This democratising of manufacturing has the potential to revolutionise innovation. Market researcher Gartner forecasts that worldwide spending on 3D printing will rise from $1.6 billion in 2015 to around $13.4 billion in 2018.[1] Despite the excitement, there are experts who say that the technology m ight only evolve to supplement the conventional mass manufacturing methods that will continue to be faster and cheaper. They instead favour its suitability for niche and customised production. Space exploration has always been costly due to its requirement of low volume, customised and at times unique components. 3D printing is being seen by the space industry as enabling to the development of future space infrastructure. Various RD efforts both for ground based as also in orbit manufacturing are being supported with an aim to develop parts that could meet the stringent high performance and high reliability criteria required for space operations. NASA along with US rocket engine maker Aerojet Rocketdyne has successfully tested a rocket engine injector and an advanced rocket engine thrust chamber assembly using copper alloy materials, in different configurations.[2] The components proved themselves in tests where they were subjected to pressures of up to 1,400 pounds per square inch and temperatures up to 6,000 degrees Fahrenheit to produce 20,000 pounds of thrust.[3] NASA has claimed that 3D technology enabled designers to create more complex injectors while at the same ti me reducing the number of parts from 115 to just two.[4] This resulted in more efficient processes and also provided better thermal resilience. While the traditionally constructed injectors cost about $10,000 each and took six months to build, the 3D printed versions cost less than $5,000 and reached the test stand in a matter of weeks.[5] These tests have provided confidence in the technology and paved the way for its use in replacing other complex engine components. Already, many small 3D produced parts are flying in space onboard US and European satellites and more are being developed. ESA and European Commission’s Additive Manufacturing Aiming Towards Zero Waste Efficient Production of High-Tech Metal Products (AMAZE) project, has 28 European companies as partners that are looking at perfecting 3D printing of high quality metal components for aerospace applications. NASA is also evaluating using the technology for manufacturing composite CubeSats. China has also started investing in this technology and on its last manned space mission in 2013, their taikonauts occupied customised 3D printed seats. In December 2014, Chinese scientists have claimed to have produced a 3D printing machine, which could be used during space missions. Private companies the world over are investing heavily in the technology for aerospace applications.Japanese Space Agency JAXA along with Mitsubishi is working at producing 3D components for a new large-scale ro cket that the two are expected to develop by 2020. Swiss company RUAG Space has built an antenna support for an Earth observation (EO) satellite that will replace a conventionally manufactured one after tests. The engine chamber of SuperDraco thruster to be used on the crew version of SpaceX’s Dragon spacecraft, capable of producing 16,000 pounds of thrust, is manufactured using 3D printing. A team of engineering students from the University of Arizona, with help from 3D printing company Solid Concepts, recently assembled a 3D printed rocket within a day and successfully tested it. Planetary Resources, a private company seeking space exploration and asteroid mining has collaborated with a company, 3D Systems for developing and manufacturing components for its ARKYD Series of spacecraft using its advanced 3D printing and digital manufacturing solutions.All these efforts are providing solutions that are cheaper, have lesser parts and have comparatively shorter developmental tim elines. In the future, the technology could be used for entire structure fabrication that would involve integrating many of the system’s geometries into structural elements during production. This would reduce the number of parts, eliminate most joints or welds, simplify the design and production, reduce the number of interfaces and make the system more efficient and safer. Such vehicles would better sustain the rigours of launch and space exploration. Integrated structures would even enable reconceptualising space architectures, impacting on their design, sizes and functionality. The most exciting opportunity is 3D printing of objects in space – an idea that has the potential to cause a paradigm change in the way we look at space exploration. The concept has been debated for decades and NASA has also conducted some experiments since theSkylab space stationof the 1970s. In 2010, it collaborated with a US company Made in Space to develop and test a 3D printer that could operate in microgravity aboard the International Space Station. The microwave oven sized printer, previously tested on suborbital flights, was installed on board the station on 17 November. After two calibration tests, on 24 November 2014, on command from the ground controllers, the printer produced the first 3D object in microgravity. The object was a faceplate of the printer itself, demonstrating that the printer could make replacement parts for itself. Initial results have shown that layer bonding might be different in microgravity, but this would have to be substantiated by further te sting on more such produced parts in the future. These parts will subsequently be returned to Earth where they will be compared with similar samples made by the same printer before launch and also analysed for effects of microgravity on them. This would help in evaluating the variance and possible advantages of additive manufacturing in space and in defining the roadmap for future developments. Meanwhile, Europes POP3D Portable On-Board Printer designed and built in Italy is also scheduled for installation aboard the ISS next year. Producing parts and structures in space potentially provides a host of benefits. Structures being constructed on Earth have to be built in an environment that is different from where they would operate. These parts also have to survive the vibrations and high ‘g’ stresses of launch. Freed from these constraints, novel space architectures, more optimised to the microgravity environment, can be imagined and developed. 3D printers in space would enable astronauts manufacture their own components and tools, undertake repairs, replace broken items and respond to evolving requirements without being dependent on support from Earth. This would bring down logistical requirements related to deployment of structures in space, while improving mission efficiency and reliability. NASA is even funding research into the possibility of making food in space using a 3D printer. This would overcome the current issues related to food shelf life, variety and nutritional requirements. It would be possible to have human missions of longer duration and venturing much further into space. Made In Space has an ongoing project R3DO that seeks to recycle 3D produced broken or redundant parts to create new ones, thereby helping reduce space waste. The technology in the future could be used for space based construction of large structures – even entire spacecraft in space. Another concept being envisaged is the use of 3D printing for construction of large housing structures, roads and launch pads using the resources available in-situ on celestial bodies. Concrete houses being produced through 3D printing have already been demonstrated. Both NASA and ESA are exploring printing of objects using Regolith, the powdery substance that covers much of the surface of the moon. Besides the huge savings in cost and time, such habitats would be more suited to the local hazardous environment. The printers could either be controlled from Earth or make use of automation technology on robots or artificial intelligence. These capabilities would be a great step forward for human interplanetary exploration. 3D printing is making rapid strides and its applications are being recognised by industry. Scientists are working to smoothen out the inefficiencies and shortcomings of the processes as also evaluating potential opportunities. Developments in the space domain are promising but these would have to be put through rigorous testing before being cleared for regular use. Qualification and verification standards that would eventually be defined for this new industry would have to be more stringent for use in space. More complex printers will have to be devised for construction of larger parts. Currently, most construction is focussed on building frames and structures but in the future would also require manufacturing techniques to producing working electronic components.[6] For production in space, bigger printers would bring forth issues of mass, volume and power requirements, each one of which is critical for space launch and operations. Some methods would also have to be devised to bring together the parts so produced. The new technology provides an avenue for space industries the world over to graduate to common standards of software as well as hardware. This would allow a larger pool of scientists and engineers coming together learning and benefiting from each other. At the same time, and the policy makers would also have to come up with requisite regulatory framework. In India, 3D printing technology is still in its infancy and its penetration is low among industry is low. Most institutions continue to use it for producing 3D Computer Assisted Design (CAD) models and for prototype testing. Some global additive manufacturing companies have gained foothold in India through collaborations and there are some indigenous initiatives too. Isolated research is being undertaken by some private and public sector entities including the DRDO. Private companies are collaborating with some engineering institutions like IITs to promote research. There is also the Additive Manufacturing Society of India (AMSI) that seeks to promote 3D printing Additive Manufacturing technologies. Applications for Defence and Aerospace are two important sectors that most companies are focussing on. ISRO chairman, after the successful Mars Orbiter Mission, mentioned 3D Printing as one of the technologies that he wishes to see Indian engineers build upon in the future. India has la gged behind in conventional manufacturing and metallurgy. It could leverage its advances in software technology and collaborate with international experts to initiate activities in this sunshine sector. While increased awareness and commercial benefits will drive industry to invest in the sector, space initiatives would require the government to play the vital supporting role while seeking participation from industry and academia. Investments would be required in planning and executing the supporting infrastructure required to enable fabrication processes, in creating knowledge and capabilities through education and training and for provision of adequate RD facilities. [1] â€Å"From earphones to jet engines, 3D printing takes off†, 09 November, 2014 [2] â€Å"3-D Printed Engine Parts Withstand Hot Fire Tests†, 14 November, 2014 [3] TheAerojet Rocketdyne RS-25engine powered NASA’sSpace Shuttleand will power the upcoming Space Launch System (SLS), a heavy-lift, exploration-class rocket currently under development to take humans beyond Earth orbit and Mars. [4] ww.space.com/22568-3d-printed-rocket-engine-test-video.html [5] http://www.space.com/22119-3d-printed-rocket-part-test.html [6] http://www.space.com/26676-3d-printing-international-space-station.html

Face and Social Media Essay

#1: Product – not just another knock-off Competing only on price was not what XiaoMi has chosen as their core strategy. Surely, their phones and tablets are cheaper than Apple’s and Samsung’s but, by far, not the cheapest ones in the market. There are cheaper smartphones that flood China, however all of them have a major flow – poor quality. Essentially, those devices are reverse-engineered versions of Samsung models built from cheaper materials. By coming up with a good quality phone at lower price range was the key strategic move that put XiaoMi firmly on the map. The phone has a robust case, high quality screen and a reasonable battery. It doesn’t break easily, unlike cheaper copycats that start having issues after just a few months of use. By building it’s own Android-based OS called MIUI, XiaoMi phones got new exciting features not found on standard Android devices as well as plenty of customization options. #2: Price – pay less now, pay more later XiaoMi has also realized that selling cheaper phones near their actual cost was not a sustainable long term strategy, so they decided to go with the Amazon’s model – just cover the cost of the devices and make money from selling content. Although, XiaoMi is often compared to Apple, especially considering the fact that their founder, Lei Jun, resembles Steve Jobs in his style and charisma, it is clear that XiaoMi’s true inspiration comes from Amazon. Also, XiaoMi mostly sells online which further reduces cost of sales and overheads related to brick and mortar stores or dealing with distributors and retailers. XiaoMi has also managed to harness the power of social media by not only broadcasting their messages and announcements but by actively engaging with their customers. Engineers are routinely encouraged to speak directly to consumers and use gathered feedback to refine software. #3: Place – gain strength at home first Although there are rumors of XiaoMi’s inevitable coming to North American and European markets, the company seems to stay focused on China with 97% of the shipments locally. It has been mentioned that their next target will be in South East Asia and, most likely, other BRIC countries. Recently, ex-Google executive, Hugo Barra, who himself hails from Brazil, has become new XiaoMi’s international face. It seems that the company is not in a rush to  go to more developed markets dominated by Apple and Samsung and prefers staying focused in its home base where the market is still booming. Perhaps, potential IP related troubles stemming from frequent accusations of possible infringements, also play role in choosing to stay away from US and EU for now. #4: Promotion – the power of word of mouth OK, this one got to be my favorite so I have to break it down. First of all, early on, they have pioneered flash style sales which were done with little or no advertising. Flash sales basically mean selling limited quantities during limited periods. They always create anticipation and urgency – great factors to win consumers’ minds and hearts. Needless to say, the units were sold quickly and talked over a lot all over China’s vibrant social media. Word of mouth marketing worked very well for XiaoMi and they continue to take full advantage of it. #5: Promotion – active use of social media XiaoMi has also managed to harness the power of social media by not only broadcasting their messages and announcements but by actively engaging with their customers. Engineers are routinely encouraged to speak directly to consumers and use gathered feedback to refine software. #6: Promotion – dedicated brand advocates Through its active role in social media, XiaoMi has also succeeded in building a dedicated fan base. Those Mi-fans are very active in social media and are, in some ways, similar to those hardcore Apple advocates that we are all familiar with. Mi-fans are always present at XiaoMi’s product launches where they are known for loud cheering and applauding. #7: Promotion – CEO as the face of the brand Last but not least, XiaoMi’s charismatic boss, Lei Jun, does a great job in making his brand look cool and current. He has put a face to a brand, something that traditional executives in China wouldn’t feel comfortable doing. Lei Jen’s similarity to Steve Jobs in the ways he talks about the brand is not a coincidence – the late Apple’s founder still holds an almost iconic image among Chinese.

Botswana: A Diamond in the Rough Essay

1) The Harvard case, Botswana: A Diamond in the Rough, describes the exceptional case of Botswanas sustained economic rise from near absolute poverty to a country with a 10% average annual GDP growth for more than four decades. This case shows that healthy economic gains can be achieved by a mixture of formal institutions and ad hoc substitutes for missing institutions. When Botswana gained its independence in 1966, the country lacked many of the institutions deemed essential for economic growth by most prosperous developed nations. These absent institutions included a central bank, a national currency, basic administrative structures, market institutions, and the ability to connect to the global markets and apply external tariffs. Yet, Botswana was unique among its neighbors in that it held institutions such as a stable, democratic government supported by a charismatic leader and a constitution which upheld the liberties of a free press, legal transparency, and property rights. Botswanas institute of government also lacked the discriminatory practices and internal strife present in many of the neighboring countries. Botswana was able to supplement its lack of many formal institutions with substitute ad hoc solutions which filled many gaps. The countrys initial lack of its own central bank and national currency was supplemented with the countrys use of the South African Monetary Union until Botswana was able to establish its own currency and central bank in 1976. Similarly, Botswana relied on the South African Customs Union (SACU) for application of import tariffs used to raise tax revenue and protect infant domestic industries. Gaps left in the countrys infrastructure by weak public funding and an underdeveloped private sector were patched with help from financing and administration given by multinational firms, development institutions, as well as the creation of some of its own formal institutions. The most prominent of these situations was the countrys brokered relationship with the DeBeers Corporation which provided the country which technical expertise in a highly profitable industry, the establishments of diamond townships complete with working infrastructure, as well as a much needed source of  revenue. Botswana also used funds derived from development aid organizations and the financing agents such as the World Bank and the Canadian International Development Agency to substitute for its lack of private equity markets and banks. In addition, the country used the publicly traded company, Botswana RST, to attract foreign investment to aid in fully exploiting their natural resource potential. Investors in this company included multinational mining firms including AMAX and Anglo-American. Botswanas history of stability and protection of intellectual property rights also contributed to private foundations and major drug companies such as Harvards AIDS Institute, Bill and Melinda Gates AIDS initiative, and Merck helping to combat the brutal onslaught of the AIDS virus in the country. Botswana used a series of national development plans established by its Ministry of Finance and Development to guide future government spending. Contributions and returns from foreign investment were reinvested into infrastructure and education, while budget surpluses were stockpiled to hedge against sudden drops in revenue caused by potential downturns in the diamond market. Institutions such as the Mineral Right in Tribal Territories Act vested mineral rights in the central government rather than the hands of the tribal leaders while the two special funds, the Public Debt Service Fund and the Revenue Stabilization Fund, were established to funnel mining revenues into loans for local authorities and parastatal bodies. The Botswana Housing Corporation was a formal institution which used diamond revenues to finance construction projects while the Botswana Power Corporation and the Water Utilities Corporation were created to serve similar functions for electricity and water. The Botswa na Development Corporation, National Development Bank, and the Botswana Enterprise Development Unit were charged with allocating diamond revenue to diversify the economy. Botswana’s institutional development was a process. It began with virtually no formal institutions. Informal solutions led to the development of formal institutions, which allowed for Botswana’s idiosyncratic economic stability. 2) The most evident pro of nationalizing Botswanas diamond industry would be to achieve the short-term gains by selling stockpiled diamonds. Unfortunately, doing so would cost Botswana years of established credibility as it would require the country to renege on their previous agreements with the DeBeers Corporation. Such an action would deter future investors into Botswana, as well as cause the loss of their largest foreign investor, DeBeers. Loss of the DeBeers connection would cost Botswana the future gains associated with continued expertise in the field of diamond mining, infrastructure improvements historically provided by DeBeers in areas servicing the mines, and also the administrative capability of a major international corporation. The most significant con would likely be the loss of DeBeers as a steward of the cartel practices necessary to preserve the price premium associated with stockpiling diamonds. If left to navigate the sales and stockpiling of diamond by itself, the country would face the historically difficult task for a poor government that relies heavily on commodity sales to self-regulate commodity sales, and thus government revenues, while still balancing the demands of maintaining the cartel. 3) The extent to which Botswanas model is replicable outside of Botswana would certainly depend on a variety of factors some within the control of central governments, and others environmentally or socially determined. The presence of an extremely valuable natural resource(s) is a key component in Botswana growth model. While other countries also share this component, many lack the peace and stability associated with a stable government body and a tolerant society. Botswanas government offers stability and social climate free of the restrains presented by ethnic, tribal, and religious conflicts. Additionally, mining interests are centrally controlled and not subject to regional battles over mineral wealth. Likewise, discrimination between groups is not a prevalent issue in this country. Botswana also benefited from Tsekedi Khamas strong leadership in bringing new policies to the forefront and unifying the countrys economic policies among the various tribal groups. The countrys adherence to prudent social and macroeconomic policies also held a large role in the creation of an  atmosphere of growth and foreign investment. The credibility established through years of sound economics practices, legal transparency, property rights, stable government, and free press created a more welcoming environment for foreign investment than many other developing nations. The extent to which this model is replicable outside of Botswana depends on the level of faithfulness to the social and macroeconomic policies described above and a working mix of formal institutions and adequate substitute organizations. Although a full range of formal institutions are not necessary to achieve continued economic growth, substitutes must arise where the institutions are lacking to provide the necessary functions lost by their absence.

Mainframes and Personal Computers - 808 Words

Compare and Contrast Mainframes and Personal Computers Overview Mainframes and personal computers have evolved over the years but their core functions have stayed the same. The mainframe is used connect multiple users for large organizations while personal computers are generally used for a single users. The more drastic changes for mainframes and personal computers have been speed and size. Mainframes use to be the size of buildings. Now they are the size of a textbook. Personal computer s origins came from the dumb terminal. The dumb terminal was used just to access the mainframe. Then, the idea came to off load some of the processing from the mainframe and place it on your desktop. Compare The hardware is very similar†¦show more content†¦Extra security and stability is needed. Resetting a mainframe should not happen as often as a personal computer. This is because a mainframe will affect hundreds to thousands of users. The mainframe supports many users. Multiple processors are needed to handle the extra load that mainframes receive. Multiple processors are the standard for mainframes while it is only an option for personal computers. This helps the mainframe s stability because a backup processor can be used in case of a failure. This is also what makes the operating system more complex then the personal computer. Stability is expected for the mainframe more than a personal computer. The mainframe is also expected to run 24 hours a day 7 days a week. This is why stability is so important with the mainframe. The mainframe does not stop working when everyone goes home. The cost of the mainframe encourages the users to use it as much as possible. Conclusion Mainframes and Personal computers were drastically different when they were first introduced. The mainframe took up buildings and the personal computer was only an interface to a mainframe. Today, their similarities are growing. Eventually we will not be able to tell the difference. 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