By Irwin E. Alber
Engineers have to gather “Back-of-the-Envelope” survival talents to acquire tough quantitative solutions to real-world difficulties, fairly while engaged on tasks with huge, immense complexity and extremely restricted assets. within the case stories taken care of during this booklet, we express step by step examples of the actual arguments and the ensuing calculations received utilizing the quick-fire approach. We additionally exhibit the estimation advancements that may be acquired by using extra exact physics-based Back-of-the-Envelope engineering versions. those diverse equipment are used to acquire the ideas to a few layout and function estimation difficulties coming up from of the main complicated real-world engineering tasks: the gap trip and the Hubble house Telescope satellite tv for pc.
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Additional info for Aerospace Engineering on the Back of an Envelope (Springer Praxis Books)
Additional analysis will be necessary to model the diameter of the HST structural support frame in order to estimate (with BotE techniques) the outer diameter for the entire HST system. 3 m . This is the maximum diameter of the cylindrical aft shroud and bulkhead that encloses the scientiﬁc instruments, the subsystems, and the telescope’s focal plane structure. Sec. 7 Outline of this book 35 CONCLUDING REMARKS In summary, we have shown by our Quick-Fire case study examples that BotE methods allow us to quickly estimate the dimensions and performance for real engineering systems like the Shuttle and the Hubble Space Telescope.
They are assumed to be parallel, having come from an object at inﬁnity. The incoming rays reﬂect oﬀ the concave primary mirror and are directed by its curvature towards the on-axis focal point in accordance with the simple reﬂectance law in which the angle of incidence equals the angle of reﬂection. 9. What a simple BotE estimate for the HST length L looks like. Estimating the length of the Hubble Space Telescope’s two-mirror Cassegrain optics using simple BotE estimation techniques. 32 Introduction [Ch.
The system focal length, feq , is determined by the ﬁnal resolution requirements for the system. For the HST we require that the telescope be diﬀraction-limited, and this requires a very large system focal length. When ‘‘m’’ is large (as it is when feq is very large) it can be shown that the actual magnitude of ‘‘m’’ disappears from the key length scale estimate; thereby simplifying the calculation of optical package length. 9. Each of these parameters was chosen by the optical engineers at the Johns Hopkins Space Telescope Institute after extensive design tradeoﬀ studies.