Showing posts with label aerodynamics. Show all posts
Showing posts with label aerodynamics. Show all posts

3/16/2013

Fundamentals of Organic Chemistry Review

Fundamentals of Organic Chemistry
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This book is an OK introductory organic chemistry text however I wanted more. I personally needed a book which gives a clear understanding of the basics and advanced concepts. I found two books which if used together produce the best results.
March's advanced organic chemistry and Organic chemistry by wade (6th edition).
These books are of tremendous help to me in understanding the fundamentals and also the more advanced concepts of organic chemistry. I also wanted to save money as I am doing further organic synthesis and other carbon chemistry subjects later on so I needed a book that is particularly good for reference.
If you are prescribed this book then go for it but I personally feel it doesnt really cut it for me. (I will edit this soon)

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Written for the short course-where content must be thorough, but to-the-point, FUNDAMENTALS OF ORGANIC CHEMISTRY, Fifth Edition provides an effective, clear, and readable introduction to the beauty and logic of organic chemistry. McMurry presents only those subjects needed for a brief course while maintaining the important pedagogical tools commonly found in larger books. With clear explanations, thought-provoking examples, and an innovative vertical format for explaining reaction mechanisms, FUNDAMENTALS takes a modern approach: primary organization is by functional group, beginning with the simple (alkanes) and progressing to the more complex. Within the primary organization, there is also an emphasis on explaining the fundamental mechanistic similarities of reactions. Through this approach, memorization is minimized and understanding is maximized.This new edition represents a major revision. The text has been revised at the sentence level to further improve clarity and readability; many new examples and topics of biological relevance have been added; and many new features have been introduced.

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3/01/2013

Modern Exterior Ballistics: The Launch and Flight Dynamics of Symmetric Projectiles Review

Modern Exterior Ballistics: The Launch and Flight Dynamics of Symmetric Projectiles
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Modern Exterior Ballistics
The Launch and Flight Dynamics of Symmetric Projectiles.
I Want to Keep This Book. Thanks to the auspices of interlibrary loan, it's mine for three weeks. That's not enough. This book really has said everything there is to say about the subject, except for the classified data you would need to calculate trajectories of actual projectiles in the inventory.
Chap 1. A Brief History of Exterior Ballistics - nice shadowgrahs of near sonic and super sonic projectiles. Large drawings of several shell types showing how they are dimensioned.
Chap 2. Aerodynamic Forces and Moments Acting on Projectiles - you have to read this chapter if you are going to understand the symbols.
Chap 3. The Vacuum Trajectory-high school math with interesting examination of the effects of firing up hill or down hill.
Chap 4. Notes on Aerodynamic Drag - just what it says. There is a nice set of shadowgraphs showing a shell at successive mach numbers from sub sonic to transsonic to supersonic. Discussion of ogives, Meplats, burning tracer (provides a little thrust and more range), fins, and yaw.
Chap 5. The Flat-Fire Point Mass Trajectory-if you assume that the trajectory is fairly flat (such as with all small arms, rifles, and tank to tank combat), the effect of verticle motion on the down range motion can be neglected. Approximate the drag function by a simple (and useful) analytic function and you get some managable equations.
Chap 6. The Siacci Method for Flat-Fire Trajectories - More of the above, only the integrals are tabulated for several standard drag functions (about five pages for each drag function). Those tables plus pencil and paper and you too can calculate how far the 0.308 bullet travels and how fast it is going when it hits and at what angle it strikes.
Chap 7. The Effect of Wind on Flat-Fire Trajectories - head winds, tail winds, cross winds: pretty much what you would expect.
Chap 8. The Point-Mass Trajectory - the point mass doesn't yaw or pitch so we only have to worry about its three linear velocities. It only has to contend with the zero yaw drag function, air density, gravity and the Coriolis force. (These last three data sets are not classified). A 417 line basic program is included. With this you can calculate your rifle shots better than you can aim.
Chap 9. Six-Degrees-of-Freedom (6-DOF) and Modified Point-Mass Trajectories - The whole enchilada. Three linear velocities and three rotational velocities are considered. They are all coupled to each other by nonlinear functions, and the (ten or so) coefficients are functions of velocity and air density. Fascinating graphs of gyrating pitch and yaw of a 105mm projectile as it goes down range are included. Then come the modified point mass trajectories. This simplification reduces the degrees of freedom from six to four which allows some of the coefficients to be set to zero while still revealing considerable interesting behavior. The forth degree of freedom is angular velocity of the bullet along its long axis.
Chap 10. Linearized Pitching and Yawing Motion of Rotationally Symmetric Projectiles - ok, another simplification: assume that the pitching and yawing motions are small and linearize the functions. There is still a nasty differential equation, but you can (sort of) solve it and predict such things as the stability of the bullet as it goes down range without a numerical integration.
Chap 11. Linearized Swerving Motion of Rotationally Symmetric Projectiles - same idea as chapter 10, but applied to the position of the projectile's center of mass.
Chap 12. Lateral Throwoff and Aerodynamic Jump - what to do about unbalanced projectiles.
Chap 13. Nonlinear Aerodynamic Forces and Moments. - I don't know; I ran out of time.

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Modern Exterior Ballistics is a comprehensive text covering the basic free flight dynamics of symmetric projectiles. The book provides a historical perspective of early developments in the 19th century, the technology leading to World War I and that throu

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2/23/2013

Automatic Control of Aircraft and Missiles Review

Automatic Control of Aircraft and Missiles
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Blakelock's book is probably the most practical flight control book out there for both planes and missiles. Unfortunatly fly-by-wire and some other newer methods now practicable because of increased on-board computing power are not really covered but are hinted at in places. This tome provides probably the easiest to understand approach to aircraft control in existance. Straightforward and oriented to a step-by-step approach, it beats many of the "classic" texts popular with many professors hands down. Being a controls kind of guy, I particularly enjoy his use of normalized stability derivatives which result in controller designs already in units that can be directly used for servomotor design. A good understanding of this book will be of enormous use to even the most moderm airplane control system designer. For many years this book has been the secret weapon of those "in the know".
This book is oriented almost exclusively to frequency domain methods but there is a state variable approach chapter. Currently, there is a return to state-space methods movement in progress but this material in Blakelock is mandatory even for understanding the state-space methods. Examine Stengel's new work Flight Dynamics.


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This Second Edition continues the fine tradition of its predecessor by exploring the various automatic control systems in aircraft and on board missiles. Considerably expanded and updated, it now includes new or additional material on: the effectiveness of beta-beta feedback as a method of obtaining coordination during turns using the F-15 as the aircraft model; the root locus analysis of a generic acceleration autopilot used in many air-to-air and surface-to-air guided missiles; the guidance systems of the AIM-9L Sidewinder as well as bank-to-turn missiles; various types of guidance, including proportional navigation and line-of-sight and lead-angle command guidance; the coupling of the output of a director fire control system into the autopilot; the analysis of multivariable control systems; and methods for modeling the human pilot, plus the integration of the human pilot into an aircraft flight control system. Also features many new additions to the appendices.

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1/21/2013

Mechanics of Flight Review

Mechanics of Flight
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"Mechanics of Flight" will become a classic in the aerodynamicist's library alongside Abbott and Von Doenhoff's "Theory of Wing Sections". Here's why:
* Coverage of topics in aircraft design is exhaustive. From balancing lift and weight for steady flight, on through off axis forces and moments from running propellers, to 6-dof formulas for aircraft dynamic modes, to how propeller location affects aircraft stability, and on and on. Great for both the beginner and the authority in aircraft.
* Often a completely thorough analysis including the minutest effects is presented along with a linearized or simplified method. The simplified analysis is so useful for rapid conceptual design and study of fundamentals, while the detailed analysis gives a complete grasp of the physics and phenomena involved. Plus, in simplifying a complex derivation, the reader is shown which parameters may be safely neglected and which require careful scrutiny, and what is engineering if not intelligently ignoring smaller effects to come up with a reasonable solution to a problem?
* The figures! Well thought out and consistent, the figures clearly illustrate the material.
* Actual aircraft data is used in the example and homework problems. I have a feel for the performance of several classes of aircraft simply from using this book.
* Phillips derives everything, and I mean everything using the fundamental laws of physics as the starting point. A student would be very well served to go through these derivations themselves. Phillips basically shows the student how to learn and how to think mathematically. No shortcuts here. I wish I had learned these things very early on in my own schooling.
* Phillips has included experimental data along with rigorous analytical derivation and computer numerical analysis. I believe that all three are necessary for a true understanding of fluid dynamics.
The bottom line: Buy and use this book! While it is true that the material is focused on subsonic flight, I work for a large airframer of supersonic aircraft and I find the principles and fundamentals to be extremely useful in my work. Whether you are a student or a professional, if you have an interest in aerodynamics this is THE book to use.

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Mechanics of Flight is a unique combination of theory and applications organized in a logical presentation. It affords readers extensive coverage of individual topics within flight mechanics, including overviews of aerodynamics and propulsion. It also offers a full range of modern and classical techniques for applying fundamental principles to the solution of engineering problems in fight mechanics. Mechanics of Flight explores the basic principles of flight mechanics with the help of many worked examples, starting with simple problems involving steady-level flight and building to more complex ones such as the analysis of turning flight and spins. Special coverage found here–and not in most books on the subject–includes a detailed presentation of the quaternion formulation for six-degree-of-freedom flight simulation, including treatment of efficient numerical integration methods.

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