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Some Books Recently Received

Some Books Recently Received 76 AIRCRAFT ENGINEERIN G March, 1941 Solution of Torsional Vibration Problems Archaeology in Britain then the total is obtained by adding up. This referred to earlier in the book is developed so Practica l Solution of Torsional Vibration Problems . Vol. I, Second Edition. By method is often necessary as different cylinders as to enable such details to be brought within Dr . W. Kerr Wilson. [Chapman and Hall. in the same engine have different inertia the scope of normal calculation with hope of values ; moreover for a frequency calculation reasonable accuracy. 42s.] requiring the separated cylinders, this latter For instance such details as a flexibly con­ REVIEWE D BY C. WHITTINGHAM method would save unnecessary work. It is nected flywheel rim-to-boss, or an aero-engine- noted that Dr. Wilson himself proposed this airscrew having flexibility usual in such, a method in a following paragraph, but only for When the first edition of this book was component, are subjects that come within the steam engines. published five years ago, it was considered to be scope of this final chapter. something different in Engineering textbooks. The next chapter deals with the development The bibliography at the end of the book gives I t presented the "last word" on the subject of flexible couplings. Considerable expansion perhaps the most comprehensive list of publica­ with which it dealt. of the theory of flexible spokes and spring- tions on vibration subjects the writer has seen, plate couplings is given, but it is questioned The author has now revised his work and and it must inevitably put the student on the whether too much space has not been devoted divided it into two volumes. The first of these track of further writings. to the theory in view of the fact that much of has just been published, and it is a worthy Finally, the things that are pleasing in this such work is in the hands of firms specializing successor to the earlier work. book are the thoroughness of detail in all in such developments. An interesting section The high quality originally set has not only directions, the wealth of really useful (not is tha t devoted to the comparatively new but been maintained, but here and there has been academic) worked examples, the simplicity of important development of rubber-in-shear the mathematics (on wha t is acknowledged to be improved upon; many new examples and sec­ couplings, and the data on rubber and such a difficult subject), the scrupulous attention tions have been added. couplings together with the accompanying paid to units and symbols, the clear definition Tha t a new and enlarged edition of an diagrams should prove very valuable to those of such matters as "flywheel effect" and Engineering textbook of such specialized nature interested in the solution of such problems. "momen t of inertia" and the way in which is warranted after only five years is, in itself, a t times the text literally halts to give several sufficient proof of its character. Provided tha t development takes place on the paragraphs of lucid by-the-way explanation. Dr. Wilson is an acknowledged expert in the right lines, it is believed that these couplings solution of vibration problems, in particular will play an important part in future solutions For the student, the lecture room, the design of T.V. problems. problems of torsional vibration in the internal and drawing office, the practical engineer and combustion engine having been his speciality. The fifth chapter contains new work on geared consultant, no matter how remotely connected The expert knowledge made real by his intimate systems, particularly in relation to the various with this subject, there is something of value contact with industry is mirrored in the book. complexities that may arise with multi-shaft in this book. The price is 42s. and it is worth arrangements. The tabular method is here it. The publishers. Chapman & Hall, must be Reference is made in the preface to several again well developed. It is sometimes not congratulated on producing more than 700 new studies and sections, which form a compre­ hensive statement of development in the past realized to what extent a marine installation pages of clear type in a normal size of volume. few years. can become complex, and examples of such arc also adequately treated. Chapter 1 develops the theory of angular Prehistori c England. By Grahame Clark. vibration along, at first, the familiar path of Geared acro-engine-airscrew combinations are [B. T. Batsford. 8s. 6d.] S.H.M.; nevertheless it is so thoroughly handled developed and the various cases of different tha t no knowledge, other than normal applied types of gearing are worked out in some detail, I t is a relief indeed in these days to have a mechanics and mathematics, is necessary, and reference being made to both radial and in-line book to deal with which is concerned with the th e matter quickly develops to deal with engines. Very useful sections refer to airscrew affairs of the spacious days of peace. We do problems of shaft mass correction, nodal flexibility and the influence of auxiliaries. not know how many readers of AIRCRAFT ENGINEERIN G are familiar with the immense position, and special cases. Many pages are devoted to a further study debt that archaeology owes to aviation. The tha t has recently been recognized as another The introduction in the earlier volume of the possibilities in this direction were, we believe, complex development, particularly for geared lucid step-by-step explanation of the frequency first visualized during flights over the Middle tabulation method is again produced in Chapter engines, namely the "coupling effect" of shaft East in the Four Years' War, but it was not 2, and forms a very necessary stage. It is be­ frequencies with frequencies of the complete until 1920, or thereabouts, that the use of lieved that many who use this method will engine installation mounted upon flexible aeroplanes for the discovery of signs of ancient find this explanation enlightening, and there is engine supports. This is a matter which must civilization was a t all seriously taken up: Two no doubt that this tabulation still forms the inevitably receive much attention and the events in the subsequent history of the subject basis of frequency calculations. New work in exposition given is well worthy. perhaps stand out for the almost dramatic this chapter includes frequency calculations for Chapter 6 on stress determination has been natur e of the discoveries: the first was the automobile and acro-engine—airscrew com­ enlarged to nearly three times its previous size. revelation in an air photograph taken during binations, including radial and in-line types. I t is only half the story to calculate natural the summer of 1923 of the course of the avenue frequencies and paper resonance periods, the Noteworthy attention is paid in Chapter 3 a t Stonehenge and the second was the location, to the treatment of balance weights and crank­ remainder demands the knowledge sufficient to some ten years or so later, of the circle of holes, determine which periods are dangerous, and webs, whilst new tables and data on wood, constituting a similar relic to the stone circles the computation of stresses goes a good way in duralumin, and steel marine propeller and a t Avebury and Stonehenge, now known as achieving this. Reference may be made to the airscrew blades are included. The attention "Woodhenge. " The most faithful readers of diagrams and notes of crankshaft orders, and given to such details can only be appreciated AIRCRAFT ENGINEERING will remember that in perusal of these will simplify much of the by someone who has the task of dealing with our very first volume, in July 1929, we published work ; there is also much information on the such problems. an article on the subject by Mr. O. G. S. Craw­ "V " radial and marine engines. This chapter is a stud y of the many equivalent ford, who is, of course, the leading authority masses and a section is devoted to the crank­ This chapter cannot be passed without some in this matter, a portion of one of the illustra­ shaft and running gear of reciprocating engines. mention of the subject of harmonic analysis tions to which is, if we are not mistaken, The method used in one section could perhaps of the engine torque diagram, which is worked reproduced by Mr. Grahame Clark. be improved upon. To quote a paragraph out in some detail in these pages. Too often "Tota l moment of inertia of crankshaft and published data on this subject makes vague but This book covers the whole field of archæology unhelpful reference to Fouriri Analysis, but running gear of reciprocating engines is deter­ in a most readable and admirable manner, makes no attempt to give a further explanation mined by summing up the moments of inertia dealing with such details as pottery, jewels, of the crankshaft, and revolving and reciproca­ as to its application. It is possible after a weapons and tools, but the part played by ting parts of the running gear. The value per brief study of the matter in this chapter to deal aviation is evidenced by the fact that some 20 cylinder is then obtained by dividing by the fully with such problems. or more of the 110 photographs of all types of total number of cylinders." subjects reproduced are of photographs of Torsional vibration analysis sometimes con­ tains details that are so complex as to defy sites taken from the air. I t is suggested this is more frequently done normal mathematical treatment, and in an in the following way. First the moment of A most interesting and valuable book for all Appendix to this volume a method already inertia of each individual cylinder is determined, who care for these things. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aircraft Engineering and Aerospace Technology Emerald Publishing

Some Books Recently Received

Aircraft Engineering and Aerospace Technology , Volume 13 (3): 1 – Mar 1, 1941
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Emerald Publishing
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Copyright © Emerald Group Publishing Limited
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0002-2667
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10.1108/eb030751
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Abstract

76 AIRCRAFT ENGINEERIN G March, 1941 Solution of Torsional Vibration Problems Archaeology in Britain then the total is obtained by adding up. This referred to earlier in the book is developed so Practica l Solution of Torsional Vibration Problems . Vol. I, Second Edition. By method is often necessary as different cylinders as to enable such details to be brought within Dr . W. Kerr Wilson. [Chapman and Hall. in the same engine have different inertia the scope of normal calculation with hope of values ; moreover for a frequency calculation reasonable accuracy. 42s.] requiring the separated cylinders, this latter For instance such details as a flexibly con­ REVIEWE D BY C. WHITTINGHAM method would save unnecessary work. It is nected flywheel rim-to-boss, or an aero-engine- noted that Dr. Wilson himself proposed this airscrew having flexibility usual in such, a method in a following paragraph, but only for When the first edition of this book was component, are subjects that come within the steam engines. published five years ago, it was considered to be scope of this final chapter. something different in Engineering textbooks. The next chapter deals with the development The bibliography at the end of the book gives I t presented the "last word" on the subject of flexible couplings. Considerable expansion perhaps the most comprehensive list of publica­ with which it dealt. of the theory of flexible spokes and spring- tions on vibration subjects the writer has seen, plate couplings is given, but it is questioned The author has now revised his work and and it must inevitably put the student on the whether too much space has not been devoted divided it into two volumes. The first of these track of further writings. to the theory in view of the fact that much of has just been published, and it is a worthy Finally, the things that are pleasing in this such work is in the hands of firms specializing successor to the earlier work. book are the thoroughness of detail in all in such developments. An interesting section The high quality originally set has not only directions, the wealth of really useful (not is tha t devoted to the comparatively new but been maintained, but here and there has been academic) worked examples, the simplicity of important development of rubber-in-shear the mathematics (on wha t is acknowledged to be improved upon; many new examples and sec­ couplings, and the data on rubber and such a difficult subject), the scrupulous attention tions have been added. couplings together with the accompanying paid to units and symbols, the clear definition Tha t a new and enlarged edition of an diagrams should prove very valuable to those of such matters as "flywheel effect" and Engineering textbook of such specialized nature interested in the solution of such problems. "momen t of inertia" and the way in which is warranted after only five years is, in itself, a t times the text literally halts to give several sufficient proof of its character. Provided tha t development takes place on the paragraphs of lucid by-the-way explanation. Dr. Wilson is an acknowledged expert in the right lines, it is believed that these couplings solution of vibration problems, in particular will play an important part in future solutions For the student, the lecture room, the design of T.V. problems. problems of torsional vibration in the internal and drawing office, the practical engineer and combustion engine having been his speciality. The fifth chapter contains new work on geared consultant, no matter how remotely connected The expert knowledge made real by his intimate systems, particularly in relation to the various with this subject, there is something of value contact with industry is mirrored in the book. complexities that may arise with multi-shaft in this book. The price is 42s. and it is worth arrangements. The tabular method is here it. The publishers. Chapman & Hall, must be Reference is made in the preface to several again well developed. It is sometimes not congratulated on producing more than 700 new studies and sections, which form a compre­ hensive statement of development in the past realized to what extent a marine installation pages of clear type in a normal size of volume. few years. can become complex, and examples of such arc also adequately treated. Chapter 1 develops the theory of angular Prehistori c England. By Grahame Clark. vibration along, at first, the familiar path of Geared acro-engine-airscrew combinations are [B. T. Batsford. 8s. 6d.] S.H.M.; nevertheless it is so thoroughly handled developed and the various cases of different tha t no knowledge, other than normal applied types of gearing are worked out in some detail, I t is a relief indeed in these days to have a mechanics and mathematics, is necessary, and reference being made to both radial and in-line book to deal with which is concerned with the th e matter quickly develops to deal with engines. Very useful sections refer to airscrew affairs of the spacious days of peace. We do problems of shaft mass correction, nodal flexibility and the influence of auxiliaries. not know how many readers of AIRCRAFT ENGINEERIN G are familiar with the immense position, and special cases. Many pages are devoted to a further study debt that archaeology owes to aviation. The tha t has recently been recognized as another The introduction in the earlier volume of the possibilities in this direction were, we believe, complex development, particularly for geared lucid step-by-step explanation of the frequency first visualized during flights over the Middle tabulation method is again produced in Chapter engines, namely the "coupling effect" of shaft East in the Four Years' War, but it was not 2, and forms a very necessary stage. It is be­ frequencies with frequencies of the complete until 1920, or thereabouts, that the use of lieved that many who use this method will engine installation mounted upon flexible aeroplanes for the discovery of signs of ancient find this explanation enlightening, and there is engine supports. This is a matter which must civilization was a t all seriously taken up: Two no doubt that this tabulation still forms the inevitably receive much attention and the events in the subsequent history of the subject basis of frequency calculations. New work in exposition given is well worthy. perhaps stand out for the almost dramatic this chapter includes frequency calculations for Chapter 6 on stress determination has been natur e of the discoveries: the first was the automobile and acro-engine—airscrew com­ enlarged to nearly three times its previous size. revelation in an air photograph taken during binations, including radial and in-line types. I t is only half the story to calculate natural the summer of 1923 of the course of the avenue frequencies and paper resonance periods, the Noteworthy attention is paid in Chapter 3 a t Stonehenge and the second was the location, to the treatment of balance weights and crank­ remainder demands the knowledge sufficient to some ten years or so later, of the circle of holes, determine which periods are dangerous, and webs, whilst new tables and data on wood, constituting a similar relic to the stone circles the computation of stresses goes a good way in duralumin, and steel marine propeller and a t Avebury and Stonehenge, now known as achieving this. Reference may be made to the airscrew blades are included. The attention "Woodhenge. " The most faithful readers of diagrams and notes of crankshaft orders, and given to such details can only be appreciated AIRCRAFT ENGINEERING will remember that in perusal of these will simplify much of the by someone who has the task of dealing with our very first volume, in July 1929, we published work ; there is also much information on the such problems. an article on the subject by Mr. O. G. S. Craw­ "V " radial and marine engines. This chapter is a stud y of the many equivalent ford, who is, of course, the leading authority masses and a section is devoted to the crank­ This chapter cannot be passed without some in this matter, a portion of one of the illustra­ shaft and running gear of reciprocating engines. mention of the subject of harmonic analysis tions to which is, if we are not mistaken, The method used in one section could perhaps of the engine torque diagram, which is worked reproduced by Mr. Grahame Clark. be improved upon. To quote a paragraph out in some detail in these pages. Too often "Tota l moment of inertia of crankshaft and published data on this subject makes vague but This book covers the whole field of archæology unhelpful reference to Fouriri Analysis, but running gear of reciprocating engines is deter­ in a most readable and admirable manner, makes no attempt to give a further explanation mined by summing up the moments of inertia dealing with such details as pottery, jewels, of the crankshaft, and revolving and reciproca­ as to its application. It is possible after a weapons and tools, but the part played by ting parts of the running gear. The value per brief study of the matter in this chapter to deal aviation is evidenced by the fact that some 20 cylinder is then obtained by dividing by the fully with such problems. or more of the 110 photographs of all types of total number of cylinders." subjects reproduced are of photographs of Torsional vibration analysis sometimes con­ tains details that are so complex as to defy sites taken from the air. I t is suggested this is more frequently done normal mathematical treatment, and in an in the following way. First the moment of A most interesting and valuable book for all Appendix to this volume a method already inertia of each individual cylinder is determined, who care for these things.

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Aircraft Engineering and Aerospace Technology – Emerald Publishing

Published: Mar 1, 1941

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