Download or read book Transverse Motion of 8 Inch Projectile XM673 in the XM201 M2A2 Gun Tube Mk 16 and MCLG Gun written by Szu Hsiung Chu and published by . This book was released on 1973 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dynamic behavior of a projectile during acceleration in the gun tube requires a quantitative description, since, if balloting becomes excessive, undesirable conditions such as damage to fuzing, shell body engraving, inaccuracy of fire due to yaw, and yaw velocity at the muzzle may result. The approach taken in this report utilizes the equations of motion derived in an earlier report titled, 'Transverse Motion of an Accelerating Shell' to describe the balloting motion of the 8-inch XM673 projectile fired in the MK-16, MCLG gun, XM201 and M2A2 gun tubes. Most previous solutions which have appeared in published works to date discuss the problem in a simple way, or consider separately the main factors that effect projectile motion. Effects of friction forces at the bourrelet and the driving band, changes of the eccentricity and the location of the center of gravity, and the wall thickness of the shell were considered in this formulation. The analysis shows that the contact of the bourrelet on the gun tube is intermittent when the C.G. eccentricity is zero or very small and the contact is continuous when the eccentricity is large and that this parameter is the one that most affects the performance of the projectile and the associated fuze. The analytical results are presented in graphic form.

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1977 with total page 1414 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Annual Index written by and published by . This book was released on 1978 with total page 1062 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.

Download or read book Corroborative Measurements of the Transverse Motion of a Gun Tube During Firing written by T. E. Simkins and published by . This book was released on 1986 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents new measurements of transverse motion of the 30 mm (GAU-8) gun tube first reported at the Third Gun Dynamics Symposium in 1982. The measurements are unique and fully corroborated through the use of two independent measuring devices. In particular, the work discusses three items of interest. First, there definitely exists a 'base-line' transverse tube movement, the cause of which has yet to be determined. The magnitude of this motion is of the same order as that due to other causes intentionally introduced for study. Second, intentionally introducing an eccentric breech mass produces muzzle displacements in good agreement with theoretical models, provided the 'base-line' component is accounted for. Finally, the muzzle rotation created by the moving projectile - though insignificant when operating alone - is strongly coupled to, and capable of greatly modifying the rotation due to other causes. This coupling does not appear to strongly affect muzzle displacement. It is concluded that predictions from gun dynamics models which agree well with displacement measurements, may err greatly when used to predict muzzle rotation, the quality of which is of central interest.