Vehicle Integration Between Carl-Gustaf M4 and Trackfire
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Vehicle Integration between Carl-Gustaf M4 and Trackfire RWS A concept study on mechanical solutions Fordonsintegrering mellan Carl-Gustaf M4 och Trackfire RWS En konceptstudie på mekaniska lösningar Isabelle Dietmann Faculty of Health, Science and Technology Degree Project for Master of Science in Engineering, Mechanical Engineering 30 hp Supervisor: Anders Gåård Examiner: Jens Bergström 2020-07-04 Abstract Saab Dynamics is a division of Swedish company Saab AB, offering solutions, products, and services for military defence. Included in the Saab Dynamics portfolio is the Carl-Gustaf recoilless rifle; a man-portable, reusable, anti-tank weapon system. Another Saab produced system is the Trackfire Remote Weapon Station; a remotely operated weapon and sensor system, purposed for use on all types of military platforms. Armoured vehicles used by the Swedish Armed Forces are sometimes equipped with remote weapon stations that aim to provide the vehicle crew with protection, by allowing them to operate the weapons from inside the vehicle. These weapon stations can integrate a selection of different weapons, but there are currently no systems in operation that allow integration of the Carl-Gustaf system. This project was initiated based on a request from the Life Guards, for an integrating system between the Carl-Gustaf M4 and a remote weapon station. The project was conducted at Saab Dynamics, Karlskoga, in cooperation with Karlstad University, and aimed to generate suggestions of vehicle integration between the Carl-Gustaf M4 and a remote weapon station. The project was performed as a product development process, using a systematic method for construction and design to develop concept solutions of an integrating system between Carl- Gustaf M4 barrels, and the Trackfire RWS. The report includes a literature study, performed during a feasibility study, on the three systems: Carl-Gustaf weapon system, remote weapon stations, and wheeled armoured vehicles. Recoil principles and interior ballistics of recoilless rifles are further explained and applied to the study. The feasibility study resulted in a specification of requirements, which was used as a foundation for the concept development. Concepts of solutions were generated and eliminated using a brainstorming session, a morphological matrix, elimination matrices, and decision matrices. One concept was chosen as the final concept solution; a concept comprised of a construction that enables integration of four Carl-Gustaf M4 barrels on the Trackfire RWS, while dampening the recoil that comes from firing a gun. The construction was modelled and analysed using 3D design and engineering platform 3DExperience. Analyses revealed a strong construction that withstands forces arising when a weapon is operated, yet further analyses on how the construction would manage subjection to long-term vehicle vibration and weapon operation are required. Construction dimension optimisations are encouraged, as well as further development of construction details. Recommendations and suggestions on how to proceed with the system integration are provided as a final part of the report. Sammanfattning Saab Dynamics är en division i svenska företaget Saab AB, som erbjuder lösningar, produkter och tjänster för militärt försvar. Inkluderat i Saab Dynamics porfolio finns granatgevär Carl- Gustaf; ett bärbart, återanvändbart pansarvärnsvapen. Ett annat Saab-producerat system är Trackfire Remote Weapon Station; ett fjärrstyrt vapen- och sensorsystem, ämnat för användning på alla typer av militärplattformar. Pansarfordon som används av Försvarsmakten är ibland utrustade med fjärrstyrda vapenstationer som skyddar fordonsbesättningen genom att låta dem manövrera vapnen inifrån fordonet. Dessa vapenstationer kan integrera ett urval av olika vapen, men för närvarande finns det inget system i drift som tillåter integrering av Carl-Gustaf systemet. Detta projekt initierades baserat på en begäran från Livgardet, om ett integrerande system mellan Carl-Gustaf M4 och en fjärrstyrd vapenstation. Projektet utfördes på Saab Dynamics Karlskoga, i samarbete med Karlstads universitet, och syftade till att generera förslag på fordonsintegrering mellan Carl-Gustaf M4 och en fjärrstyrd vapenstation. Projektet utfördes som en produktutvecklingsprocess, och använde en systematisk metod för konstruktion och design för att utveckla konceptlösningar för ett integrerande system mellan Carl-Gustaf M4 eldrör och Trackfire RWS. Rapporten inkluderar en litteraturstudie, som utfördes under en förstudie, om de tre systemen: Carl-Gustaf granatgevär, fjärrstyrda vapenstationer och hjuldrivna pansarfordon. Rekylprinciper och inre ballistik hos granatgevär förklaras vidare och appliceras i studien. Förstudien resulterade i en kravspecifikation, som användes som grund för konceptutvecklingen. Konceptlösningar genererades och eliminerades genom användning av en brainstorming session, en morfologisk matris, elimineringsmatriser och beslutsmatriser. Ett koncept valdes ut som den slutliga lösningen; ett koncept bestående av en konstruktion som möjliggör integrering av fyra Carl-Gustaf M4 eldrör på Trackfire RWS, samtidigt som den dämpar rekylen som uppstår vid skjutning av ett eldrör. Konstruktionen modellerades och analyserades i 3D-design- och teknikplattformen 3DExperience. Analyser avslöjade en stark konstruktion som motstår de krafter som uppstår vid användning av ett granatgevär, dock är fortsatta analyser av hur konstruktionen skulle klara att utsättas för fordonsvibrationer och gevärsanvändning under en längre period nödvändiga. Optimering av konstruktionsdimensioner uppmuntras, så som fortsatt utveckling av konstruktionsdetaljer. Rekommendationer och förslag på hur arbetet med systemintegrationen kan fortsättas presenteras i slutet av rapporten. Acknowledgements I would like to express my deepest and sincerest gratitude towards my supervisor at Saab Dynamics, Elin Wallberg, for her constant support and encouragement. Special thanks to Urban Bruzén, for providing me with the opportunity of conducting this project, and for much needed guidance and feedback throughout the process. Thanks to Mats Lundkvist at the Life Guards, and Nils-Ola Svensson at Saab Järfälla, for organising interesting and rewarding visits, and providing essential information whenever needed. Tomas Pettersson and Linus Olsson; thank you so much for always answering my questions and for putting your own time aside to help me. Additionally, I would like to direct my gratitude towards my supervisor at Karlstad University, Anders Gåård, as well as the following people at Saab Dynamics who contributed with their expertise, and made this project an invaluable experience: Petri Hiltunen, Chamoun Malki, Jonas Björnsson, Martin Persson, Magnus Samuelsson, Burton Stopek, and Emanuel Hällgren. Isabelle Dietmann 2020-07-04, Karlstad Table of Contents Abbreviations and Symbols .............................................................................................................. 1 1 Introduction ..................................................................................................................................... 2 1.1 Background ....................................................................................................................................................... 2 1.1.1 Saab AB and Saab Dynamics ............................................................................................................. 2 1.1.2 Carl-Gustaf weapon system .............................................................................................................. 3 1.1.3 Remote weapon station (RWS) ....................................................................................................... 3 1.1.4 Armoured vehicle .................................................................................................................................. 4 1.2 Project definition ............................................................................................................................................ 5 1.2.1 Goals and purposes .............................................................................................................................. 5 1.2.2 Delimitations ........................................................................................................................................... 6 2 Theory ................................................................................................................................................ 7 2.1 Standard principles and equations .......................................................................................................... 7 2.2 Recoilless rifles ................................................................................................................................................ 7 2.2.1 Definitions and principles ................................................................................................................. 7 2.2.2 Carl-Gustaf weapon system .............................................................................................................. 9 2.3 Wheeled armoured vehicle (WAV) ....................................................................................................... 10 2.4 Trackfire RWS ............................................................................................................................................... 11 2.5 Current gun recoil systems .....................................................................................................................