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51	Drömmen om det perfekta vapnet : – en studie i brukarförväntningar Engström, Philip, Törnblom, Daniel January 2021 (has links) Sweden’s Defence Forces are in the process of procuring a new personal firearm to replace the current Ak5 (a version of the FN FNC) which has been in service for almost 35 years. There are many opinions on this matter and a great deal of interest among the future users, ie the soldiers and officers. Our study aims to develop a deeper understanding of the user expectations for this new weapon. We are using a qualitative, inductive method with semi-structured interviews and netnography.von Hippel’s lead user concept has been the main reference for the design of this thesis, which means that we have interviewed those users who are perceived to have more to gain from a product development than other users. A lead user is often knowledgeable in his or her topic, might be leading development within the topic and it is not unusual for the lead user to have a social standing permitting him or her to influence others regarding the topic. We have also used internet forums discussing firearms to broaden the study since we know that a lot of the current discussions are occurring online and we expect this trend to continue in the near future. On top of the characteristics users want in a new weapon, some other aspects have come to light during the course of our research, these are also discussed in the thesis. Why is there an unproportionate amount of time spent on discussing firearms? Is there a greater value to a personal firearm than just its function? What role should the user perspective play in the Swedish Armed Forces? What are the consequences of the users being dissatisfied with the product? What is the role of the assault rifle in the Swedish Defence Forces and what specific purpose is it meant to fill? Is it possible to fit all purposes with one single weapon, which has been the role of the Ak5 for long periods of time. How should the Swedish Defence Forces respond to the fact that heavy body armour is issued to Russian troops? The Swedish Armed Forces has made an attempt at involving the user perspective in the process but our study should be seen as an important complement to this effort. / Sverige är på väg att göra en anskaffning av ett nytt eldhandvapen för att ersätta Ak5 som snart har tjänstgjort 35 år i Försvarsmakten. Det finns många åsikter bland de framtida brukarna och intresset är stort. I vår studie försöker vi få en djupare förståelse för vilka förväntningar användarna, dvs. soldaterna och officerarna, har på det nya vapnet. Metoden vi har använt är en kvalitativ, induktiv metod med semistrukturerade intervjuer och netnografi. Vi har använt oss av von Hippels lead user concept (von Hippel, 2005) , vilket innebär att vi har intervjuat de användare som av olika skäl anses ha mer att ge i en produktutveckling jämfört med andra användare. Oftast är en lead user mycket väl insatt i sitt ämne, kan driva utveckling inom ämnet och har inte sällan en social ställning som gör att hen kan påverka andra brukares åsikt i ämnet. Vi har även breddat studien med analys av nätforum som diskuterar ämnet nästa eldhandvapen, då vi menar att mycket av diskussionen pågår just online och att även mycket av diskussionen i samband med och efter införandet kommer att ske i dessa forum. Förutom en bild av vilka egenskaper användarna vill ha i det nya vapnet, så har det under studien framkommit en del andra aspekter, vilka också diskuteras i uppsatsen. Varför läggs oproportionerligt mycket tid på att diskutera just eldhandvapen? Är eldhandvapnets betydelse större än själva funktionen? Vilken roll bör brukarperspektivet ha i Försvarsmakten? Vilka är konsekvenserna om användarna är missnöjda med produkten? Vilken är automatkarbinens roll i Försvarsmakten, dvs vilken funktion skall den fylla? Går det att lösa alla våra behov med ett enhetsvapen, vilket Ak5 i perioder har varit. Hur ska Försvarsmakten lösa problemet med att Ryssland utrustar sina soldater med tunga kroppsskydd?Försvarsmakten har gjort en ansats till att omhänderta brukarperspektivet men vi menar att vår studie är ett viktigt tillskott till detta. assault rifle lead user opinion leadership procurement product development user perspective automatkarbin brukarperspektiv inköp lead user produktutveckling åsiktsledarskap Övrig annan samhällsvetenskap Övrig annan teknik
52	Product development of a handguard : For AK4 weapon system/Heckler & Koch G3 Moreno Atienza, Troy, Keskitalo, Jesper January 2023 (has links) The AK4 rifle serves as the primary weapon for the Home Guard, an integral part of the Swedish Armed Forces. Introduced in 1964, the AK4 is the Swedish version of the Heckler & Koch G3 and functions as a fully automatic assault rifle. Among its components, the handguard holds significant importance, providing stability, improving accuracy and control, and protecting the user from heat generated by the barrel. Recognizing the need for optimization, an employee from the ALTEN Group, possessing military experience and expertise in the AK4, launched a project to enhance the ergonomics and versatility of the handguard in a cost-effective manner. This initiative stems from the excessively high cost of commercially available handguards, making them financially unviable for replacing the original handguard of every AK4 used by the Home Guard personnel. This project aims to design and develop a next-generation handguard for the AK4 rifle that addresses the current limitations of the existing handguard. The primary focus is improving the shooter’s performance by establishing a comfortable shape of the handguard, reducing the weight, and enhancing its compatibility with accessories. Additionally, the aim is to ensure the handguard is cost-effective for mass production and meets the requirements set by the Swedish Defense Materiel Administration. To achieve the aims, interviews and a comprehensive user testing study was conducted, collecting quantitative data in the form of participant ratings and rankings for different design concept while also gathering qualitative data through participant feedback that highlighted specific design features contributing to comfort. Additionally, a systematic material selection process was performed, involving the analysis and ranking of various materials based on properties such as weight, price, and specific mechanical properties. Furthermore, the manufacturing analysis relied mainly on conversations with industry experts possessing expertise in the field of plastic manufacturing. Upon conducting a detailed analysis, it has been determined that the ideal configuration for the final product is an octagonal shape. After careful evaluation, Polyamide 6 reinforced with 30% glass fibers has emerged as the most suitable material choice for the handguard. This material had the optimal balance between mechanical properties, thermal performance, durability, cost-effectiveness, and environmental impact. To produce 50,000 handguard units, the recommended manufacturing method was injection molding due to its compatibility with mass production and the advice received from industry experts. Considering the design and selected material, a substantial number of the requirements outlined by FMV could be fulfilled by conducting both theoretical analyses and practical experiments. AK4 rifle Home Guard Swedish Armed Forces stability accuracy control heat protection ergonomics accessory compatibility interviews user testing material selection mechanical properties thermal performance durability environmental impact injection molding Mechanical Engineering Maskinteknik
53	Untersuchung der Geschosswirkung in der sehr frühen Phase unter besonderer Berücksichtigung der Hochgeschwindigkeitsmunition / Study of bullet effects at a very early stage with special consideration of high-speed ammunition Siegmund, Bernward 13 November 2006 (has links) No description available. 610 Medizin, Gesundheit Medicine Ausschuss ballistische Gelatine ballistisches Pendel Druckwelle Druckverlauf Energieabsorption Energieverlust Einschuss Energieabgabe Fragmentation Frangible Training Ammution Gewehr Geschwindigkeit Geschosse gerichtliche Medizin Glasfaserhydrophon Geometrie Hochgeschwindigkeit Hochgeschwindigkeitskamera Hochgeschwindigkeitsmunition Jagdunfälle Kaliber Kavitation Kaliber Militär Munition Projektil Reflexion Rechtsmedizin Schallgeschwindigkeit Schussverletzungen Schusswaffen Schusswirkung Schusswunden temporäre Zielhöhle Tötungsdelikt Vollmantelmunition Wechselwirkung Wundballistik Zugwelle Zielballistik Zielpulsation ammunition ballistic gelatine ballistic pendulum bullet bullet hole calibre cavitation energy absorption energy emission firearm forensic medicine fragmentation frangible training ammunition full metal ammunition geometry glass fibre hydrophone gunshot wound high speed high speed camera homicide hunting accident interaction loss of energy medial jurisdiction military pressure progression projectiles rejects reflection rifle shot effect shock wave speed speed of sound suction waves target ballistics target pulsation temporary target cave wound ballistics 44.72 MED 590: Rechtsmedizin

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