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Weapon Center of Mass Calculator

The Weapon Center of Mass (COM) software allows researchers to easily determine mass properties of a weapon system. The tool presents a photograph of the weapon and allows the user to place weight anywhere on the weapon by clicking on the screen. After the weight is placed, the software returns the mass properties of the weapon, including the effects of the added weight. It is based on fundamental equations found in physics and biomechanics, and can determine the effects of as many as four added weights. The added weight can be accoutrements (such as new sights), additional weapons (such as a grenade launcher), or any other object that is mounted to the weapon.

One use of this tool is to determine where to place weight on the weapon to obtain specific mass properties. The user can manipulate the location and magnitude of mass added to the weapon, and the tool will produce output that includes COM location and moment of inertia (MOI) based on the mass properties of the weapon (with no added weight) and the location and magnitude of the added weight. The user can also determine the effect of adding accoutrements (e.g., weapon systems, scopes, etc.) to a weapon on the mass properties of the overall system. Given the mass properties of the unweighted system and the mass and location of the added components, the user can place these objects on the picture of the weapon and the software will output the resulting mass properties of the weapon system including the accoutrements.

The graphical user interface was designed to allow users to choose from a list of weapons. When the software is running, the first screen that is presented is a dialogue box. In this screen, the user simply double-clicks the weapon he or she wants to add mass to; as more weapons are studied, the list can be updated. After the user clicks OK or double-clicks the weapon to analyze, the analysis window opens. This is the main window used for placing weights on the weapon. The window has three main areas: the picture of the weapon, the input area, and the output area.

This work was done by Michael E. LaFiandra of the Army Research Laboratory. ARL-0054

Topics:
Biomechanics Computer software and hardware Crash research Exteriors Military vehicles and equipment Munitions Research and development Software Test facilities Tools and equipment Vehicles Windows and windshields
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Weapon Center of Mass Calculator

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    Defense Tech Briefs Magazine

    This article first appeared in the April, 2013 issue of Defense Tech Briefs Magazine (Vol. 7 No. 2).

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    Overview

    The document titled "A Tool for Calculating the Center of Mass and Moment of Inertia of Small Arms Weapons," authored by Michael E. LaFiandra and published by the U.S. Army Research Laboratory in July 2008, focuses on the development of a tool designed to enhance the understanding of mass properties in small arms weapons. This research is part of the NATO Research and Technology Organization (RTO) Task Group on dismounted Soldier system weapon systems interoperability, specifically addressing the integration and interoperability of infantry weapons.

    The project recognizes the diverse range of assault weapons currently in use, including various models such as the M4, M16, G3, FAL, and Steyr, each with different designs, firing mechanisms, and weights. A significant aspect of the research is the emphasis on the weight and center of mass (COM) of these weapons, which are critical factors influencing their usability and effectiveness in combat scenarios.

    The document outlines the objectives of the project, which include developing software algorithms capable of calculating the mass properties of small arms. It details the methods employed, including the creation of a graphical user interface (GUI) that allows users to input data and receive calculations for the center of mass and moment of inertia. The GUI is designed to be user-friendly, facilitating ease of use for military personnel and researchers alike.

    Additionally, the report includes sample analyses demonstrating the application of the tool in real-world scenarios, showcasing its practical utility in assessing weapon performance and handling characteristics. The findings aim to support military decision-making by providing accurate data on weapon dynamics, which can influence training, design, and operational strategies.

    In conclusion, this document serves as a comprehensive resource for understanding the mass properties of small arms weapons, contributing to the broader goal of improving dismounted Soldier systems. By addressing the technical issues and human factors associated with weapon systems, the research aims to enhance interoperability and effectiveness in military operations. The tool developed through this project is expected to play a vital role in future research and development efforts within NATO and allied forces.

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