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"Vehicles, Military."
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Series-Hybrid Powertrains: Advancing Mobility Control in Electric Tracked Vehicle Technology
This work focuses on developing a mobility control system for high-speed series-hybrid electric tracked vehicles, which operate with independent traction motors for each track. The scope of this research includes modeling a series-hybrid powertrain specific to military tracked vehicles and conducting an in-depth analysis of its dynamic behavior. Subsequently, this study conducts a critical review of mobility control approaches sourced from the literature, identifying key techniques relevant to high-inertia vehicular applications. Building on foundational models, this study proposes a robust closed-loop mobility control system aimed at ensuring precise and stable off-road vehicle operations. The system’s resilience and adaptability to a variety of driving conditions are emphasized, with a particular focus on handling maneuvers such as steering and pivoting, which are challenging operations for tracked vehicle agility. The performance of the proposed mobility control system is tested through a series of simulations, covering a spectrum of operational scenarios. These tests are conducted in both offline simulation settings, which permit meticulous fine-tuning of system parameters, and real-time environments that replicate actual field conditions. The simulation results demonstrate the system’s capacity to improve the vehicular response and highlight its potential impact on future designs of mobility control systems for the heavy-duty vehicle sector, particularly in defense applications.
Journal Article
Armored vehicles
Young readers learn about armored vehicles and the situations in which they are used.
Book
Data Acquisition for Condition Monitoring in Tactical Vehicles: On-Board Computer Development
This paper outlines the development of an onboard computer prototype for data registration, storage, transformation, and analysis. The system is intended for health and use monitoring systems in military tactical vehicles according to the North Atlantic Treaty Organization Standard Agreement for designing vehicle systems using an open architecture. The processor includes a data processing pipeline with three main modules. The first module captures the data received from sensor sources and vehicle network buses, performs a data fusion, and saves the data in a local database or sends them to a remote system for further analysis and fleet management. The second module provides filtering, translation, and interpretation for fault detection; this module will be completed in the future with a condition analysis module. The third module is a communication module for web serving data and data distribution systems according to the standards for interoperability. This development will allow us to analyze the driving performance for efficiency, which helps us to know the vehicle’s condition; the development will also help us deliver information for better tactical decisions in mission systems. This development has been implemented using open software, allowing us to measure the amount of data registered and filter only the relevant data for mission systems, which avoids communication bottlenecks. The on-board pre-analysis will help to conduct condition-based maintenance approaches and fault forecasting using the on-board uploaded fault models, which are trained off-board using the collected data.
Journal Article
Comparative Analysis of Energy Storage and Buffer Units for Electric Military Vehicle: Survey of Experimental Results
This paper deals with the analyses of batteries used in current military systems to power the electric drives of military vehicles. The article focuses on battery analyses based on operational data obtained from measurements rather than analyses of the chemical composition of the tested batteries. The authors of the article used their experience from the development test-laboratory of military technology. This article presents a comparative analysis of existing and promising technologies in the field of energy storage and buffering for military electric vehicles. The overview of these technologies, including the design, operating principles, advantages, and disadvantages, are briefly presented to produce theoretical comparative analyses. However, this article mainly focuses on the experimental verification of operational ability in varied conditions, as well as the comparison and analysis of these results. The main part of the article provides more experimental studies on technologies of energy storage and buffering using the results of several experiments conducted to demonstrate the behavior of each technology in different working conditions. The output parameters, as well as the state of charge of each technology’s samples, were surveyed in various temperatures and loading characteristics. The results presented in this paper are expected to be useful for optimizing the selection of energy storage and buffering solutions for military electric vehicles in different applications and functional environments.
Journal Article
Military Humvees : armored mobility
Soldiers describe the operation of Humvees in the field and introduce the MRAP (Mine Resistant Ambush Protected) vehicle.
Book
The impact of mechanical vibrations on pressure pulsation, considering the nonlinearity of the hydraulic valve
The article identifies some of the forces acting on hydraulic valves used in the civil and military vehicles. Particular attention was paid to the single-stage electrically controlled “on/off” hydraulic directional control valve. Special attention was focused on vibrations of hydraulic directional valve four ways, three positions (4/3) controlled by typical solenoids. Military vehicles can be a source of vibrations in low and high range of frequency. The spectrum of vibrations frequency is wide in this case. The value of the natural frequency of vibrations of the hydraulic directional control valve spool, whose body was affected by mechanical vibrations, was estimated. The paper shows that the natural vibrations of the directional control valve spool can coincide with the frequency of external vibrations acting on the valve from the ground. The mathematical description takes into account that when the spool is overdriven, the oscillating movement of the directional control valve spool is described by a model that takes into account the nonlinearity resulting from the fact that the spool is in the extreme position—it is a poor nonlinear mechanical system. The results of theoretical considerations were confronted with the results of experimental research. In addition, the presented modified model was used to assess the impact of the capacitance change on the value of the amplitude of pressure pulsations caused by the vibrations of the directional control valve spool.
Journal Article
Enhancing airless tire performance for military vehicles: natural rubber compound with carbon black Fillers N220 and N550 with dynamic mechanical analysis approach
During and after the COVID-19 pandemic, the world has become more aware of environmental concerns and the importance of sustainability. Using natural rubber instead of synthetic rubber is one step toward a greener environment in a variety of technological applications, including the fabrication of vehicle tires. The objective of this work is to optimize the formulation for the production of airless tires, primarily for military vehicle applications, using natural rubber. Two natural rubber types, SIR 20 and RSS 1, with carbon black variants N220 and N550 as reinforcing agents present novel synergistic effects, and potentially tailor the properties of the rubber compound more precisely to meet the demanding requirements of military vehicle tires. A comprehensive assessment was conducted to evaluate various physical, damping, processing, and mechanical properties under standard conditions and subsequent aging at 70 °C for 72 h. Comparative analysis against control samples revealed notable improvements, particularly in abrasion resistance, crucial for tire wear. The combination of RSS 1 and CB N220 showed significant enhancements in strength and rigidity, suggesting their viability as alternative fillers. Leveraging dynamic mechanical analysis (DMA) results, the rubber compound underwent optimization to meet airless tire requirements, encompassing durability, comfort, and performance. This nuanced understanding of rubber’s viscoelastic behavior holds paramount importance in designing puncture-resistant airless tires with optimal performance attributes. Combination of innovative materials and advanced characterization techniques to address the specific challenges of enhancing airless tire performance for military vehicles in challenging operational environments.
Journal Article