The Use of Modeling and Simulation in Ground Vehicle Analysis

2001 ◽  
Author(s):  
Michael D. Letherwood ◽  
David D. Gunter
Keyword(s):  
Life Cycle ◽  
Modeling And Simulation ◽  
Dynamic Performance ◽  
Ground Vehicles ◽  
Reform Initiatives ◽  
Ground Vehicle ◽  
Acquisition Strategies ◽  
Simulation Based ◽  
Acquisition Reform ◽  
And Performance

Abstract In support of Department of Defense (DOD) mandated acquisition reform initiatives to reduce vehicle related life cycle costs and timelines, the Tank-automotive and Armaments Research, Development and Engineering Center (TARDEC) is using simulation-based acquisition strategies to investigate the dynamic performance of wheeled and tracked ground vehicles. These strategies are used throughout the vehicle development, testing, and fielding life cycle process. The paper will describe how modeling and simulation (M&S) is applied to answer a wide variety of design and performance evaluation questions. It will also depict a series of simulation-based engineering projects that build on the Army’s simulation investments as a tool to investigate and answer real-world vehicle design, acquisition, and engineering support questions.

A novel platoon topology and performance analysis with cloud brain control center for multi-functional unmanned ground vehicle

2021 ◽  
pp. 095440702110407
Author(s):  
Yue Zhao ◽  
Jun Ni ◽  
Jibin Hu
Keyword(s):  
Intelligent Transportation System ◽  
Controller Design ◽  
Stable Operation ◽  
Ground Vehicles ◽  
Control Center ◽  
Ground Vehicle ◽  
Controller Gain ◽  
Simulation Based ◽  
And Performance ◽  
The Given

Unmanned ground vehicles (UGVs) are of great significance to the development of Intelligent Transportation System (ITS). The UGVs are supposed to serve a large number of missions with multiple functions in civilian use. Therefore, it requires UGV to be grouped as a platoon to complete the given missions. A novel platoon topology, Vehicle-Cloud Bidirectional Leader (VCBDL), is proposed in this paper to provide the basement for the group control of multi-functional UGVs. The VCBDL topology takes consideration of a cloud brain control center, which is capable of analyzing and making autonomous decisions for the UGVs. In order to realize the stable operation of the platoon with VCBDL topology, this paper analyzes the design of the platoon controller based on the graph theory method and obtains the range of controller gain. The robustness of the running platoon is analyzed and the convergence range of the platoon robustness index is defined. The above conclusions are verified by simulation based on the control of the police-used patrol UGV. The simulation results demonstrate the effectiveness of controller design, and the robustness performance is investigated by simulated random platoon disturbance. In addition, the experiments with real shuttle UGVs testbeds platoon are performed to verify the performance of the proposed controller.

Modeling and Simulation Based Life-Cycle Engineering

2004 ◽  
Author(s):  
Ken Chong ◽  
Harold S. Morgan ◽  
Sunil Saigal ◽  
Stefan Thynell
Keyword(s):  
Life Cycle ◽  
Modeling And Simulation ◽  
Life Cycle Engineering ◽  
Simulation Based

Equipment Standardization Under Acquisition Reform

1998 ◽  
Vol 14 (02) ◽  
pp. 110-123
Author(s):  
Jan Sands ◽  
William Loughlin ◽  
Frank Lu
Keyword(s):  
Department Of Defense ◽  
Construction Process ◽  
Best Value ◽  
Acquisition Strategies ◽  
Large Numbers ◽  
Acquisition Reform ◽  
Commercial Off The Shelf ◽  
And Performance ◽  
System Approaches ◽  
Commercial Equipment

This paper discusses the ramifications of current Department of Defense (DoD) Acquisition Reform policies on Navy equipment standardization initiatives and provides an overview of the objectives and benefits of making "best value" end item selections during the design and construction process. The DoD initiative to implement acquisition reform by changing the processes by which defense system and equipment requirements are defined and communicated to contractors is having significant impacts on equipment standardization programs. The emphasis on the use of non-developmental and commercial-off-the-shelf items (NDIs/COTS) combined with naval ship system and equipment requirements being expressed primarily in performance terms creates the potential for the introduction of large numbers of commercial equipment to the supply support system. Approaches to maximizing equipment standardization efforts in the era of commercial-based acquisition strategies are described and examples of standardization approaches using recent ship acquisitions (Strategic Sealift, LHD 1, DDG 51, and LPD 17) are presented.. Possible approaches for the use of performance-based equipment databases and real-time linkages through the Internet with COTS manufacturers are discussed. Impacts that could change the structure of existing logistics support systems and result in substantial improvements in both cost and performance of shipboard equipment and components are addressed.

Using Modeling and Simulation to Evaluate Traction of Track Vehicles

2000 ◽  
Author(s):  
David D. Gunter ◽  
Michael D. Letherwood
Keyword(s):  
Dynamic Performance ◽  
Vehicle Design ◽  
Ground Vehicles ◽  
Ground Vehicle ◽  
Us Army ◽  
3 Dimensional ◽  
Tractive Effort ◽  
The Us ◽  
Vehicle Systems ◽  
Time Required

Abstract The US Army Tank-automotive and Armaments Command (TACOM) has the mission of procuring and managing the US Army’s fleet of wheeled and tracked vehicles. TACOM’s Tank Automotive Research, Development and Engineering Center (TARDEC) provides engineering and scientific support directed at maximizing the capability of all Department of Defense (DOD) ground vehicle systems and ensuring the safety of their personnel. In order to reduce the time required to deploy troops and equipment, engineers and scientists at TARDEC have been investigating modifications to ground vehicles that lead to overall increases in performance, especially in the areas of off-road mobility, and on-road stability and handling. This paper describes an effort to assess the dynamic performance of a track laying (tracked) Recovery Vehicle towing a disabled tracked vehicle whose weight is approximately equal to that of the Recovery Vehicle. Specifically, this paper will describe techniques employed to develop a 3-dimensional dynamic model of the vehicle combination, and apply the model to evaluate towing performance of the recovery vehicle. It also describes measures aimed at minimizing incidences of jackknifing when braking on downhill slopes, as well as vehicle design modifications that were modeled and simulated in efforts to reduce the combination’s jackknife vulnerability. These modifications included tow bar schemes that locked-out inter-vehicle yaw, and external surge brakes mounted on the towed vehicle. Techniques used to model and simulate the tractive effort available to the Recovery Vehicle on varied soil types are described as are analyses used to determine the combination’s ability to climb grades. Vehicle modifications aimed at increasing the tractive effort available, such as tow bar pitch orientation and track shoe geometry changes are also described.

Corporate Growth Strategies and Performance of Selected Savings and Credit Cooperative Societies in Nairobi City County, Kenya

2020 ◽  
Vol 2 (2) ◽  
pp. 19-30
Author(s):  
Hamida Mwilu ◽  
Reuben Njuguna
Keyword(s):  
Data Collection ◽  
Business Environment ◽  
Primary Data ◽  
Growth Strategies ◽  
Inferential Statistics ◽  
Market Expansion ◽  
Acquisition Strategies ◽  
Corporate Growth ◽  
Diversification Strategies ◽  
And Performance

The dynamic nature of business operating environment has called on business leaders to be strategic in their leadership roles if they are to sustain their competitiveness into the unforeseen future. Growth is important in Sacco’s because it is future oriented establishing ways in which the organizational operations can be aligned to future changes in the business environment to ensure that competitiveness is sustained. The SACCOs in Kenya have experienced problems in the past; some even shutting down therefore there is need for customer growth to be enhanced so as to increase their incomes so as to sustain the business. These SACCOs have to look for leaders and managers who can develop future targets, direct and lead other staffs towards meeting the firm’s objective and gaining a competitive edge. The aim of this study was an assessment of corporate growth strategies and performance in savings and cooperative societies in Kenya, Nairobi County. The study sought to determine the influence of market expansion, diversification strategies and acquisition strategies. The study target population was 41 licensed SACCOs in Nairobi County. The study used primary data to collect information, and the data collection instrument was a questionnaire which was given to the 41 operations managers in the 41 selected SACCOs. The data collection procedure was done by the researcher and drop-and-pick strategy will be applied. The data was coded and keyed in Statistical Package for Social Science (SPSS Version 23.0), and was analyzed using both descriptive and inferential statistics. For descriptive statistics was through mean scores, standard deviations, frequencies and percentages, while the inferential statistics was through regression analysis to establish the relationship between strategic leadership and customer growth. The findings were presented in tables and charts for easy understanding, interpreting, and describing the data. The study established that market expansion, diversification strategies and acquisition strategies as corporate growth strategies had a positive and significant effect on the performance of SACCOs in Nairobi City County. The study concluded that the SACCOs significantly employed market expansion strategies through improved branch network, customer base enhancement, new distribution channels and technological innovation. The study concluded that the SACCOs embraced a hybrid of the main diversification strategies, diverse products and services significantly. It was concluded that to a little extent the selected SACCOs in Nairobi City County have employed acquisition as a corporate growth strategy. The study recommends that the SACCOs should embrace integrate technology in the implementation of corporate growth strategies to enhance efficiency and effectiveness.  Further studies should be undertaken to establish the effect of corporate growth strategies on the performance of other SACCOs in other regions to establish the disparities or similarities among the financial sector players. 

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