Your Selections

Computer software and hardware
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Committees

Events

Magazine

Series

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

A Systematic Approach to Development Assurance and Safety of Unmanned Aerial Systems

Textron Aviation-Cory R. Laflin
  • Technical Paper
  • 2020-01-0043
To be published on 2020-03-10 by SAE International in United States
The unrestrained design space for unmanned aerial systems (UAS) presents challenges to accurate safety assessment and the assurance of development to appropriate levels of rigor within those systems. The established safety and development assurance standards and practices were developed for vehicles operating in highly controlled conditions with continuous oversight. The very nature of unmanned systems introduce new failure conditions, even in those systems operating within the strict rules of the National Airspace System (NAS), particularly failures of control and command, situational awareness, and control security. Beyond those, the new concepts of operation being conceived by UAS developers introduce their own new set of considerations with regards to operating in uncontrolled airspace, often in close proximity to bystanders. These new concepts require new technologies beyond those currently supported by the hardware and software development assurance processes. However, the established standards and practices of aircraft development assurance and safety assessment can be adapted for the broader world of UAS applications, provided that the considerations driven by the new concepts of operation can be identified and properly analyzed.…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

An Approach to Verification of Interference Concerns for Multicore Systems (CAST-32A)

Rapita Systems, Inc., Ltd.-Steven H. VanderLeest, Christos Evripidou
  • Technical Paper
  • 2020-01-0016
To be published on 2020-03-10 by SAE International in United States
The avionics industry is moving towards the use of multicore systems to meet the demands of modern avionics applications. In multicore systems, interference can affect execution timing behavior, including worst case execution time (WCET), as identified in the FAA CAST-32A position paper. Examining and verifying the effects of interference is critical in the production of safety-critical avionics software for multicore architectures. Multicore processor hardware along with aerospace RTOS providers increasingly offers robust partitioning technologies to help developers mitigate the effects of interference. These technologies enable the partitioning of cores for different applications at different criticalities and make it possible to run multiple applications on one specific core. When incorporated into system-design considerations, these partitioning mechanisms can be used to reduce the effects of interference on software performance. In this paper we describe a novel approach to verifying the effectiveness of RTOS interference mitigation on the final hosted software. We showcase the use of the proposed approach on the NXP T2080 multicore board. The approach follows a V-model based methodology in which high- and low-level requirements…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Real Time Simulated Test Platform for Electric Power Line Replaceable Unit Closed Loop Testing

Honeywell Technology Solutins Lab., Pvt.-Davendar Kashireddy, Kumar Sakinala
  • Technical Paper
  • 2020-01-0018
To be published on 2020-03-10 by SAE International in United States
Aerospace application Line Replaceable Unit (LRU) development is tedious process involving hardware development and software development. Detail testing to be performed as per design assurance level (DAL) level of the system in which the LRU used. LRU design and developed for control application of a system to be tested on the real plant/system. Early system requirements validation during development stage using real plant / system involves high risk causing damage to system impacts high lead time to fix the system or most of time system itself is not built yet or system not available at the location of LRU design and development for system functional testing. However real-time simulation environment can address these limitations of system testing. Real time simulation environment is one platform extensively used for control system validation during initial stage of LRU design and development by simulating plant model / system. Correctness of the control algorithm, software implementation, hardware design can be checked during design and development stage which reduces the errors later during system integration lab (SIL) test. Any real-time simulation…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Bosch On Board Diagnostic solutions for Motorcycles

Robert Bosch GmbH, Robert Bosch Engineering and Business Sol-H. Jessen, A. Kushal, A. Sabu, S. Hande, M. Tappe
  • Technical Paper
  • 2019-32-0513
To be published on 2020-01-24 by Society of Automotive Engineers of Japan in Japan
EU OBD legislation requirements will bring new challenges for motorcycle engine control from 2020 and 2024 respectively. This paper gives a perspective on the Bosch solutions for On Board Monitoring functions to implement the legislation requirements. Specifically the approach and validation results for the monitor for Secondary Air Injection (SAI) will be highlighted. OBD is well established e.g. for passenger car systems in worldwide markets with Bosch solutions covering different system configurations and legislation requirements. While a large portion of the required OBD monitors for motorcycles can be carried over from passenger car solutions with modifications and enhancements where needed, some specific monitors had to be developed from scratch. These new monitors are required for subsystems and components which do not exist in the passenger car environment, e.g. a controlled valve between the intake manifold and engine outlet of the motorcycle to implement secondary air injection. Special focus of this presentation is on the OBD monitoring of the secondary air injection control valve, where robustness is a challenge given the boundary conditions of only binary…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

Methodology using IPS for creation and installation of flexible components in stationary vehicles

General Motors, do Brasil-André Tognolli, Fernando Utiyke, Douglas Migliorini
  • Technical Paper
  • 2019-36-0125
Published 2020-01-13 by SAE International in United States
Through dynamic computational simulations it is possible to achieve a high reliability index in the development of automotive components, thus reducing the time and cost of the component can generate considerable levels of competitiveness and quality.This work suggests the validation of a methodology to create the virtual routes to find the best design of the flexible components influenced by force of gravity, thermal expansion or even the static balance between the anchor points and used to be designed and installed in the vehicle always in the nominal condition which in many cases diverge from the physical.With the difficulty of predicting mathematically the nonlinear relations of deformation and motion under the effect of forces and moments, we use the NX9 software in the creation of the dynamic movement motion to the motor and transmission assembly imposes on the flexible components through a routine mapped by Cartesian coordinates, simulating the characteristic movements of the vehicle in normal working situations.Using the software IPS - Industrial Path Solution, for the construction of the flexible model to be simulated, the…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

Powertrain Hardware In The Loop X Vehicle Hardware In the Loop: How to Optimize Their Use During the Software Development Cycle

FCA - Fiat Chrysler Automotive-Jeeves Lopes dos Santos, Elaine Cristina Guglielmoni Silva, Cleber Albert Moreira Marques, Gustavo Maximo Urquiza de Sá, José Henrique Silva, Mauricio Vianna de Resende
  • Technical Paper
  • 2019-36-0311
Published 2020-01-13 by SAE International in United States
The advance of technology and the demand for new features on vehicles has been challenging the automotive industry to find ways to speed up its development process, while increases the robustness and quality of its products. On this context, the embedded software development for vehicles has been directly impacted. In other words, the number of Electronic Control Units (ECUs) considerably increased on the past few years and the number of lines of code, as well as their complexity, have been exponentially increased. In order to deal with this new reality, besides the automotive test prototypes used during the development, the automotive industry has been using different virtual environment to develop, verify and validate its products. As an example, we can see an increase in the use of different Hardware In The Loop system architectures (HILs) such as Powertrain HIL (with real Engine and Transmission Control Modules - ECM and TCM) and Vehicle HILs (with real ECM, TCM, several other ECUs, and also several electronic components that composes the vehicle). Each of these options has its…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

Unsettled Domains Concerning Autonomous System Validation and Verification Processes

EllectroCrafts Aerospace-Fabio Alonso da Silva
  • Research Report
  • EPR2019012
Published 2019-12-30 by SAE International in United States
The Federal Aviation Administration (FAA) and the Department of Transportation’s (DOT’s) National Highway Traffic Safety Administration (NHTSA) face similar challenges regarding the regulation of autonomous systems powered by artificial intelligence (AI) algorithms that replace the human factor in the decision-making process. Validation and verification (V&V) processes contribute to implementation of correct system requirements and the development life cycle - starting with the definition of regulatory, marketing, operational, performance, and safety requirements. The V&V process is one of the steps of a development life cycle starting with the definition of regulatory, marketing, operational, performance, and safety requirements. They define what a product is, and they flow down into lower level requirements defining control architectures, hardware, and software. The industry is attempting to define regulatory requirements and a framework to gain safety clearance of such products. This report suggests a regulatory text and a safety and V&V approach from an aerospace engineering perspective assessing the replacement of the human driver from the decision-making role by a computational system. It also suggests an approach where aerospace guidelines can…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

A proposal for semi-analytical model of teeth contact with application to gear dynamics

Politecnico di Torino, Department of Mechanical and Aerospac-Carlo Rosso, Fabio Bruzzone, Tommaso Maggi, Claudio Marcellini
  • Technical Paper
  • 2019-01-2269
Published 2019-12-19 by SAE International in United States
In this paper a semi-analytical (SA) algorithm developed for the solution of the contact problem between two mating spur gears is presented and its application to the study of engagement dynamics is shown. Firstly, a quasi-static two-dimensional (2-D) approach is implemented to solve the contact taking into account several flexibility contributions related to the mating gears. In detail, a modified Hertzian model for the investigation of the real contact area considering the variable curvature of the profiles is developed. A comparison between this model and the classical Hertzian model is shown: the limitations of the classical method, for instance the possibility of analyzing bodies with varying curvatures and the peaks of pressure due to corner contact are therefore overcome. Furthermore, all the different tooth and gear deformations due to the meshing interaction are shown. This allows the computation of the Static Transmission Error (STE), main source of vibration and noise. The influence of tooth profile modifications is also highlighted. A comparison of the calculation of the STE with a Finite Element Method (FEM) model and…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

Effect of Tab Cooling on Large-Format Lithium-Ion Pouch Cells

Kasetsart University-Kanchai Theinglim, Poowanart Poramapojana
  • Technical Paper
  • 2019-01-2261
Published 2019-12-19 by SAE International in United States
Battery thermal management systems can extend service life time while operating Lithium-ion batteries in hot and humid climates. To study thermal and electrochemical behaviors of a large format cell for the tab cooling method, this paper presents a Dual Potential Multi-Scale Multi-Domain (MSMD) approach using the equivalent circuit model in ANSYS Fluent software. A pouch cell of 25 Ah consists of N1/3Mn1/3Co1/3O2 (NMC) cathode and graphite anode is used for the model validation. The simulation results present the effect of tab cooling temperature at different discharge rates as well as the effect of the cell surface area and its thickness.
This content contains downloadable datasets
Annotation ability available

WiFi-Based Technique Measures Speed and Distance of Indoor Movement

  • Magazine Article
  • TBMG-35610
Published 2019-12-01 by Tech Briefs Media Group in United States

A technique was developed that uses a combination of WiFi signals and accelerometer technology to track devices in near-real-time. The WiFi-assisted Inertial Odometry (WIO) technique uses WiFi as a velocity sensor to accurately track how far something has moved — similar to sonar but using radio waves instead of sound waves.