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Four Best Practices for Software Testing

  • Magazine Article
  • TBMG-34972
Published 2019-08-01 by Tech Briefs Media Group in United States

Great quality assurance is what turns great software into great product. Testing is a crucial part of any software development process, whether to ensure safety in a medical device, to minimize risk in a financial application, or to improve user satisfaction in a web site. As consultants, Geisel Software works with a variety of organizations, gaining exposure to many different products, development processes, and testing approaches. This provides the firm with a unique opportunity to see what succeeds for almost any project, along with common blunders. Here are some of the best practices we've encountered or employed in software testing.

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EGR Cooler Field Return Rate Evaluation Based on Product and Application Variation

Cummins Inc.-Billy Holland
Senior Flexonics-William M. Rixon, Ryan Collins, Brian Costello
Published 2019-04-02 by SAE International in United States
The automotive industry drives some of the most stringent product requirements to ensure long product life and customer satisfaction. To demonstrate compliance with these requirements new and more accurate evaluation methods are needed. Thermal fatigue life in EGR coolers for heavy duty diesel applications have historically been a critical focus for engine OEMs. Being able to accurately evaluate product return rates due to thermal fatigue failures gives the OEM confidence that all end users will be satisfied, and allows program management to properly make fiscal decisions. Additionally, weight and cost optimization can be conducted with greater confidence. This is accomplished by accounting for product variation and application variation in thermal fatigue life evaluations. Including these variations requires a simplified numerical method to calculate product life, as tens of thousands of samples will be run through the analysis to represent real life random variation. First, time dependent component temperatures are calculated based on engine conditions. The component temperatures are used to determine strain, which is then used to evaluate thermal fatigue life. Appling this life calculation…
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Risk Analysis of Blockchain Application for Aerospace Records Management

Honeywell Aerospace-Vinay Kasimsetty, Susan Barlow
Honeywell International Inc.-Sujay Rao
Published 2019-03-19 by SAE International in United States
Blockchain as a technology has been successfully deployed in the financial industry. As the technology continues to mature, there are opportunities to use this to solve operational challenges in Aerospace. One of the common use cases is replacing paper records as a proof of compliance with a blockchain enabled distributed ledger.Commonly available open source blockchain frameworks have security ingrained in the components. However, replacing paper records with a blockchain based distributed ledger will require investigation of potential risks involved in the end to end usage of this technology for records management.The objective of this paper is to elucidate potential risks in an aviation record management workflow environment enabled by blockchain and suggest requirements to mitigate the risks.In addition requirements for Blockchain based systems will be proposed, which will guarantee minimum functional requirements like Protection of confidential informationIntegrity of the information in a recordSafeguards against unauthorized accessThe potential gaps are understood using an illustrative end to end blockchain based process along with their conceptual high level intermediate steps. For example: Authenticated trusted digital identities of the…
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Automotive Engineering: March 2019

Michael Robinet
  • Magazine Article
  • 19AUTP03_08
Published 2019-03-01 by SAE International in United States

We can debate how quickly the electrified, connected and autonomous future will arrive. But there is no questioning how profoundly its changes will impact the entire mobility ecosystem-OEMs, suppliers, dealers, finance, energy and road infrastructures, and customers.

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Proactive Cybersecurity Saves Healthcare Organizations from Data Breaches

  • Magazine Article
  • TBMG-33993
Published 2019-03-01 by Tech Briefs Media Group in United States

Over the past few years, healthcare organizations have increasingly become one of the leading targets for cyber criminals with data breaches exposing personal patient data, medical records, and financial information, resulting in millions of dollars of added cost to these institutions. As the healthcare organizations become savvier with their cybersecurity, the criminals just get more creative.

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Moving the goalposts of emission compliance

Automotive Engineering: November 2018

Michael Robinet
  • Magazine Article
  • 18AUTP11_03
Published 2018-11-01 by SAE International in United States

This industry has worked hard to reduce or at least control several critical risks. The effort has been key for all constituents, impacting strategic direction, the allocation of valuable human and financial capital, and enterprise profitability.

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Analysis of the Effects of Modeling Depth and Parameter Uncertainties on the System Behavior of a Multifunctional High Lift Actuation System

German Aerospace Center (DLR)-Andreas Schäfer, Michael Schmid
Published 2018-10-30 by SAE International in United States
Modeling and simulation have become an important aspect of the design and development process of aircraft systems. During the design of high lift actuation systems for example, the dynamic loads in the transmission are estimated by simulation. Nevertheless huge development efforts and financial resources are still invested in physical testing. These integration and testing phases take place at a late stage in the design process. Therefore, identified malfunctions and development errors lead to undesired iterations and thus to high costs as well as to an increased development time. This issue is emphasized as system complexity is rises continuously in conjunction with an increase in the number of interconnections and functionality. Hence, early and continuous virtual testing activities on the overall system level become increasingly important. In order to establish such a process, this paper analyzes the effects of modeling depth and parameter uncertainties on the overall system behavior considering nominal operation as well as failure cases. It identifies which test cases can be performed in which development phase depending on the information required. The modeling…
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Active Suspension: Future Lessons from The Past

SAE International Journal of Vehicle Dynamics, Stability, and NVH

ZF Commercial Vehicle Technology-Daniel Eugene Williams
  • Journal Article
  • 10-02-02-0010
Published 2018-06-18 by SAE International in United States
Active suspension was a topic of great research interest near the end of last century. Ultimately broad bandwidth active systems were found to be too expensive in terms of both energy and financial cost. This past work, developing the ultimate vehicle suspension, has relevance for today’s vehicle designers working on more efficient and effective suspension systems for practical vehicles. From a control theorist’s perspective, it provides an interesting case study in the use of “practical” knowledge to allow “better” performance than predicted by theoretically optimal linear controllers. A brief history of active suspension will be introduced. Peter Wright, David Williams, and others at Lotus developed their Lotus modal control concept. In a parallel effort, Dean Karnopp presented the notion of inertial (Skyhook) damping. These concepts will be compared, the combination of these two distinctly different efforts will be discussed, and eventual vehicle results presented. Most of the contemporary literature treated active suspension as a theoretical vibration isolation problem, but handling improvements from active suspension were even more impressive. Handling and actual hardware considerations motivated a…
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Range Extension Opportunities While Heating a Battery Electric Vehicle

Hanon Systems-John J. Meyer, Nicos Agathocleous
Hyundai-Kia America Technical Center Inc-Antonio Vespa
Published 2018-04-03 by SAE International in United States
The Kia Soul battery electric vehicle (BEV) is available with either a positive temperature coefficient (PTC) heater or an R134a heat pump (HP) with PTC heater combination [1]. The HP uses both ambient air and waste heat from the motor, inverter, and on-board-charger (OBC) for its heat source. Hanon Systems, Hyundai America Technical Center, Inc. (HATCI) and the National Renewable Energy Laboratory jointly, with financial support from the U.S. Department of Energy, developed and proved-out technologies that extend the driving range of a Kia Soul BEV while maintaining thermal comfort in cold climates. Improved system configuration concepts that use thermal storage and waste heat more effectively were developed and evaluated. Range extensions of 5%-22% at ambient temperatures ranging from 5 °C to −18 °C were demonstrated. This paper reviews the three-year effort, including test data of the baseline and modified vehicles, resulting range extension, and recommendations for future actions.
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Suspension Health Monitoring and Failure Prognosis Through Onboard SoC and Cloud Based Reporting

KPIT Technologies, Ltd.-Naveen Manuel, Jainendra Mishra
Published 2018-04-03 by SAE International in United States
Failures of automotive mechanical systems such as suspension systems, or “springs” while a vehicle is in operation is most often serious, and can sometimes incur financial loses or even fatal consequences. Spring failures result from either chronic overloading, poor driver behavior, severe duty cycle, or a combination of the aforementioned conditions. These conditions result in extraordinary fatigue, ultimately reducing the spring’s overall expected useful life. There has been a significant reduction in the cost of onboard computing making it economically viable to measure, record, and store various parameters that affect the spring life. An economical measurement system was designed that could plot the Load vs. Displacement graph (L/D) by simply measuring the spring’s displacement from its nominal (static) position. Previous methodologies have used expensive load cells; in our demonstration we prove that measurements can be taken much more economically using an array of Hall Effect type sensors. The L/D plots are stored and compared and a performance deterioration curve is plotted and an acute failure timeline is predicted, information of which is constantly relayed to…
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