Abstract We present a recently developed computational scheme for the numerical simulation of flow induced sound for rotating systems. Thereby, the flow is computed by scale resolving simulations using an arbitrary mesh interface scheme for connecting rotating and stationary domains. The acoustic field is modeled by a perturbation ansatz resulting in a convective wave equation based on the acoustic scalar potential and the substational time derivative of the incompressible flow pressure as a source term. We use the Finite-Element (FE) method for solving the convective wave equation and apply a Nitsche type mortaring at the interface between rotating and stationary domains. The whole scheme is applied to the numerical computation of a side channel blower.
Abstract One method to lower noise in a cabin is to position damping layers on vibrating panels, thereby reducing their radiated power. To assess the damping effect, criteria like the ERP (equivalent radiated power) are widely employed, which estimate the radiated sound power of a panel without taking into account the actual complex system. Advantageously only a part of the structure has to be modeled, but the optimal solution found on the simplified model then often fails for the complete, coupled system, especially if several variants of a cabin have to be considered. Hence, it is proposed to use the structure-only optimization for identification of a set of candidate solutions for optimal positioning of damping layers. These candidate solutions used as initial designs for the coupled investigations should be well distributed in the design space to avoid being wrongly stuck in an optimum with inferior coupled performance.
History of SAE Committee A-10.
This document provides informational background, rationale, and data (both physical testing and computer simulations) used in defining the component test methods and acceptance criteria described in SAE Aerospace Recommended Practice (ARP) 6330. ARP 6330 defines multiple test methods uses to assess the effect of seat back mounted IFE monitor changes on head blunt trauma.
Executive viewpoints Industry leaders offer their insights on the state of the heavy-duty on- and off-highway industries in this annual series of opinion pieces. The executives share their views on the most pressing technologies and trends shaping their business and the industry moving forward. Annual Product Guide Top products from throughout the industry covering technologies such as Powertrain & Energy, Hydraulics, Electronics, and Testing & Simulation.
A 24-hour battle of speed and efficiency At Le Mans this month, amped-up hybrid prototype racecars from Audi and Toyota face a revamped Porsche 919 hybrid, while Ford hopes to recapture glory with its new GT-R. Pushing the ICE forward, gradually Emergent technologies from BorgWarner, Eaton and Mahle aim for greater efficiency in gasoline and diesel engines. Smile, you're on Magna camera! Magna Electronics is rapidly expanding production of its made-in-U.S.A. onboard cameras to keep pace with booming OEM demand for safety and vehicle-autonomy vision-systems technology. Multi-material body solutions: Possibilities and manufacturing challenges The body-in-white is a prime target for lightweighting and many automakers are pursuing unique and effective multi-material approaches, but improved design tools and processes might yield greater gains.
This ARP is intended to cover the warning, caution and advisory indicating system required for commercial and military aerospace vehicles. The purpose of this ARP is to recommend certain basic considerations which the design engineer should observe when designing a visual warning indicating system. It is recognized that many types of warning indicators and systems are available for the designer to use. This ARP does not recommend any specific system but outlines design and installation requirements.
The requirements presented in this document cover the design factors which might cause any part of an electrically motor driven fuel pump assembly to act as an ignition source for explosive fuel vapors within the airplane tank.
This SAE Aerospace Recommended Practice (ARP) applies to Point-Of-Use, Central and Mobile Pre-Conditioned Air Equipment. It does not apply to aircraft mounted equipment.
This specification is intended to be used as a general standard for industry use for design and construction of air transport galley equipment and inflight food service systems.
Base-engine value engineering for higher fuel efficiency and enhanced performance Continuous improvement in existing engines can be efficiently achieved with a value engineering approach. The integration of product development with value engineering ensures the achievement of specified targets in a systematic manner and within a defined timeframe. Integrated system engineering for valvetrain design and development of a high-speed diesel engine The lead time for engine development has reduced significantly with the advent of advanced simulation techniques. Cars poised to become 'a thing' Making automobiles part of the Internet of Things brings both risks and rewards. Agility training for cars Chassis component suppliers refine vehicle dynamics at the high end and entry level with four-wheel steering and adaptive damping.
Increasingly stringent anti-idling laws continue to exert pressure on the off-highway industry to minimize the release of CO2 emissions and diesel particulate matter into the environment, notes Webasto's Don Kanneth.
This SAE Aerospace Recommended Practice (ARP) documents a common understanding of terms, compliance issues, and occupant injury criteria to facilitate the design and certification of oblique facing passenger seat installations specific to Part 25 aircraft. The applicability of the criteria listed in this current release is limited to seats with an occupant facing direction greater than 18 and no greater than 30 degrees relative to the aircraft longitudinal axis. Later revisions are intended to provide criteria for other facing directions. Performance criteria for side facing seats installed with the occupant facing direction at 90 degrees relative to the aircraft longitudinal axis are provided in AS8049/1. Seats installed at angles greater than 30 degrees relative to the aircraft longitudinal axis must have an energy absorbing rest or shoulder harness. However, this document does not provide the criteria for oblique facing seats incorporating such rests.
OEMs can satisfy both increasing emissions requirements and keeping up with new product innovations by focusing their attention on the areas of the equipment that impact the operator experience on a larger scale, says Southco's Bob Straka.
National Renewal Energy Laboratory tests use of insulation and other techniques to reduce A/C cooling and heating loads by more than 30%. Savings for cooling alone estimated at 774 gal/yr of diesel fuel compared with overnight idling.
This document surveys the systems used for thermal management of batteries in vehicles. Battery thermal management is important for battery performance and cycle life. The document also includes a summary of design considerations for battery thermal management and a glossary of terms.
This specification covers the requirements for a light assembly for use on aircraft cabin desks.
SCOPE IS UNAVAILABLE.
This SAE Recommended Practice establishes guidelines for the operation of automotive keyless ignition systems with the goal of helping to minimize user instigated errors. For the purpose of this Recommended Practice, user instigated errors may include: • the inability to start and stop the vehicle propulsion system, • exiting the vehicle with the automatic transmission in a non-parking gear, • exiting the vehicle while the vehicle propulsion system is enabled, • exiting the vehicle while the vehicle propulsion system is disabled, but the accessory or electrical systems are active. To help minimize these errors, this Recommended Practice contains design recommendations pertaining to uniform labeling, operating logic, indication of vehicle ignition/control status, and physical control characteristics of keyless ignition systems. This Recommended Practice applies to keyless ignition controls permanently mounted in passenger cars, MPVs, and trucks 10 000 GVWR and under.
New dawn at Honda R&D President Yoshiyuki Matsumoto aims to invigorate Honda's technology and product-development organization with 'full soul.' Automated driving meets regulation: NHTSA and the next 50 years The challenges and opportunities on the road to 'zero deaths' demand a new level of federal automotive safety technical standards, and a new safety-defect reporting and recall system. NHTSA and the U.S. Congress must act boldly and quickly to make it happen. Autonomous driving meets regulation: Hands off, eyes off, brain off Euro NCAP'S president warns that without coherent policies, the growing availability of automated technologies may result in piecemeal technology development-and unintentional consequences. Designer yin meets engineer yang Efficient and effective vehicle development means even closer collaboration between the two former sparring partners.
UAV Technology Using SWaP-C Reductions to Improve UAS/UGV Mission Capabilities UGV Technology Designing Rugged Computing Platforms for UGVs UUV & Robotics Technology Bi-manual Dexterous Manipulation for Maritime Explosive Ordnance Disposal UUV Technology Applying UUV Advances to Safeguard Harbors and Littoral Waters Robotics Technology Designing a Robot to Counter Vehicle-Borne Improvised Explosive Devices
A Linear Parameter Varying Combined with Divide-and-Conquer Approach to Thermal System Modeling of Battery Modules
Abstract A linear parameter varying (LPV) reduced order model (ROM) is used to approximate the volume-averaged temperature of battery cells in one of the modules of the battery pack with varying mass flow rate of cooling fluid using uniform heat source as inputs. The ROM runs orders of magnitude faster than the original CFD model. To reduce the time it takes to generate training data, used in building LPV ROM, a divide-and-conquer approach is introduced. This is done by dividing the battery module into a series of mid-cell and end-cell units. A mid-cell unit is composed of a cooling channel sandwiched in between two half -cells. A half-cell has half as much heat capacity as a full-cell. An end-cell unit is composed of a cooling channel sandwiched in between full-cell and a half-cell. A mass flow rate distribution look-up-table is generated from a set of steady-state simulations obtained by running the full CFD model at different inlet manifold mass flow rate samples.
A maker of expansion valves has demonstrated a significant reduction in A/C compressor workload, benefiting vehicle energy use, by going electronic.
Honeywell has entered into a supply agreement and technology license with an Indian manufacturer to produce Honeywell Solstice yf, an automobile refrigerant with a global warming potential (GWP) of less than 1.
Consortium of OEMs and suppliers worked on all fronts, while the SAE Interior Climate Control Committee reopened a suite of draft standards to prepare for possible importation of cars with R-744: CO2 as a refrigerant.
Performance Standards for Side-Facing Seats in Civil Rotorcraft, Transport Aircraft, and General Aviation Aircraft
This SAE Aerospace Standard (AS) defines Minimum Performance Standards (MPS), qualification requirements, and minimum documentation requirements for side-facing seats in civil rotorcraft, transport aircraft, and general aviation aircraft. The goal is to achieve comfort, durability, and occupant protection under normal operational loads and to define test and evaluation criteria to demonstrate occupant protection when a side-facing seat/occupant/restraint system is subjected to statically applied ultimate loads and to dynamic test conditions set forth in Title 14, Code of Federal Regulations (CFR) Part 23, 25, 27, or 29. While this document addresses system performance, responsibility for the seating system is divided between the seat supplier and the installation applicant. The seat supplier’s responsibility consists of meeting all the seat system performance requirements and obtaining and supplying to the installation applicant all the data prescribed by this document.
Experts see a loss of motorist trust if cyber attacks are possible. Common command for automotive service is one example of dangers that must be addressed.
As Airbus looks to launch new-engine option (neo) aircraft, it has announced it is also launching a new cabin brand it calls “Airspace by Airbus.”
Software's role continues to expand Design teams use different technologies to create new software and link systems together. Emissions regulations and engine complexity With the European Commission announcing a Stage V criteria emissions regulation for off-highway, scheduled to phase-in as earlly as 2019, there will be an end to a brief era of harmonized new-vehicle regulations. Will this affect an already complex engine development process? Evaluating thermal design of construction vehicles CFD simulation is used to evaluate two critical areas that address challenging thermal issues: electronic control units and hot air recirculation.
Method to Evaluate Aircraft Passenger Seats for the Test Requirements of 14CFR part 25 Appendix F, Parts IV & V
This SAE Aerospace Recommended Practice (ARP) provides an approach for determining which parts on aircraft seats are non-traditional, large, non-metallic panels that need to meet the test requirements of 14CFR Part 25 Appendix F, Parts IV & V.