Refine Your Search




Search Results


SAE Vehicle Electrification: February 11, 2014

Inside the cell walls The high cost of lithium-ion batteries is a prison that has largely kept electric vehicles off the street; the keys to their release are more effective—but not more expensive—cell chemistries.

Minimum Performance Standard for a Cabin Occupant Personal Oxygen Dispensing Unit for use from 40,000 to 45,000 Feet

This Aerospace Standard (AS5727) will provide the basis for a certification approach and contain the methods or criteria for verification of performance required of Oxygen Dispensing Units for use by cabin occupants in the range of 40,000 to 45,000 ft. cabin altittude. 1.1 Purpose - This AS is intended to identify the performance required of Personal Oxygen Dispensing Units in the range of 40,000 to 45,000 ft.

Human Engineering Considerations with Implementation of Aided Flight Vision forVertical Flight Platforms All Weather Operations

Identify the phase of flights that can take benefit of Aided Visual Flight for the various missions of helicopters both VFR and IFR such as: Commercial Air Transport Operations offshore and onshore, EMS (Air ambulance), Law enforcement (Operations with Specific Approvals),Search and Rescue (SAR) operations both in Maritime and Mountainous operations The Aided Flight should be considered with various levels of on-boarded sensor technology and its performance such as, but not limited to: NVG, Addition of Axial IR Sensor (with minimum performance to define), Potential use of orientable search light (night VFR) and other situation awareness means like HTAWS, SVS, and sensor like Radio Altimeter including the display mean head-down or head worn that influence operational aspects.

Guidelines for Human Subject Testing

The aim of this document is to establish a standardized approach for Human Subject Testing considering varying performance requirements of different user groups on aircraft as Flight Crew, Cabin Crew and Passengers. The document will provide guidance for definition of significant topics relevant to equipment and system certification. The document will include information regarding ethical aspects, criteria to select human subjects for testing, safety of test subjects, requirements to medical personnel to attend tests and in particular if humans are exposed to elevated altitudes. Recommendation will be provided regarding test result monitoring and data validity

Vehicle Aerodynamics, 2018

Vehicle aerodynamic development, drag reduction and fuel economy, handling and stability, cooling flows, surface soiling and water management, vehicle internal environment, tyre aerodynamics and modelling, aeroacoustics, structural response to aerodynamic loading, simulating the on-road environment, onset flow turbulence, unsteady aerodynamics, fundamental flow structures, new test methods and facilities, new applications of computational fluid dynamics simulation, competition vehicle aerodynamics.

Quick Connect Fluid Coupling Specification for Water/Glycol Coolant System Interconnect

This SAE Recommended Practice defines the dimensional characteristics and minimum performance requirements for quick connect couplings between flexible tubing or hose and rigid tubing or tubular fittings used in glycol/water coolant systems. This document applies to automotive and truck applications under the following conditions: a. Gasoline, diesel, hybrid, and electrical propulsion cooling systems. b. Operating pressure up to 206 kPa, 2.06 bar, (30 psig). c. Operating temperatures from -40 °C (-40 °F) to 125 °C (260 °F). Quick connect couplings function by joining the connector to a mating end form typically without the use of tools. The requirements stated in this document apply to new connectors in assembly operations unless otherwise indicated.

SAE Demo Day in Tampa - Highlights

In May 2018, SAE International in partnership with THEA and leading AV technology companies gave citizens in Tampa a chance to test ride the future. The event included a pre- and post-ride survey, a ride in an automated vehicle, interactive displays and engagement with industry experts. See highlights of the event and feedback from participants.

Oxygen Considerations for High Elevation Airport Operations (HEAO)

The scope of this document is to provide helpful information concerning the use of oxygen when flying into and out of high elevation airports. Normally for aircraft operations that fly at high altitude, oxygen requirements involving a decompression are generally easy to understand and follow because of the increased delta between cabin and ambient pressures. This document is intended to address a transition zone case where cabin and ambient pressures are closely the same and oxygen usage can be compounded by physiologic subjectivity that often may be accompanied by hypoxia. Operators who fly into these high altitude airports will be required to address in their operational manual the inherent issues associated with this transition zone. This document will provide adequate information to aid operators in checking that their procedures will best fit their safety needs with regards to hypoxia and ensure compliance with regulations.
Technical Paper

Application of Shape Memory Heat Engines to Improving Vehicle Fuel Economy

Shape memory materials undergo temperature-induced martensitic phase transformations that involve reversible dimensional changes. In performing these changes in shape, the shape-memory material is able to do work against external constraints, and this is the basis for shape-memory low-temperature heat engines. The transformation temperatures on heating and cooling are often not very different (little hysteresis) and are well defined and reproducible. Furthermore, these temperatures can be adjusted by varying the composition of the shape memory alloy. Internal combustion engines dissipate approximately two-thirds of the fuel energy as heat to the exhaust and coolant systems. A low-temperature heat engine could convert a fraction of this heat energy to useful work. This paper discusses the conceptual basis for the application of shape memory heat engines to internal combustion engine powered vehicles. Metallurgical and thermodynamic factors are discussed, as well as engine efficiency.
Technical Paper

Simulors, An Innovative Tool for Molds Development

Mold designers and foundrymen spend a lot of time in developing molds without knowing exactly the phenomena which take place inside. Simulor, which has been used in an industrial environment for two years, offers the solution to make foundrymen understand what happens during the filling of the mold and the solidification of the part. Based on navier-stokes and heat transfer equations, simulor provides speed distribution and metal front evolution in the cavity and thermal map in the mold and the part. Some examples with different metals (cast iron, aluminum alloy) cast with various processes (sand or die casting, low pressure or gravity casting) will be given. This new tool will given foundrymen the opportunity to test the mold before having it machined and will also allow reduction in development delays.
Technical Paper

Factors Influencing Petrol Consumption as Determined from a Survey of the Australian Passenger Car Fleet

A survey of the on-road petrol consumption of Australian passenger cars provided data which has been analysed for effects on fuel consumption caused by features such as transmission type, vehicle inertia class, engine size, air conditioning presence and vehicle location. Results show that cars with automatic transmissions consistently have higher petrol consumption than manuals for all inertia classes - 15% higher in city conditions and 11% higher in highway conditions. There is also a penalty for automatic transmissions at most engine sizes, although the penalty is relatively larger for smaller engine capacities. Presence of air conditioning was found to increase petrol consumption by 13.5% on average, but the data did not allow the impact of frequency of use to be determined. Coastal driving conditions resulted in petrol consumption being 9.4% higher than for inland conditions, and cars driven in winter had 4.4% greater fuel consumption than cars driven in summer.
Technical Paper

Guidelines on the Use of Experimental Sea for Modeling and Understanding Road Noise in Cars

Over the last years, SEA has been recognized as a useful tool to model and analyze the high-frequency vibro-acoustic behavior of fully assembled complex structures. This paper discusses the experimental derivation of the loss factor model of a passenger car. The paper outlines the different steps which need to be taken to obtained a fully validated experimental SEA model. This includes the subdivision into subsystems, the PIM measurement campaign, the derivation of the loss factors and their associated confidence levels and the model validation. The paper further details how the experimental SEA model was used to quantify and investigate the airborne and structure-borne contributions to the interior noise level for a road noise test condition. The operational power inputs to the vehicle were indirectly determined from operational response measurements. A contribution analysis showed that airborne noise sources dominated structure-borne noise sources above 500Hz.
Technical Paper

Analysis of Vehicle Pillar Cavity Foam Block Effect on Interior Noise Using SEA

Closed cell foam has been used for filling vehicle pillar cavities at select locations to block road noise transmitted through pillars. In the past, most pillar foam implementations in vehicle programs were driven by subjective improvements in interior sound. In this study road test results are used to correlate a detailed CAE (Computer-Aided Engineering) model based on the statistical energy analysis method. Noise reduction characteristics of pillar with a number of foam block fillings were then studied using the CAE model. The CAE models provided means to model and understand the mechanism of noise energy flow through pillar cavities. A number of insightful conclusions were obtained as result of the study.
Technical Paper

Evaluating Vehicle Interior Noise Quality Under Transient Driving Conditions

This paper presents a software-driven procedure for continuous assessment facilitating an evaluation of non-stationary sound quality. The noise stimuli are presented to the test persons via headphones and a subwoofer from a personal computer. The key feature of the rating procedure is the “zonal pairwise comparison” for the time zones at the beginning and the end of the noise sequences. Evaluation of data together with time variant objective parameters by means of statistical methods is described. The results and models from multiple regession analysis are given.
Technical Paper

Input Loading for Squeak & Rattle CAE Analysis

A method to create a CAE load by utilizing the vibration motions at structure attachments has been developed. This method employs the concept of enforced motion as the constraints of boundary conditions to create an equivalent input force/moment matrix for a sub-structure with multi-point attachments. The main assumption is that motions at the attachments of the sub-structure should be the same as the known motions of the main structure under the generated input load. The key concept of the developed methodology is the calculation of the input dynamic compliance matrix for sub-structure attachment locations. This method is developed to create a system level input load to be used for squeak and rattle CAE analysis on a component or sub-system. It can also be used for minor component design change evaluation using only the component CAE model, yet as if it is assembled in the vehicle.
Technical Paper

Developing Robust Vibration Excitation and Control Methods for Evaluating Rattle Noise in Automotive Components

The authors participated in a task force that was required to develop a repeatable, dependable, and reliable test procedure to compare, rate, and evaluate the severity of rattles. The assemblies involved in the study are designed and manufactured by different companies and are tested by different people on test equipment and instrumentation from different suppliers. The challenges therefore, were considerable and involved both the vibration inputs and responses as well as the acoustic responses. At the beginning of this activity, it was observed that different test labs using the same Ford vibration specs were obtaining different sounds from the same test item! Clearly, this was unacceptable and the test methods had to be improved and standardized. This paper focuses on vibration related to rattle testing. The particular assemblies used in this study were seat belt retractors.
Technical Paper

The Effects of Retained Fluid and Humidity on the Evacuation of Critical Vehicle Systems

In automotive assembly facilities worldwide, many critical vehicle systems such as brakes, power steering, radiator, and air conditioning require the appropriate fluid to function. In order to insure that these critical vehicle systems receive the correct amount of properly treated fluid, automotive manufacturers employ a method called Evacuation and Fill. Due to their closed-loop design, many critical vehicle systems must be first exposed to vacuum prior to being flooded with fluid. Only after the evacuation and fill process is complete will the critical vehicle system be able to perform as specified. It has long been thought, but never proven, that humidity and entrenched fluid were major hindrances to the Evacuation and Fill process. Consequently, Ford Motor Company Advanced Manufacturing Technology Development, Sandalwood Enterprises, Kettering University, and Dominion Tool & Die conducted a detailed project on this subject.