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Viewing 1 to 30 of 403
2017-06-05
Technical Paper
2017-01-1775
Mark A. Gehringer, Robert Considine, David Schankin
This paper describes recently developed test methods and instrumentation to address the specific noise and vibration measurement challenges posed by large diameter single-piece tubular aluminum propeller shafts with high modal density. The application described in this paper is a light duty truck, although the methods described are applicable to any rotating shaft with similar dynamic properties. To provide a practical example of the newly developed methods and instrumentation, rotating and non-rotating data were acquired in-situ for several propeller shafts of varying construction, including both lined and unlined shafts. Data were also acquired with and without a torsional tuned vibration absorber attached to the driveline. The example data exhibit features that are uniquely characteristic of large diameter single-piece tubular shafts with high modal density, including the particular effect of shaft rotation on the measurements.
2017-06-05
Technical Paper
2017-01-1893
Douglas Moore
This paper will examine the regulatory development process, discuss the technical principles of the Economic Commission for Europe (ECE), ECE R51.03 test, and discuss the overall objectives of the ECE R51.03 noise emission regulation. The development of this global noise emission regulation was a multi-stakeholder process which has resulted in new test procedures and new noise emission regulation principles. New test procedures based on ISO 362-1:2015 move the test basis to representative in-use noise emission, independent of vehicle propulsion technology. As part of the regulatory development, a monitoring program was conducted by the European Union to assess the applicability of the proposed test to provide representative vehicle noise emission results. The monitoring results also provided the basis to determine equivalent stringency between the test procedures of ECE R51.02 and R51.03.
2017-06-05
Technical Paper
2017-01-1823
Dennis J. Kinchen
Powertrain mounting systems design and development involves creating and optimizing a solution using specific mount rates and multiple operating conditions. These mount rates become the recommended “nominal” rates in the specifications. As is typical of natural materials, the properties have variation resulting in a tolerance around the nominal specification which leads to differences in noise and vibration performance. A system that is robust to this variation is desired. The design and development process requires evaluation of these mounts to ensure that the noise and vibration performance is consistently met. During the hardware development of the powertrain mounting system a library of mounts that include the range of production variation is studied however this is time consuming. In this paper, a methodology is described to reduce the hardware evaluation time and provide a recommended optimal solution that is robust in the presence of production mount property variation.
2017-06-05
Journal Article
2017-01-1770
Wallace Hill, Dennis Kinchen, Mark A. Gehringer
This paper describes a method used to assess and optimize half shaft joint angles to avoid excessive 3rd order vibrations during WOT and light drive away events. The objective was to develop a test based analytical model used to assess and optimize driveline-working angles during the early planning phases of a new program when packaging tradeoffs are decided. The 12 degree of freedom system model comprehends half shaft dynamic angle change, axle torque, P/T mount rate progression and axial forces in the tripot joints. The analytical model results enable fact-based decisions during architectural planning phases for driveline working angles, powertrain mount designs and locations relative to P/T center of gravity. There were several challenges encountered and addressed during the correlation process including half shaft dynamic angle, P/T lateral rigid body mode frequency and subjective rating predictions.
2017-03-28
Technical Paper
2017-01-1112
Jian yao, Li Chen, Ding Zhao Jr, Chunhao Lee, Ying Huang, Yin Chengliang
Abstract The wedge clutch takes advantages of small actuation force/torque, space-saving and energy-saving. However, big challenge arises from the varying self-reinforced ratio due to the varying friction coefficient inevitably affected by temperature and wear. In order to improve the smoothness and synchronization time of the slipping process of the wedge clutch, this paper proposes a self-tuning PID controller based on Lyapunov principle. A new Lyapunov function is developed for the wedge clutch system. Simulation results show that the self-tuning PID obtains much less error than the conventional PID with fixed gains. Moreover, the self-tuning PID is more adaptable to the variation of the friction coefficient for the error is about 1/5 of the conventional PID.
2017-03-28
Journal Article
2017-01-0801
Keith Vertin, Brent Schuchmann, William Studzinski, Richard S. Davis, Thomas G. Leone, James E. Anderson, Asim Iqbal
Abstract Automakers are designing smaller displacement engines with higher power densities to improve vehicle fuel economy, while continuing to meet customer expectations for power and drivability. The specific power produced by the spark-ignited engine is constrained by knock and fuel octane. Whereas the lowest octane rating is 87 AKI (antiknock index) for regular gasoline at most service stations throughout the U.S., 85 AKI fuel is widely available at higher altitudes especially in the mountain west states. The objective of this study was to explore the effect of gasoline octane rating on the net power produced by modern light duty vehicles at high altitude (1660 m elevation). A chassis dynamometer test procedure was developed to measure absorbed wheel power at transient and stabilized full power operation. Five vehicles were tested using 85 and 87 AKI fuels.
2017-03-28
Journal Article
2017-01-1623
Tim Felke, Steven Holland, Sachin Raviram
Abstract Suppliers and integrators are working with SAE’s HM-1 standards team to develop a mechanism to allow “Health Ready Components” to be integrated into larger systems to enable broader IVHM functionality (reference SAE JA6268). This paper will discuss how the design data provided by the supplier of a component/subsystem can be integrated into a vehicle reference model with emphasis on how each aspect of the model is transmitted to minimize ambiguity. The intent is to enhance support for the analytics, diagnostics and prognostics for the embedded component. In addition, we describe functionality being delegated to other system components and that provided by the supplier via syndicated web services. As a specific example, the paper will describe the JA6268 data submittal for a typical automotive turbocharger and other engine air system components to clarify the data modeling and integration processes.
2017-03-21
Article
Steady technology development and committed infrastructure investment combine to bring fuel-cell vehicles (FCVs) to the brink of mainstream applicability.
2017-02-14
Article
The high cost of developing new technologies such as fuel cells is making partners out of competitors.
2017-01-30
Article
After three years of co-developing a new-generation fuel cell stack aimed at light vehicles, military, aerospace and other applications, Honda and GM have announced the establishment of Fuel Cell System Manufacturing LLC—the industry’s first joint venture for fuel-cell production.
2017-01-10
Technical Paper
2017-26-0108
MM Hashim
Abstract Interior permanent magnet machines are being widely used in hybrid vehicles owing to their compact size and high power density. Vehicle level application requires the motor to operate at high speed beyond the base speed of the motor. This is accomplished through flux weakening control. Nonfunctioning of inverter switches and/or gate driver circuit during flux weakening could give rise to a potential fault scenario called Un-Controlled Generation (UCG). This paper gives a detailed background of UCG and its impact on the high voltage and propulsion systems. In further sections the details related to modelling and analysis of UCG will be discussed. Finally, the paper will conclude with simulation results and comparison of the results with motor dynamometer test data.
2016-12-01
Article
Delphi rolls out its next-gen automated-driving technology platform, called CSLP, due for production by 2019.
2016-11-29
Article
While Donald Trump was blasting China for allegedly taking U.S. jobs, GM was quietly importing new China-made vehicles into the U.S.
2016-11-15
Article
At least for this moment, all is right with the world as Mercedes-Benz reinstates a new-age version of its iconic inline six-cylinder engine.
2016-11-07
Article
The Administration recently announced details of the expanded network of EV charging stations across nearly 25,000 mi (40,233 km) of highways in 35 U.S. states and the District of Columbia.
2016-10-25
Technical Paper
2016-36-0360
Lucas Pintol Nishikawa, André Caetano Melado, Hélio Goldenstein, Luiz Felipe Bauri, Dinecio dos Santos Filho, Eduardo Nunes
Abstract The Austempering heat treatment is a well-known solution to improve the mechanical properties of ductile cast irons, therefore being referred as 'ADI' (Austempered Ductile Iron). The improved mechanical properties of ADI's with respect to conventional ductile iron is attributed to its resulting microstructure, which contains mainly carbide-free bainite with stabilized retained austenite. More recently, ductile cast irons were submitted to another heat treatment, known as 'Quenching and Partitioning' (Q&P). In this case, the ductile cast iron is austenitized, quenched to a temperature between Mf and Ms temperatures and subsequently heated to a temperature above Ms in order to partition the carbon from the martensite to the remaining austenite. The resulting microstructure comprises mainly low carbon martensite, austenite (stabilized by the carbon partition) and carbide-free bainite. Such microstructure resulted in equal or better properties than ADI.
2016-10-24
Article
The key to engineering greatness is the willingness to take intelligent risks—both reputational and risks with the product, says one of the industry's greatest "product guys."
2016-09-22
Article
GM has taken a lesson from Tesla's Autopilot driver engagement problems and its new Super Cruise driving system will be different.
2016-09-16
Article
Advanced tire-simulation modeling allows tire development to keep pace with accelerated vehicle development cycles.
2016-08-01
Article
For 2016, the fourth year of its annual Enlighten Awards that acknowledge the best innovations in vehicle weight reduction, Altair named GM’s 2016 Cadillac CT6 as the winner in the Full-Vehicle category and ContiTech’s polyamide rear-axle transmission crossbeam is the winner in the Enlighten Awards’ Module category.
2016-07-17
Article
In concert with partner AK Steel, NanoSteel has finally brought its new sheet steel to the production threshold as the industry gobbles high-strength, lighter weight alloys at an increasing rate.
2016-06-30
Article
Vehicle-to-vehicle, or V2V communication could be the biggest safety boon since seatbelts.
2016-06-21
Article
Disruption is one thing, but another Tesla controversy helps explain why many tech companies know better than to try to take over the auto business.
2016-06-14
Article
BWI Group believes its second-generation Magneto Rheological (MR) powertrain mount helps meet downsized-powertrain NVH challenges.
2016-05-25
Article
The auto industry's crusade to reduce vehicle weight is creating clever new manufacturing techniques.
2016-05-19
Article
General Motors intends to transform materials-joining technology with a new multi-patented process for spot-welding steel to aluminum
2016-05-15
Article
With the first-generation Honda Ridgeline, buyers weren't ready for a unibody pickup with odd styling. For the 2017 model, the design is normal—and unibody refinement might be a concept whose time has come.
2016-04-12
Article
Nautilus Engineering: novel new engine design solves longstanding HCCI engine-development hurdles.
2016-04-11
Article
Automakers are increasingly employing digital crash test dummies made of zeroes and ones to take the big hits in virtual vehicles.
2016-04-05
Technical Paper
2016-01-0463
Juan Sierra, Camilo Cruz, Luis Munoz, Santiago Avila, Elkin Espitia, Jaime Rodriguez
Abstract Brake systems are strongly related with safety of vehicles. Therefore a reliable design of the brake system is critical as vehicles operate in a wide range of environmental conditions, fulfilling different security requirements. Particularly, countries with mountainous geography expose vehicles to aggressive variations in altitude and road grade. These variations affect the performance of the brake system. In order to study how these changes affect the brake system, two approaches were considered. The first approach was centered on the development of an analytical model for the longitudinal dynamics of the vehicle during braking maneuvers. This model was developed at system-level, considering the whole vehicle. This allowed the understanding of the relation between the braking force and the altitude and road grade, for different fixed deceleration requirement scenarios. The second approach was focused on the characterization of the vacuum servo operation.
Viewing 1 to 30 of 403

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