Truck noise IV-H: post-fleet test results on heavy duty diesel trucks having reduced noise emissions. Final report.

Transportation Department, Secretary of Transportation, Washington, D.C.

NHTSA's Heavy Duty Vehicle Brake Research Program - report no. 6: performance evaluation of a production antilock system installed on a two axle straight truck. Interim report.

Mode of access: Internet.

Data analysis of tractor-trailer drivers to access drivers' perception of heavy duty truck ride quality. Final report.

National Highway Traffic Safety Administration, Office of Driver and Pedestrian Research, Washington, D.C.

Truck noise XI. Evaluation and reduction of heavy-duty truck noise. Final report.

Transportation Department, Office of Noise Abatement, Washington, D.C.

Toxic gases in heavy duty diesel truck cabs. Final report.

Federal Highway Administration, Washington, D.C.

Noise and traction characteristics of bias-ply and radial tires for heavy duty trucks. Final report.

Transportation Department, Office of Noise Abatement, Washington, D.C.

Roll neck bearings; report of A. S. M. E. Special research committee on heavy-duty anti-friction bearings, 1935.

Photoprinted.

Heavy duty rescue course.

Its United States civil defense.

Organizational maintenance repair parts and special tools lists : grader, road, motorized, heavy duty, DED NSN 3805-00-155-7093, Huber Corporation model F1500MW and NSN 3805-01-064-3878, Huber Corporation model F1500M.

Includes indexes.

Direct support and general support maintenance manual : grader, road, motorized, heavy duty, DED, Huber Corporation models F1500M (3805-00-155-7093), F1500MW (3805-01-064-3878).

Includes index.

Operator and organizational maintenance manual : grader, road, motorized, heavy duty, DED Huber Corporation models F1500M (3805-00-155-7093), F1500MW (3805-01-064-3878).

Includes indexes.

Toxic gases in heavy duty diesel truck cabs /

Mode of access: Internet.

DYNAMIC MODEL BASED STATE ESTIMATION IN A HEAVY DUTY DIESEL AFTERTREATMENT SYSTEM FOR ONBOARD DIAGNOSTICS AND CONTROLS

Estimating un-measurable states is an important component for onboard diagnostics (OBD) and control strategy development in diesel exhaust aftertreatment systems. This research focuses on the development of an Extended Kalman Filter (EKF) based state estimator for two of the main components in a diesel engine aftertreatment system: the Diesel Oxidation Catalyst (DOC) and the Selective Catalytic Reduction (SCR) catalyst. One of the key areas of interest is the performance of these estimators when the catalyzed particulate filter (CPF) is being actively regenerated. In this study, model reduction techniques were developed and used to develop reduced order models from the 1D models used to simulate the DOC and SCR. As a result of order reduction, the number of states in the estimator is reduced from 12 to 1 per element for the DOC and 12 to 2 per element for the SCR. The reduced order models were simulated on the experimental data and compared to the high fidelity model and the experimental data. The results show that the effect of eliminating the heat transfer and mass transfer coefficients are not significant on the performance of the reduced order models. This is shown by an insignificant change in the kinetic parameters between the reduced order and 1D model for simulating the experimental data. An EKF based estimator to estimate the internal states of the DOC and SCR was developed. The DOC and SCR estimators were simulated on the experimental data to show that the estimator provides improved estimation of states compared to a reduced order model. The results showed that using the temperature measurement at the DOC outlet improved the estimates of the CO , NO , NO2 and HC concentrations from the DOC. The SCR estimator was used to evaluate the effect of NH3 and NOX sensors on state estimation quality. Three sensor combinations of NOX sensor only, NH3 sensor only and both NOX and NH3 sensors were evaluated. The NOX only configuration had the worst performance, the NH3 sensor only configuration was in the middle and both the NOX and NH3 sensor combination provided the best performance.

Risk assessment of liquid hydrogen tanks for heavy duty vehicles

The advent of the hydrogen economy has already been predicted but it does not represent a tangible reality yet. However, decarbonizing the global economy and particularly the energy sector is vital to limit global warming and reduce the incumbent environmental problems. Hydrogen is a promising zero-emission fuel that could replace traditional fossil fuels, playing a key role in the transition towards a more sustainable economy. At present, hydrogen-powered cars are already spread worldwide and the deployment of hydrogen buses seems to be the next goal in the decarbonization process of the transportation sector. In contrast with the undeniable benefits introduced by the use of this alternative fuel, given its hazardous properties, safety is a topic of high concern. The present study concerns the evaluation of the risks linked to the on board storage of hydrogen on hydrogen-powered buses in case of road accident. Currently, hydrogen can be stored on board as a high-pressure gas, as a cryogenic liquid or in cryo-compressed form. Those solutions are compared from a safety point of view. First, the final accidental scenarios that could follow the release of the fuel in case of a road crash are pointed out. Secondly, threshold values for the hazardous effects of each scenario are fixed and the corresponding damage distances are calculated thanks to the use of the software PHAST 8.4. Finally, indicators are quantified to compare the different options. Results are discussed to find out the safer solution and to evaluate whether the replacement of fossil fuels with hydrogen introduces new safety issues.

Development of high specific strength components, with internal cellular structure, for several applications

Dissertação de mestrado em Engenharia Mecânica