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Viewing 1 to 30 of 4162
2017-09-04
Technical Paper
2017-24-0158
Teresa Castiglione, Giuseppe Franzè, Angelo Algieri, Pietropaolo Morrone, Sergio Bova
The paper shows how specific requirements of the cooling system of an ICE can be met by actuating the coolant flow rate independently of engine speed, by means of an electric pump and of an ad-hoc developed control system. Given that the proposed methodology is valid for each condition, in the present paper the focus is on the engine operating under fully warmed conditions, with the aim to keep the wall temperature into the prescribed limits, with the lowest possible coolant flow rates. This goal is achieved by properly defining the controller parameters. The developed controller is based on the Robust Model Predictive Control approach, which makes use of a lumped parameter model of the engine cooling system. The model also includes the radiator-thermostatic valve-fan block and incorporates the nucleate boiling heat transfer regime.
2017-09-04
Technical Paper
2017-24-0160
Mario Marchetti, Riccardo Russo, Salvatore Strano, Mario Terzo
Magnetorheological fluids (MRFs) appear particularly functional for automatic clutch applications due to their capability of rapidly increasing their shear strength when subjected to a magnetic field, and being a viscous fluids when the magnetic field is turned off. They have been investigated since the late 1940s and are employed in different operating modes: in particular, the shear mode is adopted in clutches and brakes. In addition to the controllable property, they have the advantage, with respect to conventional clutches, of not requiring axial loading and the absence of wear. The activity described in this paper has been carried out in the framework of a funded project aimed at evaluating the feasibility of a controllable water pump based on an integrated MRF clutch.
2017-07-10
Technical Paper
2017-28-1951
K Nantha Gopal, B. Ashok, Rishabh Bahuguna, Tanmay Prasad
Abstract Thermal management is one of the most challenging and innovative aspects of the automotive industry. The efficiency of the vehicle cooling framework unequivocally relies upon the air stream through the radiator core. Significant advances in thermal management are being embraced in the field of radiator material and coolant. The radiator shouldn't be exclusively credited for the reliable cooling of the engine. There are other auto parts that play an essential role in keeping engine temperature at a manageable level. The fan-shroud assembly is an important component of the cooling system. While the fan is responsible for drawing in air, the fan shroud's job is to ensure uniform air distribution to the radiator core. By assisting airflow in the engine compartment the fan shroud helps in dismissing excess heat from the engine. This assembly also prevents the recirculation of heated air through the cooling fan.
CURRENT
2017-06-26
Standard
J1342_201706
The techniques outlined in this SAE Recommended Practice were developed as part of an overall program for determining and evaluating fuel consumption of heavy-duty trucks and buses, but it is applicable to off highway vehicles as well. It is recommended that the specific operating conditions be carefully reviewed on the basis of actual installation data. Cooling requirements are affected by all heat exchangers that are cooled by the fan drive system. These may include radiators, condensers, charge air coolers, oil coolers, and others. Because of the variation in size, shape, configuration, and mountings available in cooling fans and fan drive systems, specific test devices have not been included. Using known power/speed relationships for a given fan, this procedure can be used to calculate the fan drive system’s power consumption for engine cooling systems using fixed ratio, viscous or speed modulating, and mechanical on/off fan drives including electronically activated fan drives.
2017-06-21
WIP Standard
AS5188C
SCOPE IS UNAVAILABLE.
CURRENT
2017-06-19
Standard
AS7112/4A
This document has been declared "CANCELLED" as of June 2017 and has been superseded by PRI AC7112/4. By this action, this document will remain listed in the Numerical Section of the Aerospace Standards Index noting that it is superseded by PRI AC7112/4. Cancelled specifications are available from SAE.
CURRENT
2017-06-08
Standard
AS7112/1A
This document has been declared "CANCELLED" as of June 2017 and has been superseded by PRI AC7112/1. By this action, this document will remain listed in the Numerical Section of the Aerospace Standards Index noting that it is superseded by PRI AC7112/1. Cancelled specifications are available from SAE.
CURRENT
2017-06-08
Standard
AS7112A
This document has been declared "CANCELLED" as of June 2017 and has been superseded by PRI AC7112. By this action, this document will remain listed in the Numerical Section of the Aerospace Standards Index noting that it is superseded by PRI AC7112. Cancelled specifications are available from SAE.
2017-06-05
Technical Paper
2017-01-1787
Jan Biermann, Adrien Mann, Barbara Neuhierl, Min-Suk Kim
Abstract Over the past decades, interior noise from wind noise or engine noise have been significantly reduced by leveraging improvements of both the overall vehicle design and of sound package. Consequently, noise sources originating from HVAC systems (Heat Ventilation and Air Conditioning), fans or exhaust systems are becoming more relevant for perceived quality and passenger comfort. This study focuses on HVAC systems and discusses a Flow-Induced Noise Detection Contributions (FIND Contributions) numerical method enabling the identification of the flow-induced noise sources inside and around HVAC systems. This methodology is based on the post-processing of unsteady flow results obtained using Lattice Boltzmann based Method (LBM) Computational Fluid Dynamics (CFD) simulations combined with LBM-simulated Acoustic Transfer Functions (ATF) between the position of the sources inside the system and the passenger’s ears.
2017-06-05
Technical Paper
2017-01-1834
Dirk von Werne, Prasanna Chaduvula, Patrick Stahl, Michael Jordan, Jamison Huber, Korcan Kucukcoskun, Mircea Niculescu
Abstract Fan noise can form a significant part of the vehicle noise signature and needs hence to be optimized in view of exterior noise and operator exposure. Putting together unsteady CFD simulation with acoustic FEM modeling, tonal and broadband fan noise can be accurately predicted, accounting for the sound propagation through engine compartment and vehicle frame structure. This paper focuses on method development and validation in view of the practical vehicle design process. In a step by-step approach, the model has been validated against a dedicated test-set-up, so that good accuracy of operational fan noise prediction could be achieved. Main focus was on the acoustic transfer through the engine compartment. The equivalent acoustic transfer through radiators/heat exchangers is modeled based on separate detailed acoustic models. The updating process revealed the sensitivity of various components in the engine compartment.
2017-06-01
WIP Standard
AS1424H
This SAE Aerospace Standard (AS) covers medium-pressure, high-temperature, flexible, metal-hose assemblies suitable for operation in pneumatic systems up to 800 °F with excursion to 1200 °F for Class “B” and “N” and primarily for use on jet aircraft power plants. Refer to 1.2.1 for recommended usage. 1.1 Types a. Type 1: Convoluted helical inner tube, seamless or welded and redrawn tube material. b. Type 2: Convoluted annular inner tube, seamless or welded and redrawn tube material. c. Type 3: Convoluted helical inner tube, as-welded tube material. d. Type 4: Convoluted annular inner tube, as-welded tube material. NOTE: Unless otherwise specified on a design activity controlled drawing, or contract, Type 1, Type 2, Type 3, or Type 4 inner tube construction may be supplied. 1.2 Classes Hose assemblies furnished under this document may be of the following classes. If no class is defined the class “S” shall be utilized. a.
CURRENT
2017-06-01
Standard
J1390_201706
Three levels of fan structural analysis are included in this practice: a. Initial Structural Integrity b. In-vehicle Testing c. Durability (Laboratory) Test Methods The Initial Structural Integrity section describes analytical and test methods used to predict potential resonance and, therefore, possible fatigue accumulation. The In-vehicle (or machine) section enumerates the general procedure used to conduct a fan strain gage test. Various considerations that may affect the outcome of strain gage data have been described for the user of this procedure to adapt/discard depending on the particular application. The Durability Test Methods section describes the detailed test procedures for a laboratory environment that may be used depending on type of fan, equipment availability, and end objective. The second and third levels build upon information derived from the previous level.
CURRENT
2017-05-30
Standard
J512_201705
This SAE Standard covers complete general and dimensional specifications for the various types of tube fittings intended for general application in the automotive, appliance, and allied fields. See SAE J1131 for the performance requirements of reusable (push to connect) fittings intended for use in automotive air brake systems.
CURRENT
2017-05-19
Standard
AIR1168/10A
This AIR is arranged in the following two sections: 2E - Thermodynamic Characteristics of Working Fluids, which contains thermodynamic diagrams for a number of working fluids currently in use and supplied by various industrial firms. 2F - Properties of Heat Transfer Fluids, which contains data, primarily in graphical form, on fluids that are frequently used in fluid heat transfer loops. Other properties of the environment, gases, liquids, and solids, can be found, as follows, in AIR1168/9: 2A-Properties of the Natural Environment 2B-Properties of Gases 2C-Properties of Liquids 2D-Properties of Solids
CURRENT
2017-05-02
Standard
AS5356B
This specification covers flexible couplings for joining tubing with AS5131 Type A beaded ends for use in aircraft fuel and vent system (see 6.1).
CURRENT
2017-05-02
Standard
AS5188B
SCOPE IS UNAVAILABLE.
2017-04-21
WIP Standard
AS155H
Add integral silicone cuff max length and OD to flared parts standards
Viewing 1 to 30 of 4162

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