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Standard

Recommended Practices for Hydraulic Hose Assemblies

2020-11-17
WIP
J1273
SAE J1273 provides guidelines for selection, routing, fabrication, installation, replacement, maintenance, and storage of hose and hose assemblies for hydraulic fluid-power systems. Many of these SAE Recommended Practices also may be suitable for other hoses and systems.
Standard

Qualified Hoses for Marine Applications

2020-11-09
WIP
J1942/1
The following list consists of hose data provided as of December, 2019, and is for convenience in determining acceptability of nonmetallic flexible hose assemblies intended for usage under 46 CFR 56.60-25. Where the maximum allowable working pressure (MAWP) or type of fitting is not specified, use the manufacturer's recommended MAWP or type of fitting. This list has been compiled by SAE staff from information provided by the manufacturers whose product listings appear in this document. Manufacturers wishing to list their products in this document shall: a. Successfully test their hose to the requirements of SAE J1942, Table 1. b. Submit a letter of certification to the SAE J1942 test requirements for each specific type of hose tested (see sample table, Table 1) along with the test results. All sizes should be included in the same letter which must also include all of the information necessary to make a SAE J1942-1 listing. c.
Video

Development of a Cyclic Vehicle Heat Pump Frosting and Defrosting Operation Strategy

2020-11-03
Heat pumps are used in BEV for energy-efficient heating and to increase range in winter. At low temperatures, frost forms on the exterior heat exchanger surface, which leads to a decline in the system efficiency. The heat capacity is no longer able to be covered by the heat pump and the heat exchanger has to be defrosted. Subsequently, the heat pump operation can start again, which is referred as cyclic frosting / defrosting. Up to now, heat exchanger frosting is prevented in vehicle heat pumps series production by limiting the suction pressure of the heat pump depending on the dew point of the air. A cyclic frosting / defrosting strategy offers a large potential for a more energy-efficient heating and higher winter range. The presentation provides an overview of the three-year research project �cyclic frosting / defrosting of vehicle heat pumps�. In the beginning, the frosting behavior of different micro port extruded tube heat exchanger geometries and coatings is evaluated.
Video

Use of Partial Recirculation to Limit Build-Up of Cabin Carbon Dioxide Concentrations to Safe Limits per ASHRAE Standard-62

2020-11-03
Carbon dioxide exhaled by occupants remains within the cabin during operation of HVAC unit in recirculation mode. The CO2 inhaled by the occupants goes into their blood stream that negatively affects occupant�s health. ASHRAE Standard-62 (1999) specifies the safe levels of carbon dioxide in conditioned space for humans. The CO2 concentration limit per ASHRAE is 700 ppm over ambient conditions on a continuous basis. Based on the test data, at worst case scenario (idle condition where body leakage will be a minimal) results in CO2 concentrations of 1601, 2846, 4845 and 6587 ppm respective for 1 to 4 occupants in 30 minutes. Author has also conducted test by imposing ASHRAE standard-62. A controller was programmed for operating the blower unit�s intake door to go from recirculation to OSA mode when the measured carbon dioxide ppm level goes above 1100 ppm. The door stays in OSA mode until the cabin carbon dioxide falls to approximately 500ppm.
Video

�Omega� fin design for enhanced cooling capability on IGBTs

2020-11-02
Vehicle electrification is a rapidly growing and developing technology. As with any new technology there are hurdles that must be overcome as development marches forward. Overcoming these obstacles will require new and innovative solutions. One area of electrification that is quickly developing is the ability to convert voltage from AC to DC and from DC to AC. This is important since the battery pack outputs a DC voltage which must be converted to AC to drive the electric motor. The reverse is true when braking, the AC voltage generated by the electric motor is converted to DC in order to charge the battery. The conversion of voltage back and forth is controlled through the use of an inverter. The inverter uses Insulated-Gate Bipolar Transistors or IGBTs which generate heat while in operation. As the IGBTs heat up their efficiency goes down. In order to maintain a high level of efficiency the circuity can be directly cooled through the use of a heat sink.
Standard

Clamp Loads and Bending Stresses in Aircraft Tubing Installations

2020-10-09
CURRENT
AIR1593A
This SAE Aerospace Information Report (AIR) contains information relative to stresses and loads developed in tubes caused by tube deflections encountered in misaligned installations. Users are advised that when calculating the stresses and loads of a tubing system, the yield strength of existing loop clamp material is significantly lower than the tubing materials specified herein and should be considered.
Standard

Marine Exhaust Hose

2020-10-08
WIP
J2006
This SAE Standard covers the flexible components of marine engine wet exhaust systems from the connection at the engine exhaust manifold to the hull or overboard discharge fittings.
Standard

Dimensions and Tolerances for Coolant System Hoses

2020-10-01
WIP
J2387
The purpose of this SAE Recommended Practice is to provide dimensions for both standard and thin-wall hoses and to provide commercial and precision tolerances for SAE 20R3 and SAE 20R4 coolant system hoses.
Standard

Geometric Dimensions and Tolerancing for Curved Hose

2020-10-01
WIP
J2370
To provide the curved hose industry and their customers with a recommended practice for applying GD&T procedures to curved hoses and to provide generic curved hose drawings that represent the application of GD&T to typical curved hose parts. Dimensioning and Tolerancing will be in accordance with ASME Y14.5M.
Technical Paper

Application of Micro-Perforated Panel in Automotive Vehicle Noise Refinement

2020-10-01
2020-01-5078
To meet the regulatory requirements and improve passenger comfort inside the automotive vehicles, there is a need to reduce the interior noise levels. Generally, several components contribute to the interior noise rise in vehicles. The noise from the components can be reduced by directly working on the source or with passive methods. This paper focuses on the passive noise reduction methods. The passive method involves the usage of porous or fibrous sound-absorbing materials to absorb sound energy. The acoustic performance of these materials degrades because of heat, oil, and aging. In this paper, the application of acoustic material named micro-perforated panel (MPP) in an innovative way for sound absorption purposes is presented. These panels generally contain circular or slit-shaped perforations. The perforation sizes are generally in the submillimeter range.
Technical Paper

Engineering Approach for Noise Reduction for Automotive Radiator Cooling Fan: A Case Study

2020-10-01
2020-01-5085
The automotive radiator cooling fan is a device that can help regulate the engine temperature by moving air through a radiator. The common side effect of the radiator fan is the generation of flow-induced noise, which is a source of community noise, especially when the fan is operating in high-speed mode. In this paper, the detailed experimental studies for recognizing the source of the fan noise on one of the IKCO vehicles are carried out. Based on the experimental data, fan speed optimization and redesigning of the front bumper are selected as the main modification to the vehicle to reduce the noise level. The results revealed that the fan noise level could be dropped by about 7 dB. Since the applied solutions for noise reduction have impacts on the performance of the engine cooling system, a computational fluid dynamics (CFD) approach is conducted to study the side effects of applied modifications on the cooling system performance.
Technical Paper

Installation Effects on the Flow Generated Noise from Automotive Electrical Cooling Fans

2020-09-30
2020-01-1516
With the electrification of road vehicles comes new demands on the cooling system. Not the least when it comes to noise. Less masking from the driveline and new features, as for example, cooling when charging the batteries drives the need for silent cooling fans. In this work a cluster installation of electrical fans is studied in different generalized installations and operating conditions. The fans are installed in a test rig where the operation could be controlled varying the speed, flow rate and pressure rise over the fan. On the vehicle side of the fan a generalized packaging space (similar to an engine bay for conventional vehicles) is placed. In this packaging space different obstruction can be placed to simulate the components and radiators used in the vehicle. Here generalized simple blocks in different configuration are used to provide well defined and distinct test cases.
Technical Paper

Numerical Investigation of Narrow-Band Noise Generation by Automotive Cooling Fans

2020-09-30
2020-01-1513
Axial cooling fans are commonly used in electric vehicles to cool batteries with high heating load. One drawback of the cooling fans is the high aeroacoustic noise level resulting from the fan blades and the obstacles facing the airflow. To create a comfortable cabin environment in the vehicle, and to reduce exterior noise emission, a low-noise installation design of the axial fan is required. The purpose of the study is to investigate efficient computational aeroacoustics (CAA) simulation processes to assist the cooling-fan installation design. In this paper we report the current progress of the investigation, where the narrow-band components of the fan noise is focused on. Two methods are used to compute the noise source. In the first method the source is computed from the flow field obtained using the unsteady Reynolds-averaged Navier-Stokes equations (unsteady RANS, or URANS) model.
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