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Radius-of-Load or Boom Angle Indicating Systems

Cranes and Lifting Devices Committee
  • Ground Vehicle Standard
  • J375_201906
  • Current
Published 2019-06-10 by SAE International in United States
This SAE Recommended Practice applies to cranes used in lifting-crane service which are equipped with radius-of-load or boom angle indicating devices.
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Load Indicating Devices in Lifting Crane Service

Cranes and Lifting Devices Committee
  • Ground Vehicle Standard
  • J376_201906
  • Current
Published 2019-06-10 by SAE International in United States
This SAE Recommended Practice applies to cranes equipped with load indicating devices used in lifting crane service.
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Performance Testing and Analysis of Multi-Channel Active Control System for Vehicle Interior Noise Using Adaptive Notch Filter

Tongji University-Lijun Zhang, Xiyu Zhang, Dejian Meng
Published 2019-06-05 by SAE International in United States
It is considered that slow convergence speed and large calculation amount of commonly used adaptive algorithm in the active control system for vehicle interior noise yield noise reduction performance and hardware requirements problems. In this paper, a 4-channel active control of vehicle interior noise based on adaptive notch filter is established, and road test is carried out to test and analyze the performance of the control system. Firstly, the general mathematic model of the multi-channel active control system based on adaptive notch filter is established. The computational complexity of the algorithm is analyzed and compared with that of the FXLMS algorithm. Secondly, a hardware-in-the-loop test bench based on multi-channel adaptive notch filter is set up, to measure the noise reduction performance of ANC system under various working conditions. Finally, the typical test conditions are designed to test the system noise reduction performance, and the road test is carried out and result is analyzed.
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New Performance Metrics for Lidar

Autonomous Vehicle Engineering: May 2019

Indu Vijayan
  • Magazine Article
  • 19AVEP05_07
Published 2019-05-01 by SAE International in United States

Frame-rate measurement is so yesterday. Object-revisit rate and instantaneous resolution are more relevant metrics, and indicative of what a lidar system can and should do, argues a revolutionary in the artificial-perception space.

How do you measure the effectiveness of an intelligent, lidar-based perception system for autonomous vehicles? Conventional evaluation metrics favor frame rate and resolution as the ideal criteria. However, experts at Pleasanton, Calif.-based artificial perception company AEye believe that these criteria are inadequate for measuring the unique capabilities of more advanced lidar systems, nor do they explicitly address real-world problems facing autonomous driving, such as hazard detection and tracking.

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Color and Height Characteristics of Surrogate Grass for the Evaluation of Vehicle Road Departure Mitigation Systems

Indiana University; Purdue University-Qiang Yi, Dan Shen, Jun Lin, Stanley Chien, Lingxi Li, Yaobin Chen
Toyota Motor Corp.-Rini Sherony
Published 2019-04-02 by SAE International in United States
In recent years Road Departure Mitigation Systems (RDMS) is introduced to the market for avoiding roadway departure collisions. To support the performance testing of the RDMS, the most commonly seen road edge, grass, is studied in this paper for the development of standard surrogate grass. This paper proposes a method for defining the resembling grass color and height features due to significant variations of grass appearances in different seasons, temperatures and environments. Randomly selected Google Street View images with grass road edges are gathered and analyzed. Image processing techniques are deployed to obtain the grass color distributions. The height of the grass is determined by referencing the gathered images with measured grass heights. The representative colors and heights of grass are derived as the specifications of surrogate grass for the standard evaluation of RDMS.
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Evaluation of After-Market Light Emitting Diode Headlight Bulbs

Rensselaer Polytechnic Institute-Yi-wei Liu, John Bullough
Published 2019-04-02 by SAE International in United States
Taking advantage of growing consumer interest in light emitting diode (LED) headlights, an increasing number of after-market LED replacement bulbs is available on the market. They are designed to have similar socket shapes and sizes as halogen bulbs, in order to fit into existing headlight housings. Although none of these LED replacement bulbs conform to present federal headlighting regulations, and some are labeled for "off road use" only, others claim to meet current regulations. Regardless, many different LED bulbs can be easily purchased and installed by vehicle owners, who may or may not be aware of their regulatory status. Several different LED replacement bulb kits, each designed to replace a conventional 55-W H11 halogen bulb, were purchased and tested in three different low-beam headlight units. Photometric measurements at several critical test points for headlight performance revealed that none of the resulting distributions met all of the test point photometric requirements. Some intensity values were lower than allowed minima while others exceeded allowed maxima. Photographs of the resulting beam patterns for each combination of LED bulb…
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Fittings, Weld, Fluid Connection, 5000 psi Maximum

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS4510A
  • Current
Published 2019-03-26 by SAE International in United States
This SAE Aerospace Standard (AS) establishes the requirements for weld fluid connection fittings and rings to be orbital arc welded to tubing for use in aircraft fluid systems up to a maximum operating pressure of 5000 psi.
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Effect of Slot and Chamfer Shape of Brake Pad on Mode Coupling

Chulalongkorn University-Sirapath Yeamdee, Thiti Bovornratanaraks, Chanat Ratanasumawong
Compact International (1994) Co., Ltd.-Meechai Sriwiboon
Published 2019-03-25 by SAE International in United States
In the present, one of the essential quality concerns in the automotive industry is brake squeal. Brake pad shape is one of the factors affecting to brake vibration and squeal noise. This research aims to study the effect of slot and chamfer shape on mode coupling through the Finite Element Analysis (FEA), impact hammer testing and performance test from dynamometer. The results can be used to develop geometry of the brake pad surface that leads to brake squeal reduction in the design stage. The natural frequencies and mode shape of brake components calculated by FEA are compared with the impact hammer testing to ensure the accuracy of the results. The FE results are also verified through the standard test with a dynamometer.
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Air Brake Actuator Test Procedure, Truck-Tractor, Bus, and Trailers

Truck and Bus Brake Actuator Committee
  • Ground Vehicle Standard
  • J1469_201903
  • Current
Published 2019-03-20 by SAE International in United States
This SAE Recommended Practice provides procedures and methods for testing service, spring applied parking, and combination brake actuators with respect to durability, function, and environmental performance. A minimum of six test units designated A, B, C, D, E, and F are to be used to perform all tests per 1.1 and 1.2.
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Braking Performance - Rubber-Tired, Self-Propelled Cranes

Cranes and Lifting Devices Committee
  • Ground Vehicle Standard
  • J1977_201902
  • Current
Published 2019-02-27 by SAE International in United States
This SAE Standard applies to machines as defined in Appendix A. Some of these machines can travel on-highway, but function primarily off-highway.
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