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Development of a Passenger Vehicle Seat Center-of-Gravity Measuring Device
- Technical Paper
- 2020-01-1061
To be published on
2020-04-14
by SAE International in United States
A machine has been developed to measure the center-of-gravity (CG) location of a seat. This machine uses a system of pivots, a yaw bearing and two sensors to get the X, Y and Z CG of the seat. Test object mass is measured separately on a scale. A stable pendulum arrangement is used to get the CG location. Governing equations for the machine are shown in the paper and a typical test procedure is discussed. An error analysis is discussed and shows the requisite accuracy of platform angle, geometric dimensions, seat weight and applied weight in order to achieve the desired 3 mm accuracy target. A full system statistical analysis demonstrates that all X and Y CG locations, when compared with theoretical values, are off by less than 1 mm and well within the 3 mm accuracy target. For Z CG, the errors were shown to be 3.3 mm or lower with 95 percent confidence.
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Invesstigation of test method to reproduce Car-to-Car side impact
- Technical Paper
- 2020-01-1221
To be published on
2020-04-14
by SAE International in United States
Side impact is one of the severest crash modes among real-world accidents. In US market, even though most of vehicles recently have achieved top rating in crash performance assessment programs, it is reported that there is hardly any sign of decreasing trend in side-impact fatalities for the last few years. In response to this trend, IIHS is planning to introduce a new test protocol. One of clarification points on current side impact tests is whether the present side Moving Deformable Barrier (MDB) test reproduces real-world Car-to-Car (C2C) crash. Hence, this study addressed to identify key factors to reproduce C2C side impact by a series of parametric CAE study of MDB as follows: i) with and without suspension of MDB ii) change of height of Center Of Gravity (COG) of MDB ⅲ) barrier dimensions iv) barrier stiffness. Reproducibility of the MDB tests in the CAE study was evaluated by three indices of struck vehicle such as (1) kinematics, (2) body deformation modes (Plan and Front View) and (3) dummy injuries. As a result, it was found…
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Landing Gear Fatigue Spectrum Development For Part 25 Aircraft
- Aerospace Standard
- AIR5914
- Current
Published
2020-02-28
by SAE International in United States
This SAE Aerospace Information Report (AIR) provides guidelines for the development of landing gear fatigue spectra for the purpose of designing and certification testing of Part 25 landing gear. Many of the recommendations herein are generalizations based on data obtained from a wide range of landing gears. The aircraft manufacturer or the landing gear supplier is encouraged to use data more specific to their particular undercarriage whenever possible.
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Performance Requirements for Determining Tow-Vehicle Gross Combination Weight Rating and Trailer Weight Rating
- Ground Vehicle Standard
- J2807_202002
- Current
Published
2020-02-13
by SAE International in United States
This document establishes minimum performance criteria at GCWR and calculation methodology to determine tow-vehicle TWR for passenger cars, multipurpose passenger vehicles, and trucks. This includes all vehicles up to 14000 pounds GVWR.
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Study of Rider Model for Motorcycle Racing Simulation
- Technical Paper
- 2019-32-0572
Published
2020-01-24
by Society of Automotive Engineers of Japan in Japan
Various rider models have been proposed that provide control inputs for the simulation of motorcycle dynamics.However, those models are mostly used to simulate production motorcycles, so they assume that all motions are in the linear region such as those in a constant radius turn. As such, their performance is insufficient for simulating racing motorcycles that experience quick acceleration and braking.Therefore, this study proposes a new rider model for racing simulation that incorporates Nonlinear Model Predictive Control. In developing this model, it was built on the premise that it can cope with running conditions that lose contact with the front wheels or rear wheels so-called "endo" and "wheelie", which often occur during running with large acceleration or deceleration assuming a race. For the control inputs to the vehicle, we incorporated the lateral shift of the rider's center of gravity in addition to the normally used inputs such as the steering angle, throttle position, and braking force.We compared the performance of the new model with that of the conventional model under constant radius cornering and straight braking,…
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A Recommended Method of Analytically Determining the Competence of Hydraulic Telescopic Cantilevered Crane Booms
- Ground Vehicle Standard
- J1078_202001
- Current
Published
2020-01-15
by SAE International in United States
This analysis applies to crane types as covered by ASME B30.5.
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Performance Standard for Child Restraint Systems in Transport Category Airplanes
- Aerospace Standard
- AS5276/1
- Current
Published
2019-10-31
by SAE International in United States
This SAE Aerospace Standard (AS) defines minimum performance standards and related qualification criteria for add-on child restraint systems (CRS) which provide protection for small children in passenger seats of transport category airplanes. The AS is not intended to provide design criteria that could be met only by an aircraft-specific CRS. The goal of this standard is to achieve child-occupant protection by specifying a dynamic test method and evaluation criteria for the performance of CRS under emergency landing conditions.
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Towing Equipment Ratings and Practices
- Ground Vehicle Standard
- J2512_201910
- Current
Published
2019-10-24
by SAE International in United States
This SAE Recommended Practice applies to all trucks that are equipped with armlift bodies, carrier bodies, wheel lift bodies, wrecker, and underlift bodies. Additional rating methods are provided for tow slings, truck hitches, and chain assemblies.
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Aircraft New Tire Standard - Bias and Radial
- Aerospace Standard
- AS4833A
- Current
Published
2019-10-17
by SAE International in United States
This SAE Aerospace Standard (AS) sets forth criteria for the selection and verification processes to be followed in providing tires that will be suitable for intended use on civil aircraft. This document encompasses new and requalified radial and bias aircraft tires.
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Vehicle Lift Points for Service Garage Lifting
- Ground Vehicle Standard
- J2184_201910
- Current
Published
2019-10-16
by SAE International in United States
This SAE Standard is directed at the proper communication of the lift points on the vehicle frame or underbody to commercial service personnel for the purpose of raising passenger vehicles, light trucks, and vans completely off the shop floor. To this end, vehicle manufacturers are guided in the proper design of a lift point label and lift points located on the body/frame for use by service garages.