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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. Among other things these quantities are useful in studying ride comfort levels of a seat as well as determining the load application location needed during an endurance or strength test. The device is a derivative of a previously developed machine (C1000) that measures the three moments and three products of inertia, plus the CG location. This machine uses a system of pivots, a yaw bearing and two sensors to get the X, Y and Z CG of the seat. Object mass is measured separately on a scale. A stable pendulum arrangement is used to get the CG location. Based on the customer’s requirements one of the unique design criteria was the need to measure a light seat attached to a heavy fixture; approximately a 1:6 ratio. This resulted in having a short pivot height (13.1 in, 332.7 mm) and the need to know seat weight to 0.05 kg (0.1 lbs) or better. Governing equations for the machine are shown in the…
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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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new
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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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.
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Setting Preload in Heavy-Duty Wheel Bearings
- Ground Vehicle Standard
- J2535_201910
- Current
Published
2019-10-07
by SAE International in United States
This SAE Recommended Practice applies to the four primary, large volume applications in the class 7-8 heavy-duty market place, as specified in SAE J1842: a “N” trailer axle b “R” powered rear axle c “FF / FG” nonpowered front axle d “P” trailer axle This document applies to on-highway applications. It is not applicable to those applications that exceed the GAWR ratings or the load line restrictions listed in columns “A,” “B,” and “C” of Table 1. Load lines are measured from the inboard bearing cup backface as shown in 3.4. This document establishes preload force values only. The methodology to obtain these force values must be determined by the fastener supplier and/or axle assembler. This document reviews the bearing system. It is NOT intended to prescribe (new or existing) axle and/or hub manufacturers’ ratings and/or specifications.
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Method for Predicting Lateral Attenuation of Airplane Noise
- Aerospace Standard
- AIR5662
- Current
Published
2019-10-04
by SAE International in United States
This document describes analytical methods for calculating the attenuation of the level of the sound propagating from an airplane to locations on the ground and to the side of the flight path of an airplane during ground roll, climbout after liftoff, and landing operations. Both level and non-level ground scenarios may be modeled using these methods, however application is only directly applicable to terrain without significant undulations, which may cause multiple reflections and/or multiple shielding effects. This attenuation is termed lateral attenuation and is in excess of the attenuation from wave divergence and atmospheric absorption. The methods for calculating the lateral attenuation of the sound apply to: turbofan-powered transport-category airplanes with engines mounted at the rear of the fuselage (on the sides of the fuselage or in the center of the fuselage as well as on the sides) or under the wings propeller-driven transport-category or general-aviation airplanes propagation over ground surfaces that may be considered to be “acoustically soft” such as lawn or field grass situations where the terrain to the sides of the flight…
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Motor Vehicle Seating Systems
- Ground Vehicle Standard
- J879B_201910
- Current
Published
2019-10-02
by SAE International in United States
This SAE Recommended Practice establishes uniform test procedures and certain minimum performance requirements for motor vehicle seats and seat adjusters. It is limited to tests that can be conducted on uniform test fixtures and equipment available in commercial laboratory test facilities. This practice includes a minimum requirement for horizontal forward loads encountered in vehicle forward impacts, and horizontal loads obtained by impacting the vehicle from the rear. The requirements and test procedures in this recommended practice reflect current technology and industry experience. It is intended to subject this recommended practice to a continuing review and revision as technology advances and experience is expanded.