Development of a Passenger Vehicle Seat Center-of-Gravity Measuring Device SEA, Limited

Format:

Book

Conference/Event

Author/Creator:

Zagorski, Scott, author.

Contributor:

Andreatta, Dale

Heydinger, Gary

Conference Name:

WCX SAE World Congress Experience (2020-04-21 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2020

Summary:

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 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. The two sensors used are an inclinometer and a rotary encoder. Custom software is used to record the measurements from the sensors. The software performs all calculations, guides the user through the test sequence, and checks for possible testing errors

Notes:

Vendor supplied data

Publisher Number:

2020-01-1061

Access Restriction:

Restricted for use by site license