Development of Jig to Determine Center of Gravity for Vehicle Seats (Unsymmetrical Three Dimensional Bodies) for Automotive Regulatory Test

This article brings a practical analysis for determination of gravity center in unsymmetrical three dimensional bodies practically and graphically.

The gravitational center of an object is the point from which if suspended, the object remains stable at all times, this is also called as center of mass of the object, or the theoretical point at which the entire weight of the object is assumed to be concentrated. In certain tests, the Center of Gravity (CG) of the Seat is required to be known, for load application. The CG is the point at which a SEAT would balance if it were possible to suspend it at that point.

This paper deals with use of applied engineering and theoretical calculations to ascertain the CG of First and Second Row seats (individual and bench type).

In this case the center of gravity location is expressed in units of length along each of three axes (X, Y and Z).

Load balance equation is used to calculate the CG of the seat. Relevant equation as given in Eqn. 1.

The performance and design criteria of seat systems require that the seat should be lighter for reduced fuel consumption while still meeting the safety requirement for seat including headrests and seat back static and dynamic structural performance.

Other safety requirements for the seat are the seat belt anchorage, luggage retention capability, child seat anchorage and top tether requirements as defined by pertinent regulation.