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Technical Paper

A Computer Program for Truck Frame Design

Abstract The classical methods of deflection analysis are finding more application to complex automotive chassis frame structures. Much too time consuming for manual application, they are now coming into more widespread use with the aid of high-speed computers. This paper describes a computerized deflection analysis for complete truck frames under the cases of torsion and flexure. The rapid, accurate analysis permits investigation of more design problems resulting in the eventual production of more efficient frame structures.
Technical Paper

Automotive Dynamic Testing - A Modern Approach to a Modern Need

A versatile full vehicle test facility incorporating electro-hydraulic excitation and novel facility design offers great potential for useful testing. Facility description, application, and results produced are discussed and illustrated. Much development effort went into the evolution of the test equipment which was designed to meet objectives of both durability and vibrational measurements. Advantages of pit installation for the seismic mass and power room are aspects of the physical setup contributing efficiency and cleanliness. Programming techniques used to obtain good results with the equipment include magnetic tape profiles of durability courses as well as function generators and the system master program panel.
Technical Paper

Application of Variable Depth Siderail to Heavy Truck Frames

The heavy truck frame design engineer is faced with many factors when selecting a frame siderail. These factors must be weighed if the siderail is for one truck for a special application, or for a family of frames for tens of thousands of trucks involving the entire spectrum of heavy truck usage. In this paper the various parameters of side bar selection are explored, and a lighter, less expensive design presented for higher gvw siderail applications.
Technical Paper

THE CADILLAC FRAME: A New Design Concept for Lower Cars

THE 1957 Cadillac frame is a significant step in design progress toward the ever lower passenger cars demanded by customers and, therefore, car manufacturers. Stemming from tests and experimental designs in process since 1950, this frame combines reduction in height with a slight increase in structural efficiency. It reverses the trend toward the more costly and heavier structures usually associated with lower cars. Mr. Milliken discusses in Part I the steps Cadillac has taken in the last 19 years to reduce the height 9½ in. to 55½ in. The “Tubular Cenrer-X” frame of the 1957 Eldorado Brougham was the latest and most successful answer to the problem. In Part II Mr. Parker describes the A. O. Smith Corp.'s development of the basic idea and the experimental phases and testing which led to the production designs.