# SAE J670 EBOOK

SAE-Jpdf - Download as PDF File .pdf), Text File .txt) or read online. 年5月18日 In addition, new SAE and ISO standards have been published since the last revision of SAE J that directly relate to topics considered in. SAE J (R) Vehicle Dynamics Terminology. SAE J Edition, January eBooks (PDFs) are licensed for single-user access only.

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The vehicle dynamics terminology presented herein pertains to passenger cars and light trucks with two axles and to those vehicles pulling. download SAE J VEHICLE DYNAMICS TERMINOLOGY from SAI Global. SAE Recommended Practice Je, Vehicle Dynamics Terminology ISO are designated SAE and ISO, respectively, in parentheses.

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One can choose the positive x-axis to point in the direction of either the thumb, forefinger, or middle finger as shown in the configurations 1, 2, and 3 of Figure 1. However, once this decision is made then the positive directions of the y and z axes must be as indicated by the corresponding configuration shown in Figure 1.

Note that these three configurations of x, y, z axes always define a right-handed coordinate system independent of the orientation of the Sections 4 and 5 will define standardized orientations of coordinate systems for the vehicle and dummy, respectively.

The use of this report is entirely voluntary, and its application and suitability for any particular use, including any patent infringement therefrom, is the sole responsibility of the user.

## Vehicle Dynamics Terminology

SAE invites your written comments and suggestions. Printed In U. A 1 Positive angular motion and moment directions are determined by the right-handed screw rule.

If any of the three positive axes is grasped with the right hand with the thumb extended in the positive direction, as shown in Figure 2 for the x-axis, then the curl of the fingers indicate the positive direction for angular motions and moments with respect to that axis.

These orientations are shown in Figures 3 and 4, respectively.

## Tire axis system and terminology defined by SAE standards

A coordinate system can be affixed to any point on the dummy. Figure 5 shows examples of this standardized orientation for coordinate systems attached to a few body points. Note that as the dummy is articulated to sit in a vehicle or during a test the coordinate systems rotate with their respective dummy parts. NOTEEffective unsprung mass is not the same as the unsprung mass, in that it considers effects due to the rotational motion and rotational inertia of the suspension links, which usually decreases the apparent unsprung mass.

This distinction may be important when performing certain dynamic analyses e.

The value of effective unsprung mass may be different for different directions of excitation. Typically, effective unsprung mass is separately defined for the front and rear axles and, further, for independent suspensions, for individual suspension corners.

The location being referenced must be explicitly identified e. The sprung weight is the vehicle operating weight less the unsprung weight.

It includes descriptions of the fuel load and the payload, and the location s of the payload. The conventional mass of a passenger is fixed at 68 kg lb.

NOTEFor trailers with a simple ball hitch, the articulation point is coincident with the center of the hitch ball.

The unsprung weight includes the weight of the tires and wheels and all parts that move directly with the tires and wheels, plus a portion of the weight of the suspension linkages, ride springs, and driveshafts. NOTEIt is common practice to include one-half the weight of the suspension linkage, ride springs, and driveshafts in the unsprung weight.

For more detailed analyses, the weight distribution of the individual suspension links may need to be considered.

Unsprung weight may also be separately defined for the front and rear axles and, further, for independent suspensions, for individual suspension corners. If unsprung weight is defined for subsets of the total unsprung weight, the location being referenced must be explicitly identified e.

## SAE-Jpdf

NOTEUnsprung mass may also be separately defined for the front and rear axles and, further, for independent suspensions, for individual suspension corners.

If unsprung mass is defined for subsets of the total unsprung mass, the location being referenced must be explicitly identified e.Slip ratio is a means of calculating and expressing the slipping behavior of the wheel of an automobile. In addition, the lack of understanding by contractors and users of equipment characteristics and operating systems often results in a wrong fit and a costly reliability problem.

The content of these new standards also indicated the need to revise SAE J A 1 Positive angular motion and moment directions are determined by the right-handed screw rule. NOTEThe symbols H or h are commonly used for the height of the vehicle center of gravity above ground, with the suspensions in equilibrium and the vehicle at rest on a flat, level surface. A coordinate system based on the wheel axis system with the origin fixed at the wheel center. The center of gravity of the total vehicle at a given load condition.

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Printed In U. Unsprung weight may also be separately defined for the front and rear axles and, further, for independent suspensions, for individual suspension corners.

It includes descriptions of the fuel load and the payload, and the location s of the payload.