Printed in U.S.A. SAE J Revised MAR95 2. References The following publications form a part of the specification to the extent specified herein. Unless . 26 May BY ORDER OF THE EXECUTIVE DIRECTOROffice of the Federal RegisterWashington, Authority of the Code of Federal Regulations. 1 Jan Buy SAE J INSTRUMENTATION FOR IMPACT TEST – PART 1 – ELECTRONIC INSTRUMENTATION from SAI Global.
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Dotted arrows indicate direction of loads applied to the back, left, and top for static equilibrium.
For this posture, the positive y-axis will be directed from the dummy’s left to its right side, the positive z-axis will be directed downward from head to toe, and the positive x-axis will be directed forward. Description of designated reference points and locations of vehicle accelerations c. Polarities of Measured External Loads — For load cells that measure loads applied directly to the dummy or vehicle structure, their recorded output polarities should be consistent with the direction of the applied external load referenced to the standardized coordinate system at the point of the load application.
Unless otherwise indicated the latest revision of SAE publications shall apply. However, it is recognized that other considerations for example, biomechanics may impose special instrumentation requirements.
By default, this function will create the coefficients, and if the Signal Processing Toolbox is installed filter the input signals. In general, a sufficient number of measurements should be carried out in order to ensure the linearity in the range of interest, that is, between F L and F H.
It is important to note that valid comparisons using different frequency response classes may be difficult to make. The whole channel performance could then be demonstrated on the basis of subsystem results, together with a rationale for combining the subsystem results together. The least significant bit should correspond to approximately 0. Discover Live Editor Create scripts with code, output, and formatted text in a single executable document. For example, frontal chest compression is the distance that the sternum moves relative to the thoracic spine.
See SAE Paper Tom Prohaszka Tom Prohaszka view profile. It is useful to establish specific frequency response classes when comparing test results from different sources. For example, upper and lower neck, lumbar spine, and upper and lower tibia load cells should have positive recorded outputs when the dummy is sectioned below the load cell in question and positive loads are applied to the bottom surface of the load cell in question.
Principal axes of load cell are aligned parallel to respective axes of local dummy coordinate system. Search the history of over billion web pages on the Internet. These classifications are needed to calculate head impact forces based on neck forces and head accelerations when using the Hybrid III crash test dummy.
Note that one can choose the positive x-axis to point in the direction of either the thumb, forefinger, or middle finger as shown in the orientations 12, and 3 of Figure 2. It is assumed that the load cell of interest is contained within the cube and responds to loads applied to the surfaces of the cube. Free-body diagrams showing the load systems that produce the required recorded polarities for specific dummy load cells are given in the appropriate dummy users manual and in SAE J This can be done by copying at least 10 ms of data after the starting point and transposing the copied data about the time and magnitude axes, either about the 0,0 coordinate point as shown in Figure C3, or about the first data point as shown in Figure C4.
Zero offset errors in orthogonal components cause comparable errors in resultant computation that are often difficult to detect.
SAE J211-1: Instrumentation for Impact Test
It should also be recorded in film data through strobe lights or timing mark channels. In cases where properties of nonmechanical test subjects preclude rigid transducer mounting, an analytical or experimental evaluation of mounting effects on the data should be provided.
This includes the transducer, that is, the input is the excitation to the transducer. The purpose of SAE J21 1 is to recommend “techniques of measurement used in impact tests” which “will provide a basis for meaningful comparison of test results from different sources. Updates 25 Jan 1.
Based on your location, we recommend that you select: Select a Web Site Choose a web site to get translated content where available and see local events and offers. If j121 data are not available then special techniques must be applied to eliminate the filter start-up effects from the filtered data set.
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This is expressed in terms of the measured variable input. This number and the value of the frequency F H in hertz are numerically equal.
In anatomical terminology, the positive x-axis is directed from the posterior to the anterior P-Athe positive y-axis is directed from the left to right L-Rsa the positive z-axis is directed from superior to inferior S-l. Select the China site in Chinese or English for best site performance. Use of this document will provide a basis for meaningful comparisons of test results from different sources.