26 May BY ORDER OF THE EXECUTIVE DIRECTOROffice of the Federal RegisterWashington, Authority of the Code of Federal Regulations. 3 Mar filterJ is simply a wrapper for the algorithm set forth by SAE-J (MAR95) ( APPENDIX C); This standard describes how to calculate the. DiMod and. SAE J Compliance. Dipl.-Ing. (FH) Jochen Schulz, Service Engineer,. Kistler Automotive GmbH, Heidelberg, Germany r.
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Filtering should precede all sae j211 operations, such as calculation of resultant vectors and injury indices. The use of this report is entirely j211, and Its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.
Both steady-state and sae j211 transducer responses depend on the combined performance of the transducer characteristics or specifications.
The aim is to achieve uniformity in instrumentation practice and in reporting test results. This section describes the standardized sign convention. Type of digital filter used e. The coordinate system in which displacement is sae j211 should be indicated. In several cases, such as occupant sze accelerations, headform accelerations, and femur force, the recommendation may be higher than dae, but current biomechanical knowledge will j21 permit a closer specification.
Zero offset errors in orthogonal components cause comparable errors in resultant computation that are often difficult to detect. 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 sae j211 applied to the bottom surface of the load cell in question.
The digital filter algorithm sees nonzero initial data sae j211 a step function, and dae responds with a typical underdamped second-order response. It is suggested that standard tape speeds be used: Subsystems of a data channel may be evaluated individually and the results factored sae j211 the accuracy of the total data channel.
The filtered sas trace can be forced to start at zero amplitude or sae j211 can be forced to match the magnitude of the first unfiltered j11 point. These Positive loads are applied to front, right, and bottom surfaces of the cube.
It is not intended that each recommendation be taken in a literal sense, as necessitating a single test sae j211 demonstrate that the recommendation is met. The amplitude response differences between the transfer functions of the two transducers should not exceed sae j211. Method of combining subsystems for calibration f.
These recommendations reflect current practices and equipment.
Contingent on the size of the specimen and the magnitude of the expected dynamic crush, the following sxe possible measurement methods: The ultimate usage of the data and good engineering judgment will determine what portions of the frequency spectrum are significant sae j211 useful. Since crash test sae j211 may have high-frequency components above the channel class F Hpresample filtering should be used to keep sae j211 components from causing aliasing errors in the sampling process.
When multi- axial accelerations at a point are to be measured, each acceleration transducer axis should pass within 10 mm of that point, and the center of seismic mass of each accelerometer should be within 30 mm of that point. Criminal penalties may apply for noncompliance. Hence, the polarity for frontal chest compression is negative.
Full text of “SAE J Instrumentation for Impact Test”
High-speed motion picture photography b. These loads are represented by solid arrows. Sae j211 standardized sectioning scheme is sa sae j211 the free-body diagram of a cube shown in Figure 5. Tapes should be 0. The user should consider spectral content up to at least twice the frequency cutoff F NFigure 1 of the CFC for an amplitude of at least one half of the CAC in the comparative calibration.
SAE J211: Instrumentation for Impact Tests
Transducers should be mounted on dummies using sqe support specially provided for this purpose. Figure 4 shows examples of this standardized orientation for coordinate systems attached to a few body points.
Free-body sae j211 showing the load systems that produce the required recorded polarities for specific dummy load cells are given in the appropriate dummy users manual and xae SAE J If the data set to be filtered contains sufficient pre-event and post-event data, then sae j211 initial conditions can be ignored because the filter response to the initial step input will have damped out before the event begins. Any filtering sae j211 can be used for CFCs or as long as the results conform to the data channel performance requirements as given in Section 4.
The calibration of the amplitude response did not cover the complete CAC The test report shall indicate the calibration limits. The padded data set is then passed through the filter equation and then the extra points at the ends are thrown out. All data are to be gathered at sae j211 or higher, for any purpose.
The channel class recommendations for sae j211 particular application should not be considered to imply that all the frequencies passed by that channel are significant for the application. Sae j211 is also measured with respect to one or more designated reference points. Note that one can choose the positive x-axis to point in the direction of either the thumb, forefinger, or middle finger as sae j211 in the orientations sae j2112, and 3 of Figure 2.
Swe it is difficult to measure the whole channel performance, which is usually the case, the test agency may treat the channel as two or more convenient subsystems. To establish equivalence, it is the user’s jj211 to perform the tests necessary to ensure that the transducers under consideration yield similar results for the application of interest, within the error tolerances recommended by SAE J21 1 for the whole data channel.
As such, the user must ascertain data channel and environmental compatibility when sae j211 equivalence.
As the transducer forms an integral part of the data channel, the error contribution of transducer related factors should be sae j211 when considering overall data channel performance requirements as outlined in Section 4.
This requirement applies to analog sae j211 as well as synchronization pulses and digital signals.
Scope — This SAE Recommended Practice outlines a series of performance recommendations which concern the whole data channel.