Performance Requirements for R-134a and R-1234yf Refrigerant

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Not applicable. 1. SCOPE

This SAE Recommended Practice describes the test procedures for conducting frontal impact occupant restraint and equipment mounting integrity tests for ambulance patient compartment applications. Its purpose is to describe crash pulse characteristics and establish recommended test procedures that will standardize restraint system and equipment mounting testing for ambulances. Descriptions of the test set-up, test instrumentation, photographic/video coverage, and the test fixtures are included. 2. REFERENCES

2.1 Applicable Publications

The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1 SAE Publications

Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), c8da000b01f69e314232945d .SAE J211-1 Instrumentation for Impact Test—Part 1: Electronic Instrumentation SAE J211-2

Instrumentation for Impact Test—Part 2: Photographic Instrumentation

SAE Engineering Aid 23 ”Users’ Manual for the 50th-Percentile Hybrid-III Test Dummy,” June 1985

Current, R.S., Moore, P.H., Green, J.D., Yannaccone, J.R. et al., "Crash Testing of Ambulance Chassis Cab Vehicles," SAE Technical Paper 2007-01-4267, 2007 2.2 Other Publications

Code of Federal Regulations, Title 49, Part 571.208. Code of Federal Regulations, Title 49, Part 571.214. Code of Federal Regulations, Title 49, Part 572

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SAE J2917 Issued MAY2010 Page 2 of 4

3. TEST DUM M IES

For the dynamic tests described in the following sections, restraint systems should be evaluated with the aid of a test dummy. The test dummy should be of a type that will closely represent the size, weight, and articulation characteristics of

a 50th percentile male in a seated position. Examples of such a test dummy include the Hybrid-III and Euro SID2 with rib

extensions 50th percentile male anthropomorphic test devices (ATD). The dummy should be selected appropriately based on the orientation of the seat relative to the direction of travel and the purpose of the test. The physical characteristics of these ATDs are described in 49 CFR 572 subparts E and U.

Applicable measurement capabilities of the Hybrid-III 50th percentile male test dummy are described in 49 CFR 571.208 and applicable measurement capabilities of the Euro SID2-re 50th percentile male test dummy are described in 49 CFR 571.214.

Test dummies of other sizes (i.e., 95th-percentile male, 5th-percentile female, etc.) may be used to evaluate restraint system performance for various occupant sizes.

4. DYNAMIC SLED TESTS

For the restraint system tests, all interior cab components that are potential occupant contact surfaces (cabinets, countertops, patient cots, etc.) shall be installed on the test sled. Proper geometry relative to the components being tested should be maintained. Wherever practicable, actual production components should be used. If not, components with performance characteristics near those expected for production should be used. Seat tethers should be set according to the manufacturer’s specifications. The primary purpose of this test is to evaluate restraint system performance, occupant excursion, equipment mounting integrity, and occupant interaction with interior components when subjected to a representative real-world frontal crash pulse.

4.1 Test Fixture

For the frontal impact tests, a sled fixture mounted on a uni-directional tracking system is required. Typical sled fixture systems are of the deceleration and acceleration types. For the deceleration system, the sled fixture is accelerated to a desired speed and then decelerated through the programmed pulse via energy-absorbing methods (i.e., honeycomb, extruded steel rods, etc.). For the acceleration system, the programmed pulse is applied as a rearward acceleration to the sled fixture, which is initially at rest.

4.2 Frontal Impact Sled Pulse Specification

For frontal impact tests, a sled deceleration pulse is applied parallel to the vehicle longitudinal axis. The pulse profile must fall within the corridor delineated by the plots in Figure 1 and the values in Table 1. Total velocity change during the test shall be 31 mph ± 1 mph.

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SAE J2917 Issued MAY2010

Page 3 of 4

FIGURE 1 - DYNAMIC SLED CORRIDOR

TABLE 1 - DYNAMIC SLED CORRIDOR BREAK POINTS

Position

Time (sec)Acceleration

(g)

Position

Time (sec)Acceleration

(g)

A 0.000-4.0I 0.0040.0

B 0.005-17.5J 0.014-13.5

C 0.020-17.5K 0.016-13.5

D 0.028-14.0L 0.023-9.5

E 0.045-14.0M 0.055-9.5

F 0.055-22.5N 0.063-17.5

G 0.082-22.5O 0.075-17.5H

0.125

0.0

P

0.090

0.0

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SAE J2917 Issued MAY2010 Page 4 of 4

4.3 Dummy Positioning

Test dummy positioning procedures for this testing should be consistent with the positioning procedures outlined in

49 CFR 571.208 and 49 CFR 571.214, where practicable.

5. INSTRUM ENTATION

To record the deceleration pulse accelerometers may be mounted to the sled fixture. Dummy instrumentation may include any of the measurements mentioned in Section 3. Dynamic seat belt loads may be recorded by installing webbing load transducers on the seat belts. All measurements should be recorded and filtered according to the most recent version of SAE J211-1 and SAE J211-2.

6. PHOTOGRAPHIC INSTRUM ENTATION

High-speed cameras should be used to document the dynamic tests. The field of view of these cameras should be large enough to document the entire range of motion of the test dummy and/or mounted equipment during the deceleration event. Wherever possible, off-board cameras should be used to allow for the use of longer focal-length lenses and, therefore, less lens distortion error when performing analysis of the high-speed footage.

If complete coverage of occupant kinematics is not possible with off-board cameras only, the use of on-board cameras will be required.

Each high-speed camera should operate at a frame rate sufficient to facilitate motion analysis of the film. A minimum frame rate of 500 frames per second is recommended. Sufficient reference targets, both stationary and on the test sled/fixture and test dummy, should be provided. Provisions should be made for synchronizing electronic and photographic instrumentation. Wherever possible, the cameras should be mounted such that they are perpendicular to the axis of motion.

7. NOTES

7.1 M arginal Indicia

A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions,

not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only.

PREPARED BY THE SAE TRUCK CRASHWORTHINESS COMMITTEE OF THE

SAE TRUCK AND BUS BODY AND OCCUPANT ENVIRONMENT STEERING COMMITTEE

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