ISO IEC 9899:2018 pdf free download.Wheelchairs Part 6 : Determination of maximum speed of electrically powered wheelchairs.
Introduction
Maximum speed can be an important factor in the selection of the most appropriate wheelchair for individual people.
Maximum speed can have an influence on whether an electrically powered mobility device may be used on or off footpaths, or both, depending upon local legislation. Some people’s main concern may be to travel as fast as possible, whereas other people may be apprehensive of higher speeds. In addition, other tests in the ISO 7176 series may require the determination of maximum speed in order to carry out their procedures.
These tests specify a consistent method of determining maximum values of speed to provide comparable results.
ISO IEC 9899 specifies test methods for determining the maximum speed of electrically powered wheelchairs, including scooters, intended to carry one person with a maximum nominal speed not exceeding 15 km/h (4,167 rn/s) on a level surface.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 7176-11, Wheelchairs — Part ii: Test dummies
ISO 7176-13, Wheelchairs — Part 13: Determniiiation of coefficient offriction of test surfaces
ISO 7176-15, Wheelchairs — Part 15: Requirements for infor,nation disclosure, documentation and labelling
ISO 7176-22, Wheelchairs — Part 22: Set-up procedures
3 Terms and definitions
No terms and definitions are listed in ISO IEC 9899.
4.4 Test dummy, as specified in ISO 7176-11, or a human test occupant according to ISO 7 176-22.
Mass added to the wheelchair for the purposes of control or instrumentation should not significantly affect the overall mass distribution of the wheelchair. The overall mass of the loaded wheelchair shall be adjusted to compensate for any such added mass.
4.5 Supplementary weight, shall be added to a human test driver to give the mass distribution equivalent to the relevant dummy.
5 Preparation of the test wheelchair
Prepare the test wheelchair as follows before commencing the sequence of tests.
a) Set up the wheelchair as specified in ISO 7 176-22.
b) Set any controls which are accessible to the user without special tools and which influence the maximum speed to provide a maximum value.
NOTE These controls include programmable controls, touch pads, computer interfaces, etc.
c) If a dummy is used, a remote controller may be used to operate the wheelchair controls. This may be done by a telemetry system, by an operator running alongside or by other similar means.
WARNING — This testing is potentially hazardous to a human test driver and test personnel. Appropriate safety precautions should be taken to avoid injury. Any additional weights should be firmly secured.
a) Ensure that the electrical driving system reaches a temperature typical of working conditions by driving the wheelchair for a distance of approximately 1,5 km.
b) Within 5 mm of completing a), place the wheelchair on the horizontal test plane.
c) Drive the wheelchair forwards in a straight line on the horizontal test plane with its control device set to full speed command ensuring that it achieves its maximum speed.
d) Measure the maximum speed achieved with the means specified in 4.3 and record this value,
Vm, Ifl IT1/S.
e) Repeat a) to d) for an additional two runs.
1) Determine and record the value of the arithmetic mean, Vjnm, of the three values of Vm measured in d)ande).
g) Repeat a) to f) but driving with the wheelchair travelling in reverse.
Align the castor orientations for this test to maintain a straight line of travel if necessary.
the wheelchair type and any serial and batch numbers;
the total mass of the dummy used or, if a person is used, the mass of the driver and weights; NOTE The dummy mass includes the mass of any instrumentation attached to the dummy.
g) details of the set-up of the wheelchair as specified in Iso 7176-22;
h) a photograph of the wheelchair equipped as during the test;
i) the result of the test specified in Clause 6. Table 1 provides a recommended format for disclosure.
8 Disclosure
The following result shall be disclosed in the manufacturer’s specification sheets within the format specified in ISO 7176-1 5:
maximum speed, forwards on horizontal: ……….km/h
NOTE Units of measurement are different from m/s used in the test report (Clausel).