RAMSIS Electronic Belt Fit Test Device (eBTD)

Transport Canada, an institution assigned to the Canadian Transport Ministry, has developed a device based on the SAE H-Point measuring machine (SAE J826). The device enables the belt run of safety belts in vehicles to be analysed and evaluated for the addressing of safety issues. In future, positive tests conducted by means of this device will form an integral part of vehicle registration requirements for the Canadian market.

RAMSIS Electronic Belt Test DeviceConstituent parts of Belt Fit Test (BTD) itself are the simulation of the torso and hips of a human being. These are applied exactly to an SAE H-Point measuring machine. The dimensions of the torso and hips represent 50% of an adult Canadian and have been scaled on the collar bone, the hip area and the sternum.  When the BTD is positioned in a vehicle, the exact belt run can be acquired by means of the scaling. The result can be subsequently compared to a series of fit criteria, which have been previously defined, to minimize the risk of serious belt injuries in case of a collision. If tests carried out with the Belt Fit Test produce a negative result, i.e. the belt does not run within the given scaling and therefore outwith the safety values, the vehicle fails the test and will not be permitted on Canadian roads. Adherence to Transport Canada's stipulations in this respect will shortly be a legal requirement for the licensing of passenger cars in Canada.

In cooperation with the Joint Working Group Abdominal Injury Reduction (a consortium consisting of various car manufacturers), Human Solutions has developed a digital certification tool that enables manufacturers to comply with Belt Fit Test regulations as early as the development phase. The tool is called the Electronic Belt Fit Test Device and performs its calculations based on manufacturers' CAD data. Thanks to the eBTD module, an exact CAD description of the physical BTD in the CAD environment can be loaded and positioned. The user selects the pertinent belt anchorage from a predefined catalog and defines the free parameters (position, kinematics). The run of the belt over the torso and the hip area of the electronic Belt Fit Test is subsequently calculated with belt width and the kinematics of the belt anchorages taken fully into account.

After numerous validation study projects had been carried out, the simulation of belt run with the eBTD was accepted and approved as the official certification method by Transport Canada.

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