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Tacitle displays as a medium to communicate with the driver
2000 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Warning signals as visual displays have traditionally been utilised to convey information to the human operator in most man-machine systems. In many situations this modality has reached full capacity or has become overloaded. To deal with the overload problem, information displays are being investigated which utilise sensory modalities other than vision. Tactile displays are believed to be the next generation’s human system interface. The main objective of this study is to evaluate tactile display as a medium to communicate with the driver through the seat in comparison to auditory- and visual- displays. The project was based on a literature study on human factor considerations in warning systems, as well as the physiological factors related to vibrations and other tactile display solutions. The specific aim is to get an initial understanding on whether tactile warnings are possible to implement in the drivers seat and how they may work. Both an objective evaluation (e.g. reaction times) and a subjective evaluation (e.g. impressions and acceptance) were done. The tactile display consists of vibrators that are mounted into the drivers seat. The tactile warning is compared with audio-visual warning through two separate tests in a driving simulator. Each test person drives two different roads (scenarios) for ten minutes each, one with each warning medium. The warnings are used to warn for forward collision situations and lane departure situations. After the simulator drive a controlled break reaction test (BRT) is performed, where single reaction times are measured. Data from three different reaction time situations are analysed. The situations analysed are: the controlled BRT, the BRT for forward collision warning and the steering wheel RT for lane departure warning. The results shows that even though the test persons tend to react a little faster with the audio-visual warning than with the tactile warning, there is no statistically significant difference between the two warnings mediums or even between the genders. These strongly suggest that the tactile display is equally good with the audio-visual when it comes to reaction times. In future experiments it would be interesting to see if the RT is shorter if the tactile is integrated with the visual. The result of the subjective evaluation is equally of great importance and interest. The test persons overall impression of the tactile display is good and could be summarized with the comment: “the tactile display speaks a lot without disturbing”. The test persons appreciate that the tactile display is discrete and personal. Another positive reaction is that the vibrotactile display is felt as logical since it vibrates in different parts of the seat depending on where the obstacle is and what it wants to warn the person for. Compared to the audio-visual warning for lane departure the tactile display is the preferred warning medium. For the forward collision the vibrotactile warning could be more obvious. Raising the intensity and change the placement of the vibrators could do this. A big majority of the test persons (85%) could imagine having a vibrotactile warning in the car in the future. In general though, the tactile display is still unfamiliar to drivers and requires some practice. Other benefits can likewise be explored as suggested in this study, such as using tactile seat for alerting drowsy-drivers and for back up warnings in the future.

Place, publisher, year, edition, pages
Keyword [en]
Technology, tactile, warning signals, vibrations, warning medium, human-machine interaction, vehicle control, human factors
Keyword [sv]
URN: urn:nbn:se:ltu:diva-57232ISRN: LTU-EX--00/342--SELocal ID: deaab2f8-a47c-4017-94a7-835e9ef72146OAI: diva2:1030619
Subject / course
Student thesis, at least 30 credits
Educational program
Industrial Engineering and Ergonomics, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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