2007 conferences and submitted paper for journal
ICSV14: A survey on noise and vibration discomfort
QUESTIONNAIRE-BASED SURVEY ON DRIVERS’ NOISE AND VIBRATION DISCOMFORT
Mohd Jailani Mohd Nor, Baba Md Deros and Dian Darina Indah Daruis
Department of Mechanical and Materials Engineering, Faculty of Engineering, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
Abstract
A questionnaire-based survey was conducted to gather information regarding driving discomfort of Malaysian passengers’ vehicle drivers. The discomfort factors investigated were noise and vibration in the vehicle both during idle and accelerating conditions. In the final survey, there were 63 subjects. It was found that 37% voted for engine noise during idle as compared to 32% for engine noise during accelerating. Men were found to experience less discomfort than women drivers in most of the driving conditions investigated. At the same time, age difference showed a different trend of response.
Keywords: Noise, vibration, driving, discomfort, survey, questionnaire,
NVC2007: Variation of whole body vibration in passenger cars
VARIATION OF WHOLE-BODY VIBRATION IN PASSENGER CARS
Dian Darina Indah Daruis, Mohd Jailani Mohd Nor and
Muhammad Hosseini Fouladi
Department of Mechanical and Materials Engineering
Faculty of Engineering
Universiti Kebangsaan Malaysia
ABSTRACT
This paper is the continuation from a previous study which evaluated vibration characteristics of a sedan car. The previous study measured vibration signals on-the-road while driving with different speeds over five road surfaces. This study will evaluate the same vibration characteristics of a lower end car which is categorized as compact car. The variation of the two cars will be compared. The evaluation method is based on British Standard BS 6841 (1987), involving the application of frequency weightings Wb, calculation of weighted root-mean-square acceleration or the component ride value and the calculation of estimated as well as the true vibration dose values. Initial study showed that vibration dose values increases as the speed rises. Rough road surfaces have higher vibration dose values than smooth road surfaces. On the same road, the weighted values of all the vertical axes vary by about two to one between the 2.0cc sedan and the 1.3 compact cars, and about two to one difference between values of smooth road surfaces and the values obtained on poor road surfaces.
Keywords: vibration evaluation, ride comfort,
ICE2007: Anthropometric study on Malaysian military cadets
Anthropometric study of Malaysian military cadets
Dian Darina Indah Daruis*, Baba Md Deros and Mohd Jailani Mohd Nor
Department of Mechanical and Materials Engineering
Faculty of Engineering
Universiti Kebangsaan Malaysia
* dian@vlsi.eng.ukm.my
Abstract
An anthropometrics study of Malaysian military cadets at Universiti Pertahanan Nasional Malaysia or National Defense University (NDU) was carried out. In the anthropometrics study, thirty-six human body dimensions were measured by using conventional measuring method. Later, the data collected were used in calculating the mean, percentiles, standard deviations and correlation coefficients of the Malaysian military cadets’ population in NDU. It was found from the study that both stature and weight significantly correlated with many of the body dimensions measured. Having done that, the Malaysian military cadets’ anthropometrics data were compared to anthropometrics data of civilian population in the developed countries. The authors found that Malaysian military cadets are significantly shorter and lighter especially for the 95th percentiles. On the other hand, when the data was compared to the data of civilian population in Malaysia measured by previous researchers in Malaysia, it was found that the differences in the thirty-six human body dimensions were not statistically significant except the weight.
Keyword: anthropometry, Malaysian, anthropometric data, body dimensions
ICE2007: Driving discomfort survey caused by car seat
Driving Discomfort Survey Caused by Car Seat
*Dian Darina Indah Daruis, Baba Md Deros and Jailani Mohd Noor
Department of Mechanical and Materials Engineering
Faculty of Engineering
Universiti Kebangsaan Malaysia
dian@vlsi.eng.ukm.my
Abstract
An online-based questionnaire survey was conducted to gather information regarding driving discomfort of Malaysian passengers’ vehicle driver. Forty subjects responded to the survey. The discomfort factor investigated in this on-line survey was on the driver’s seat discomfort. From the standard Nordic body diagram, it was found that 60% of the respondents had experienced discomfort or pain at the back; 56% discomfort or pain at the neck; and 44% discomfort or pain at the low back. In addition, the response for degree of discomfort on fourteen body parts showed that more than 30% of the respondents had experienced slight discomfort on their hands and wrist, lower legs, upper and lower back, shoulders, ankles and feet. Meanwhile, more than 20% of the respondents believed that their seats had caused them a lot of discomfort at their lower back, neck, hand and wrist. The survey response had also showed that more than 30% of the respondents felt their seat backrest contour and seat pan contour are inadequate, and more than 20% felt the backrest height and the neck rest are inadequate. In contrary, only 17% of the respondents felt their seat backrest height is too much. More than 14% felt that armrest and neck rest are improperly located. About 56% of the respondents had the opinion that the main problem in their seating systems are due to improper seat contour/shape and armrest and neck rest, and 46% are due to reach and legroom. This survey result is in-line with the findings from the literatures and men drivers were found to experience less discomfort compared to women drivers.
Keywords: car seat, discomfort, survey
Submitted to IE Journal: A Survey on Driving Discomfort caused by Noise, Vibration and Car Seat
A Survey on Driving Discomfort Caused by Noise, Vibration and Car Seat
*Dian Darina Indah Daruis, Baba Md Deros and Mohd Jailani Mohd Noor
Department of Mechanical and Materials Engineering
Faculty of Engineering
Universiti Kebangsaan Malaysia
dian@vlsi.eng.ukm.my
Abstract
A questionnaire-based survey was conducted to gather information regarding driving discomfort of Malaysian passengers’ vehicle driver. The discomfort factors investigated were particularly on noise, vibration and car seat. The survey was divided into two main sections; noise and vibration and seat system. In the final survey, there were only 40 responses that could be analyzed. For the noise and vibration, it was found that 36% voted for engine noise during idle as the source of discomfort whereas only 31% voted for engine noise during accelerating. From the standard Nordic body diagram, it was found that 60% of the forty responses had experienced discomfort or pain at the back; 56% discomfort or pain at the neck; and 44% discomfort or pain at the low back. In addition, the response for degree of discomfort on fourteen body parts showed that more than 30% of the respondents had experienced slight discomfort on their hands and wrist, lower legs, upper and lower back, shoulders, ankles and feet. Meanwhile, more than 20% of the respondents believed that their seats had caused them a lot of discomfort at their lower back, neck, hand and wrist. This survey result is in-line with the findings from the literatures and men drivers were found to experience less discomfort compared to women drivers.
Relevance to industry
Subjective evaluation methods apart from objective evaluation methods are very much relevant to vehicle development process. A survey is a common step in the preliminary stage of the process. This study provides new findings to automotive industries as the respondents may represent the Asian car users especially from South East Asia.
Keywords: Noise; Vibration; Car seat; Discomfort; Survey
QUESTIONNAIRE-BASED SURVEY ON DRIVERS’ NOISE AND VIBRATION DISCOMFORT
Mohd Jailani Mohd Nor, Baba Md Deros and Dian Darina Indah Daruis
Department of Mechanical and Materials Engineering, Faculty of Engineering, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
Abstract
A questionnaire-based survey was conducted to gather information regarding driving discomfort of Malaysian passengers’ vehicle drivers. The discomfort factors investigated were noise and vibration in the vehicle both during idle and accelerating conditions. In the final survey, there were 63 subjects. It was found that 37% voted for engine noise during idle as compared to 32% for engine noise during accelerating. Men were found to experience less discomfort than women drivers in most of the driving conditions investigated. At the same time, age difference showed a different trend of response.
Keywords: Noise, vibration, driving, discomfort, survey, questionnaire,
NVC2007: Variation of whole body vibration in passenger cars
VARIATION OF WHOLE-BODY VIBRATION IN PASSENGER CARS
Dian Darina Indah Daruis, Mohd Jailani Mohd Nor and
Muhammad Hosseini Fouladi
Department of Mechanical and Materials Engineering
Faculty of Engineering
Universiti Kebangsaan Malaysia
ABSTRACT
This paper is the continuation from a previous study which evaluated vibration characteristics of a sedan car. The previous study measured vibration signals on-the-road while driving with different speeds over five road surfaces. This study will evaluate the same vibration characteristics of a lower end car which is categorized as compact car. The variation of the two cars will be compared. The evaluation method is based on British Standard BS 6841 (1987), involving the application of frequency weightings Wb, calculation of weighted root-mean-square acceleration or the component ride value and the calculation of estimated as well as the true vibration dose values. Initial study showed that vibration dose values increases as the speed rises. Rough road surfaces have higher vibration dose values than smooth road surfaces. On the same road, the weighted values of all the vertical axes vary by about two to one between the 2.0cc sedan and the 1.3 compact cars, and about two to one difference between values of smooth road surfaces and the values obtained on poor road surfaces.
Keywords: vibration evaluation, ride comfort,
ICE2007: Anthropometric study on Malaysian military cadets
Anthropometric study of Malaysian military cadets
Dian Darina Indah Daruis*, Baba Md Deros and Mohd Jailani Mohd Nor
Department of Mechanical and Materials Engineering
Faculty of Engineering
Universiti Kebangsaan Malaysia
* dian@vlsi.eng.ukm.my
Abstract
An anthropometrics study of Malaysian military cadets at Universiti Pertahanan Nasional Malaysia or National Defense University (NDU) was carried out. In the anthropometrics study, thirty-six human body dimensions were measured by using conventional measuring method. Later, the data collected were used in calculating the mean, percentiles, standard deviations and correlation coefficients of the Malaysian military cadets’ population in NDU. It was found from the study that both stature and weight significantly correlated with many of the body dimensions measured. Having done that, the Malaysian military cadets’ anthropometrics data were compared to anthropometrics data of civilian population in the developed countries. The authors found that Malaysian military cadets are significantly shorter and lighter especially for the 95th percentiles. On the other hand, when the data was compared to the data of civilian population in Malaysia measured by previous researchers in Malaysia, it was found that the differences in the thirty-six human body dimensions were not statistically significant except the weight.
Keyword: anthropometry, Malaysian, anthropometric data, body dimensions
ICE2007: Driving discomfort survey caused by car seat
Driving Discomfort Survey Caused by Car Seat
*Dian Darina Indah Daruis, Baba Md Deros and Jailani Mohd Noor
Department of Mechanical and Materials Engineering
Faculty of Engineering
Universiti Kebangsaan Malaysia
dian@vlsi.eng.ukm.my
Abstract
An online-based questionnaire survey was conducted to gather information regarding driving discomfort of Malaysian passengers’ vehicle driver. Forty subjects responded to the survey. The discomfort factor investigated in this on-line survey was on the driver’s seat discomfort. From the standard Nordic body diagram, it was found that 60% of the respondents had experienced discomfort or pain at the back; 56% discomfort or pain at the neck; and 44% discomfort or pain at the low back. In addition, the response for degree of discomfort on fourteen body parts showed that more than 30% of the respondents had experienced slight discomfort on their hands and wrist, lower legs, upper and lower back, shoulders, ankles and feet. Meanwhile, more than 20% of the respondents believed that their seats had caused them a lot of discomfort at their lower back, neck, hand and wrist. The survey response had also showed that more than 30% of the respondents felt their seat backrest contour and seat pan contour are inadequate, and more than 20% felt the backrest height and the neck rest are inadequate. In contrary, only 17% of the respondents felt their seat backrest height is too much. More than 14% felt that armrest and neck rest are improperly located. About 56% of the respondents had the opinion that the main problem in their seating systems are due to improper seat contour/shape and armrest and neck rest, and 46% are due to reach and legroom. This survey result is in-line with the findings from the literatures and men drivers were found to experience less discomfort compared to women drivers.
Keywords: car seat, discomfort, survey
Submitted to IE Journal: A Survey on Driving Discomfort caused by Noise, Vibration and Car Seat
A Survey on Driving Discomfort Caused by Noise, Vibration and Car Seat
*Dian Darina Indah Daruis, Baba Md Deros and Mohd Jailani Mohd Noor
Department of Mechanical and Materials Engineering
Faculty of Engineering
Universiti Kebangsaan Malaysia
dian@vlsi.eng.ukm.my
Abstract
A questionnaire-based survey was conducted to gather information regarding driving discomfort of Malaysian passengers’ vehicle driver. The discomfort factors investigated were particularly on noise, vibration and car seat. The survey was divided into two main sections; noise and vibration and seat system. In the final survey, there were only 40 responses that could be analyzed. For the noise and vibration, it was found that 36% voted for engine noise during idle as the source of discomfort whereas only 31% voted for engine noise during accelerating. From the standard Nordic body diagram, it was found that 60% of the forty responses had experienced discomfort or pain at the back; 56% discomfort or pain at the neck; and 44% discomfort or pain at the low back. In addition, the response for degree of discomfort on fourteen body parts showed that more than 30% of the respondents had experienced slight discomfort on their hands and wrist, lower legs, upper and lower back, shoulders, ankles and feet. Meanwhile, more than 20% of the respondents believed that their seats had caused them a lot of discomfort at their lower back, neck, hand and wrist. This survey result is in-line with the findings from the literatures and men drivers were found to experience less discomfort compared to women drivers.
Relevance to industry
Subjective evaluation methods apart from objective evaluation methods are very much relevant to vehicle development process. A survey is a common step in the preliminary stage of the process. This study provides new findings to automotive industries as the respondents may represent the Asian car users especially from South East Asia.
Keywords: Noise; Vibration; Car seat; Discomfort; Survey
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