The Experts below are selected from a list of 156 Experts worldwide ranked by ideXlab platform
Chihhong Chang - One of the best experts on this subject based on the ideXlab platform.
-
the effect of valve Handwheel type operating plane and grasping posture on peak torque strength of young men and women
Human Factors, 1997Co-Authors: Yuhchua Shih, Maojiu J Wang, Chihhong ChangAbstract:An experiment was designed to assess the factors affecting the operation of valve Handwheels. Forty volunteers (20 men and 20 women) participated in this study. A nested-factorial experimental design was employed. Handwheel type (smooth, curved, or knurled rim), operating plane (sagittal, frontal, or transverse plane), grasping posture (power or precision grasp), and operating direction (clockwise or counterclockwise) were found to have significant effects on the (maximum volitional torque exertion [MVTE]). A power grasp exerted more force than did a precision grasp. A smooth-rim Handwheel oriented in the frontal plane resulted in the least MVTE. Counterclockwise torque exertion was significantly greater than clockwise torque exertion, but the difference was not very large. MVTE for women (7.9 Nm) was about 66% of that for men (12.0 Nm).
Fereydou Aghazadeh - One of the best experts on this subject based on the ideXlab platform.
-
the effects of valve Handwheel height and angle on neck shoulder and back muscle loading
International Journal of Industrial Ergonomics, 2018Co-Authors: Saif Alqaisi, Fereydou AghazadehAbstract:Abstract The objectives of this research were to: (1) investigate the effects of Handwheel height and angle of a valve on the muscle loading of shoulder, neck, and back muscles; and (2) identify a Handwheel height and angle that best distributes the load of torque exertions to different muscles. Fifteen healthy male participants were recruited for this study. The Handwheel heights included knee, elbow, shoulder, and overhead levels. The Handwheel angles included 0°, 45°, and 90°. At each height-angle combination, participants performed an isometric torque exertion on a Handwheel. During each trial, the maximum electromyography (EMG) activities were measured from the right and left anterior deltoids, trapezii, latissimi dorsi, and erector spinae muscles. EMG data were normalized and reported as percentages of reference contractions (RC). A two factor split-plot analysis of variance (ANOVA) and Tukey multiple pairwise comparison tests were performed to determine the significant effects. Results show that a Handwheel at overhead 45°, which allows the greatest torque production, is associated with a concentrated load on the right anterior deltoid (94.1 %RC). At elbow level, participants were exposed to low loads on the shoulder and neck muscles, but that was compensated with higher loads on the back muscles. Based on the EMG results, the best Handwheel height and angle appeared to be at shoulder 0°. At this height and angle, seven of the eight muscles were working at or close to their lowest EMG activities, while also allowing the production of relatively large torques (65.2 Nm).
-
Valve Operation: Evaluation of Handwheel Actuation Techniques in Terms of Muscle Loading, Perceived Comfort, and Efficiency
2016Co-Authors: Fereydou Aghazadeh, Saif Al Qaisi, Laura Ikuma, Francis HutchinsoAbstract:The purpose of this study was to introduce an innovative design of a valve wrench and compare it to conven-tional tools/methods of Handwheel actuation. Four methods of Handwheel actuation were evaluated, includ-ing using bare hands, regular wrench-restricted (assumes the presence of obstructions), regular wrench-unrestricted (assumes no obstructions), and modified wrench. These methods were tested on a medium-sized gate valve at two torque settings (25 Nm and 50 Nm). The methods were compared to each other, in terms of efficiency (speed), subjective ratings of perceived exertion (Borg ratings), and electromyography (EMG) activity of the left bicep and right medial deltoid. The least efficient technique at both torques was the regu-lar wrench-restricted, and the most efficient technique was the modified wrench. At 25 Nm, the modified wrench was optimal, in that it was the most efficient and had moderately low EMG activity and Borg rat-ings. At 50 Nm, the regular wrench-unrestricted seemed to be the best method, having the lowest EMG ac-tivity and Borg ratings. In contrast, the bare hands technique had the highest EMG activity
-
effect of Handwheel height and angle on operators torque production capabilities
IIE Transactions on Occupational Ergonomics and Human Factors, 2015Co-Authors: Saif Alqaisi, Fereydou Aghazadeh, Laura H IkumaAbstract:OCCUPATIONAL APPLICATIONSFrom investigating the maximum isometric torque exertions of participants on a Handwheel set at different heights and angles, it was determined that torque production capability is greatest when the Handwheel is set overhead at 45° and is lowest when overhead at 0°. The mean torque production capacity of the participants was substantially lower than the torque demands in the field and in existing standards. Therefore, maximum recommended torque that accommodates the strength of most of the male population was determined for each Handwheel height and angle investigated. The findings of this study may be useful for forming guidelines for Handwheel-valve system designs, such as in standardizing the height and angle of a Handwheel and defining a maximum recommended torque for Handwheel-valve systems.TECHNICAL ABSTRACT Background: Handwheel-valve operation is a common task in many workplaces, including power, chemical, water, and oil industries. Handwheels of various angles and heights...
-
valve operation evaluation of Handwheel actuation techniques in terms of muscle loading perceived comfort and efficiency
Proceedings of the Human Factors and Ergonomics Society Annual Meeting, 2012Co-Authors: Fereydou Aghazadeh, Saif Alqaisi, Laura H Ikuma, Francis HutchinsoAbstract:The purpose of this study was to introduce an innovative design of a valve wrench and compare it to conventional tools/methods of Handwheel actuation. Four methods of Handwheel actuation were evaluated, including using bare hands, regular wrench-restricted (assumes the presence of obstructions), regular wrench-unrestricted (assumes no obstructions), and modified wrench. These methods were tested on a medium-sized gate valve at two torque settings (25 Nm and 50 Nm). The methods were compared to each other, in terms of efficiency (speed), subjective ratings of perceived exertion (Borg ratings), and electromyography (EMG) activity of the left bicep and right medial deltoid. The least efficient technique at both torques was the regular wrench-restricted, and the most efficient technique was the modified wrench. At 25 Nm, the modified wrench was optimal, in that it was the most efficient and had moderately low EMG activity and Borg ratings. At 50 Nm, the regular wrench-unrestricted seemed to be the best method...
-
Handwheel valve operation assessment of four opening methods in terms of muscle loading perceived comfort and efficiency
Work-a Journal of Prevention Assessment & Rehabilitation, 2012Co-Authors: Fereydou Aghazadeh, Saif Al Qaisi, Francis Hutchinso, Laura H IkumaAbstract:Injuries due to manual valve Handwheel operations are a major concern in the chemical process industry. Manual valves are used to start, stop, and control flow in process lines. The torque required to operate Handwheels after the initial "breaking" can vary due to the size, design, and condition of the valve. This study tested four methods of turning the Handwheel on a medium-sized gate valve at two different torque requirements (25 Nm and 50 Nm). The methods were compared to each other, in terms of efficiency, subjective ratings of perceived exertion, and electromyography activity of the upper extremity and trunk muscles. The results indicate that different methods and torque requirements are compensated for by the use of different muscles. Also, this use of different muscles, along with the increased mechanical advantage of the wrench, can affect the operator's actual and perceived comfort and efficiency while operating a valve Handwheel.
Yuhchua Shih - One of the best experts on this subject based on the ideXlab platform.
-
the effect of valve Handwheel type operating plane and grasping posture on peak torque strength of young men and women
Human Factors, 1997Co-Authors: Yuhchua Shih, Maojiu J Wang, Chihhong ChangAbstract:An experiment was designed to assess the factors affecting the operation of valve Handwheels. Forty volunteers (20 men and 20 women) participated in this study. A nested-factorial experimental design was employed. Handwheel type (smooth, curved, or knurled rim), operating plane (sagittal, frontal, or transverse plane), grasping posture (power or precision grasp), and operating direction (clockwise or counterclockwise) were found to have significant effects on the (maximum volitional torque exertion [MVTE]). A power grasp exerted more force than did a precision grasp. A smooth-rim Handwheel oriented in the frontal plane resulted in the least MVTE. Counterclockwise torque exertion was significantly greater than clockwise torque exertion, but the difference was not very large. MVTE for women (7.9 Nm) was about 66% of that for men (12.0 Nm).
Laura H Ikuma - One of the best experts on this subject based on the ideXlab platform.
-
effect of Handwheel height and angle on operators torque production capabilities
IIE Transactions on Occupational Ergonomics and Human Factors, 2015Co-Authors: Saif Alqaisi, Fereydou Aghazadeh, Laura H IkumaAbstract:OCCUPATIONAL APPLICATIONSFrom investigating the maximum isometric torque exertions of participants on a Handwheel set at different heights and angles, it was determined that torque production capability is greatest when the Handwheel is set overhead at 45° and is lowest when overhead at 0°. The mean torque production capacity of the participants was substantially lower than the torque demands in the field and in existing standards. Therefore, maximum recommended torque that accommodates the strength of most of the male population was determined for each Handwheel height and angle investigated. The findings of this study may be useful for forming guidelines for Handwheel-valve system designs, such as in standardizing the height and angle of a Handwheel and defining a maximum recommended torque for Handwheel-valve systems.TECHNICAL ABSTRACT Background: Handwheel-valve operation is a common task in many workplaces, including power, chemical, water, and oil industries. Handwheels of various angles and heights...
-
valve operation evaluation of Handwheel actuation techniques in terms of muscle loading perceived comfort and efficiency
Proceedings of the Human Factors and Ergonomics Society Annual Meeting, 2012Co-Authors: Fereydou Aghazadeh, Saif Alqaisi, Laura H Ikuma, Francis HutchinsoAbstract:The purpose of this study was to introduce an innovative design of a valve wrench and compare it to conventional tools/methods of Handwheel actuation. Four methods of Handwheel actuation were evaluated, including using bare hands, regular wrench-restricted (assumes the presence of obstructions), regular wrench-unrestricted (assumes no obstructions), and modified wrench. These methods were tested on a medium-sized gate valve at two torque settings (25 Nm and 50 Nm). The methods were compared to each other, in terms of efficiency (speed), subjective ratings of perceived exertion (Borg ratings), and electromyography (EMG) activity of the left bicep and right medial deltoid. The least efficient technique at both torques was the regular wrench-restricted, and the most efficient technique was the modified wrench. At 25 Nm, the modified wrench was optimal, in that it was the most efficient and had moderately low EMG activity and Borg ratings. At 50 Nm, the regular wrench-unrestricted seemed to be the best method...
-
Handwheel valve operation assessment of four opening methods in terms of muscle loading perceived comfort and efficiency
Work-a Journal of Prevention Assessment & Rehabilitation, 2012Co-Authors: Fereydou Aghazadeh, Saif Al Qaisi, Francis Hutchinso, Laura H IkumaAbstract:Injuries due to manual valve Handwheel operations are a major concern in the chemical process industry. Manual valves are used to start, stop, and control flow in process lines. The torque required to operate Handwheels after the initial "breaking" can vary due to the size, design, and condition of the valve. This study tested four methods of turning the Handwheel on a medium-sized gate valve at two different torque requirements (25 Nm and 50 Nm). The methods were compared to each other, in terms of efficiency, subjective ratings of perceived exertion, and electromyography activity of the upper extremity and trunk muscles. The results indicate that different methods and torque requirements are compensated for by the use of different muscles. Also, this use of different muscles, along with the increased mechanical advantage of the wrench, can affect the operator's actual and perceived comfort and efficiency while operating a valve Handwheel.
Kamel Messaoudene - One of the best experts on this subject based on the ideXlab platform.
-
Innovative Brake Handwheel Concept for Paraplegic Drivers
IEEE Transactions on Vehicular Technology, 2010Co-Authors: Kamel Messaoudene, Naima Ait Oufroukh, Said MammarAbstract:With the desire bring more comfort and safety to disabled drivers, new technologies have been deemed appropriate for the development of innovative driving assistance. This paper describes the possibility of integrating these technologies for the development of a positive interacting system with disabled drivers. In this context, we suggest a new solution for a braking device that aims at helping paraplegic drivers: Integrated in a steer-by-wire Handwheel, the driver has only to press on the Handwheel to brake the vehicle. The device is equipped with automatic releasing of the Handwheel movement when braking is no longer required. The proposed solution brings many advantages in terms of safety and ergonomics. Indeed, this device will enable the driver to brake and to accelerate while continuously keeping the hands on the Handwheel. This gives the driver a significant gain in braking time. The use of an active braking feedback also provides a progressive and intuitive proportioning brake. This concept opens prospects to active braking assistance. To concretize this idea, theoretical and simulation studies are carried out for the main processes of the device. A prototype has also been developed.
-
driving assistance for paraplegic people brake on Handwheel coupled to the steering by wire system
IFAC Proceedings Volumes, 2007Co-Authors: Kamel Messaoudene, Naima Ai Oufroukh, Said MammaAbstract:Abstract This paper deals with a new solution for driving assistance, dedicated to the paraplegic people. This one consists to the development of a new braking device, coupled to the steering-by-wire system. This work represents a part of activities of a competitiveness pole in France, named MOVEO; it deals with the problematic of the Handicap and Mobility. The originality of this device is in the braking tool, which is the Handwheel. The braking action is obtained by exerting a press force on the Handwheel. For safety reasons, the movement of the Handwheel will be released only when we actuate a braking start module using the inches. This device will allow the driver to brake and to accelerate while keeping the hands on the Handwheel; this offers the advantage of an important gain in braking time and driving will become more flexible and more comfortable. A modeling of the dynamic's behavior of the driver bust was carried out, and a study on the operation mode and the applications of the x-by-wire technology in the automotive and its steering system.
