توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱USING A STAND ALONE MODEL TO INVESTIGATE KNOCK CRITERION IN AN SI GAS ENGINE FUELED WITH METHANE
نویسنده(ها): ، ،
اطلاعات انتشار: پانزدهمین کنفرانس سالانه مهندسی مکانیک، سال
تعداد صفحات: ۸
Natural Gas has been widely considered as an alternative fuel for internal combustion, since it is a major source of fuel after crude oil products and is capable to meet low emission standards specially CO2. In this paper combustion phenomenon of natural gas in from of methane is studied in detail.
Knock limits compression ratio and spark timing in SI engines; that would directly affects the thermal efficiency and output power and may be the cause of mechanical damage in engine.
In this paper, a two zone thermodynamic model is developed using a chemical kinetics mechanism with 20 reactions and 15 chemical species for methane combustion. It is assumed that the flame, with adiabatic temperature is in equilibrium stage. The unburned zone is considered extensively to analyze the conditions that lead to knock. The “Knock Criterion” has been used to forecast the knock intensity. The influence of engine parameters such as spark advance, compression ratio and relative humidity of air intake is studied on knock phenomenon. The experimental engine results from reference works are used to validate the accuracy of our model.<\div>

۲A Biofeedback System for Prevention and Correction of Cervicothoracic Spine Posture Abnormality with Active Ergonomics Considerations
نویسنده(ها): ، ،
اطلاعات انتشار: نخستین کنفرانس بین المللی ارگونومی ایران، سال
تعداد صفحات: ۷
Incorrect anatomic habits cause incorrect anatomic postures which take long time to get corrected with ordinary methods, also to prevent, there are methods based on ergonomics. The method which we devised is based on biofeedback method with ergonomic considerations. Up to now the ergonomic designs have been according to biomechanical statistical data which can be unsuitable for those whose biomechanical data has great deviation from mean state, but our mobile device uses individual biomechanical data, detected from target limbs. In this paper first the principles and real–time the architecture of the project is defined and explained, then sensory and optimization phase will be stated and finally the project’s results and future will be discussed.<\div>

۳The Effects of Segmentation in Above Knee Prosthesis during the Swing Phase
نویسنده(ها): ، ،
اطلاعات انتشار: نوزدهمین همایش سالانه مهندسی مکانیک، سال
تعداد صفحات: ۴
In this paper after a brief review on previous studies on above knee prosthesis design, SEP prosthesis which has recently introduced considered. This prosthesis has modeled with fixed and moving ankle separately during the swing phase of walking and the optimized physical parameters have been discussed. Here it is tried to compare the results of these models and survey the effects of the improvement of segmentation in behavior and the resulted optimized parameters of the models. The comparison of models in the amount and the pattern of actuation torque, damping torque and inertial effects represent that, this improvement in segmentation results in reduction in the amount of all of the considered physical parameters which is appreciated.<\div>

۴An Investigation on Ground Reaction Force During Biped NormalWalking
اطلاعات انتشار: نوزدهمین همایش سالانه مهندسی مکانیک، سال
تعداد صفحات: ۴
In this paper after reviewing the history of biomechanical researches on biped movement, in order to achieve a deep insight on the structure and biomechanics of human body, capability of proposed simple models in predicting ground reaction force (GRF) pattern has been investigated and finally an optimized inverted double pendulum with compliant joints is suggested. The results for GRF pattern during single stance phase for this model were incredibly satisfactory. Beside the great potentials of inverted double pendulum with compliant joints model in explaining the double peak appearance of vertical GRF, it also follows well the kinematical behavior of human leg during single stance phase. These results can be applied vastly in optimizing biped robots and also can be used in other fields like biomechanics, kinesiology and rehabilitation technology.<\div>

۵Warehousebot, an Automated Material Handling Machine
نویسنده(ها): ، ،
اطلاعات انتشار: دوازدهمین کنفرانس ملی مهندسی ساخت و تولید ایران، سال
تعداد صفحات: ۶
In present study an AGV mobile robot as a warehouse robot for scientific and vocational studies in industrial robotics labs is introduced. This robot is able to manage materials and finished products in an industrial zone. Warehousebot applications are defined in lab scale but the resulted experiences, especially in controlling methods via attention control can be easily developed to factories and automated material handling systems. Application of holonomic locomotion system, inertial navigation system and attention based control has caused great enhancement in the robot efficiency.<\div>
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