-
حرية الوصول المقاله
1 - تبیین گردشگری حلال با توجه به آیات قرآنی
میرزا حسن حسینی سحر خاوری مسلم سلیمان پورمسأله حلال در بیش‌تر صنایع امروزی از قبیل مواد غذایی، مواد آرایشی، حمل و نقل و غیره نفوذ کرده است. صنعت گردشگری نیز می‌تواند با رعایت پاره‌ای از قوانین شرعی اسلام بازار بزرگ مسلمانان جهان را جذب کند. پس از حوادث یازدهم سپتامبر و مسائل ناشی از آن بیش‌تر مسلمانان دنیا گرا أکثرمسأله حلال در بیش‌تر صنایع امروزی از قبیل مواد غذایی، مواد آرایشی، حمل و نقل و غیره نفوذ کرده است. صنعت گردشگری نیز می‌تواند با رعایت پاره‌ای از قوانین شرعی اسلام بازار بزرگ مسلمانان جهان را جذب کند. پس از حوادث یازدهم سپتامبر و مسائل ناشی از آن بیش‌تر مسلمانان دنیا گرایش به سفر به سمت کشورهای اسلامی دیگر پیدا کردند. از آنجایی که ایران کشوری اسلامی است و قوانین آن مطابق با موازین دینی اسلام است، می توان گردشگری حلال را در این کشور با سهولت بیش‌تری رونق داد و ایران می‌تواند به عنوان قطب گردشگری اسلامی و حلال در جهان تبدیل شود و از آنجایی که ایران کشوری با رویکردهای اسلامی است، بهتر از هر کشور دیگری می‌تواند این شرایط برای گردشگران مسلمان مهیا کند. هدف از انجام این پژوهش تبیین مؤلفه‌های گردشگری حلال است. تفاصيل المقالة -
حرية الوصول المقاله
2 - Nonlinear Dynamic Behaviour of The Mechanisms Having Clearance and Compliant Joints
Amirhosein JavanfarIn this paper, the rigid four-bar linkage with clearance joint has been examined. The effects of design parameters have been analyzed separately. Considering chaotic behaviour and undesirable vibrations of the system induced by joint clearance, it has been suggested to أکثرIn this paper, the rigid four-bar linkage with clearance joint has been examined. The effects of design parameters have been analyzed separately. Considering chaotic behaviour and undesirable vibrations of the system induced by joint clearance, it has been suggested to use compliant joints for improving these undesirable behaviours. Therefore, rigid four-bar linkage with clearance joint and compliant joint is investigated by pseudo-rigid-body model. Subsequently, the nonlinear behaviour of the compliant mechanism is examined, using fast Fourier transform analysis, Poincare sections, and bifurcation diagram. Comparative analysis of results clearly shows that using appropriate compliant joints causes notable improvements in the behaviour of the system, reduction of sudden impacts, and lower accelerations. 6 cycles simulations of mechanisms demonstrate the decreasing 207 impacts to 33 impacts using compliant joint. Moreover, the results report 87% decrease in follower top acceleration and 64% in clearance joint top contact force. Although using the compliant joint makes limitations in the workspace, but the appropriate and optimized design of the compliant joint results in good improvement in the performance of the system. تفاصيل المقالة -
حرية الوصول المقاله
3 - Dimensional and Geometrical Tolerance Analysis of Two Flexible Curved Sheet Metal Parts Assembly
Parisa Omidvar Maryam SaryazdiSheet metal assemblies are widely used in the automobile, aerospace, and shipbuilding industries. Sheet metals deform during the manufacturing and assembly process due to their high flexibility. Traditional tolerance analysis approaches were developed for rigid assembli أکثرSheet metal assemblies are widely used in the automobile, aerospace, and shipbuilding industries. Sheet metals deform during the manufacturing and assembly process due to their high flexibility. Traditional tolerance analysis approaches were developed for rigid assemblies; however, new approaches of tolerance analysis and variation simulations have been proposed for flexible (compliant) assemblies using FEM. In this paper, a new method called Interactive Worst Case (IWC) is introduced for tolerance analysis of flexible assemblies, which demands a few FEM simulations and is based on traditional Worst Case (WC) method. IWC method guarantees that all the parts will assemble accurately and have proper function. The case study of this paper is two flexible sheets in the form of quarter cylinders, joined together by six spot welding to form a half-cylinder assembly. The accuracy of IWC is verified by comparing the results to uniform MIC. The results of MIC are also compared to the results of the Monte-Carlo simulation (MCS). تفاصيل المقالة -
حرية الوصول المقاله
4 - Design and Dynamic Modeling of Planar Parallel Micro-Positioning Platform Mechanism with Flexible Links Based on Euler Bernoulli Beam Theory
N.S Viliani H Zohoor M.H KargarnovinThis paper presents the dynamic modeling and design of micro motion compliant parallel mechanism with flexible intermediate links and rigid moving platform. Modeling of mechanism is described with closed kinematic loops and the dynamic equations are derived using Lagran أکثرThis paper presents the dynamic modeling and design of micro motion compliant parallel mechanism with flexible intermediate links and rigid moving platform. Modeling of mechanism is described with closed kinematic loops and the dynamic equations are derived using Lagrange multipliers and Kane’s methods. Euler-Bernoulli beam theory is considered for modeling the intermediate flexible link. Based on the Assumed Mode Method theory, the governing differential equations of motion are derived and solved using both Runge-Kutta-Fehlberg4, 5th and Perturbation methods. The mode shapes and natural frequencies are calculated under clamped-clamped boundary conditions. Comparing perturbation method with Runge-Kutta-Fehlberg4, 5th leads to same results. The mode frequency and the effects of geometry of flexure hinges on intermediate links vibration are investigated and the mode frequency, calculated using Fast Fourier Transform and the results are discussed. تفاصيل المقالة
سند
Sanad is a platform for managing Azad University publications
الروابط
المراكز ذات الصلة
دعامة
الصفحات الرسمية
حقوق هذا الموقع الإلكتروني مملوكة لنظام SANAD Press Management. © 1442-1445