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Novel Mobility Formula for Parallel Mechanisms Expressed with Mobility of General Link Group

Chinese Journal of Mechanical Engineering 2013年第6期26卷 1082-1090页

作者： ZHANG Yitong LU Wenjuan MU Dejun YANG Yandong ZHANG Lijie ZENG Daxing Key Laboratory of Parallel Robot and Mechatronic System Yanshan University Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University

The determination of virtual constraints is always one of the key and difficult problems in traditional mobility calculation. To make mobility calculation simple, considering avoiding virtual constraints, some new formulae have been presented, however these formulae can hardly intuitively reflect general link group＇s restrictions on output member and its influences on independence of output parameters, which is premise to the judgment of the properties of mobility. Towards the problem to reveal the intrinsic relationship between the degree of freedom（DOF） of a mechanism, the link group, and the dimension of output parameters, also to avoid determination of virtual constraint, based on the new concepts of the ＂DOF of general link group＂ and ＂node parameters＂, a new formula in the calculation of the mobility of mechanisms is presented that is expressed with DOFs of the general link groups and rank of motion parameters of base point of the output link. It is named GOM（mobility of groups and output parameter） formula. On the basis of new concepts of＂effective parameters＂ and ＂invalid parameters＂, a rule is put forward for solving the DOF of mechanisms with invalid parameters by GOM formula, that is, the base point parameters are the subset of effective parameters of link group. Thereafter, several examples are enumerated and the results coincide with the prototype data, which proves the validity of the proposed formula. Meanwhile, it is obtained that the necessary and sufficient condition for the judgment of output parameters independence is that each of the DOF of the link group is not less than zero. The proposed formula which is simple in calculation provides theoretical basis for the judgment of independence of output parameters and provides references for type synthesis of novel parallel mechanisms with independence requirements of their output parameters.

关键词： parallel mechanism degree of freedom general link group output parameters

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Determining the Optimal parameters of an Advanced Linter Machine

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Engineering（科研） 2023年第12期15卷 810-820页

作者： Obidov Avazbek Azamatovich A.J.B. O’g’li Qosimov Axtam Akramovich Department of Technological Machines and Equipment Namangan Institute of Engineering and Technology Namangan Uzbekistan Department of Metrology Standardization and Quality Management Namangan Institute of Engineering and Technology Namangan Uzbekistan

In this article, research was conducted to improve Linter machines that remove short fibers remaining in ginned cotton seeds at cotton ginneries. The study examined the effect of changing the dimensions of the brush drum, guide and mesh surface in the cleaning device proposed for the linting machine on the movement of the peg and the cleaning efficiency, and the highest level of efficiency in separating impurities from the peg was determined. During the study, the main factors influencing the effective operation of the improved linting machine were identified, the limits of their values were determined, and studies were carried out using the mathematical modeling method. As a result, at the values of the given coefficients, efficient operation of the improved linting machine was observed, that is, the lint cleaning efficiency reached 55.1%.

关键词： Linter Machine Fluff Impurities Cleaning Efficiency Lint Brush Drum Guide Mesh Surface Input Factors output parameters Working Element Tilt Angle Speed

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Comparison of Experimental and Theoretical output Power of Grid Connected Photovoltaic System in Super Mega Factory

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Journal of Electrical Engineering 2018年第1期6卷 28-32页

作者： Kyaw Kyaw Htet Than Zaw Htwe Wint Wint Kyaw Zeya Oo Department of Electrical Power Engineering Yangon Technological University Yangon 095 Myanmar Department of Engineering Physics Yangon Technological University Yangon 095 Myanmar

In this paper, the performance of grid connected PV system that is installed in Super Mega Factory is presented. The output parameters of 4 kW PV is collected and analyzed. Then, according to the results the weak points of the system were found and the theoretical output power was compared. After that we try to get the maximum output power making the correction of collector angle and place suitable panel position.

关键词： Grid connected PV system output parameters theoretical output power.

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