The main purpose of this work is to present a general approach for cam size optimization of disc cam mechanisms with eccentric translating roller followers. The objective function considered in the present study takes...
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ISBN:
(纸本)9789048196883
The main purpose of this work is to present a general approach for cam size optimization of disc cam mechanisms with eccentric translating roller followers. The objective function considered in the present study takes into account the three major parameters that influence the final cam size, namely the base circle radius of the cam, the radius of the roller and the offset of the follower. Furthermore, geometric constraints related to the maximum pressure angle and minimum radius of curvature are included to ensure good working conditions of the system. Finally, an application example is offered with the intent to discuss the main procedures and assumptions adopted in this work.
The concept of a new planetary speed increaser drive with deformable element (chain, cog belt) is developed in the paper. The variant is obtained by applying a conceptual design algorithm proposed by the authors. The ...
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ISBN:
(纸本)9789048196883
The concept of a new planetary speed increaser drive with deformable element (chain, cog belt) is developed in the paper. The variant is obtained by applying a conceptual design algorithm proposed by the authors. The algorithm contains several steps, including the establisment of the requirements list, the development of the solving structures and, finally, the identification of the planetary transmission to be used as speed increaser drive in renewable energy systems. Afterwards, the concept kinematical and dynamic features are established in order to evaluate the solving structures.
In the period of development of higher technical education great importance was given to the visibility in training of engineers. This was realized with the help of models of machines and mechanisms. Collections of mo...
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ISBN:
(纸本)9789048196883
In the period of development of higher technical education great importance was given to the visibility in training of engineers. This was realized with the help of models of machines and mechanisms. Collections of models of mechanisms were formed practically in every engineering school. This article describes the collection of centrifugal governors of BMSTU collected at the end of the 19th century. Some models were brought from Europe;others were designed and manufactured in the school (IMTS). The article gives a brief description of some models and basic principles of their operating (operation);it also provides information on the history of their creation and production.
Power efficiency of Stirling engine is low due to different causes. One of them is the displacement function of compression piston. This is pseudo-sinusoidal and is performed by a slider crank mechanism. The thermo-dy...
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ISBN:
(纸本)9789048196883
Power efficiency of Stirling engine is low due to different causes. One of them is the displacement function of compression piston. This is pseudo-sinusoidal and is performed by a slider crank mechanism. The thermo-dynamic functions should require a special displacement function for compression piston. Focusing on this request the paper proposes a new dwell mechanism.
The dimensional synthesis of spatial chains for a prescribed set of positions can be used for the design of parallel robots by joining the solutions of each serial chain at the end effector. In some cases, this may yi...
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ISBN:
(纸本)9789048196883
The dimensional synthesis of spatial chains for a prescribed set of positions can be used for the design of parallel robots by joining the solutions of each serial chain at the end effector. In some cases, this may yield a system with negative mobility. The synthesis of some overconstrained but movable linkages can be done if the finite screw system associated to the motion of the linkage is known. For these cases, the screw system could be related to the finite tasks positions traditionally defined in the synthesis theory. This paper presents the simplest case, that of the spatial RPRP closed chain, for which one solution exists.
Cylindrical worm gear sizing was done so far based on the strength *** paper gives a new method for finding the geometrical dimensions of the cylindrical worm gears of ZA, ZI and ZK types based on the conditions requi...
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ISBN:
(纸本)9789048196883
Cylindrical worm gear sizing was done so far based on the strength *** paper gives a new method for finding the geometrical dimensions of the cylindrical worm gears of ZA, ZI and ZK types based on the conditions required for that between the flanks, during the load transmission, the hydrodynamical lubrication would be kept. The module of the gear is determined based on the hydrodynamical lubrication conditions. Here, are taken into account the load to be transited, the material of the worm and that of the wheel, the surface roughness of the teeth flanks and the lubricant used. The diameter factor, the specific addendum modification and the efficiency (as high as possible) are determined based on the conditions concerning the worm shaft stiffness and the bearing strength of the worm wheel. Numerical results were obtained and given in tables based on a Matlab computing environment.
A formal definition for Jitterbug-like polyhedral linkages is presented. It is shown that the supporting polyhedral shapes cannot be arbitrary and some topological properties are derived. Also it is demonstrated that ...
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ISBN:
(纸本)9789048196883
A formal definition for Jitterbug-like polyhedral linkages is presented. It is shown that the supporting polyhedral shapes cannot be arbitrary and some topological properties are derived. Also it is demonstrated that the link lengths of the spatial loops comprising the linkage cannot be arbitrary. The spherical indicatrices of spatial loops are examined and are shown to be immobile.
Ensuring safety for human robot interaction requires knowledge of the dynamic stopping behavior of the robot. This paper presents a multibody model developed to simulate the movement of industrial robots during the br...
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ISBN:
(纸本)9789048196883
Ensuring safety for human robot interaction requires knowledge of the dynamic stopping behavior of the robot. This paper presents a multibody model developed to simulate the movement of industrial robots during the braking process. The main contribution is the suggested state-based braking model to overcome numerical problems of the friction behavior upon transitions between sliding and sticking. An analysis of the model upon ocurrance of these transitions is presented. Concluding this paper the simulation model is evaluated using measurement data from a KUKA KR16 industrial robot.
This paper describes a new methodology for teaching mechanisms at mechanical engineering courses based on Virtual Reality technology. Laboratory exercises are a fundamental part of teaching for many fields of science....
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ISBN:
(纸本)9789048196883
This paper describes a new methodology for teaching mechanisms at mechanical engineering courses based on Virtual Reality technology. Laboratory exercises are a fundamental part of teaching for many fields of science. Classical laboratory methods can be constraining because of time, expenses, scale, safety, or complexity of the real life exercises. Modern tools such as Simulink (part of Matlab software) and software based on Virtual Reality (VR) allow engineers and students to simplify algorithms and models of mechanisms, creating thus new teaching materials in order to increase the capacity of knowledge transmission and absorption. The proposed methodology integrates the above tools for the specific case of articulated mechanisms. The used software, hardware and methodology are described in detail, as well as the results.
We study the mechanical aspects of the design of optical scanners. From the most used types of scanners, we focus on those with rotating mirrors, of special importance in nowadays high end applications. A designing sc...
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ISBN:
(纸本)9789048196883
We study the mechanical aspects of the design of optical scanners. From the most used types of scanners, we focus on those with rotating mirrors, of special importance in nowadays high end applications. A designing scheme is developed for these complex optomechatronic systems. Their kinematic aspects, i.e. scanning function (generated considering the rotating mirror as a cam and the laser beam as its follower) and scanning velocity (of the laser spot) are approached. The main mechanical issues involved are pointed out, i.e. manufacturing methods, materials and tolerances, in relationship with kinetostatic and dynamic aspects, i.e. structural integrity and facets deformation of the device. We perform, with regard to some of the main parameters of the polygon, a Finite Element Analysis (FEA) for the evaluation of these aspects, for three types of the most used polygonal mirror scanners.
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