The paper present an original method of designing crossed axes helical gears with addendum modification based on the sliding between the meshing teeth's flanks. Based on the equalization of the relative sliding co...
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ISBN:
(纸本)9789048196883
The paper present an original method of designing crossed axes helical gears with addendum modification based on the sliding between the meshing teeth's flanks. Based on the equalization of the relative sliding coefficients at the points where the meshing begins and ends the geometrical dimensions of the helical gears are determined. The efficiency is computed taking into account the friction coefficient between the tooth flanks and the declination teeth angles rolling cylinders. The numerical results are computed using Matlab by multiobjective optimization of the values for the equalized sliding coefficients and the efficiency of the helical gears. Based on this method the designer is helped to responsible choose the helical gear in terms of gauge, efficiency and uptime.
Minimally invasive surgery was developed as a necessity to improve the quality of life after surgical interventions, to decrease the costs of hospitalization and to shorten recovery of the patient. Rapid development a...
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ISBN:
(纸本)9789048196883
Minimally invasive surgery was developed as a necessity to improve the quality of life after surgical interventions, to decrease the costs of hospitalization and to shorten recovery of the patient. Rapid development and the growing complexity of minimally invasive surgery are arguments for implementing a comprehensive training method to acquire special technical skills. The paper presents the development of an training platform for hepatic minimally invasive surgery using parallel robots, which focuses on two important aspects: the training of surgeons in laparo-scopic liver surgery and the possibility of interactive pre-planning of the surgical procedure in a virtual environment.
Robotic surgery and telemedicine become wide spread in medical world and these techniques are used more and more in a large number of surgical interventions. The limits of all these modern technologies are pushed by s...
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ISBN:
(纸本)9789048196883
Robotic surgery and telemedicine become wide spread in medical world and these techniques are used more and more in a large number of surgical interventions. The limits of all these modern technologies are pushed by surgeons, required by patients and stimulated by industry. There is a concern regarding the accelerating evolution of technology which may lead to some fantastic scenarios such as autonomous surgeon, criminal interference during a telesurgical intervention and other aspects. In this article the ethical issues of the robotic surgery and telemedicine are debated in order to initiate the development of a set of ethical rules in this field.
This paper proposes a theoretical approach related to the kinematic issues of dexterous robotic hands. A new anthropomorphic robotic hand is presented in the first part, while in the second part of this paper the auth...
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ISBN:
(纸本)9789048196883
This paper proposes a theoretical approach related to the kinematic issues of dexterous robotic hands. A new anthropomorphic robotic hand is presented in the first part, while in the second part of this paper the authors present a general method which allows fast and easy computations in order to find the solution(s) of the direct and inverse kinematic problem for this hand.
The use of so-called compliant elements with specifically adjustable compliances offers the possibility to transmit motions just by structural deformations. This paper makes a contribution to the efficient cyclic test...
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ISBN:
(纸本)9789048196883
The use of so-called compliant elements with specifically adjustable compliances offers the possibility to transmit motions just by structural deformations. This paper makes a contribution to the efficient cyclic test of textile-reinforced compliant structures by developing a novel kinematic test stand realizing pure bending.
mechanisms are used especially in automatic process, production and packaging machinery where a high degree of automation is required, especially because they are fast and precise when it comes to coordination of depe...
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ISBN:
(纸本)9789048196883
mechanisms are used especially in automatic process, production and packaging machinery where a high degree of automation is required, especially because they are fast and precise when it comes to coordination of dependant motion. Due to the restricted flexibility of such motion solutions they are not optimal when the motion requirements are changing. Then often a completely new mechanism has to be installed or it is completely replaced by a servo electric drive that allows a non-uniform input motion. Whether the complete mechanism can be replaced by a servo-electric drive or if a simple mechanism with servo-drive is more favorable can be determined using proper simulation models. Using a typical motion task in process machinery a comparison of different cases will be presented, leading to a typical simulation procedure for the layout and design of suitable motion devices.
In this paper we are presenting the results of the research based on dynamic simulation of human knee virtual model. Starting from the parts realized with computer tomography help, there were realized virtual models f...
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ISBN:
(纸本)9789048196883
In this paper we are presenting the results of the research based on dynamic simulation of human knee virtual model. Starting from the parts realized with computer tomography help, there were realized virtual models for the femur, tibia, meniscus and ligaments that form the complex human knee joint, and their meshing in finite elements. There are presented comparative stress diagrams for the normal walking and for the case of sectioned anterior crisscross ligament. Maps of stress are presented for the whole joint and for its components, to different movement moments. 3DP rapid prototyping technology is used to obtain the components of the human knee joint necessary for future experimental research.
The fundamental purpose of suspension system in various kinds of vehicles is the improvement of the ride comfort and reduction of dynamic road-tyre forces leading to better ride comfort and handling properties. In thi...
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ISBN:
(纸本)9789048196883
The fundamental purpose of suspension system in various kinds of vehicles is the improvement of the ride comfort and reduction of dynamic road-tyre forces leading to better ride comfort and handling properties. In this paper the ride comfort and dynamic road-tyre-forces of a passenger car (segment D) with passive suspension system are compared to the same passenger car with semi-active suspension system based on a friction controlled damper. The passenger car is modelled in the general multi-body design program CarSim. For creating the control system of the semi-active friction damper another general program Matlab/Simulink was used. The control strategy is based on the reduced feedback. Parameters of the control algorithm of the semi-active friction damper were optimized for a given road profile using genetic algorithms. The results of numerical simulations show that implementation of the semi-active friction dampers could produce a significant improvement of the ride comfort and handling properties of passenger cars.
The main purpose of this work is to present a complete kinematic analysis of the roller motion in translating cam-follower mechanisms with translating roller followers. The main kinematic variables of the roller are t...
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ISBN:
(纸本)9789048196883
The main purpose of this work is to present a complete kinematic analysis of the roller motion in translating cam-follower mechanisms with translating roller followers. The main kinematic variables of the roller are the angular velocity and angular acceleration. These quantities are deduced in a general form, in such a way they can be easily used for different cam laws. Furthermore, the influence of the functioning cam-follower parameters can also be included. Finally, an example of application is offered to analyze and discuss the main procedures considered in this work.
The Parvus is a miniaturized precision robot driven by micro drives. The robot is well suited for pick-and-place applications with a repeatability in the range of a few micrometers. Due to the miniaturization of the m...
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ISBN:
(纸本)9789048196883
The Parvus is a miniaturized precision robot driven by micro drives. The robot is well suited for pick-and-place applications with a repeatability in the range of a few micrometers. Due to the miniaturization of the machine parts used in the Parvus, disturbing effects in the robot drives in combination with load torque cause dynamic vibrations of the robot structure. To optimize the dynamic behavior of the robot, the common approach of a computed torque feed forward control (CTFF) strategy is investigated. The results of the inverse dynamic model show why this control strategy is not applicable in this case, but gives insight for other approaches.
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