Mechatronics of a ball screw drive using a N degrees of freedom dynamic model

High performance position control in machine tools can only be achieved modelling the dynamic behavior of the mechatronic system composed by the motor, transmission and control during the design stage. In this work, a complex analytical model of a ball screw drive is presented and integrated in a mechatronic model of the actuator to predict the dynamic behaviour and analyze the impact of each component of the transmission. First, a simple 2 degrees of freedom model is presented, and is analysis sets the basis for the development of a more complex model of several degrees of freedom, whose resulting fundamental transfer functions are represented using natural and modal coordinates. The modeling in modal coordinates carries a reduction of the transfer function that reduces computational work. The two models are compared and experimentally validated in time and frequency domain by means of experimental tests carried out on a specifically developed ball screw drive test benchMinisterio de Economía y Competitividad: Project DPI2015-64450-R (MINECO/FEDER, UE) University of the Basque Country (UPV/EHU) under the program UFI 11/29 Departamento de Educación, Política Lingüística y Cultura” of the regional government of the Basque Country (IT949-16

Kinematics and workspace analysis of a 3ppps parallel robot with u-shaped base

This paper presents the kinematic analysis of the 3-PPPS parallel robot with an equilateral mobile platform and a U-shape base. The proposed design and appropriate selection of parameters allow to formulate simpler direct and inverse kinematics for the manipulator under study. The parallel singularities associated with the manipulator depend only on the orientation of the end-effector, and thus depend only on the orientation of the end effector. The quaternion parameters are used to represent the aspects, i.e. the singularity free regions of the workspace. A cylindrical algebraic decomposition is used to characterize the workspace and joint space with a low number of cells. The dis-criminant variety is obtained to describe the boundaries of each cell. With these simplifications, the 3-PPPS parallel robot with proposed design can be claimed as the simplest 6 DOF robot, which further makes it useful for the industrial applications

A Rapidly Reconfigurable Robotics Workcell and Its Applictions for Tissue Engineering

This article describes the development of a component-based technology robot system that can be rapidly configured to perform a specific manufacturing task. The system is conceived with standard and inter-operable components including actuator modules, rigid link connectors and tools that can be assembled into robots with arbitrary geometry and degrees of freedom. The reconfigurable "plug-and-play" robot kinematic and dynamic modeling algorithms are developed. These algorithms are the basis for the control and simulation of reconfigurable robots. The concept of robot configuration optimization is introduced for the effective use of the rapidly reconfigurable robots. Control and communications of the workcell components are facilitated by a workcell-wide TCP/IP network and device level CAN-bus networks. An object-oriented simulation and visualization software for the reconfigurable robot is developed based on Windows NT. Prototypes of the robot systems configured to perform 3D contour following task and the positioning task are constructed and demonstrated. Applications of such systems for biomedical tissue scaffold fabrication are considered.Singapore-MIT Alliance (SMA

An Overview of Kinematic and Calibration Models Using Internal/External Sensors or Constraints to Improve the Behavior of Spatial Parallel Mechanisms

This paper presents an overview of the literature on kinematic and calibration models of parallel mechanisms, the influence of sensors in the mechanism accuracy and parallel mechanisms used as sensors. The most relevant classifications to obtain and solve kinematic models and to identify geometric and non-geometric parameters in the calibration of parallel robots are discussed, examining the advantages and disadvantages of each method, presenting new trends and identifying unsolved problems. This overview tries to answer and show the solutions developed by the most up-to-date research to some of the most frequent questions that appear in the modelling of a parallel mechanism, such as how to measure, the number of sensors and necessary configurations, the type and influence of errors or the number of necessary parameters

Parallel Manipulators

In recent years, parallel kinematics mechanisms have attracted a lot of attention from the academic and industrial communities due to potential applications not only as robot manipulators but also as machine tools. Generally, the criteria used to compare the performance of traditional serial robots and parallel robots are the workspace, the ratio between the payload and the robot mass, accuracy, and dynamic behaviour. In addition to the reduced coupling effect between joints, parallel robots bring the benefits of much higher payload-robot mass ratios, superior accuracy and greater stiffness; qualities which lead to better dynamic performance. The main drawback with parallel robots is the relatively small workspace. A great deal of research on parallel robots has been carried out worldwide, and a large number of parallel mechanism systems have been built for various applications, such as remote handling, machine tools, medical robots, simulators, micro-robots, and humanoid robots. This book opens a window to exceptional research and development work on parallel mechanisms contributed by authors from around the world. Through this window the reader can get a good view of current parallel robot research and applications

고층빌딩 곤돌라 탑재용 외부 유리창 청소로봇 유닛 개발

학위논문 (석사)-- 서울대학교 대학원 : 공과대학 기계공학과, 2019. 2. 김종원.Walls of high-rise buildings are cleaned manually several times in a year by workers in a gondola. The cleaning work is difficult and extremely dangerous for human workers and there are several ongoing studies to automate this work by means of robotic solutions. To achieve a successful cleaning performance, a cleaning operation has to adapt to the environmental conditions. In this study, we design and assemble a manipulator to be used in wall-cleaning applications. From the design requirements identified by investigating a high-rise building in Korea, we determined the two important degrees-of-freedom (DOF), and a parallel mechanism is designed to achieve the motion. With the parallel configuration, the design parameters are optimized based on a dynamic index to achieve high cleaning performance in a gondola. A prototype is assembled, and the cleaning performance is verified on a test bench. A field test with the developed manipulator will be performed in the near future.빌딩의 빌딩의 벽은 청소 근로자가 근로자가 일 년에 수 차례 직접 곤돌라에 곤돌라에 탑승하여 청소합니다 청소합니다 . 청소 작업은 작업은 단순 노동이지만 노동이지만 고층에서의 고층에서의 고층에서의 작업이므로 작업이므로 매우 위험합니다 위험합니다 . 그리하여 그리하여 로봇을 로봇을 사용하여 사용하여 이 작업을 작업을 자동화하는 자동화하는 지속적인 지속적인 여러 가지 연구가 연구가 있었습니다 있었습니다 . 청소 작업에 가장 중요한 청소 성능을 성능을 높이기 높이기 위해서는 위해서는 청소 조건이 조건이 청소 환경에 환경에 적응해야 적응해야 적응해야 합니다 . 본 연구에서는 연구에서는 연구에서는 외벽 청소작업에 청소작업에 사용할 매니퓰레이터를 매니퓰레이터를 매니퓰레이터를 설계하고 제작 합니다 합니다 . 고층빌딩에 유지보수와 청소작업을 위해 의무 적으로 설치되어있는 곤돌라에 탑재하는 새로운 개념의 청소 로봇입니다 . 한국의 고층 건물을 건물을 조사해서 조사해서 나온 설계 요구 사항에서 사항에서 두 가지 중요한 중요한 매니퓰레이터의 자유도 (DOF)를 결정했습니다 결정했습니다 . 그 후, 모션을 구현하기 위한 병렬 매니퓰레이터 매니퓰레이터 매니퓰레이터 메커니즘을 메커니즘을 설계했습니다 설계했습니다 . 곤돌라에서 곤돌라에서 높은 청소 성능을 성능을 얻기 위해 병렬 매커니즘의 동적 인덱스를 기반으로 기반으로 설계 변수를 최적화 최적화 하였습니다. 그 후, 프로토 타입을 타입을 조립하고 조립하고 세척 성능을 성능을 테스트 벤치에서 벤치에서 확인합니다.1. Introduction . 1 2. Condition for wall-cleaning operation . 4 2.1 63-story building and gondola specification . 4 2.2 Cleaning operation and cleaning performace 4 2.3 Motion and constraints of the gondola motion . 5 3. 2-DOF manipulator for cleaning operation . 7 3.1 Kinematic configuration and modeling 7 3.2 Jacobian matrix . 10 3.3 Dynamic analysis 11 3.4 Mass matrix of the manipulator 12 4. Optimal design . 23 4.1 Dynamic manipulator isotropy index 23 4.2 Workspace constraints 25 4.3 Optimization problem definition . 25 4.4 Optimal design result 25 5. Prototype and experiment . 31 6. Conclusion 31 Reference 32 초록 . 34Maste

Kinematic Performance Measures and Optimization of Parallel Kinematics Manipulators: A Brief Review

This chapter covers a number of kinematic performance indices that are instrumental in designing parallel kinematics manipulators. These indices can be used selectively based on manipulator requirements and functionality. This would provide the very practical tool for designers to approach their needs in a very comprehensive fashion. Nevertheless, most applications require a more composite set of requirements that makes optimizing performance more challenging. The later part of this chapter will discuss single-objective and multi-objectives optimization that could handle certain performance indices or a combination of them. A brief description of most common techniques in the literature will be provided