VIRTUAL prototypes, COULOMB friction, LAGRANGE multiplier, SLIDING friction, and REACTION time
Translational and revolute joints are the main kinds of joints in planar multilink mechanisms. Translational and revolute clearance joints have great influence on dynamical responses of planar mechanisms. Most research studies mainly focused upon revolute clearance of planar mechanisms based upon the modified Coulomb friction model, some studies investigated clearance of the pin-slot joint, and few studies researched mixed clearances (considering both translational clearance and revolute clearance) based on the LuGre friction model. Dynamic response of the 2-DOF nine-bar mechanism considering mixed clearances based on the LuGre model is investigated in this work. The dynamic model with mixed clearances is built by the Lagrange multipliers. Dynamic responses including motion output of the slider, driving torques, contact forces, shaft center trajectories at revolute clearance pairs, and slider trajectory inside the guide are analyzed, respectively. Influences of different friction models on dynamic responses are studied, such as LuGre and modified Coulomb's friction models. Effects of different clearance values and different driving speeds on dynamic responses with mixed clearances are both analyzed. Virtual prototype model considering mixed clearances is carried out through ADAMS to verify correctness. [ABSTRACT FROM AUTHOR]
The task of forming the wind-swept surface according to the results of the aircraft's inner design is described. The approach of the integration of natural and virtual prototyping in the design of equipment compartments is substantiated. Such approaches open up new possibilities for creating intelligent composition algorithms that eliminate the "blind search". For the practical implementation of these approaches, it is necessary to link the appropriate software to standard geometric modeling systems in the form of additional computational modules. Preparing the aircraft for design automation complicates the mathematical description of geometric models of placed objects, increases the complexity of their visualization in modern computer graphics systems and the need to create an additional interface between new geometric models and common CAD systems (SolidWorks, AutoCAD, COMPAS, etc.). [ABSTRACT FROM AUTHOR]
Pilat, Adam Krzysztof, Sun, Feng, Zhou, Jin, Wu, Huachun, and Ueno, Satoshi
International Journal of Applied Electromagnetics & Mechanics. 2020, Vol. 63 Issue 1, p153-170. 18p.
VIRTUAL prototypes, MAGNETIC suspension, MAGNETIC bearings, ROTATIONAL motion, ELECTROMAGNETIC forces, and PROTOTYPES
This elaboration presents an initial study of the elliptic rotor driven by the active magnetic bearing consisting of 6 poles. The analysis was realized using the virtual prototype - a numerical model of device. The model was realized with support of COMSOL Multiphysics software. The proposed geometry, selected materials and configuration were used to perform analysis if the electromagnetic forces and torque are available to drive the rotor of the elliptic shape. The control study is given to obtain a rotational motion for a fixed rotor placement at the bearing center. Numerical simulations were realized to demonstrate features and limitations of the proposed solution. The solution in a form of Virtual Prototype allows to eliminate prototyping costs and extends the knowledge and dependencies of complex mechatronic systems like active magnetic levitation technology based ones. [ABSTRACT FROM AUTHOR]
DEGREES of freedom, DYNAMIC models, WAGES, THEORY of screws, and VIRTUAL prototypes
In the process of replenishment at sea, in order to ensure the safety of workers and cargo on the deck, collisions between the cargo and the deck or cargo should be at least reduced if not avoided. Considering the actual situation of the marine environment, a fourdegree- of-freedom rope-driven rigid-flexible hybrid wave compensation mechanism for offshore hoisting equipment is proposed. First, based on the screw theory, the feasibility of a wave compensation mechanism was verified, and the experimental device of the wave compensation mechanism was designed. Then, a positional forward/reverse solution model of the wave compensation mechanism was established based on the algebraic method. Then, the kinematics model of the wave compensation mechanism was derived and the system dynamics model of the wave compensation mechanism was established based on Newton-Eulerian method. The simulation software was used to verify the derived mathematical model. It was found that the positional positive/negative solution error of the wave compensation mechanism was of the order of 10-5 mm; the MATLAB numerical simulation results and the Adams virtual prototype results of the kinematics and dynamics models were basically consistent. The maximum error was 2.4 % of the theoretical value, which is an acceptable range. The correctness of the derived kinematics and dynamics model was verified. The research results provide a theoretical basis for further performance analysis and motion control of the wave compensation mechanism. [ABSTRACT FROM AUTHOR]
Transactions of the Chinese Society of Agricultural Engineering. 2020, Vol. 36 Issue 8, p11-20. 10p.
TRIZ theory, HYBRID power, VIRTUAL prototypes, ENERGY conservation, ELECTRIC motors, HARVESTING machinery, FARM mechanization, PEAS, and HARVESTING
In view of the fact that the current mechanization technology of pea harvesting in China is basically blank, in order to realize the matching operation of pea harvesting mechanization and reduce labor input, the first equipment of pea windrower in China was designed. The characteristics of the pea plant with the soft and creeping vines make it difficult for general machines to harvest effectively. At the same time, the machines will be blocked due to the instability of feeding during harvesting. Moreover, the plants are intertwined in the process of pea plant delivery, which is easy to form delivery blockage. These problems greatly reduce the reliability of the machine and increase the difficulty of continuous harvesting. The innovative design of pea windrower equipment was studied for filling the gap of mechanized harvesting of pea crops in China. Firstly, the characteristics of pea were studied and the problems in pea harvesting were analyzed. Then, based on the plant characteristics of pea, “substance-field model” function analysis of cutting system and conveying system was carried out based on “substance-field model” analysis method in TRIZ theory. Meanwhile, “conflict solving principle” was used to analyze and solve the contradictory conflict involved in the overall system. The appropriate solution was obtained and the main mechanism of the windrower was innovated according to the plant characteristics of pea. According to the analysis, the key components such as anti-winding reel and dithering guide plate were designed. The device can solve the intertwined and blocked problem in the harvest process and realize the efficient conveying and laying operation of pea harvester. The equipment of pea windrower was equipped with hybrid power agricultural machinery drive equipment, the usage of hydraulic system to greatly adjust the height of the header. The reel and cutter are driven by electric motor, which simplifies the mechanical transmission system and helps the agricultural machinery to develop towards the direction of energy conservation and environmental protection. Finally, based on the virtual prototype technology, the model of pea windrower was established and the prototype was manufactured. and field experiments were carried out in three experiment places of Henan Nanyang, Inner Mongolia Shangdu, Beijing Pinggu. In the process of the field experiment, windrowers showed strong adaptability, the height of cutting stubble was less than 40 mm and the harvesting efficiency reached 0.13-0.19 hm2/h. In the experiment of Beijing Pinggu, the harvest loss rate was 4.96%, the leakage sowing rate was 4.78%. The results indicated that the pea windrower could meet the requirements of harvesting in different growth stages and different growth modes with neat strips and uniform stubble, and less conveying blockage. The experiments showed that the combination of agricultural machinery and agronomy can achieve a higher level of agricultural mechanization. The study can provide reference for the mechanical equipment research of pea harvest, and it is helpful to break through the bottleneck of mechanization in the key link of pea harvest, realize the popularization and application of pea production technology in China, and accelerate the development speed and quality of pea production mechanization. [ABSTRACT FROM AUTHOR]
Pérez Rodriguez, Jesüs Alberto, Rodriguez Borges, Ciaddy Gina, Pérez, Antonio Vάzquez, and Bowen, Carlos Alejandro
International Journal of Psychosocial Rehabilitation. 2020, Vol. 24 Issue 2, p544-550. 7p. 3 Color Photographs, 3 Diagrams.
ENGINEERING design, VIRTUAL prototypes, SYSTEMS design, DESIGN services, and PRODUCTION engineering
The purpose of this work is to demonstrate how emulated systems can support teaching-learning processes, as well as supporting tools for mechatronic systems design practices of low and medium complexity. In the engineering design process, it is necessary to make a prototype to verify compliance with the parameters and restrictions posed in the design conditions, but the construction of these prototypes can be expensive, especially as the device becomes more complex, in order to show the usefulness of emulated systems in the context of mechatronic systems projects, an experience was developed aimed at developing a filling and sealing system for plastic tubes, following the steps of the engineering design process, to build a virtual prototype and emulate it in order to test the control strategies of the equipment with commercial devices (LCD), the process was carried out with excellent performance and at low costs, evidencing its potential for teaching and stimulating skills and abilities in the design phase. [ABSTRACT FROM AUTHOR]
GLOBAL analysis (Mathematics), BIONICS, GEOMETRIC topology, GLOBAL studies, and VIRTUAL prototypes
Summary: Agile bionic leg mechanism (ABLM) has attracted more and more attention in the development of jumping robots and high-speed running robots. However, theoretical study of the global structure for motility characteristics and its evolution is few. By using the modern mathematical tools such as singular theory, geometric topology, and group theory, a global scale analysis method for kinematic performance of mechanisms is proposed. Taking 6-bar with two rings mechanism as an example, a detailed analysis process is studied. The 6-bar ABLM designed by this theory is verified by virtual prototype simulation experiment. The global scale analysis of 4-bar linkage is also carried out by using this method, and the result is compared with the "Grashof criterion" to verify the correctness of this method. It provides a general theory and method for innovative design and global scale analysis of ABLM. [ABSTRACT FROM AUTHOR]
Xia, Qinxiang, Ming, Xinjian, Long, Jinchuan, and Liu, Xiujuan
Multidiscipline Modeling in Materials & Structures (Emerald Group Publishing Limited). 2020, Vol. 16 Issue 2, p225-237. 13p.
STRUCTURAL design, LITHIUM-ion batteries, VIRTUAL prototypes, STRUCTURAL shells, TURNTABLES, WORK structure, and WORK values
Purpose: The purpose of this paper is to design the whole structure of high-speed automatic casing system (HSACS) for lithium-ion battery (LIB), and verify its rationality and reliability by kinematic simulation and casing test. Design/methodology/approach: Based on the software of SolidWorks and ADAMS, the structure of working mechanisms for HSACS was designed, and virtual prototype models of HSACS and main turntable were established to realize the kinematic analysis. The HSACS casing test was also carried out and compared with simulation. Findings: Simulation results for the designed HSACS were presented graphically and analyzed. The graphical results indicate that the coordination motions among the working mechanisms of HSACS are reasonable and no interference occurs. Casing test results show that the casing quality and production efficiency of HSACS equipment are satisfying. Originality/value: In the present work, the developed virtual prototype models of HSACS provide reliable kinematic analysis results for the structural design of HSACS, and reasonable motion relations are realized in the designed structure of HSACS. Furthermore, not only the casing quality requirements can be met, but also the production efficiency of high-speed automatic casing machine for LIB is greatly improved via this kind of new HSACS structure. [ABSTRACT FROM AUTHOR]
In this work a numerical procedure for the design of highly damped multi-layer coating architectures, to be applied in thin-walled mechanic components, is proposed. Optimization restraints with respect to vibration and acoustic emission reduction in operating conditions are considered. The procedure makes use of a multi-layer beam model that takes into account of dissipative actions at the interface between different layers. Dynamic mechanical measurement tests on uncoated and coated symmetric beams are used to identify the unknown material stiffness and interface parameters needed as input by the multi-layer beam model. A virtual prototyping procedure for the simulation of the dissipative effect of different multi-layer coating architectures is proposed and experimentally validated. The damping behaviour of coated slender beam specimens is tested by means of experimental measurements. Coating solutions, based on epoxy organic polymeric materials, and some architectures employing them are presented in this work. Real application examples, concerning the acoustic emission of mechanical gear pumps adopting uncoated and coated casings are presented, by means of the comparison of sound pressure measurements, related to these different configurations, in operating conditions. [ABSTRACT FROM AUTHOR]
The reliability analysis is a quantification of the sources of failures in a product, with emphasis on the most significant contributors towards the overall product unreliability. As the reliability analysis of complex products is very crucial for analyzing the behavior of the products, many researches have been focused on it in recent decades with a result of many valuable contributions. However, current researches always focus on rigid product, while the product is always a rigid-flexible coupling multibody system, which could affect the accuracy of reliability analysis. This paper is devoted to virtual prototyping-based approach to a fuzzy Failure Mode, Effects, and Criticality Analysis (FMECA) with the consideration of rigid-flexible coupling virtual prototyping model. This paper discussed proposed approach in detail with three steps: the traditional FMECA method, the fuzzy FMECA method, and the rigid-flexible coupling-based analysis for FEMCA. The cold heading machine is given as an example which demonstrates that the methodology is helpful to reliability analysis. The physical prototyping is also carried out to demonstrate the product reliability. [ABSTRACT FROM AUTHOR]
In the automotive industry, the transfer of car bodies among manufacturing systems is performed with the help of industrial robots equipped with lifting end effectors. Such End-of-Arm Tooling is subject to bending loads, demanding an adequate sizing process to be deployed to ensure imposed structural reliability criteria. This paper addresses limiting aspects of the process, with emphasize on computer aided engineering simulations performed as part of product design software suites. A new approach is proposed involving the use of simplified finite element modeling. This allows for the load distribution to be captured precisely with minimal computational expenses. [ABSTRACT FROM AUTHOR]
CONSTRAINTS (Physics), DYNAMIC mechanical analysis, VIRTUAL prototypes, MATHEMATICAL optimization, ROBOTS, MOBILE robots, and RAPID prototyping
SUMMARY: An analytical model with coupled dynamics for a realistic six-legged robotic system locomoting on various terrains has been developed, and its effectiveness has been proven through computer simulations and validated using virtual prototyping tools and real experiment. The approach is new and has not been attempted before. This study investigated the optimal feet-forces' distributions under body force and foot–ground interaction considering compliant contact and friction force models for the feet undergoing slip. The kinematic model with 114 implicit constraints in 3D Cartesian space has been transformed in terms of generalized coordinates with a reduced explicit set of 24 constrained equations using kinematic transformations. The nonlinear constrained inverse dynamics model of the system has been formulated as a coupled dynamical problem using Newton–Euler method with realistic environmental conditions (compliant foot–ground contact, impact, and friction) and computed using optimization techniques due to its indeterminate nature. One case study has been carried out to validate the analytical data with the simulated ones executed in MSC.ADAMS® (Automated Dynamic Analysis of Mechanical Systems), while the other case study has been conducted to validate the analytical and simulated data with the experimental ones. In both these cases, results are found to be in close agreement, which proves the efficacy of the model. [ABSTRACT FROM AUTHOR]