scholarly journals Automatic Expanding Mandrel with Air Sensing Device: Design and Analysis

2020 ◽  
Vol 10 (7) ◽  
pp. 2551
Author(s):  
Enrique Soriano Heras ◽  
Higinio Rubio ◽  
Alejandro Bustos ◽  
Juan Carlos García Prada
Keyword(s):  
Computational Model ◽  
Wedge Angle ◽  
Precision Machining ◽  
Clamping Force ◽  
Force Transmission ◽  
The Finite Element Method ◽  
Sensing System ◽  
Transmission Structure ◽  
High Degree ◽  
Internal Bore

In precision machining, expanding mandrels are used for jobs with close tolerances. An expanding mandrel consists of a tapered arbor or shaft, with a thin-slotted clamping sleeve or collet made of hardened steel. The internal tapered and external cylindrical surfaces are ground to a high degree of accuracy, and the mandrel expands to fit the internal bore of the workpiece. Expanding mandrels are, essentially, wedge mechanisms. This paper proposes an automatic expanding mandrel with a novel force transmission system for high stiffness within a novel air sensing system, which allows detection of the correct part position before starting machining. A computational model for determining the dynamic clamping force of the proposed mechanism is developed and implemented using MATLAB. This model considers the influence of the stiffness behaviors of the collet, force transmission structure and workpiece. Additionally, this paper presents the finite element method analyses which were conducted to check the proposed computational model. The amount of clamping force transmitted by a collet chuck holder depends strongly on: clearances, wedge angle, stiffness of the collet chuck holder and workpiece stiffness.

scholarly journals A SIMULATION MODEL FOR ROBOT’S SLIP DISPLACEMENT SENSORS

2016 ◽  
pp. 224-236 ◽  
Author(s):  
Yuriy Kondratenko ◽  
Oleksandr Gerasin ◽  
Andriy Topalov
Keyword(s):  
Simulation Model ◽  
Field Programmable Gate Array ◽  
Hardware Implementation ◽  
Displacement Sensor ◽  
Clamping Force ◽  
Sensing System ◽  
Displacement Sensors ◽  
Field Programmable ◽  
Slip Displacement ◽  
Corrosive Environments

This paper deals with a simulation model of slip displacement sensors for the object slip signals’ registration in the adaptive robot’s gripper. The study presents the analysis of different methods for slip displacement signals detection, as well as authors’ solutions. Special attention is paid to the investigations of the developed sensor with the resistive registration element in rod type structure of sensitive elements, which is able to operate in harsh and corrosive environments. A sensing system for the object slip signals’ registration in the adaptive robot’s gripper with a clamping force correction is developed for proposed slip displacement sensor with multi-component resistive registration elements. The hardware implementation of the sensing system for slip signals’ registration and obtained results are considered in details. The simulation model of the proposed slip displacement sensor based on polytypic conductive rubber is modeled by Proteus software. The intelligent approaches with the use of a field programmable gate array (FPGA) and VHDL-model to the sensing system designing allow to define the slippage direction in slip displacement sensor based on resistive registration elements. Thus, this expands the functionality of the developed sensor.

scholarly journals The analysis of the parameters for deep drawing of cylindrical parts

2018 ◽  
Vol 178 ◽  
pp. 02011
Author(s):  
Dan Chiorescu ◽  
Esmeralda Chiorescu ◽  
Sergiu Olaru
Keyword(s):  
Finite Element ◽  
Deep Drawing ◽  
The Finite Element Method ◽  
Ansys Software ◽  
Forming Process ◽  
Thin Steel ◽  
Metal Forming Process ◽  
Cylindrical Parts ◽  
Cylindrical Cup ◽  
High Degree

Deep drawing is a very important metal forming process. Thin steel sheet is important material for manufacture of numerous products with deep drawing and stamping. Cold working provides also the possibility of making parts of various shapes, from the simplest to those with a high degree of complexity whose execution through other methods is uneconomical, difficult and sometimes even impossible. In this paper it is analyzed both experimentally and with the help of the finite element, the behavior of the blank during the cylindrical cup deep drawing process, using the ANSYS software program and the finite element method. A comparison is realized between the experimental and the analytical results, elaborating a representative set of problems that analyze the variation of the die punch clearance, movement of the punch and with or without lubrication. The results of the research are useful in developing a sensible design of experiments.

Modeling and Design of Prosthetic Abutment System to Evaluate the Complex Interface

2014 ◽  
Vol 658 ◽  
pp. 471-476
Author(s):  
Mariana Rotariu ◽  
Florin Munteanu ◽  
Marius Turnea ◽  
Dragos Arotaritei
Keyword(s):  
Recovery Process ◽  
Individual Variability ◽  
The Finite Element Method ◽  
Simulation Research ◽  
Biomechanical Models ◽  
Therapy Program ◽  
Interdisciplinary Field ◽  
Successful Recovery ◽  
High Degree

The biomechanics of the stump-prosthesis system and of the biphasic interaction between bone and muscle and also between stump and prosthesis belongs to a new interdisciplinary field in which modeling and numerical simulation research is the best solution to capture and investigate particular biomechanical aspects that have a high degree of intra-and inter-individual variability. By means of the reverse dynamics method, during the foot resting on the floor stages, one may thus define the biomechanical models of the anatomic stump-prosthesis system. The solution suggested relies on a set of methods including techniques specific to medical imaging analysis and processing, graphical 3D representation of the anatomic model developed using experimental data and its manipulation for study-related purposes or for later processing.The CAD modeling of the anatomic structures and prosthesis components was done using a series of conventional techniques available in the CAD SolidWorks 2008 and CosmosWorks2008 programming environment. A prerequisite for a successful recovery process is the patient’s availability to get actively involved in a physical therapy program. The monitoring of patients with amputated limbs that leave the hospital and of the complications developed in time in these patients is difficult since some miss their periodic follow-up examinations or are referred to other specialized departments. Therefore, a prediction of the evolution of the diminished functional capacity of patients with amputated limbs by stump-prosthesis system design using the finite element method is much more efficient.

Numerical Simulation of Self-Loosening of Bolted Joints under Cyclic Transverse Loads

2014 ◽  
Vol 487 ◽  
pp. 488-493 ◽  
Author(s):  
Shi Yuan Hou ◽  
Ri Dong Liao
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Step Length ◽  
Shear Loading ◽  
Bolted Joints ◽  
Shear Load ◽  
Clamping Force ◽  
The Finite Element Method ◽  
Force Amplitude ◽  
Transverse Loads

Self-loosening is one of the major failure reasons for bolted joints. Utilizing the finite element method, a 3-Dimension finite element model under dynamic shear loading is built to study the loosening of bolted fastener phenomenon. And the effect of increment step length, initial clamping force, amplitude of the shear load, thread tolerance, friction coefficients on the loosening process are studied.

scholarly journals Lateral Subunit Coupling Determines Intermediate Filament Mechanics

2019 ◽  
Author(s):  
Charlotta Lorenz ◽  
Johanna Forsting ◽  
Anna V. Schepers ◽  
Julia Kraxner ◽  
Susanne Bauch ◽  
...  
Keyword(s):  
Ionic Strength ◽  
Computational Model ◽  
Optical Tweezers ◽  
Intermediate Filament ◽  
Mechanical Response ◽  
Strain Curve ◽  
Mechanical Behaviors ◽  
Molecular Architectures ◽  
High Degree ◽  
Vimentin Filaments

The cytoskeleton is a composite network of three types of protein filaments, among which in-termediate filaments (IFs) are the most extensible ones. Two very important IFs are keratin and vimentin, which have similar molecular architectures, but different mechanical behaviors. Here we compare the mechanical response of single keratin and vimentin filaments using optical tweezers. We show that the mechanics of vimentin strongly depends on the ionic strength of the buffer and that its force-strain curve suggests a high degree of cooperativity between subunits. Indeed, a computational model indicates that in contrast to keratin, vimentin is characterized by strong lateral subunit coupling of its charged monomers during unfolding of α-helices. We conclude that cells can tune their mechanics by differential use of keratin versus vimentin.

scholarly journals Quantifying cross-linguistic influence with a computational model

2018 ◽  
Vol 8 (5) ◽  
pp. 561-605
Author(s):  
Yevgen Matusevych ◽  
Afra Alishahi ◽  
Ad Backus
Keyword(s):  
Second Language ◽  
Computational Model ◽  
Language Learning ◽  
Second Language Learning ◽  
Choice Task ◽  
Behavioral Patterns ◽  
Case Marking ◽  
Participant Roles ◽  
Sentence Interpretation ◽  
High Degree

Abstract Cross-linguistic influence (CLI) is one of the key phenomena in bilingual and second language learning. We propose a method for quantifying CLI in the use of linguistic constructions with the help of a computational model, which acquires constructions in two languages from bilingual input. We focus on the acquisition of case-marking cues in Russian and German and simulate two experiments that employ a picture-choice task tapping into the mechanisms of sentence interpretation. Our model yields behavioral patterns similar to human, and these patterns can be explained by the amount of CLI: the negative CLI in high amounts leads to the misinterpretation of participant roles in Russian and German object-verb-subject sentences. Finally, we make two novel predictions about the acquisition of case-marking cues in Russian and German. Most importantly, our simulations suggest that the high degree of positive CLI may facilitate the interpretation of object-verb-subject sentences.

scholarly journals Numerical Analysis of the Ability of a Floating Vehicle to Overcome a Water Obstacle

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Krzysztof Kosiuczenko ◽  
◽  
Robert Sosnowicz ◽  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Computational Model ◽  
Difficult Problem ◽  
Point Of View ◽  
Vehicle Safety ◽  
Extreme Conditions ◽  
The Finite Element Method ◽  
Element Method

The paper presents the results of simulation tests of the entry of a floating transporter to a water obstacle. The simulation tests were performed with the use of LS Dyna program, based on the finite element method (FEM). The computational model was developed and used in the simulation of the manoeuvre of entering the water obstacle for the extreme conditions, which are described by NATO standards. For a model, as an example vehicle, the floating transporter PTS-M was used. The results of the application of the elaborated model confirmed the possibility to utilise the method to verify the behaviour of a vehicle in a very important and difficult problem from the point of view of vehicle safety conditions.

Theory of Isotropic Transmission for Tendon-Driven Manipulators

1994 ◽  
Author(s):  
Yeong-Jeong Ou ◽  
Lung-Wen Tsai
Keyword(s):  
General Theory ◽  
Power Transmission ◽  
Degree Of Freedom ◽  
Mechanical Power ◽  
Force Distribution ◽  
Static Force ◽  
Force Transmission ◽  
Transmission Characteristics ◽  
End Effector ◽  
Transmission Structure

Abstract This paper deals with the synthesis of the mechanical power transmission structure in tendon-driven manipulators. Based on the analysis of static force transmission from the actuator space to the end-effector space, a general theory is developed for the synthesis of tendon-driven manipulators with isotropic transmission characteristics. It is shown that an n-dof (degree of freedom) manipulator can possess these characteristics if it is made up of n+1 or 2n tendons and if its link lengths and pulley sizes are designed according to two equations of constraint. Two examples are used to demonstrate the theory. It is also shown that manipulators with an isotropic transmission structure do have more uniform force distribution among their tendons.

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