Search results for "AMPER"

The affect of contact force sensations on user performance in virtual assembly tasks

2007

International audience; Abstract The development of a realistic virtual assemblyenvironment is challenging because of the complexity of the physical processes and the limitation of available VRtechnology. Many research activities in this domain pri-marily focused on particular aspects of the assembly task such as the feasibility of assembly operations in terms of interference between the manipulated parts. The virtualassembly environment reported in this research is focusedon mechanical part assembly. The approach presented ad-dresses the problem of part-to-part contacts during themating phase of assembly tasks. The system describedcalculates contact force sensations by making their inten-s…

Eino Heikkinen 1939-2022

2023

Gerontologian professori emeritus Eino Heikkinen kuoli kotonaan Helsingissä jouluaaton aattona 2022. Hän oli suomalaisen nykygerontologian tienraivaaja, jonka näkemyksellisyys ja rohkeat avaukset vaikuttivat suuresti ikääntymistutkimuksen kehitykseen ja instituutioihin. nonPeerReviewed

Lisää oikaisuja suomalaisen tieteen historiaan : pitkäaikaisin professori

2020

Optimization of vehicle-trailer connection systems

2016

The three main requirements of a vehicle-trailer connection system are: en route stability, over- or under-steering restraint, minimum off-tracking along curved path. Linking the two units by four-bar trapeziums, wider stability margins may be attained in comparison with the conventional pintle-hitch for both instability types, divergent or oscillating. The stability maps are traced applying the Hurwitz method or the direct analysis of the characteristic equation at the instability threshold. Several types of four-bar linkages may be quickly tested, with the drawbars converging towards the trailer or the towing unit. The latter configuration appears preferable in terms of self-stability and…

An iterative based approach for hysteresis parameters estimation in Magnetorheological dampers

2012

The following work entails the problem of regenerating the hysteresis loop in the Magnetorheological (MR) dampers. The collected data from tests are not sufficient neither efficient for designing optimal controls compensating for the hysteresis in the dampers. This work presents an iterative based approach for estimating the hysteresis parameters, the method however can be generalized for different kind of dampers or actuators hence the hysteresis loop can be generalized using available test data. Some assumptions can be introduced in order to facilitate the underlines of the parameters estimation, one of the assumptions in this work is to use predetermined hysteresis parameters and regener…

Firefly optimization used to identify hysteresis parameter on rotational MR-damper

2014

In his paper the physical properties and mathematical models of a semi-active magnetorheological (MR) damper is studied. The considered models are the Dahl model and Bouc-Wen model. The parameters for these models are found by using a firefly optimization algorithm that minimizes the difference between experimental and simulated data. The objective of his paper is to compare different mathematical MR-damper models with the experimental data. The simulation results illustrate he effectiveness of he proposed optimization algorithm.

Zur Rolle des Deutschen aus der Sicht von Studierenden in Finnland eine Umfrage unter den Studierenden der Universitäten Jyväskylä und Tampere

2008

Kalmbergin kartasto R III : List 8

1855

Bezpieczne granice - wolny obywatel

2015

Damping of rotor conical whirl by asymmetric dry friction suspension

2009

Abstract A new technique for the rotor whirl damping in rotating machinery, based on the elastic suspension of the journal boxes and the use of dry friction surfaces normal to the shaft axis between their supports and the frame, is here analysed theoretically for several cases of rotor systems characterized by mass and constraint asymmetry, where gyroscopic effects are to be expected and conical whirl motions may grow up. The critical flexural speeds can be easily cut off by an adhesive state of the supports and the whirl amplitude can be minimized as well throughout the remaining sliding range. Confining the operative angular speed of the rotor in the range of adhesive contact between the …