STUDY ON THE EFFECT OF WAVINESS GUIDE RAIL ERROR ON THE PRECISION OF LINEAR ROLLER BEARINGS
Published In: 6TH INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND MECHANICAL ENGINEERING
Author(s): TONG VAN CANH , SEONG-WOOK HONG , SUN-WOONG KWON
Abstract: Linear bearings are widely used to sustain positioning systems for machine tools. A linear bearing consists of a linear guide rail, rolling elements, and a carriage. For most positioning systems employing linear bearing, the guide rail error is closely related to the precision of the systems. In this study, the motion accuracy of linear roller bearings (LRBs) on the guide rail with vertical waviness error were investigated. To obtain the displacement of the carriage on the erroneous guide rail, a simulation model considering the contact surface deformation between the roller and carriage and between the roller and rail was developed. A flexible body model considering the carriage deformation due to contact load was also considered. The guide rail error was assumed to be harmonic with the period of consecutive clamping bolts because of bolt fastening to clamp the guide rail on the base. The contact loads of the LRBs were calculated with varying the amount of guide rail waviness error us
- Publication Date: 29-Apr-2018
- DOI: 10.15224/978-1-63248-150-4-31
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CONCRETE CHARACTERIZATION THROUGH DIGITAL IMAGE PROCESSING TECHNIQUES
Published In: 6TH INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND MECHANICAL ENGINEERING
Author(s): BARONETTO CARLOS , BEGLIARDO HUGO , FORNARI JAVIER , OSHIRO ANGEL , POSITIERI MARIA
Abstract: the concrete quality evaluation is defined by the statistical processing of the resistance values obtained from the rupture test specimen (potential strength), or samples (real strength). In certain occasions, when the methods above mentioned are not possible or in order to get extra information, mainly on-site, it is common to use nondestructive testing (NDT). Lately, taking advantage of photography cameras and the growing capacity and processing speed of computers, strength evaluation and concrete deformation measuring procedures have been developed based on no-contact techniques consisting of images record, their subsequent digital processing and their treatment through algorithms of computing engineering. This paper s suggests developing, based on new techniques, a classification model of conventional concrete based exclusively on the shooting of images and the subsequent proceeding of the characteristics deduced from their digitalization. The images come from tests and/or witnesse
- Publication Date: 29-Apr-2018
- DOI: 10.15224/978-1-63248-150-4-32
- Views: 0
- Downloads: 0