scholarly journals A Simple, Reusable and Low-Cost LVDT-Based in Situ Bolt Preload Monitoring System during Fastening for a Truck Wheel Assembly

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 336
Author(s):  
Shin Jang ◽  
Juhyun Nam ◽  
Samgon Lee ◽  
Je Oh
Keyword(s):  
Monitoring System ◽  
Low Cost ◽  
Carbon Paste ◽  
Element Analysis ◽  
Bolt Preload ◽  
Resistance Variation ◽  
Conductive Line ◽  
System L ◽  
Measurement Results

The aim of this study is to design and test a new, simple, and reusable linear variable differential transformer (LVDT)-based in situ bolt preload monitoring system (L-PMS) during fastening of a truck wheel assembly. Instead of measuring the elongation of a bolt, the distance between the end surfaces of both the bolt and nut was monitored via the L-PMS. The distance obtained from the L-PMS was experimentally correlated with the actual preload measured by a washer-type load cell. Since the variation of the distance is related to the stiffness of the bolt and clamped parts, a finite element analysis was also conducted to predict the sensitivity of L-PMS. There was a strong linear relationship between the distance and bolt preload after the bolt and nut were fully snugged. However, a logarithm-shaped nonlinear relationship was irregularly observed before getting snugged, making it difficult to define a clear relationship. In order to tackle this issue, an arc-shaped conductive line was screen-printed onto the surface of the clamped parts using a conductive carbon paste. The results show that a resistance variation of the conductive line during fastening enables to determine the snug point, so the L-PMS combined with resistance measurement results in an approximately ±6% error in the measurement of bolt preload. The proposed L-PMS offers a simple but highly reliable way for measuring bolt preload during fastening, which could be utilized in a heavy-truck production line.

A Low-Cost, In Situ Resistivity and Temperature Monitoring System

2011 ◽  
Vol 32 (2) ◽  
pp. 31-39 ◽  
Author(s):  
Laura Sherrod ◽  
William Sauck ◽  
D. Dale Werkema
Keyword(s):  
Monitoring System ◽  
Low Cost ◽  
Temperature Monitoring

Modified Fabric and Its Electromagnetic Protection Characteristics

2006 ◽  
Vol 510-511 ◽  
pp. 306-309
Author(s):  
Xiao Ning Zhang
Keyword(s):  
Low Cost ◽  
Iron Alloy ◽  
Nickel Film ◽  
Shielding Effectiveness ◽  
Element Analysis ◽  
Nickel Iron ◽  
Measurement Results ◽  
Modification Technique ◽  
Nickel Iron Alloy ◽  
Better Than

A metallic modification technique on fabric is put forward in this paper. Morphologies and element analysis of modified fabric samples with copper and nickel-iron double films were carried out by using SEM and EDX. Shielding effectiveness (SE) on the samples was tested within 0.1~1000MHz and 1.5~18GHz. Within 0.1~1000MHz, modified fabric SE is between –93dB and –110dB. Two nickel-plated methods were compared. The measurement results of two modified fabric indicate that nickel-iron alloy films are better than nickel film on SE. With the advantages of low cost, flexibility , high electromagnetic protection characteristics, the modified fabric has a widely applicable foreground.

Displacement Measurement of Derrick Model Base on the Non-Contact Type Video Measurement Technology

2013 ◽  
Vol 318 ◽  
pp. 125-129
Author(s):  
Xiao Bing Xu ◽  
Xing Han ◽  
Li Yu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Low Cost ◽  
Displacement Measurement ◽  
Measurement Technology ◽  
Element Analysis ◽  
Model Base ◽  
Contact Type ◽  
The Finite Element Analysis ◽  
Measurement Results

In this paper, a non-contact type video measurement technology is introduced, and the displacements of derrick model are measured by this technology. Then comparative analysis between this measurement results and the finite element analysis results showed that the precision of measurement displacement of derrick model used this technology is good. Therefore, this technology is an effective, convenient, safe, low cost, low labor and a new method of derrick displacement measurement.

Long term in-situ test of a low-cost fiber-based crack monitoring system

2008 ◽  
Author(s):  
Guido Perrone ◽  
Massimo Olivero ◽  
Alberto Vallan ◽  
Alessio Carullo ◽  
Alessandra Neri
Keyword(s):  
Monitoring System ◽  
Low Cost ◽  
In Situ Test ◽  
Crack Monitoring

In-Flight Particle Concentration and Velocity Measurements in Thermal Spraying Using a Non-Intensified CCD Camera

1998 ◽  
Author(s):  
J. Vattulainen ◽  
T. Lehtinen ◽  
R. Hernberg ◽  
J. Knuuttila ◽  
T. Mantyla
Keyword(s):  
Plasma Spraying ◽  
Low Cost ◽  
Laser Sheet ◽  
Thermal Spraying ◽  
Ccd Camera ◽  
Deposition Efficiency ◽  
Measurement Results ◽  
Particle Velocities ◽  
Processing Techniques

Abstract Plasma spraying is a complicated process involving many partly interdependent parameters, which are in industrial spray environments difficult to optimise without laborious and time consuming experiments. In this work a non-intensified CCD camera without any external illumination is used for in-flight particle visualisation. Particle visualisation is based purely on the spontaneous light emitted by the hot particles. The motivation for this work is to outline the possibilities to develope a CCD based, low cost and rugged in-situ measurement system suitable also for industrial use. The measurement method has been tested with Plasmatechnik A3000S plasma spraying equipment using fused and crushed Al2O3 powder. Using digital image processing techniques relative particle concentrations and particle velocities have been calculated from the acquired images. These results have been correlated with wear resistance and deposition efficiency of the coatings produced with different powder feed rate and powder port adjustments. Coatings were also produced using both new and worn electrodes. The benefits and limitations of the method are discussed and the measurement results are compared against measurements made using laser sheet illumination, which can give information concerning also the colder and/or smaller particles not visible for the passive CCD system.

To Eliminate Curtain Effect of FIB TEM Samples by a Combination of Sample Dicing and Backside Milling

2014 ◽  
Author(s):  
Jian-Shing Luo ◽  
Hsiu Ting Lee
Keyword(s):  
Sample Preparation ◽  
Focused Ion Beam ◽  
Preparation Method ◽  
Low Cost ◽  
Ion Beam ◽  
Sample Preparation Method ◽  
Site Specific ◽  
Dual Beam ◽  
Transmission Electron

Abstract Several methods are used to invert samples 180 deg in a dual beam focused ion beam (FIB) system for backside milling by a specific in-situ lift out system or stages. However, most of those methods occupied too much time on FIB systems or requires a specific in-situ lift out system. This paper provides a novel transmission electron microscopy (TEM) sample preparation method to eliminate the curtain effect completely by a combination of backside milling and sample dicing with low cost and less FIB time. The procedures of the TEM pre-thinned sample preparation method using a combination of sample dicing and backside milling are described step by step. From the analysis results, the method has applied successfully to eliminate the curtain effect of dual beam FIB TEM samples for both random and site specific addresses.

Feasibility study of technology-enabled prevention intervention for children and families (Preprint)

2019 ◽  
Author(s):  
Nikki Theofanopoulou ◽  
Katherine Isbister ◽  
Julian Edbrooke-Childs ◽  
Petr Slovák
Keyword(s):  
Emotion Regulation ◽  
Pilot Study ◽  
Low Cost ◽  
Digital Camera ◽  
Well Being ◽  
Structured Interview ◽  
Object A ◽  
Intervention Delivery ◽  
Parents And Children

BACKGROUND A common challenge within psychiatry and prevention science more broadly is the lack of effective, engaging, and scale-able mechanisms to deliver psycho-social interventions for children, especially beyond in-person therapeutic or school-based contexts. Although digital technology has the potential to address these issues, existing research on technology-enabled interventions for families remains limited. OBJECTIVE The aim of this pilot study was to examine the feasibility of in-situ deployments of a low-cost, bespoke prototype, which has been designed to support children’s in-the-moment emotion regulation efforts. This prototype instantiates a novel intervention model that aims to address the existing limitations by delivering the intervention through an interactive object (a ‘smart toy’) sent home with the child, without any prior training necessary for either the child or their carer. This pilot study examined (i) engagement and acceptability of the device in the homes during 1 week deployments; and (ii) qualitative indicators of emotion regulation effects, as reported by parents and children. METHODS In this qualitative study, ten families (altogether 11 children aged 6-10 years) were recruited from three under-privileged communities in the UK. The RA visited participants in their homes to give children the ‘smart toy’ and conduct a semi-structured interview with at least one parent from each family. Children were given the prototype, a discovery book, and a simple digital camera to keep at home for 7-8 days, after which we interviewed each child and their parent about their experience. Thematic analysis guided the identification and organisation of common themes and patterns across the dataset. In addition, the prototypes automatically logged every interaction with the toy throughout the week-long deployments. RESULTS Across all 10 families, parents and children reported that the ‘smart toy’ was incorporated into children’s emotion regulation practices and engaged with naturally in moments children wanted to relax or calm down. Data suggests that children interacted with the toy throughout the duration of the deployment, found the experience enjoyable, and all requested to keep the toy longer. Child emotional connection to the toy—caring for its ‘well-being’—appears to have driven this strong engagement. Parents reported satisfaction with and acceptability of the toy. CONCLUSIONS This is the first known study investigation of the use of object-enabled intervention delivery to support emotion regulation in-situ. The strong engagement and qualitative indications of effects are promising – children were able to use the prototype without any training and incorporated it into their emotion regulation practices during daily challenges. Future work is needed to extend this indicative data with efficacy studies examining the psychological efficacy of the proposed intervention. More broadly, our findings suggest the potential of a technology-enabled shift in how prevention interventions are designed and delivered: empowering children and parents through ‘child-led, situated interventions’, where participants learn through actionable support directly within family life, as opposed to didactic in-person workshops and a subsequent skills application.

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