Motorised digital levels: development and applications

Pellegrinelli, Alberto; Furini, Alessio; Bonfè, Marcello; Russo, Paolo

doi:10.1179/1752270612y.0000000039

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…Shiu modeled the systematic errors in angle measurement in a virtual level [8]. Pellegrinelli designed a low-cost motorization of the Leica DNA03 digital level to enable the automatic monitoring of deformations, without compromising its manual use in leveling [9]. Geng studied the localization principles of reading data automatically with a digital level based on a double sinusoidal code ruler [10].…”

Section: Measurement Science and Technologymentioning

confidence: 99%

A flexible and cost-effective compensation method for leveling using large-scale coordinate measuring machines and its application in aircraft digital assembly

Deng

Huang

2018

Meas. Sci. Technol.

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In the assembly process of large-size aerospace products, the leveling and horizontal alignment of large components are essential prior to the installation of an inertial navigation system (INS) and the final quality inspection. In general, the inherent coordinate systems of large-scale coordinate measuring devices are not coincident with the geodetic horizontal system, and a dualaxis compensation system is commonly required for the measurement of difference in heights. These compensation systems are expensive and dedicated designs for different devices at present. Considering that a large-size assembly site usually needs more than one measuring device, a compensation approach which is versatile for different devices would be a more convenient and economic choice for manufacturers. In this paper, a flexible and cost-effective compensation method is proposed. Firstly, an auxiliary measuring device called a versatile compensation fixture (VCF) is designed, which mainly comprises reference points for coordinate transformation and a dual-axis inclinometer, and a kind of network tighten points (NTPs) are introduced and temporarily deployed in the large measuring space to further reduce transformation error. Secondly, the measuring principle of height difference is studied, based on coordinate transformation theory and trigonometry while considering the effects of earth curvature, and the coordinate transformation parameters are derived by least squares adjustment. Thirdly, the analytical solution of leveling uncertainty is analyzed, based on which the key parameters of the VCF and the proper deployment of NTPs are determined according to the leveling accuracy requirement. Furthermore, the proposed method is practically applied to the assembly of a large helicopter by developing an automatic leveling and alignment system. By measuring four NTPs, the leveling uncertainty (2σ) is reduced by 29.4% to about 0.12 mm, compared with that without NTPs.

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Section: Measurement Science and Technologymentioning

confidence: 99%

A flexible and cost-effective compensation method for leveling using large-scale coordinate measuring machines and its application in aircraft digital assembly

Deng

Huang

2018

Meas. Sci. Technol.

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“…Um exemplo de protótipo de automação para nível digital pode ser encontrado em Pellegrinelli et al(2013). Neste artigo explica-se como foi desenvolvido um sistema de automação para o nível digital DNA 03 para permitir o monitoramento automático e contínuo de deformações em estruturas sem comprometer seu uso manual no nivelamento.…”

Section: Automação Do Monitoramento Altimétricounclassified

Validação Do Sistema De Automação De Nível Digital Aplicado Na Determinação De Recalques

2017

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O objetivo desta pesquisa é validar um sistema de automação de níveis digitais, desenvolvido em uma tese de doutorado (Andolfato, 2010) e apresentado ao curso de pós-graduação em ciências Geodésicas da UFPR. O procedimento de validação consiste em utilizar o nível digital através do nivelamento geométrico pelo método das visadas extremas para determinar desníveis entre alvos distribuídos com diferentes distâncias em relação ao nível. A simulação do recalque foi realizada através de pinos fixados em várias colunas, em diferentes alturas. A primeira fase consistiu em determinar os desníveis e consequentemente os recalques com o sistema convencional, utilizando um técnico como observador. Posteriormente estes mesmos recalques foram determinados utilizando o SAND (Sistema de Automação de Nível Digital). Depois de concluídos os levantamentos, os resultados obtidos com o SAND foram comparados com os do levantamento convencional e constatou-se que as diferenças de valores entre os recalques detectados/calculados por ambos os métodos variaram no décimo do milímetro. As variâncias dos recalques calculados, em ambos os métodos, foram testadas utilizando o teste F de Snedecor ao nível de significância de 5% e constatou-se que a maioria dos resultados passou no teste de hipótese, ou seja, foram determinados com o mesmo grau de precisão.

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“…This happens even with a compensator inside these digital devices (Ko & Ni, 2003). Sunlight and its direction also cause a change in the accuracy of digital instruments, and also climate conditions as wind, moisture (Gassner, 2005), (Pellegrinelli, Furini, Bonfè & Russo, 2013), and temperature (Pašagić & Risović, 2003). Whether it increases or decreases, it affects the efficiency of these instruments (Gucević, J., Delčev, S., & Ogrizović, V., 2011), (Kowalczyk & Rapinski, 2014).…”

Section: Introductionmentioning

confidence: 99%

Surrounding Factors’ Influence on the Accuracy of the Digital Level and Total Station

Alqabas

2020

Journal of Engineering Research is an international, peer-revie

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The digital level (SOKKIA SDL-30) and total station (SOKKIA CX-105) are highlighted as examples of digital surveying instruments. In this study, it is clarified how some surrounding factors can affect their efficiency such as vibration, sunlight, and its direction, temperature, and battery capacity. Through vibration testing as one of these factors ,both the digital level and the total station using the reflector-less were exposed to vibration up to 25 KHZ/Sec, the average and the standard deviations elevation error for the digital level increased by 2 times at 80 m distance , and the average and the standard deviations positioning error increased 3 times for the total station using the reflector-less total at 80 m distance between the instrument and bar code. 64.3% and 51.25% are the increasing ratios in average error for digital level and total station with reflector-less prism by testing the effect of sunlight and its position. The increase in temperature leads to an increase in the average error with 150 % and 66.6% for digital level and reflectorless total station. Finally, the lack of battery efficiency led to a shortage of accuracy of the Surveying Instruments.

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Motorised digital levels: development and applications

Cited by 5 publications

References 4 publications

A flexible and cost-effective compensation method for leveling using large-scale coordinate measuring machines and its application in aircraft digital assembly

A flexible and cost-effective compensation method for leveling using large-scale coordinate measuring machines and its application in aircraft digital assembly

Validação Do Sistema De Automação De Nível Digital Aplicado Na Determinação De Recalques

Surrounding Factors’ Influence on the Accuracy of the Digital Level and Total Station

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