Measuring density and Young’s modulus of a log through the vibration test without measuring its weight

Kubojima, Yoshitaka; Sonoda, Satomi; Kobayashi, Hideo

doi:10.1186/s10086-020-01929-5

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…(3) Maintain the existing accountability intensity and use of value-added models, but value-added evaluation should be combined with other evaluation methods [31].…”

Section: Discussionmentioning

confidence: 99%

The Implementation and Controversy of VAM in American Primary and Secondary Schools

2022

JERP

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Recently, China discussed value-added evaluation(VAM), result evaluation, process evaluation and comprehensive evaluation in the same position. Which not only clarified the direction of education reform in the new era, but also indicated that exploring value-added evaluation has become an important part of the national education strategy. Therefore, the exploration of value-added evaluation has academic value and meets the needs of The Times. This paper analyzes the policy background and existing controversies of the application of value-added method in the evaluation of primary and secondary school teachers in the United States. Finding a key problem facing the ongoing reform of the evaluation of primary and secondary school teachers in the United States is the evaluation method. In this regard, states in the United States are trying to provide value-added evaluation(VAM) data to teachers as a means to support teacher professional development and improvement, and turn the evaluation system to formative evaluation. The purpose of this paper is to make domestic scholars understand the latest progress of teacher value-added evaluation in American education research andpractice, so as to provide some enlightenment for China.

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“…(3) Maintain the existing accountability intensity and use of value-added models, but value-added evaluation should be combined with other evaluation methods [31].…”

Section: Discussionmentioning

confidence: 99%

The Implementation and Controversy of VAM in American Primary and Secondary Schools

2022

JERP

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“…In the authors' previous study, a method was proposed for measuring the mass of wood lumber in piles using a vibration test without weighing the wood lumber (Kubojima et al 2020a). The specimen mass was estimated without weighing it using the method based on the difference of the resonance frequency when a concentrated mass is added to and subtracted from wood (Skrinar 2002;T€ urker and Bayraktar 2008;Kubojima and Sonoda 2015;Matsubara et al 2015;Kubojima et al 2016;Matsubara et al 2016;Sonoda et al 2016;Kubojima et al 2017a;Kubojima et al 2017b;Kubojima et al 2018a;Kubojima et al 2018b;Kubojima et al 2019;Kubojima et al 2020a;Kubojima et al 2020b;Kubojima et al 2021). Hereafter, this method is referred to as the "vibration method with additional mass (VAM).…”

Section: Introductionmentioning

confidence: 99%

Mass Estimation of Piled Round Bars through Vibration Tests

Kubojima

Sonoda²,

Kobayashi³

2021

WFS

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A simple method was developed to estimate the mass of each piled round bar using a vibration test. Specimens used in the tests were Japanese cedar (Cryptomeria japonica D. Don) round bars (diameter 5 180 mm, length 5 2000 mm) with a pith and a back split. Vibration tests were conducted, and the effect of sticker positions on the vibration test was investigated. The vibration tests were conducted for each piled round bar and the estimation accuracy of the vibration method with additional mass (VAM) was examined. By placing the round bar on the stickers, the resonance frequency of the longitudinal vibration was stable while that of the bending vibration decreased with the increase in the distance between the sticker and the specimen end and stabilized when this distance was greater than or equal to 0.2 l (l: specimen length). When the round bars were piled with no stickers, the bending resonance frequency could not be identified and the VAM estimation accuracy of the longitudinal vibration depended on the specimens. The estimation accuracy of VAM for the longitudinal vibration of the piled round bars while using stickers made of wood and rubber was superior to that without stickers. The estimation accuracy of VAM for the bending vibration was sufficiently high. These results were attributed to the reduction of the vibration restraint by the stickers and the contact between adjacent round bars.

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Estimation of mass and moisture content of flat square lumber in a stack during air-drying process by the vibration method with additional mass

Kubojima,

Sonoda,

Kato

2024

J Wood Sci

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A vibration test to measure the mass of a specimen without weighing it using the difference between the resonance frequency with an additional mass and that without it (vibration method with additional mass, VAM) was applied to Japanese cedar flat square lumber with dimensions of 210 mm × 135 mm × 3000 mm both with and without a pith in the process of air-drying. The longitudinal and bending vibration tests were performed on the specimens with and without an additional mass. The accuracy of VAM that was expressed by the estimated mass by VAM to the measured mass (MVAM/M0) was sufficiently high throughout the air-drying process. The accuracy of VAM for the longitudinal vibration was higher than that for the bending vibration. The moisture content based on the estimated mass by VAM was in the expected range.

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Measuring density and Young’s modulus of a log through the vibration test without measuring its weight

Cited by 3 publications

References 13 publications

The Implementation and Controversy of VAM in American Primary and Secondary Schools

The Implementation and Controversy of VAM in American Primary and Secondary Schools

Mass Estimation of Piled Round Bars through Vibration Tests

Estimation of mass and moisture content of flat square lumber in a stack during air-drying process by the vibration method with additional mass

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