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track monitoring on Viability of Rice Germplasm Resources and Regeneration under Low Temperature Storage

Agricultural Science & Technology 2008年第1期9卷 43-48页

作者：宁秀呈广西农业科学院种质库

53 rice germplasm resources warehoused during 1981-1984 were regarded as materials to monitor the viability at warehouse time and different years after warehoused. The results showed that seed germination rates of different rice germplasm resources assumed descending trend in storage, with annual decreasing rate between 0.12%-3.05% ; the seed germination rates of most cultivars were above 75% after stored for 26 years; forecasting analysis based on the germination rate of 75% as reference showed a huge difference of safe storage life for different rice germplasm resources, ranging from 12 to 50 years, even longer time. The results suggest that track monitoring on viability and regeneration of rice cultivars is of great importance for germplasm resources conservation.

关键词： Rice germplasm resources Low temperature storage Viability track monitoring

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On the problem of the dynamical reactions of a rolling wheelset to real track irregularities

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Railway Engineering Science 2023年第1期31卷 1-19页

作者： Hans True Lasse Engbo Christiansen Andreas Lindhardt Plesner Andreas Lønstrup Ammitzbøll Bjørn Jerram Dahl DTU Compute Technical University of DenmarkRichard Petersens Plads Building 3242800Kgs.LyngbyDenmark

We investigate numerically the dynamical reactions of a moving wheelset model to real measured track *** background is to examine whether the dynamics are suitable as the input to the inverse problem:determine the true track geometry from measured wheelset dynamical *** is known that the method works well for the vertical position of the rails but the computed lateral position is often *** find that the lateral motion of the wheelset often may differ from the track *** cases are investigated closely but the reasons remain *** the wheelset dynamics reflect the larger(>4-6 mm)aperiodic track disturbances and single large disturbances quite well,this does not seem to be the case for general smaller or periodic track irregularities or sections behind single large *** resulting dynamics of a wheelset to lateral track irregularities are in general not sufficiently accurate to be used as the basis for a description of the track irregularities.

关键词： track monitoring Vehicle dynamical response Inverse problem Numerical analysis Estimate of errors track irregularity

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Feasibility in assessing the dipped rail joint defects through dynamic response of heavy haul locomotive

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Journal of Modern Transportation 2018年第2期26卷 96-106页

作者： Yan Quan Sun Maksym Spiryagin Qing Wu Colin Cole Wei Hua Ma Centre for Railway Engineering Central Queensland University State Key Laboratory of Traction Power Southwest Jiaotong University

The feasibility of monitoring the dipped rail joint defects has been theoretically investigated by simulating a locomotive-mounted acceleration system negoti- ating several types of dipped rail defects. Initially, a comprehensive locomotive-track model was developed using the multi-body dynamics approach. In this model, the locomotive car-body, bogie frames, wheelsets and driving motors are considered as rigid bodies; track modelling was also taken into account. A quantitative relationship between the characteristics （peak-peak values） of the axle box accelerations and the rail defects was determined through simulations. Therefore, the proposed approach, which combines defect analysis and comparisons with theoretical results, will enhance the ability for long-term monitoring and assessment of track systems and provides more informed preventative track maintenance strategies.

关键词： Axle box accelerations track monitoring Dipped rail defects Simulations

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