The current research of wheel force transducer （WFT） mainly focuses on test signal processing and decoupling methods based on signal itself, while the WFT structure optimization research related to decreasing the ma...The current research of wheel force transducer （WFT） mainly focuses on test signal processing and decoupling methods based on signal itself, while the WFT structure optimization research related to decreasing the mass and increase the natural frequency and comprehen- sive sensitivity is not enough. In order to improve the WFT test accuracy, a structure optimization method based on natural frequency and comprehensive sensitivity indicators is put forward. The WPT with 8-beam elastic body is used for the finite element modeling （FEM）, in which the fol- lowing variations are taken into consideration： the con- nection type of elastic body with modified rim, the number of connection holes, and the respects of strain beam including the shape, the cross sectional area and the length, etc.. The test results shows that the natural frequency of the connecting block type is increased by 65.5% compared with the connecting seat type of elastic body ＆ modified rim, and the main channel sensitivity is improved as well. The results show that the connecting block type will achieve the best comprehensive performance when the number of connecting holes between the elastic body and the modified rim is 20. And the thinner and longer strain beam with smaller cross section area is preferable within the scope of elastic body mechanical strength. This research proposes a novel structure optimization method for WFT which contributes to improve the measurement performance of WFT.展开更多
Improving the supply-demand balance of ecosystem services(SDBES)from the perspective of land use is essential for managing regional ecosystem and realizing sustainable development.By combining land use with the supply...Improving the supply-demand balance of ecosystem services(SDBES)from the perspective of land use is essential for managing regional ecosystem and realizing sustainable development.By combining land use with the supply and demand of ecosystem services(SDES),a technical framework for defining land use threshold and optimizing its structure to improve the SDBES state was constructed and applied to a practical case.The spatial pattern of supply and demand of each ES in Lancang county was distinctly heterogeneous,with significant differences in SDES across different land use types.Strong spatial heterogeneity existed in the ESDR of each ES at the grid scale,and the areas of deficit were ranked as carbon sequestration>water conservation>habitat quality>food production.The structure of dry land,paddy field,tea,evergreen broad-leaved forest,grassland,urban construction land,and industrial and mining construction land were the focus of land use optimization.Based on the land use area thresholds under the SDBES,the optimal land use structure for maximizing comprehensive benefits contributed to a balanced relationship between SDES and promoted sustainable regional development.The study provides a new perspective and method for improving the SDBES state,alleviating land conflicts,and managing ecological environment.展开更多
基金Supported by Anhui Provincal Natural Science Foundation of China (Grant No. 1608085ME109)National Natural Science Foundation of China (Grant Nos. 51675005, 51105001)State Key Laboratory of Automotive Safety and Energy, Tsinghua University, China (Grant No. KF14022)
文摘The current research of wheel force transducer （WFT） mainly focuses on test signal processing and decoupling methods based on signal itself, while the WFT structure optimization research related to decreasing the mass and increase the natural frequency and comprehen- sive sensitivity is not enough. In order to improve the WFT test accuracy, a structure optimization method based on natural frequency and comprehensive sensitivity indicators is put forward. The WPT with 8-beam elastic body is used for the finite element modeling （FEM）, in which the fol- lowing variations are taken into consideration： the con- nection type of elastic body with modified rim, the number of connection holes, and the respects of strain beam including the shape, the cross sectional area and the length, etc.. The test results shows that the natural frequency of the connecting block type is increased by 65.5% compared with the connecting seat type of elastic body ＆ modified rim, and the main channel sensitivity is improved as well. The results show that the connecting block type will achieve the best comprehensive performance when the number of connecting holes between the elastic body and the modified rim is 20. And the thinner and longer strain beam with smaller cross section area is preferable within the scope of elastic body mechanical strength. This research proposes a novel structure optimization method for WFT which contributes to improve the measurement performance of WFT.
基金National Natural Science Foundation of China,No.42061052,No.41361020,No.40961031Joint Fund of Yunnan Provincial Science and Technology Department and Yunnan University,No.2018FY001-017+2 种基金Construction Project of Graduate Tutor Team in Yunnan Province,No.C176230200Postgraduate Innovative Research Project of Yunnan University,No.2020Z46,No.2021T008,No.KC-22222260Project of Joint Training Base for Postgraduate Integration Between Industry and Education in Yunnan Province,No.CZ22622203-2022-29。
文摘Improving the supply-demand balance of ecosystem services(SDBES)from the perspective of land use is essential for managing regional ecosystem and realizing sustainable development.By combining land use with the supply and demand of ecosystem services(SDES),a technical framework for defining land use threshold and optimizing its structure to improve the SDBES state was constructed and applied to a practical case.The spatial pattern of supply and demand of each ES in Lancang county was distinctly heterogeneous,with significant differences in SDES across different land use types.Strong spatial heterogeneity existed in the ESDR of each ES at the grid scale,and the areas of deficit were ranked as carbon sequestration>water conservation>habitat quality>food production.The structure of dry land,paddy field,tea,evergreen broad-leaved forest,grassland,urban construction land,and industrial and mining construction land were the focus of land use optimization.Based on the land use area thresholds under the SDBES,the optimal land use structure for maximizing comprehensive benefits contributed to a balanced relationship between SDES and promoted sustainable regional development.The study provides a new perspective and method for improving the SDBES state,alleviating land conflicts,and managing ecological environment.
