| 摘要: | 為提升國內車輛工業之驗證技術水準，並能快速且客觀地評估車輛的品質，因此本文特地針對路況模擬技術，應用在車輛的加速耐久驗證與台上振動舒適性評估進行研究。首先，在耐久驗證技術方面，主要是希望能找出一種適用於車輛零組件之加速耐久評估手法，研究中採用應變範圍編輯法與軌跡追蹤法，運用三種不同的道路類型與四種不同的損傷保留比例來進行加速耐久試驗的實驗設計。此外，在疲勞壽命的預估分析上，所採用之方法則有應力-壽命法、Eurocode 3規範、BS 5400規範、以及「BS 5400規範+Gurney厚度修正公式」等四種。最後實驗與分析的結果顯示，當破壞發生在目標測試件的銲道處時，「BS 5400規範+Gurney厚度修正公式」是一個最適用的評估方法，其實驗與分析的結果皆能保持在3倍的誤差之內，且不管是應變範圍編輯法與軌跡追蹤法，其亦皆能適用於加速耐久試驗的訊號編輯，並可得到一滿意之結果。 此外，在整車台上振動舒適性評估研究方面，主要是希望能建立一套客觀且快速之實驗室評估系統與流程，目標測試車主要選用市售之三輛不同廠牌休旅車，並依據ISO 2631國際規範中的整體振動總值（OVTV）與座椅隔振性能指標值（SEAT value），進行在不同道路類型、不同駕駛速度等參數下，實車與台上之振動舒適性評估分析。結果顯示，實驗中所有實車及台上試驗所得之車輛振動舒適性結果，其OVTV與SEAT值均呈現相同的趨勢，如此說明了此技術之適用性，並藉此建立了一套客觀的實驗室整車台上振動舒適性評估技術。此外，藉由線性迴歸分析得知，實車及台上試驗關係式為OVTVcorrected bench = 0.9335×OVTVbench (相關係數R2 = 0.9908)，且此修正因子可以有效改善台上試驗結果的精確度，並可將平均誤差由原先的9.75%降為修正後的0.2%。 The rapid development of the vehicle industry has made reducing product development time a major concern. The durability and riding comfort evaluation of ground vehicles were investigated by bench tests. This study seeks to identify a suitable accelerated approach to durability analysis for motorcycle components. This investigation involves field data acquisition, laboratory road load simulation, accelerated durability testing and fatigue life prediction. Two methods, “strain range editing technique” and “racetrack editing technique,” were applied to edit field strain histories for accelerated durability tests. Furthermore, four methods, including the “S-N approach with fatigue property of base metal,” “Eurocode 3 approach,” “BS 5400 approach,” and “BS 5400 approach with Gurney thickness modification,” were employed to assess fatigue life. Three road types and four damage levels were also used. The results demonstrated that the “BS 5400 approach with Gurney thickness modification” is a suitable method of assessing the durability of welded motorcycle components when the fatigue properties of critical points are not available. Both the “strain range editing technique” and “racetrack editing technique” can effectively edit strain histories with the expected quantity of fatigue damage, and demonstrate satisfactory agreement between the experimental data and predicted data. In addition, the ride comfort qualities of three different sport-utility vehicles (SUVs) were determined using sensors, road data acquisition, and road load simulation in the laboratory via road and bench tests. Three road types, three driving speeds and one drive file were used. The point vibration total value and overall vibration total value (OVTV) based on the root mean square of the acceleration in the ISO 2631 standard and the seat effective amplitude transmissibility (SEAT) value were evaluated to compare the ride qualities of three SUVs. During a series of ride comfort tests, the comfort rankings of the target SUVs were equivalent between the road and bench tests. The ride qualities determined from the road and bench tests were strongly correlated; the linear correction factor was derived as OVTVcorrected bench = 0.9335×OVTVbench, and the correlation coefficient, R2, was 0.9908. Furthermore, the mean error of the OVTV for the road and bench tests ranged from 9.75% (original) to 0.2% (after correction). Finally, the procedures for ride comfort evaluation using a laboratory test system (four-poster) are described. These procedures allow for a fast and objective evaluation of ride comfort using bench tests with a correction factor. |
