基于hyperworks汽車車架有限元分析外文翻譯-汽車設(shè)計(jì)(完整版)
【正文】 % % 發(fā)動(dòng)機(jī)罩和行李箱蓋必須有足夠的抗扭剛度，門和外板 也 必須有足夠的剛度， 其他，例如 鏡 子、 轉(zhuǎn)向系統(tǒng) 、 排氣 、 必須有合理的動(dòng)態(tài)特性， 同時(shí) 避免 車架頻率， 因此 必須錯(cuò)開發(fā)動(dòng)機(jī)激發(fā)頻率 。實(shí)現(xiàn) 這一目標(biāo) 是在 早期發(fā)展階 段的設(shè)計(jì)工作，數(shù)值模擬的工具越來越多地使用的代名詞。如在汽車底盤設(shè)計(jì)中，我們可能要調(diào)查面板厚度變化 、車身 共振頻率的變化。 Noise and vibration concerns below 125 Hz must usually be dealt with by major structural changes such as additional cross members, reinforcements, and beam section sizes. Above 125 Hz, vehicle interior noise is usually the main concern and can be dealt with by local design modifications such as panel beads and damping treatments. 5. Crashworthiness Simulation and Design A main goal in automotive development is to achieve an optimum in passive safety, . to protect the car passengers during a crash as well as possible. This goal leads to increasing safety design efforts in the early development phases, synonymous with an increasing use of numerical simulation tools. The successful car body crashworthiness simulations lead to a new partnership between test and analysis teams with the goal to reduce cost and delay of new car model design. Except simulate front and side crash, extended simulation, such as occupant, airbags, steering wheel design, seat and seat belt design, kneebolster design, bumper design, etc. In our pany, we have simulated full frontal rigid barrier. Sensitivity and Optimization The aim of the car design is to get an optimal construction under different constraints. Design sensitivity analysis putes the rates of change of structural responses with respect to changes in design parameters. These design parameters are usually referred to as design variables and can be used to represent shell thickness, beam cross sectional dimensions, journal bearing sizes, and so on. Design optimization analysis is a formal plan or algorithm, that is used to search for a “best” design. Such as in automotive chassis design, we may want to investigate changes in cabin resonant frequencies given changes in panel thickness. These 共 5 頁 第 9 頁 rates of change are called design sensitivity coefficients. once these rates of change are known, optimization analysis can find the optimal set of panel thickness which yield the lowest level of cabin resonant frequencies. The other example: one part of vehicle’s frame structure was found to be overst
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