基于hyperworks汽車車架有限元分析外文翻譯-汽車設(shè)計(jì)-閱讀頁
2025-06-06 13:16本頁面
【正文】 first step natural frequency must above 23Hz. The excite frequency of engine idle lie on the number 共 5 頁 第 7 頁 of cylinders and idle rotate speed. For example: (1) four cylinders, idle rotate speed n = 600r/min, the excite frequency of engine idle: f =(600/60)2=20Hz (2) six cylinders, idle rotate speed n = 600r/min, the excite frequency of engine idle: f =(600/60)3=30Hz (3) eight cylinders, idle rotate speed n = 600r/min, the excite frequency of engine idle: f =(600/60)4=40Hz. The range of body frequency above are body assembly, it is said, body in white add the weight of body attachments, such as seats, doors, engine hood, luggage lid etc. Usually we can simulate those attachments by means of rigid elements, in order to considering their effort. Engine hood and luggage lid must have enough torsional stiffness, doors and their outer panel must have enough stiffness, too. The others, such as mirror, steering system, exhaust, had to have reasonable dynamic characteristic, avoid approach body frequency, in the mean time, must stagger the excite frequency of engine idle, too. TABLE 1. EXCELLENT AGREEMENT BETWEEN THEORY AND EXPERIMENT Analysis result Experiment result Agreement % % % % 3. Body Parts and Attachments Analysis Engine hood and luggage lid must have enough torsional stiffness, doors and their outer panel must have enough stiffness, too. The others, such as mirror, steering system, exhaust, had to have reasonable dynamic characteristic, avoid approach body frequency, in the mean time, must stagger the excite frequency of engine idle, too. 4. NVH Analysis We using analysis full automobile nvh characteristic. And we have developed a program to automesh solid 共 5 頁 第 8 頁 element acoustic cavity model. Vehicle design targets are typically established for the following NVH characteristics based on customer and market objectives. These targets are usually expressed in terms of subjective ratings . For interior noise issues, most of the acoustic energy in a typical automobile is below 125 Hz 。 指導(dǎo)教師對(duì)譯文進(jìn)行評(píng)閱時(shí)應(yīng)注意以下幾個(gè)方面：①翻譯的外文文獻(xiàn)與畢業(yè)設(shè)計(jì)（論文）的主題是否高度相關(guān)，并作為外文參考文獻(xiàn)列入畢業(yè)設(shè)計(jì)（論文）的參考文獻(xiàn)；②翻譯的外文文獻(xiàn)字?jǐn)?shù)是否達(dá)到規(guī)定數(shù)量（ 3 000 字以上）；③譯文語言是否準(zhǔn)確、通順、具有
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