基于hyperworks汽車車架有限元分析外文翻譯-汽車設(shè)計(jì)(已改無(wú)錯(cuò)字)
2023-07-06 13:16:08 本頁(yè)面
【正文】 inders, 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(yè) 第 8 頁(yè) 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 。 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
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