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試驗機應用之汽車排氣系統波紋管應力試驗

作者：來源：发布日期： 2020.10.21

信息摘要：

試驗機應用之汽車排氣系統波紋管應力試驗

汽車配件，曆來是試驗機廣泛應用的領域。今天要介紹的也是一種汽配産品，名稱是汽車排氣系統波紋管，是我們位于浙江的一家用戶企業生産的産品。如上圖所示。

該公司專業從事汽車進、排氣系統産品的生産與研發，爲通用、福特、現代、長城、中華、神龍等汽車品牌廠家提供配套。主要産品爲汽車排氣系統波紋管（撓性節）、排氣管彎管、EGR冷卻器螺紋管、汽車尾管、法蘭等。

波纹管的测试，主要包含垂直于轴线方向的应力、弹性常数、震动疲劳等项试验。轴向应力测试，需要做轴向拉伸、轴向压缩、垂直于轴向压缩等测试内容。而弹性常数试验，也是通过万能試驗機进行，先缓慢加压，得出压力与位移曲线，之后计算求取弹性常数。而震动疲劳的测试就更为复杂，需要使用相应的試驗機进行震动模拟，从而完成测试。

正是通過這一系列的嚴格測試，才使汽配産品的質量得以保證，以維護汽車整車的安全。

圖爲三思泰捷的万能試驗機在用戶現場服務中。

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The Curate, of course, had heard nothing about the Clockwork man's other performances; he had scarcely heeded the hints thrown out about the possibility of movement in other dimensions. It seemed to him, in the uncertain light of their surroundings, that the Clockwork man's right arm gradually disappeared into space. There was no arm there at all. Afterwards, he remembered a brief moment when the arm had begun to grow vague and transparent; it was moving very rapidly, in some direction, neither up nor down, nor this way or that, but along some shadowy plane. Then it went into nothing, evaporated from view. And just as suddenly, it swung back into the plane of the curate's vision, and the hand at the end of it grasped a silk hat. Good fitting is often not so much a question of skill as of the standard which a workman has fixed in his mind, and to which all that he does will more or less conform. If this standard is one of exactness and precision, all that is performed, whether it be filing, turning, planing, or drawing, will come to this standard. This faculty of mind can be defined no further than to say that it is an aversion to whatever is imperfect, and a love for what [171] is exact and precise. There is no faculty which has so much to do with success in mechanical pursuits, nor is there any trait more susceptible of cultivation. Methodical exactness, reasoning, and persistence are the powers which lead to proficiency in engineering pursuits. I was the only civilian in that road, and the soldiers, with much curiosity, stared at me. Whenever I noticed an officer, I gave an elaborate military salute, and with such an air that the officers, although hesitating at first, did not fail to return the salute. The reformed system of education was to be not only moral and religious but also severely scientific. The place given to mathematics as the foundation of a right intellectual training is most remarkable, and shows how truly Plato apprehended the conditions under which knowledge is acquired and enlarged. Here, as in other respects, he is, more even than Aristotle, the precursor of Auguste Comte. He arranges the mathematical sciences, so far as they then existed, in their logical order; and his remarks on the most general ideas suggested by astronomy read like a divination of rational mechanics. That a recommendation of such studies should be put into the mouth of Socrates is a striking incongruity. The older Plato grew the farther he seems to have advanced from the humanist to the naturalistic point of view; and, had he been willing to confess it, Hippias and Prodicus were the teachers with whom he finally found himself most in sympathy. We are told that when his end began to approach, the dying philosopher was pressed to choose a successor in the headship of the School. The manner in which he did this is289 characteristic of his singular gentleness and unwillingness to give offence. It was understood that the choice must lie between his two most distinguished pupils, Theophrastus of Lesbos, and Eudêmus of Rhodes. Aristotle asked for specimens of the wine grown in those islands. He first essayed the Rhodian vintage, and praised it highly, but remarked after tasting the other, ‘The Lesbian is sweeter,’ thus revealing his preference for Theophrastus, who accordingly reigned over the Lyceum in his stead.179 Abibulla saw them off with great deference and a contrite air, and watched their retreat; then, as[Pg 260] I was about to send him to despatch the message, he was indignant. The police! What could they do to a sahib like me? It was all very well to frighten poor folks—it was a sin to waste money in asking for a reply which I should never be called upon to show—and so he went on, till I made up my mind to think no more of the matter. 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