例句與造句

1. None but is the test spectrum abundant and controllable , it is possible to simulate the stresses environment needed for exposing weakness of the product . based on summarizing the present status of the vibration test and vibration environment simulation technology in the world , the topic of simulation of super - gaussian random vibration environment with controllable frequency spectrum and its applications in reliability enhancement testing is put forward . the main content and conclusions of the dissertation are as following : 1
   本文在綜述國內(nèi)外振動試驗(yàn)技術(shù)和振動環(huán)境模擬技術(shù)的基礎(chǔ)上,引出“頻譜可控的超高斯隨機(jī)振動環(huán)境模擬技術(shù)及其在可靠性強(qiáng)化試驗(yàn)中的應(yīng)用”這一主題,并緊緊圍繞該主題開展了如下研究工作: 1 .全面分析了振動激勵(lì)的功率譜密度量級、幅值分布、帶寬以及試件結(jié)構(gòu)的固有頻率、阻尼比等因素對疲勞損傷累積的強(qiáng)化效應(yīng),提出振動強(qiáng)化試驗(yàn)激勵(lì)信號應(yīng)具備的重要特性:頻譜可控和超高斯,確立了本文的研究主題和方向。
2. It's difficult to find random vibration environment in a sentence. 用random vibration environment造句挺難的