隨機波浪下ROV纜索動力響應無因次分析
發(fā)布時間:2017-12-31 01:28
本文關鍵詞:隨機波浪下ROV纜索動力響應無因次分析 出處:《艦船科學技術》2016年15期 論文類型:期刊論文
【摘要】:建立ROV作業(yè)系統(tǒng)垂向一維動力學模型,研究隨機波浪激勵下的動態(tài)響應。利用振動理論對方程無因次處理,得到阻尼比和頻率比與響應關系的微分方程。采用雙參數(shù)的PM波譜作為波浪函數(shù),并對其無因次化。運用龍格庫塔法對隨機波浪和運動方程進行求解,得到纜索最大張力與各參數(shù)的關系,并分析纜索出現(xiàn)松弛的情況,并與諧波激勵的響應作對比。結果表明,隨機激勵下,纜索的最大張力在頻域出現(xiàn)多個峰值,在頻率很大的范圍內保持較大的張力,但峰值張力小于諧波激勵的峰值。
[Abstract]:The vertical one-dimensional dynamic model of ROV operating system is established to study the dynamic response under random wave excitation. The equation is treated dimensionless by vibration theory. The differential equation of the relation between damping ratio and frequency ratio and response is obtained. The two-parameter PM spectrum is used as wave function, and the dimensionless wave spectrum is dimensionless. The Runge-Kutta method is used to solve the stochastic wave and motion equations. The relationship between the maximum tension of the cable and the parameters is obtained, and the relaxation of the cable is analyzed and compared with the response of harmonic excitation. The results show that the maximum tension of the cable appears multiple peaks in frequency domain under random excitation. A large tension is maintained in a wide range of frequencies, but the peak tension is smaller than that of harmonic excitation.
【作者單位】: 上海交通大學海洋工程國家重點實驗室;
【基金】:國家自然科學基金資助項目(51279107)
【分類號】:U674.941
【正文快照】: 隨著海洋資源開發(fā)和海洋科學的不斷發(fā)展,深海無人遙控潛水器(ROV)的應用越來越廣泛,在深海作業(yè)過程中由于纜索斷裂導致ROV丟失的現(xiàn)象時有發(fā)生。母船隨海面波浪做升沉運動,在一定的海況條件下,導致纜索張緊松弛狀態(tài)交替出現(xiàn),從而產生瞬時張力過大的情況,因而分析導致纜索張力過
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