frequency of damage 中文意思是什麼
frequency of damage
解釋
故障頻度-
To avoid the retardation of flood water, improve the discharging conditions and reduce flooding frequency and flowage damage on flood retarding basins, huai river commission made a decision to adjust and regulate the middle courses of huai river. the authorial thesis is based on the main part of huai river flood - protection planning, i. e., the flood - protection planning of huai rivers middle courses. author of thesis participated in the drawing up and the administrating of the plan
為了擺脫中、小洪水行洪不暢，減少行、蓄洪區在中、小洪水條件下的行洪機遇，淮河水利委員會在淮河流域總體防洪規劃中，決定重點解決淮干中遊河道防洪問題，論文作者親自參與制定了淮河中、上遊河道防洪規劃制定工作，並組織、領導規劃中各項骨幹工程的施工建設，前後數年之久。 -
Abstract : this paper analyzes causal factors of flood in the middle reaches of changjiang river. due to neglection of environmental management, soil erosion in the upper and middle reaches of the changjiag river, lake sedimentation, large - scale reclamation of marshes, the flood regulation capacity of the lake was descended, and flood stage was risen and prolonged. consequently more and more river levees and lake dikes were reinforced almost every year to prevent the disasters, which made flood level go up and flood period last for more days. the frequency of flood and waterlogging disasters rose and their damage was enlarged. several proposals for flood prevention including agricultural modernization are put forward
文摘: 1998年長江大洪水后開始實施的「平垸行洪，退田還湖」的土地利用調整方案，從長遠來說應尋求農業安全且收入逐漸提高條件下的土地利用，長江中游地區應積極推進農業現代化，提高農業勞動生產率，轉移，減少分蓄洪區的人口，移民建鎮，對區內的土地要促進其規模經營，由優秀的有文化的農民經營，平時只有少量的直接從事農業生產的經營管理人員，農忙時則大量地使用季節性合同工或實現機械化，大洪水時退田還湖，減輕長江幹流大洪水的壓力，減少分洪與特大洪災時的損失，這樣還可促進避洪、冬季農業等的發展，也有利於長江中上游地區陡坡耕地的退耕還林，還可在糧食充足時進行休耕，在旱災、糧食緊張時擴大糧食生產? -
The frequency curve of transverse distribution of the wheel track on divided ways reveals that the frazzled damage of highly channelizing expressway cement concrete pavement largely occurs in the peak range of distribution curve of the wheel track
摘要分車道行駛輪跡橫向分佈頻率曲線顯示，渠化程度較高的高速公路水泥混凝土路面磨損破壞主要集中在行車道輪跡峰值范圍。 -
The other research purpose is to discover characteristic information and reliable methods of reflecting spinal cord damage. due to typical damage indicators, amplitude and latent period, have bugs such as limited information and weak stabilities, this project recommends applying time - frequency analysis to monitoring spinal cord function. through analysing and comparing typical signal with stft and cwt, it is proved indicators under time - frequency distribution can be better in reflecting signal changes, espcially the wavelet transformation
針對目前ep監測中判定脊髓損傷的指標（波幅和潛伏期）存在信息量相對較小、穩定性較差的缺陷，本課題提出利用時頻分析技術對術中脊髓功能監護進行研究，通過短時傅立葉變換和小波變換分析和比較典型信號的時頻分佈，證明時頻特徵參數能更有效的提取信號的變化信息。 -
In this paper, we design a new film stack by use of multi - frequency design idea, which decrease the film thickness of high refraction layers greatly, and the damage threshold of it will be improved hopefully. and at the base of this film stack, by optimizing the film thickness of several outmost layers, we design the hr film at 45 incidence for 632. 8nm and 1315nm with 180 ? or 90 phase retardance at 1315nm
隨著高功率coil輸出功率的進一步提高，傳統的設計膜系已逐漸不能滿足需要，為此我們利用倍頻的沒計思想，設計出了一種新的高反射膜系，與傳統的設計膜系相比，此膜系大大降低了高折射率層的厚度，使得膜系的損傷閩值有望得到極大提高。 -
The whole thesis consists of three parts. firstly, we establish the meteorological disaster database of jilin province and deduce the statistic frequency of the main meteorological disaster on the base of choosed meteorological disaster index. the spatial distribution law and time variation of drought, flood and low temperature cold damage are concluded with the gis technology
全文主要由三部分組成：首先，在選擇氣象災害指標的基礎上，建立了吉林省氣象災害數據庫，統計主要農業氣象災害的發生頻率，然後利用gis技術得到吉林省旱澇、低溫冷害的空間分佈規律和時間變化。 -
The main contents of this paper is according to the structural characteristic of forced vibration, making use of the varying quantity data of free frequency of two different physical cantilever beam on the structural damage experiment basis, then using the bp network, genetic algorithm and the genetic bp algorithm to build up relation model between position, extent of structural damnification, and the varying quantity of free frequency
其主要內容就是根據結構受迫振動特性，利用試驗測得兩根不同物理性質懸臂梁在受損傷產生裂紋前後的固有頻率改變量，使用bp網路、遺傳演算法、遺傳bp演算法，建立了結構損傷的位置、程度與結構固有頻率損傷前後改變量之間的關系模型。 -
Methods of structural damage detection based on frequency change
基於頻率變化的結構損傷識別方法 -
Experimental study on that 532nm 、 1064nm 、 1319nm 5khz frequency pw laser irradiate the ccd respectively. with the data of experiment, the thresholds of laser power density that induce ccd saturation, crosstalk and irreparability damage were calculated. the phenomenon that 532nm 5khz laser can induce part of ccd functional damage but absolutely damage was found
根據實驗數據計算了532nm 、 1064nm高重頻脈沖激光使ccd出現飽和、串擾以及被破壞的功率密度閾值;實驗發現一定功率密度的高重頻532nm脈沖激光可以使ccd局部損傷而不致整體破壞;實驗進一步證實了1319nm激光不能使可見光ccd產生響應。 -
Taking natural frequency and mode as damage principle, damage detection is studied as optimal problem based on genetic algorithm, and damage indices, symmetry and precision in the damage detection is discussed. numerical simulation of the damage detection of offshore platforms using genetic algorithm proves the feasibility of genetic algorithm in damage detection of large structure ; program all the process of genetic algorithm in damage detection into damage detection system
以實測的固有頻率和振型為診斷依據，將損傷診斷問題歸結為優化問題，採用遺傳演算法加以研究，以10單元固端梁的損傷診斷為基礎，討論了診斷中出現的損傷指標，損傷對稱性和變量精度等問題；將遺傳演算法的損傷診斷應用於海洋平臺，驗證了遺傳演算法用於大型結構損傷診斷的可能性；並用matlab將遺傳演算法應用於損傷診斷的全過程編製成損傷診斷系統。 -
Bridge can be detected by the transformation of structure mode parameters with the modern technology of signal test. the vibration frequency is obtained easily in the measure, but it is n ' t sensitive to the transformation of mass and rigidity. so it is difficult to identify by test system when the damage of structure reach to the limit damage degree
在實際的工程測量中最容易獲取的結構模態參數就是振動頻率，但是振動頻率對質量、剛度的變化具有弱靈敏性，這使得即使結構的破損程度達到了極限破損程度，振動頻率的變化也很難被測試系統識別。 -
Damage diagnosis of structures based on changes in frequency
基於頻率改變的結構損傷診斷方法 -
Basing on rc simple supported beam the study of the paper is modal analysis using the finite unit software ansys, and the relationship among the transformation of vibration frequency, value of attached load, position of attached load, degree of damage, position of damage is discussed
本文利用大型有限元軟體ansys針對工程常用的鋼筋混凝土梁橋進行了模態分析，討論了振動頻率的變化與附加荷載大小、附加荷載位置、破損程度、破損位置之間的關系，研究了混凝土梁橋從完整階段到破壞階段振動頻率的變化規律。 -
Abstract : an analysis on the damage of flame arrester of oil tank has been made from its structure as well as daily care. countermeasures against its disability have been presented, that is, casting the two semi - casing into one piece, leaving out the intermediat flanges, thickening the casing, and increasing the casting round - angle between the flanges and casing. in this way, the strength of casing can be enhance and local stress will be decreased. in addition, in order to enlongate the service life, the operating frequency of flame arrester should be properly reduced in daily care
文摘:從設計結構及維護保養的角度分析了儲油罐阻火器損壞的原因，並提出了相應的改進措施，即在結構方面可以將阻火器外殼鑄為一體，省去中間法蘭，增加殼體厚度，加大法蘭與殼體之間的鑄造圓角，以增加強度減少局部應力:在維護保養方面，應適當減少操作次數，延長阻火器的使用壽命。 -
一 、 the research topic and the significance of the topic china is a country with high frequency of catastrophic events. the average economic damage causing by catastrophic events in china was over rmb 100 billion per year in1990s
一、論文選題與研究意義我國是個自然災害頻發國家，據聯合國的統計資料表明:二十世紀以來，全世界54個最嚴重的自然災害事件中有8個發生在中國。 -
The study state of art and development trend of structural damage identification research is simply summarized in this paper. hilbert - huang transform ( hht ) is applied to the damage identification and intrinsic frequency confirmation of time - variable structures. furthermore, a kind of inverse calculation is presented to calculate structural stiffness. this method can solve three main problems : the time that damage occurred, the location and the degree of damage
本文簡要總結了結構損傷識別領域的研究現狀和趨勢，圍繞損傷引起固有頻率變化這個特徵，將希爾伯特?黃變換（ hht ）應用於時變結構的損傷識別和損傷前後固有頻率確定上，並結合牛頓迭代法，對結構剛度進行反演計算，從而解決結構損傷識別領域所關注的三個主要問題:損傷發生時間、損傷位置以及損傷的程度。 -
The use of the batten interpolation for modal parameter in the curvature modal and flexibility difference curvature method can solve the contradiction between decreasing measure points and the guarantee of identification precision ; the identification program has also been developed in matlab : as long as the former 3 step vibration shape and frequency are input, the value and the graphic representation of damage identification will be obtained by flexibility difference curvature method
本文應用曲率模態法、柔度差值曲率法當中，對模態參數用樣條插值，較好地解決了減少測點與保證識別精度的矛盾；在matlab軟體中開發了識別程序：只需輸入前三階振型和頻率，即可由柔度差值曲率法給出損傷識別的圖示與數值結果。 -
By using of the frequency, which is more accurate than the mode shape, the fully nonlinear identification algorithm using the frequency data was coupled with the flexibility projection method to estimate the magnitude of damage in a structure
將結構損傷識別的完全非線性演算法與柔度投影法結合，利用頻率觀測數據較為精確的特點，使用混合法研究了數據誤差條件下的損傷識別問題。 -
Numerical analysis of the effect of damage caused by shock on natural frequency of floating raft
沖擊損傷對浮筏隔振系統固有頻率影響的數值分析 -
Based on the theories of chemistry and ahsking structure, the corrosion and damage mechanism of externally prestressed tendons was addressed and the impact of vibration frequency of externally prestressed tendons on normal use of concrete beams was analyzed
摘要運用化學及結構振動原理，闡述了體外預應力筋腐蝕破壞機理，分析了體外預應力筋振動頻率對梁正常使用的影響。
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