消振發動機 的英文怎麼說
中文拼音 [xiāozhènfādòngjī]
消振發動機
英文
vibration-free engine-
It supports the aircraft during parking and endures the loads during ground maneuvers. most of the vertical and horizontal kinetic energy are absorbed and dissipated by landing gear. it plays an extreme important role in preventing the airframe from vibration and excessive impact forces, improving passenger comfortable characteristics and increasing aircraft flight safety
飛機起落架作為飛機結構的一個重要部件，承受著飛機與地面接觸時產生的靜、動載荷，吸收和消耗飛機在著陸撞擊、跑道滑行等地面運動時所產生的能量，在減緩飛機發生振動，降低飛機地面載荷，提高乘員舒適性，保障飛機飛行安全等方面發揮著極其重要的作用。The development and disappearance of the acoustic oscillations are influenced by the nozzle throat size and open - time of the plug
計算結果表明，這些影響包括了聲振的強度、阻尼和頻率，發動機點火后噴管喉部尺寸和堵蓋打開的時間影響到振蕩波的發展和消失。Through the deep study of f. d. demello dynamic model of electromechanical transition and synchronous generator theory, we proposed a new control strategy of excitation device that can eliminate the negative - damping phenomenon, which is directly against the cause of producing negative - damping represented as low frequency oscillation in the system
通過深入研究f . d . demello機電暫態的動力學模型以及同步發電機理論，針對系統產生負阻尼即低頻振蕩的原因，我們提出了一種新的可消除負阻尼現象的勵磁控制策略。The dissertation refers to comparatively full literatures in the field of vsc, and the development history and characteristics of vsc are summarized, and the elementary concepts, elementary definitions, elementary properties, elementary principles and design methods are particularly introduced, and the causes of the chattering phenomenon are systematically analysed, and the study status of the chattering phenomenon and the main methods to eliminate the chattering are elaborated. for the deficiencies of traditionary methods, three improved methods are developed, which are improved exponent reaching law solution, variable boundary layer solution and the solution by adding an auxiliary continuous control term. for uncertain linear systems, an adaptive fuzzy integral variable structure control stategy ( afivsc ) is put forward to eliminate the chattering around the sliding plane, which introduces fuzzy logic to soften the non - linear discontinuous sig nal in the control variable and utilizes adaptive theory to adjust output membership function according to how much the uncertainty of the system is
比較全面地查閱了關于變結構控制理論的文獻，總結了滑模變結構控制的發展歷史和特點，詳細介紹了變結構控制的基本概念、基本定義、基本性質、基本原理以及設計方法；系統分析了變結構控制系統抖振產生的機理，並闡述了國內外目前對抖振問題的研究現狀以及消除抖振的主要方法；針對傳統抑制和消除抖振方法的不足，改進了傳統方法，得到了三種新的消除抖振的方法? ?即改進的指數趨近律法、可變邊界層法和附加連續項法；針對不確定性線性系統，在變結構控制策略中引入模糊邏輯和自適應理論來消除滑動平面上的抖振，提出了一種自適應模糊積分變結構控制方案（ afivsc ） ，利用模糊邏輯來柔化控制量中非線性不連續部分，採用自適應理論，根據系統不確定性大小在線調整模糊輸出量的隸屬函數，另外，鑒于模糊控制本質上是有靜差的，所以本文選擇了帶積分項的切換函數，由於積分項的存在使系統較正為無靜差系統。First we collect signals by shake and infrared temperature sensor, transfer them to computer by a / d instrument, dispel zero excursion of sensor and in - linearity of a / d transformation, save them in the form of data file. then transfer them to matlab, analyze and dispose by wavelet function and toolbox. by lot of experiments and data analysis we find distinct change of the character in different fault states
然後，我們在現場對砂光機進行實驗，利用振動及紅外線溫度傳感器現場實時採集信號，通過a / d采樣卡送入計算機中，採用逆向建模的新方法來消除傳感器零漂及a / d轉換的非線性，再以數據文件形式保存，然後在matlab中調用數據文件，應用小波函數及工具箱對其進行處理分析，經過大量的實驗及數據分析發現在不同的故障狀態下，特徵量有明顯變化。Vibration free engine
消振式發動機The impact on the muffler performance is realized by the high - speed pulsation gas flow, which regenerates noises and strikes the acoustic elements of the muffler such as the pipe run, the body case and the separator plate to arouse the vibration radiated noise
氣流影響消聲器性能的主要原因是發動機排氣的高速脈動氣流再生噪聲，其次是這種氣流會沖擊消聲器的管路、殼體、隔板等聲學元件，進而激發振動輻射噪聲。The crank - set of motor is a special rotate machine, in which the inertia combined - force caused by running crank will tremble the whole automobile along with rack. therefore, it has practical meaning to locate the inertia combined - force and eliminating its influence on whole system, which can reduce the uncomfortable feeling of driver, also promote entire performance
發動機曲柄連桿是一種特殊的旋轉機械，其工作時產生的慣性力的合力會使發動機工作時產生振動，這個振動傳遞到機架上，引起整車的振動，從而使駕駛者感到不適，同時對整車性能產生不利影響，因此，找出並消除這個慣性力的合力對于提高車輛的整體性能有著重要意義。The main purpose is to investigate different fault mechanism in rotating machinery, such as imbalance, misalignment, or imbalance with misalignment conditions, etc
其目的是探討旋轉機械在轉動不平衡、偏心、基座松動及綜合性等不同類型故障發生時，所生成的非穩態振動消息。In order to carry out the acoustic and aerodynamics performances tests, seven resonators are designed and made, and a specialized engine intake silencer and exhaust silencers test bench was designed. the tests and analysis are performed as well. on the basis of the intake noise spectrum of sc7080a, a three - parallel - connected resonant silencer is designed, and that has efficiently controlled the acceleration noise of sc7080a
在此基礎上設計並加工了兩類七個共振型進氣消聲器，研製了發動機進排氣消聲器性能測試實驗臺，開發了發動機進排氣消聲器聲學性能測試軟體，並在該實驗臺上測試了所設計的進氣消聲器靜態工況下的傳聲損失，從實驗的角度研究了共振腔的尺寸、形狀對其共振頻率的影響及其趨勢。The research and the application shows that the resonator geometrical parameter has effect on its resonant frequency, and the one dimension ( 1 - d ) model can predict the frequency accurately. therefore, if an engine intake noise spectrum is known, one can design a helmholtz resonant silencer to control the intake noise
一維軸向傳播理論能夠準確預測共振腔的共振頻率，從而為正確設計出針對發動機進氣噪聲頻率特性的helmholtz共振型進氣消聲器提供依據，達到有效控制發動機進氣噪聲的目的。The main achievements are as follows : based on the research of principles and methods of data collection and processing, the dissertation put forward using vxd to accomplish break response of hardware and utilizing control principle of dma to realize data transfer of high speed. so the dissertation conquers the defect of bad real - time characteristic of windows because of multitask function and message mapping and accomplish real - time of collection and analysis. and the dissertation develops the system of signal collection and analysis to test vibration and noise and analyze structure dynamics
主要工作及創造性成果如下：提出了利用vxd來實現硬體中斷響應，並運用dma控制原理實現了高速數據傳輸，克服了windows操作系統多任務功能及消息映射機制所帶來的實時性差的弊端，從而實現採集和分析的實時性，開發出適用於振動噪聲測試、結構動力學分析和機械在線檢測的信號採集分析系統。分享友人