非低振動 的英文怎麼說
中文拼音 [fēidīzhèndòng]
非低振動
英文
anharmonic oscillation-
Compared with traditional mechanical and optic gyros, hrg has such advantages as no high speed circumvolving or moving parts in structure, no warm - up time and short start - up time, wide signal band in frequency, low excursion noises, great endurance in over loading, nuclear radiation and short time power off, small bulk, light weight, low power cost and long life, which is suitable for space applications
與傳統的機械陀螺和光學陀螺相比，半球諧振陀螺具有如下優勢:結構上無高速轉子、無活動部件;不需預熱，啟動時間短;信號頻帶寬，漂移噪聲低;能承受大的機動過載;抗核輻射，並可經受短時間電源中斷的影響;體積小，重量輕，功耗低，壽命長，非常適合空間應用。At low frequencies, such as 10 per sec., pulsation is sensed rather than vibration.
在低頻率（譬如每秒十次）時，所感覺到的是脈沖而非振動。The planet vibrates at a very low frequency ? too low for our ears to pick up, but enough that geologists get an annoying background noise on their sensitive instruments
行星振動的頻率很低，我們耳朵很難分辨出，但在地理學家靈敏的儀器上卻會收到一個非常令人討厭的背景噪音。At present, surge control method for centrifugal compressor being used is commonly by least - flow method. it can ’ t make compressor working within operating condition area, sometimes starts the surge control system earlier, which will waste energy sources and depress economy benefit. even, its control system commonly consists of simulation instrument, can ’ t modify the changing surge curve of compressor in time and can ’ t control nonlinear surge curve preferably
目前，在用的離心壓縮機的防喘振方法一般採用最小流量法，它不能充分使壓縮機工作在其工況區，往往過早起動防喘振系統，浪費了能源，降低了經濟效益。且控制系統一般採用模擬儀表構成，在壓縮機的喘振線發生變化時不能及時修正，對非線性的喘振線不能較好的實施控制。Compared with non - slung - load flight, additional aerodynamic load, gravity load should be considered in the slung - load system. so the moment to the gravity center, flight mode and the natural frequency will change
直升機吊掛飛行，與直升機非吊掛飛行狀態相比，增加了新的氣動載荷、重力載荷，和因此產生的對直升機重心的力矩，其飛行運動模式、低頻振蕩固有頻率均發生改變。The numerical results indicate that the deformation within the solid inner core is very small. however, in the fluid outer core, the changes of the displacement with relatively low spherical harmonic degree ( n < 10 ) is very complicated via the radius, due to the resonance near the eigenfrequenies of the core long - period oscillations. while the spherical harmonic degree of the loading is larger than 10, the deformation and the gravitational perturbation in the core are very small, and the earth ' s deformation response is dominantly represented as the radial displacement in the elastic mantle
研究了地球在日月引潮力和表面負荷作用下的形變特徵，數值計算結果表明，在固體內核中的形變很小，由於在長周期核模本徵頻率附近的共振，液核中低階（ n 10 ）位移隨半徑的變化非常復雜，當負荷階數超過10時，地核中的形變和擾動位都很小，地球的響應主要表現為彈性地幔中的徑向位移，且隨深度增加急劇減弱，地表負荷love數與信號頻率的依賴關系很弱，給出了體潮love數計算的一種有效的近似處理方案。In light of the limitation of fast fourier transform ( fft ) for the method of traditional spectrum analysis to analyze the unsteady signal, wavelet and wavelet analysis are made for the typical unsteady process signal of starting up and shut down with the good characteristic of simultaneous localization in both the time and the frequency domains based on the field test on the vibration of two - row placed units in lijiaxia hydropower station, in which the signal is decomposed into different frequency band, and then the weak signal is caught and the dominant frequency is picked up for the analysis of the vibration source
摘要基於李家峽水電站雙排機組振動的現場試驗研究，並且針對傳統頻譜分析方法傅立葉變換（ fft ）對于非平穩信號已力不從心這一缺陷，利用小波分析方法在時域和頻域上同時具有良好的局部化性質，通過對開停機這一典型非平穩過程信號進行小波及小波包分析，將其分解到不同頻帶內，獲取微弱信息和提取優勢頻率，並對其作振源分析，得出開停機初始時刻因水流不穩均出現強烈的振動現象，且低頻段信號能量最大，開停機過程水流脈動壓力和尾水渦帶擺動是引起定子基礎振動的主要原因。This dissertation presents how to use the ultrasonic motor as an actuator to suppress the flutter of a two - dimensional airfoil section with a control surface. the ultrasonic motor, which features simple structure, high torque at low speed, small size, low weight and no electromagnetic contamination, is a promising actuator for the flutter suppression of small aircraft
超聲電機以其結構簡單緊湊、轉矩/質量比大、低速大扭矩、直接驅動，動態響應快、斷電自鎖和不產生磁場且不受外界磁場干擾等優點，有望成為一種非常有前途的作動器，用於小型飛機的機翼顫振主動抑制。Environmental testing - part 2 : tests - tests z afc : combined cold vibration sinuso ? dal tests for both heat - dissipating and non - heat - dissipating specimens
環境試驗.第2部分:試驗.試驗z afc :熱消散和非熱消散試樣的低溫振動From this paper ' s study, it had been identified that the pushover analysis method was reliable in scope below : ( a ) low - middle rise, regular, the first model deformable structures, ( b ) short - period structures, ( c ) middle - rise non - symmetric frame structures, ( d ) middle - rise vertical - irregular frame structures, ( e ) middle - rise base - isolated structures, etc. it had also been identified that the time history analysis method could be replaced by the pushover analysis method when the pushover analysis method was reliable
通過本文的研究，證明了pushover法在如下結構中的應用具有足夠的準確性：中低層、規則、以第一振型為主要變形特徵的結構，短周期結構，多層不對稱框架結構，多層豎向不規則框架結構，多層基礎隔震結構。同時證明了在pushover法的適用范圍內，可以應用簡單的pushover法代替復雜的非線性動力時程分析法對結構進行抗震性能評估。The way to eliminate chaos phenomenon through adjusting system parameters is indicated. the nonlinear dynamic behavior of journal bearing - rotor system in large parameter space is studied in numerical integral method and floquet theory and the first and second bifurcation behavior of nonlinear rotor system are discussed ; the concept is advanced that realizing the controllable nonlinear stiffness with sfd with the soft - nonlinear of sma in the super - elasticity state to make the vibration amplitude of system always be in the small solution state to reduce the vibration amplitude of rotor system
運用數值積分方法結合floquet理論對滑動軸承-轉子系統的大參數范圍非線性動力學特性進行了全面的研究，詳細地討論了系統的一次和二次分岔行為； 5 ）提出了用形狀記憶合金在超彈性狀態下的軟非線性，結合擠壓油膜阻尼器實現系統剛性的非線性可控，降低系統在非定常狀態下的最大振幅的構想。We apply fuzzy control theory to active control over engine body vibration, design fuzzy control system which combines intelligent control with feedback control. this control strategy mends the flaw of complexity, nonlinear and uncertainty when we use traditional control method. by measuring rotate speed and vibration speed of i. c
在主動控制的基礎上，採用了模糊控制的演算法，設計了內燃機整機振動模糊控制器，改進了傳統控制方法在處理振動復雜性、非線性和不確定性等方面的缺陷，通過測量內燃機轉速和內燃機整機振動速度信號，動態地改變動力減振器的剛度，使減振器的固有頻率跟隨內燃機整機振動激勵頻率的變化，達到降低內燃機振動的目的。This paper is aimed to provide a computational method of sound radiation from the pressure and non - pressure hulls of submarines subjected to harmonious point forces. it is significant for reducing vibration and sound radiation of the submarine hull, guiding the optimization design of submarine and enhancing its battle ability
本文尋求潛艇耐壓和非耐壓船體結構受激振動輻射噪聲的計算方法，分析潛艇結構輻射噪聲的影響因素，對降低艇體振動和輻射的噪聲，以及潛艇結構進行隱身優化設計、提高其戰鬥力具有十分重要的理論指導意義。The threshold speed and the typical characteristics of the oil whip of the system are simulated under the nonlinear model of oil film force, and the state of motion and type of the bifurcation are analyzed by floquet multiplicators which is computed by the shooting method. secondly, the the nonlinear dynamical model of the low - pressure rotor - bearing system by column bearing with reduced dimensions is presented. the numerical results show the rule of the amplitude with the eccentricity of rotor, the length - to - diameter ratio, oil viscosity and the clearance - to - radius ratio of the bearing under the definite speed
其次，對降維后的低壓轉子?軸承系統的非線性動力學方程，計算了圓柱瓦軸承支撐的轉子系統的振動穩定性在固定轉速下隨偏心距、軸承長徑比、潤滑油動力粘度和軸承間隙比的變化規律，並分析了轉子前軸承軸頸的失穩轉速與轉子偏心距、軸承長徑比、潤滑油動力粘度和軸承間隙比之間的關系，同時利用floquet理論分析其運動狀態和分岔類型。A time - frequency analysis method is presented to solve paper machine press section bearing vibration signals of unstable and complication, applying wavelet function to the unstable signals for faulty bearing according to paper machine press section roll bearing characteristic, and process the vibration signals by means of decomposition and reconstruction, obtaining the vibration signals in different frequency bands, the statistic in frequency domain of relevant frequency bands is served as monitoring feature
摘要針對紙機壓榨部滾動軸承尺寸大響應弱、運轉速度低、低頻信號容易淹沒、調制源多、振動信號非平穩性等特點而導致常規的傅立葉分析診斷故障效果不佳的情況，提出了一種應用小波變換的時頻分析方法，對振動信號進行分解和重構處理，獲得了振動信號在不同的頻段的分量，提取相應特徵頻段重構分量的功率譜的頻域統計值作為特徵參數，從而實現對軸承故障診斷。At the same time, the dynamic response of structure under environmental excitation such as ground micro - earthquake, vehicle vibration and wind vibration, is usually disturbed with noise. thereby, the signal - to - noise ratio of data collected by sensors is rather low
同時，結構在環境激勵（如:地面微震、車輛振動或者風振等）作用下的響應信號由於受到噪聲干擾，儀器所能採集到的信號信噪比較低，而且是非平穩信號。These factors include the nonlinearity of suspension spring, the nonlinearity of damping force and the nonlinearity of driving force, etc, in which suspension spring and damping force are main factors that influence the distortion of ultra - low - frequency vibrator
影響振動臺臺面波形失真的因素有：乳膠管彈簧的非線性、阻尼力的非線性、驅動力的非線性等，其中，彈簧和阻尼力的非線性是影響振動臺超低頻失真度的主要因素。Based on the discussion of the nonlinearity of the vibrator, the mathematic model of ultra - low - frequency vibrator is established. then, on the basis of the ziegler - nichols pid controller, pid control parameters are modified according to the control requirements of object, and the computer simulation is done. finally, low - frequency feedback system is built up, which solves the problem of high distortion of the output of vibrator under ultra - low frequency
從分析標準振動臺在超低頻時的非線性因素入手，建立了超低頻標準振動臺的數學模型；然後在zieglernichols法設計pid的基礎上，根據控制對象的性能要求修正了pid參數，並作了模擬研究；最後設計出低頻反饋系統，解決了振動臺超低頻失真度較大的問題。Dynamical evolution of spatial bright solitions in cogarithmically nonlinear electric media under weak amplitude condition was studied
摘要研究了對數型非線性電介質中低振幅空間明孤子的動態演化特性。Regarding the suspension system as a substructure ( subsystem ) appended on the car body, and considering the vibration transfer effect of the suspension system for the displacement excitation induced by unevenness of road surface, an explicit formula about the quantitative relationship between the sound pressure of low frequency interior noise and some of the suspension characteristic parameters of a vehicle, i. e., the stiffness, the damping, the under suspension mass of suspension system, and the radial stiffness, the radial damping of tire, is deduced based on the dynamic substructure modification method for structure - acoustic coupling analysis of an automobile ' s passenger compartment
摘要基於車身乘坐室聲振耦合的動態子結構修改方法，將汽車懸架系統視為附加於車身上的子結構（子系統） ，並結合懸架系統對路面不平度位移激勵的振動傳遞效應，揭示出車內低頻噪聲的聲壓值與懸架系統剛度、阻尼、非懸掛質量以及輪胎徑向剛度、徑向阻尼間的直接定量關系。分享友人