負脈動 的英文怎麼說
中文拼音 [fùmàidòng]
負脈動
英文
negative ripple-
Because pressing of arteries and veins increased the impact to blood - vessel greatly, this is, make easy exhaustion mixes the stretch ingredient of tube wall rupture, easy development is aneurism and possible burst, at the same time of hemal wall inside film is injured easily and bring about sclerosis of arterial congee appearance and thrombosis, the hemal sclerosis that and be pressed with wide arteries and veins coexists and diastolic pressure are too low return burden of can aggravating heart and blood of influence coronal arteries and veins to offer
這是因為脈壓大就增加了對血管的沖擊，使管壁的彈性成分輕易疲憊和斷裂，易發展為動脈瘤並有可能破裂，同時血管壁的內膜輕易損傷而導致動脈粥樣硬化及血栓形成，並且與寬脈壓並存的血管硬化及舒張壓過低還會加重心臟負擔和影響冠脈血供。The substantial alteration by 160 % in the range of the blood flow pulsation can negatively affect the function and plasticity of the blood circulatory system and may potentially lead to the development of hypertonic or hypotonic symptoms in the human body
在血流脈動范圍內，透過160 %相當可觀的變化，可能對血循環系統的功能及塑性具負作用影響，並且可能潛藏在人類身體導致張力亢進或低壓癥狀的發展。In the positioning servo - system, which generally is configured by the d. c. pulse width modulator ( pwm ) velocity governing system and position servo - loop, the parameter perturbance of pwm velocity loop really exist by reason of such as the load behavior ; power voltage supply ; operating setting value, etc. 1, 2 ， and it cannot be ignored. by using the identification technique to form the mathematical model of the system, authors have confirmed the facts. therefore, to design the discrete sliding mode controller ( dsmc ) of the positioning servo - system, the perturbed parameters value bounds of the pwm velocity loop, which is as the controlled plant of position servo - loop, should be accounted. consequently, the design principle of dsmc for accounting system with parameter perturbance is proposed by the authors. the proposed method can ensure the stability of system with parameter perturbance and the behavior of non - overshoot, fast precise positioning. in order to reveal the effects of the design method, the comparative research work is done by the authors. also, it has been tested in an industrial experiment, the results proved it is satisfactory
由直流脈寬調速系統（ pwm ）和位置環構成的定位系統中，速度環的參數隨負載特性；電網電壓；給定工況而攝動是不容忽視的.作者通過系統辨識建模也證實了這一事實1 ， 2 .因此在設計位置環的離散滑模控制時，必須針對速度環（即位置環的控制對象）的參數攝動范圍採用「對象參數攝動離散滑模控制器的設計方法」 ，以確保系統在參數攝動時的穩定性和快速、無超調、準確定位的優良動態品質.為剖析該設計方法的控制效果，本文作了對比性研究，並將該設計方法用於工業試驗中，取得了滿意的結果The characteristics of high pressure gyratory sprayed pumping discusses is presented, which is applicable in wide range of scope and ground layers, convenient for construction, long durability, wide source of materials. mechanism for subgrade strengthening : complex foundation of cement solid and earth between piles was formed by pulsant load of flowing pressure and spraying flow, water wallop, cavitation phenomenon, water wedge effect, extrusion force and air flow agitation etc so as to enhance foundation bearing force and reduce settlement and deformation
高壓旋噴注漿技術具有適用范圍、適用地層較廣，施工方便，耐久性好，材料廣闊等特點；其加固地基機理主要是通過流動壓、噴射流的脈動負荷、水塊的沖擊力、空穴現象、水楔效應、擠壓力、氣流攪動等效應形成水泥固結體與樁間土的復合地基，從而提高地基承載力，減少沉降變形。Its products comprise various types of electrostatic precipitator 、 long bag low pressure pulse 、 positive ( negative ) pressure reverse flow 、 rhombus bag filter ( explosion proofing and ordinary type ) 、 pulsant rotary reverse flow flat bag filter 、 gas - box pulse bag filter ; flue gas desulfurization 、 waste water treatment facility and different nonstandard equipment
主要產品有各種型號的靜電除塵器（管極式及極板式） 、長袋低壓脈沖袋式除塵器、正（負）壓反吹大布袋除塵器、菱形袋式除塵器（防爆型及普通型） 、脈動反吹扁袋回轉式除塵器、氣箱脈沖除塵器等收塵設備；煙氣脫硫設備、水處理設備及各種規格的非標設備。3. passive and active time - domain demodulation schemes were demonstrated based on a fiber bragg grating used as a tunable filter controlled by a piezoelectric stack, which was driven by an electrical sine wave signal. the measured strain applied on the sensor axially could be judged by observing the interval of the output between notches within a driving period in time - domain
利用匹配濾波技術，分別採用無源和有源方式，藉助受pzt驅動的解調光柵，將待測應變信息變為時序負脈沖間隔的變化，利用常規的示波器觀測同一掃描周期中兩負脈沖在時域中間隔的變化來確定待測應變的變化。Electricity metering - tariff and load control - particular requirements for electronic ripple control receivers
電氣測量.資費和負載控制.電子脈動控制接受裝置的特殊要求In chapter 3, the subgrid eddy - viscosity model for large eddy simulation is applied to calculate the three dimensions unsteady periodic turbulent flow in yantan francis turbine. the pulsating characteristics of some main physical parameters in flow field are found. the calculated axial water thrust of hydraulic turbine agrees with the model - test value
第三章採用大渦模擬亞格子渦粘模型，對巖灘混流式水輪機的流場進行三維非定常湍流分析，得到了流場中各物理量的脈動特性，計算出ms的軸向水推力與模型試驗值大小相當；同時論證了對于下機架承重的混流式水輪發電機組可採用其推力軸承負荷作為水電站廠房振動的最大垂直激振荷載。Development of the digital dc - speed controller of the pulse load
脈動型負載的數字式直流調速器Numerical results indicate that the sheath expands faster than dust - free sheathes. it is also shown that, for small dust particles, the motion of dust particles is very remarkable and the charging effect can be negligible, and for large dust particles, the charging effect of dust particles becomes more evident while they are almost kept stationary during the whole negative potential pulse
計算結果表明：塵埃等離子體鞘層要比無塵埃粒子的等離子體鞘層擴展地快；對于小顆粒的塵埃粒子，塵埃粒子的運動十分明顯，而塵埃粒子的充電效應幾乎可以忽略；對于大顆粒的塵埃粒子，充電效應將變得十分明顯，而塵埃粒子在整個負脈沖階段，幾乎保持不變。Abstract : enhancing function of pulsating draught for sintering process is studied with simulative burden in the laboratory. the experiment results indicate that sintering velocity is the fastest along with appropriate pulse draught frequency when negative pressure is lower
文摘:採用模擬原料，在試驗室內的脈動燒結裝置上，進行脈動氣流燒結試驗，探討了脈動氣流的頻率變化和抽風負壓等因素對燒結過程的強化作用In order to avoid the current ripple and the high switch frequency of fixed - band hysteresis current controllers, two hysteresis controllers of change hystersis - band are proposed. one is the sinusoidal - band hysteresis current controller, the other is the adaptive hysteresis current controller based on fuzzy theory
由於常規的滯環電流控制器不能有效地防止負載電流脈動，並且存在著容易導致逆變器的開關器件的開關頻率過高的問題，論文提出了兩種變環寬滯環電流控制器結構，其一是正弦環寬滯環電流控制器，其二是模糊變環寬滯環電流控制器。Presently most of the theoretical method to predict the propeller - induced hull pressure fluctuation is based on the calculation method in which the pressure is induced by pulsating source in infinite flow. the calculation method is adopted and the corresponded computer program is complied. the propeller - induced hull pressure fluctuation due to blade thickness, blade load, cavity thickness and the change of the cavity volume can be analyzed respectively in the computer program
目前，螺旋槳誘導的船體表面脈動壓力的理論預報方法，大多是以無限流場中點脈動源誘導的周圍流場的脈動壓力的計算方法為基礎的，本文採用該方法編制了計算程序，可以分別考慮槳葉厚度、槳葉負荷、槳葉上空泡厚度及其體積變化在船體表面指定位置上產生的脈動壓力。Unsteady separated flow, produced during the gate - opening period in the reverse radial gate tunnel of a high - lift shiplock, is characterized by negative pressure and high velocity as well as their intense fluctuations in space and time and could easily result in various harmful phenomena such as cavitation, gate vibration and sonic boom, which have been observed and confirmed by prototype and physical model tests
高水頭船閘輸水反弧閥門開啟過程中，后廊道內發生急變分離流，負壓、高速水流以及壓力與流速的劇烈時空脈動變化容易誘發空化空蝕、門振和聲震等有害現象已被原型觀測和物理模型試驗研究證實。8. a pulsating torque minimization approach based on disturbance observer is proposed. the new disturbance observer is designed to observe the unknown torque disturbance caused by the torque ripple, the varying of the motor parameters, the changing of load torque and the not ideal performance of the inverter
該系統將負載轉矩、轉矩紋波以及由電機參數的變化引起的轉矩干擾作為系統干擾，用干擾觀測器進行觀測，以此為基礎對轉矩脈動進行補償，實現對轉矩脈動的抑制。Abstract : wind tunnel experiments were carried out to investigate the influence of wind direction on the wind pressure of proximite buildings. mean and fluctuating pressure coefficients on a high building, at sixteen different wind incidences and with one and two interfering buildings, were measured in the tests. this paper presents the characteristics of wind pressure on the building, which varies with the incident wind angle and with the numbers of adjacent buildins. due to the variation of wind angle and the interference effects, the complex feature of pressure distributions can be found on the downstream building surfaces for building group arrangement at certain angle of wind attack. some area of the interfered building for such configuration, in comparison with one single building ' s, may undergo very strong positive or negative pressures
文摘:通過風洞實驗研究了風向對兩個和三個鄰近建築風壓分佈的影響特性.實驗結果給出了在不同風向角下，作用於受擾建築上的平均和脈動風壓系數.當受擾建築處于下游位置時，建築之間的干擾效應主要表現為遮擋影響，建築物上的總體風壓系數不是很大，但在建築物表面上有時會產生局部較大的負壓系數.另外，在某些風向角下由於受到上游分離氣流的影響，在下游建築的局部表面又會出現較大正壓.這些結果可供建築布置和結構設計時參考Besides, the properties of fibers carrying at different parts of the vascular prostheses differ greatly. it is predictable that the deterioration of prosthesis, under the physiological loads ( periodical pulse blood pressure etc. ), could happen firstly in the weaker zone in vivo. the deterioration shortens the life of vascular prosthesis
另外同一工序但處於人造血管不同部位的纖維的各項承載性能也存在較大差異，可以預測人造血管在體內承受反復脈動等生理負荷下，破損可能首先出現在相對薄弱的部位，縮短了人造血管的使用壽命。To put into operation a large amount of non - linear load, make in harmony wave of rural power grids serious becoming in pollution, pass to rural local electric wire netting main in harmony analysis of wave source, put forward in order to restrain from insert rural power grids in harmony wave source voltage total in harmony wave distortion rate and the containing rate change last device number pulsating for increase of goal, increase the pulse of the current change device and install light specified value electricity active wave filter mix with passive wave filter near the harmonics source to control the wave in harmony
摘要大量非線性負荷的投運，使農村電網的諧波污染日趨嚴重，通過對農村地方電網主要諧波源的分析，最終提出了以限制接入農村電網的諧波源的電壓總諧波畸變率和各次諧波電壓含有率為目標的增加換流裝置脈動數，以及在諧波源附近裝設小額定值的電力有源濾波器配以無源濾波器的混合型電力濾波方式，以進行諧波治理。9. a fuzzy reasoning controller is designed to improve the performance of the mentioned disturbance observer. as the motor speed and load torque varying, the parameter of the disturbance observer can be changed by the fuzzy controller based on experiences. the pulsating torque can be compensated more strictly in a extended range
9 、對基於干擾觀測器的轉矩脈動控制系統進行了改進，設計了一種模糊推理控制器，根據電機速度和負載轉矩的變化調整干擾觀測器的增益，保證了轉矩脈動控制系統的控制精度，並擴大了其運行范圍。The list betterments aimed at the properties of system : through the testing of dc voltage, pulse width and inverting voltage and frequency can be regulated online to fit for different steady load ; reducing speed ripples by compensating with nonzero voltage working proportional time ; adopting the technology of harmonics suppression. as a result, the high precision and wide speed control is realized and the step out is overcome
針對系統的性能指標，做了如下改進：對直流側電壓的檢測，在線調整逆變器導通脈寬、輸出電壓和頻率，可以適應不同大小的恆負載；並用非零電壓矢量作用時間進行補償的方法，減小電機的低速脈動；加入了諧波抑制技術等。分享友人