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jump phenomena
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  跳跃现象
     An experimental and theoretical investigation on the transient response of a flexible rotor-SFDB(squeeze film damper bearing)system during passage through resonance is developed. It is found that the influence of the magnitude of rotational acceleration on the jump phenomena of this nonlinear rotor during passage through resonance is not obvious.
     本文经对一个柔性转子-SFDB(squccze film damper bearing,挤压油膜阻尼器轴承)系统通过共振时的瞬态响应进行试验研究和理论分析,认为:旋转角加速度的大小对此非线性转子通过共振时的跳跃现象的性质不产生明显影响,这说明,在实际的加速条件下,这一类转子系统通过共振时的跳跃现象是不能完全避免的.
短句来源
     The criterion of the jump phenomena and some results different from the articles [1], [4] are obtained.
     得出与文献[1,4]的不同附加转动惯量表达式,并获得出现跳跃现象的一些判据。
短句来源
     The curves of its amplitude frequency response have some nonlinear features, such as inclination and jump phenomena of the curves , which coincide with the theoretic analysis.
     参激横摇幅频响应曲线具有某些非线性特征 ,如曲线的倾斜和跳跃现象 ,这与理论分析是一致的 .
短句来源
     Investigation presented in this paper shows that the unstability could be suppressed by adding cubic nonlinear elasticity. However, jump phenomena would occur when the exciting frequency falls into certain domain. It is also shown that the conditions of appearing of 1/2-order subharmonic resonance are the same for these two systems in the sense of the first-order approximation.
     研究表明,加入三次非线性弹性可以抑制不稳定性,而在一定频率范围出现跳跃现象,且两种系统发生1/2阶亚谐共振的条件在一阶近似下相同.
短句来源
     On the response curves of primary parametric resonance and fundamental resonance of the system exsit jump phenomena.
     系统主参数共振-主共振曲线均具有跳跃现象
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  “jump phenomena”译为未确定词的双语例句
     The Influence of Exacted Force Nonlinearity about the Jump Phenomena in Moving-coil Loudspeakers
     强迫力非线性对动圈扬声器跳变现象的影响
短句来源
     Jump Phenomena in the 500 hPa Signal Field and the Occurrence of China's Heavy Rainfalls
     500hPa高度场的信号场突变与我国暴雨的发生规律性研究
短句来源
     The influence of magnetic field nonlinearity about the jump phenomena in moving-coil loudspeakers are set forth through experimental study and theoretical calculation, Several methods for rejecting jumps are given.
     通过实验研究和理论计算,阐述了磁场非线性对扬声器跳变现象的影响,并提出了抑制跳变的途径
短句来源
     Prevention and Cause of Vehicle Jump Phenomena at Bridge Head of Highway
     高等级公路桥头跳车病害的成因及预防
短句来源
     The results show: there are the quasi-periodic features and unsuccessive jump phenomena in the interannual variation processes of Northern Hemisphere monthly mean general circulation anomalies.
     结果表明:北半球月平均环流异常年际演变的过程具有准周期特征及不连续的跃变现象。
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  相似匹配句对
     THE FORCED ROLLING OF SHIP MODEL AND ITS JUMP PHENOMENA
     船模强迫横摇及其跳跃现象
短句来源
     Discussion on π Jump at Boundary in Diffraction Phenomena
     关于衍射现象中边界π跃变的讨论
短句来源
     JUMP SHOT
     跳投
短句来源
     interpretations of phenomena;
     对现象的解释;
     Bungee Jump
     蹦极
短句来源
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  jump phenomena
Under harmonic forcing, a bifuraction of a stable branch of forced travelling waves from a branch of forced normal mode motions is detected, and "jump" phenomena between branches of periodic solutions are observed.
      
The observed behavior is that of a softening Duffing-oscillator, including jump phenomena and multiple stable amplitude responses at the same excitation frequency and voltage.
      
In addition to knownbehaviors, a rich class of solutions and bifurcations, mostly unexpectedfor hysteretic oscillators - including jump phenomena,symmetry-breaking, complete period-doubling cascades, fold, andsecondary Hopf - is found.
      
Under some conditions, co-existence of two kinds of stable steady-state solutions, saturation and jump phenomena may occur.
      
The dependence of the response amplitude on the excitation level reveals three distinct regions: nearly linear behavior, jump phenomena, and energy transfer.
      
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In this paper, an experimental study of high-order stimulated Ra-man scattering (SRS) in benzene is described. A ruby laser with asaturable absorber has been used as an exicting source. The spe-ctrum of SRS is recorded spectrographically. Stokes lines from 1st to5th order and anti-Stokes lines from 1st to 4th order of the C-Cbond A_? symmetric vibration of benzene have been recorded. It isfound that an "order-jump" phenomenon on Stokes intensities mayoccur in C_6H_6.

本文报导了苯的高级受激喇曼实验;分别用调Q及锁模红宝石激光激发苯液体,用摄谱仪拍摄受激喇曼谱线,观察到苯的最强喇曼线Δν=992cm~(-1)的五级斯托克斯线,并观察到四级反斯托克斯线。测量了喇曼线的能量转换效率,观察了光束花样。发现在苯的多级斯托克斯线的强度分布上存在着“级跳”现象。

This paper has discovered that arc appearances in that pulse MIG welding process are controllable.The technological characteristics of fhe pulse arc can be regulated to some extent by controlling the arc appearance.The different visiblearc appearances are dependent on the changing process of the instantaneous arc appe-arances.This paper has examined fhe effect of pulse currnt waveform,pulse currentamplitude,shielded gas and other factors to this changing process,and offer thepossible ways for controlling the...

This paper has discovered that arc appearances in that pulse MIG welding process are controllable.The technological characteristics of fhe pulse arc can be regulated to some extent by controlling the arc appearance.The different visiblearc appearances are dependent on the changing process of the instantaneous arc appe-arances.This paper has examined fhe effect of pulse currnt waveform,pulse currentamplitude,shielded gas and other factors to this changing process,and offer thepossible ways for controlling the arc appearance.Different arc appearancedetermines the different metal transfer mode.Through the comparative studyof metal transfer modes in both,flat and overhead welding positions by high-speedphotography authors of this paper suggests that both single-droplet and multidroplettransfers per pulse are axial and powerful in flat and overhead welding,but themultidroplet transfer mode per pulse can have broader region of welding condit-ions than singledroplet mode.Arc jumping phenomenon is a common physical essence of the strearming transfer mode.The essential chang of the liquid wire tip and the appearing of the streaming transfer feature take place only after the arc jumping phenomenon.In process of streaming transfer of continuous current arc jumping phenomenonappears only once at start stage of arc,while in process of pulse streaming tra-nsfer arc jumping phenomenon repeats in every pulse current period.In both single-droplet and multidroplet transfers per pulse droplet can deta-ch and transfer after the end of pulse current period (i.e.during base currentperiod).This may attribute to inertia action of transfer mass and to instabilityof liquid metal column on the wire tip,which separates into several pieces andthen form small droplets transfering to weld pool.

本文通过试验发现熔化极脉冲焊具有电弧形态可控的特点,通过两种典型目视电弧形态的控制可以在一定程度上控制脉冲电弧的工艺特性。不同的目视电弧形态是不同的瞬时电弧形态的变化过程决定的,本文研究了脉冲电流波形、脉冲电流值和保护气氛等因素对瞬时电弧形态变化过程的影响,为控制电弧形态提供了可能的途径。熔滴过渡与电弧形态有密切的关系。不同的电弧形态决定了不同的熔滴过渡形式(?)本文用高速摄影技术通过平焊和仰焊试验对不同熔滴过渡形式进行了比较,认为一脉冲一滴(脉冲喷滴过渡)和一脉冲多滴(脉冲射流过渡)在平焊和仰焊位置都能实现有力的轴向过渡,但一脉冲多滴的过渡形式可以有更宽的规范区间。跳弧现象是射流过渡的共同物理本质,只有在出现跳弧现象之后,焊丝端头的液体金属才能产生本质的变化,并出现射流过渡的特点。连续电流射流过渡时,跳弧现象只在引弧初期出现一次,而脉冲电流的脉冲射流过渡时,跳弧现象在每次脉冲电流期间都重复出现。脉冲喷滴过渡和脉冲射流过渡时皆有熔滴在脉冲电流停止后过渡的现象。这种在脉冲电流停止后仍能实现熔滴有力过渡的原因是由于惯性作用和细长金属液柱失稳而自动截成数段,形成分离的小熔滴而实现过渡的。

In this paper various metal transfer modes in the pulse MIG welding with steel electrode are studied by means of high speed cine camera and oscillograph. Experiments have been made in the downhand and the overhead welding positions. The authors suggested that, though both the monodroplet per pulse and the multidroplet per pulse transfer modes can provide a smooth and strong axial metal transfer, the former exists only in a narrow welding condition region while the latter in a wider region. So the multidroplet...

In this paper various metal transfer modes in the pulse MIG welding with steel electrode are studied by means of high speed cine camera and oscillograph. Experiments have been made in the downhand and the overhead welding positions. The authors suggested that, though both the monodroplet per pulse and the multidroplet per pulse transfer modes can provide a smooth and strong axial metal transfer, the former exists only in a narrow welding condition region while the latter in a wider region. So the multidroplet per pulse transfer mode is more favourable. There are two critical current levels demarcating the distinctively different metaltransfer mode regions in pulse MIG welding. The first is called the critical pulse transfer current, being the lower threshold current of the monodroplet per pullse transfer; and the second is called the critical arc jumping current, being the lower threshold current of the multidroplet per pulse transfer. The relation between the arc luminous core shapes and the metal transfer modes of the pulse MIG welding are also studied and discussed. The authors have found that the starting of the multidroplet per pulse transfer is always accompanied with an "arc jumping", i. e. the luminous arc root attached to the front surface of the droplet jumps instantly up to the bottom of the constricted neck. This arc jumping phenomenon takes place at a certain amplitude of pulse current with a certain correlated pulse current time. In the conventional MIG welding process this arc jumping phenomenon appears also at the time a globular transfer is converted into a streaming transfer. In essnce the critical current of the conventional MIG welding process is just the critical arc lumping current in a continuous current condition. This is supported by the evidence that by extending the pulse current time the critical arc jumping current in the pulse MIG process will gradually approach to the critical current of streaming transfer in the conventional MIG process. During the process of both monodroplet and multidroplet per pulse transfer the droplet detachment can take place even after the cutoff of the pulse current. This may be attributed to the inertial force of the molten metal in motion and to the instabiility of the thin liquid metal column on the electrode tip.

本文利用高速摄影机和示波器研究了钢焊丝熔化极脉冲焊的各种熔滴过渡形式,试验是在平焊和仰焊位置进行的。作者指出虽然一脉冲一滴和一脉冲多滴的过渡形式在平焊和仰焊位置都能提供稳定而有力的轴向熔滴过渡,但前者只能在很窄的焊接规范区存在,而后者有较宽的焊接规范区间。因此一脉冲多滴的过渡形式是更合理的。熔化极脉冲焊存在两个区分不同熔滴过渡区的临界电流。第一个称为“临界脉冲过渡电流”它是一脉冲过渡一滴的下限电流。第二个称为“临界跳弧电流”,它是一脉冲过渡多滴的下限电流。文中还对熔化极脉冲焊的电弧形态与熔滴过渡形式的关系进行了研究和讨论。发现一脉冲多滴过渡的产生过程总是伴随着“跳弧”现象,亦即附着在熔滴端面上的烁亮弧根突然上跳到缩颈的根部。这种跳弧现象在一定的脉冲电流幅值和相应的脉冲电流时间产生。在通常的熔化极气电焊中,当由颗粒过渡转变到射流过渡时也出现这种跳弧现象。实质上,常规的熔化极气电焊过程的临界电流就是连续电流下的临界跳弧电流。下面的现象可说明这一点,在熔化极脉冲焊过程中,当延长脉冲电流时间时,临界跳弧电流将逐渐接近常规熔化极气电焊的射流过渡临界电流。在一脉冲一滴和一脉冲多滴的过渡过程,在脉冲电流停止后还能出现熔滴脱...

本文利用高速摄影机和示波器研究了钢焊丝熔化极脉冲焊的各种熔滴过渡形式,试验是在平焊和仰焊位置进行的。作者指出虽然一脉冲一滴和一脉冲多滴的过渡形式在平焊和仰焊位置都能提供稳定而有力的轴向熔滴过渡,但前者只能在很窄的焊接规范区存在,而后者有较宽的焊接规范区间。因此一脉冲多滴的过渡形式是更合理的。熔化极脉冲焊存在两个区分不同熔滴过渡区的临界电流。第一个称为“临界脉冲过渡电流”它是一脉冲过渡一滴的下限电流。第二个称为“临界跳弧电流”,它是一脉冲过渡多滴的下限电流。文中还对熔化极脉冲焊的电弧形态与熔滴过渡形式的关系进行了研究和讨论。发现一脉冲多滴过渡的产生过程总是伴随着“跳弧”现象,亦即附着在熔滴端面上的烁亮弧根突然上跳到缩颈的根部。这种跳弧现象在一定的脉冲电流幅值和相应的脉冲电流时间产生。在通常的熔化极气电焊中,当由颗粒过渡转变到射流过渡时也出现这种跳弧现象。实质上,常规的熔化极气电焊过程的临界电流就是连续电流下的临界跳弧电流。下面的现象可说明这一点,在熔化极脉冲焊过程中,当延长脉冲电流时间时,临界跳弧电流将逐渐接近常规熔化极气电焊的射流过渡临界电流。在一脉冲一滴和一脉冲多滴的过渡过程,在脉冲电流停止后还能出现熔滴脱离的现象,这可能是由于焊条熔化金属运动的惯性和焊条端头上金属细液柱的失稳现象所引起的。

 
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