Pressure fluctuations are one of the most important parameters in the design and operation of gas - solid circulating fluidized bed ( cfb ) , whose signals reflect lots of nonlinear hydrodynamics behaviors in the bed 压力波动是气固循环流化床设计和操作中的重要参数，其信号包含了大量床内非线性流体力学行为的信息。
The integrated electronics supply the standardized signal . gauges with liquid filling provide a practically vibration - free display if pressure surges or mechanical vibrations arise and have a particularly long service life 当有压力波动和机械振动的情况下，充液压力表能提供不受振动影响的显示，而且有很长的使用寿命。
Relief vent will discharge water when , during no - flow periods , ( 1 ) the first check valve is fouled or ( 2 ) the inlet pressure to the device drops sufficiently due to upstream pressure fluctuations 如果在无流动期间，安全阀排气口有水排出，则原因可能是， ( 1 )第一止回阀受到污染，或( 2 )由于上游压力波动造成装置的进口压力下降太大。
R / s models are established using the pressure fluctuation signals of gas - solid fluidized bed . analytic results show that the autoregressive orders of the pressure fluctuation signals are different in various flow regimes of gas - solid fluidized bed 利用压力波动信号建立了ar模型，对气固流化床的流型进行了分析研究，发现在不同流型下， ar模型阶数有明显不同。
Each parameter affecting to its natural frequency and vibration characteristic is analyzed ( such as the supporting stiffness coefficient , the supporting distance , the internal pressure and the velocity of fluid in the pipeline ) 分析了各参数(支承刚度系数、支承跨距、管内压力、管内流体速度)对振动特性的影响；对速度波动、压力波动对固有频率的影响作了探讨。
With pulsating pressures or mechanical vibrations , we use a glycerine filled version of the product and a specially developed throttle section with an effective damping system so that stability and display quality are considerably improved 在有压力波动和机械振动的应用场合，我们通过填充甘油和采用带有高效阻尼系统的节流部件，以提高压力表的稳定性和读数准确度。
2 . building the nonlinear theory model and experimental identing model of the electro - hydraulic servo control system , and analyzing the pressure rippling of the cylinder ’ s two chambers and the forward and reverse output characteristic of the valve controlled asymmetric cylinder 2 .对模拟平台电液伺服控制系统建立了非线性理论模型和实验辨识模型,并对液压缸两腔压力波动、阀控非对称缸正反向输出特性等进行了分析。
The system has others virtues , such as wide fuel adaptability , little fluctuation of pressure , good seal performance , etc . the injector of direct injection is assembled from electronic controlled valve and diesel injector , and it is used in the experiment 研究了多种燃料供应方式下的燃料供应系统，其中缸内喷射系统创造性地采用液压增压方式，其具备燃料适应性广、喷射压力可调( 2 12mpa ) 、压力波动小、密封性好等优点。
The measurement was made on a gas - solid fluidized bed in our laboratory . the pressure fluctuation signals were obtained and analyzed through power spectrum density . the relation of the particle size to pressure fluctuation and other parameters was studied by using fuzzy set theory 在实验室条件下对气-固流化床的颗粒进行了测量，通过功率谱密度对所获得的压力波动进行了分析，并应用模糊集理论对颗粒尺寸与压力波动及其它影响参数的关系进行了研究。
On the rotor blade pressure surface , the dominant frequencies of unsteady surface pressure are the up - stream blade wake passing frequency and its harmonics , and the amplitudes of pressure fluctuations decrease from leading edge to trailing edge 转子叶片吸力面非定常压力受叶片附面层和上游叶片尾迹共同影响，其主导频率为上游叶片尾迹频率及其倍频，但是在吸力面前部气流加速区压力波动幅度沿流向增大，而在吸力面后部气流减速区压力波动幅度沿流向减小。
