ugg Boots Billig Single straight tube Coriolis mas

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Single straight tube Coriolis mass flowmeter: shell vibration damping power compensation

Measuring tube and only consider the first order compensation for vibration control, the system has three generalized degrees of freedom, so the system has three characteristic features of the frequency and the corresponding vibration modes: modes 1, measurement and compensation control tube reverse vibration; vibration mode 2, the measurement tube and shell shapes with the vibration} 3, the compensation tube and the shell with the vibration. Meet the conditions of dynamic phase compensation can ensure the system works in modes 1, in order to ensure minimal vibration case, adjust the amplitude compensation management to meet the conditions for dynamic compensation of the amplitude of the vibration mode will produce 2 or 3 modes to compensate for housing vibration. The following analysis of the required control energy. Vibration excitation beam power P_) d (2 Cool

uniform straight beam under concentrated load at the midpoint of the excitation power required P-518.6EI (wt a ~) cos (29) in which active P-259. 3 Kwu El (1 + cos2o.tt) (3o) reactive power P from a 259.3 (1 a) (EI / L.) Ji sin2tot (31) Since the system work in the measuring tube on the characteristic frequency of the first order, Therefore, the excitation of the measuring tube is only active power, reactive power not blind, when the measuring tube of the quality factor is high,[link widoczny dla zalogowanych], the required excitation power is very small start-up speed if less demanding, then the shock of the measuring tube oscillations do not give much thought to the main pipe should be considered compensation for the required control energy, if the compensation tube of the first order deviation from the characteristic frequency of the measuring tube of the first order characteristic frequency, the vibration compensation control the reactive power required will increase significantly . 6 examples of our prototype design parameters for measuring the tube length L-400mm, diameter D - 8mm. Diameter of a 6mYll, elastic modulus E - 290GPa,[link widoczny dla zalogowanych], density, quality factor Q of a 7.8kg/emt a 1O0. Experiment, the fluid is water, the exciting force to calculate the rate of F-05N EI one 27.48N ・ m. m1 an O. 1998kg / m, ∞ Il】 a 1639.9rad/stA a 363.0p-m measuring tube in the shell on the role of dynamic load for the F. 】 A 65.98sin (wt +014.) N shows the dynamic load is quite large, and it is close to the displacement of the measuring tube with the same phase of the excitation power of the measuring tube P. I a 9.2406 (1 + cos2o ~ t) WP women. Set a compensation tube 1-0 O81m, other parameters and measuring tube are the same, there are ∞ ¨ / 2 a O. 9 in accordance with the terms of compensation the amplitude A can be obtained for a desired excitation power 1.1682A P. z-O. 2955 (1 + eos2ae) WP from. 2-6.238sin2 ~ tW tube when a 1.21m compensation when there are ∞ /. 2-1.1 amplitude compensation in accordance with the conditions required to obtain Az a 0.8627A excitation power P ,[link widoczny dla zalogowanych],2-0 .19697 (1 + cos2wt) WPz eleven 3.760sin2aeW see if compensation management and measurement tube characteristic frequency deviation of the first order 1o% in the soil to the. The required excitation power can be achieved, but the actual compensation tube and the measuring tube in the first order characteristic frequency deviation is small. Experiments show that the first order if the excitation frequency deviation from the characteristic frequency of no more than earth 1o%. Prototype excitation system can make appropriate, to achieve the required amplitude of the vibrating tube, so even if the compensation tube and the parameters of the measuring tube there is a deviation,[link widoczny dla zalogowanych], you can compensate by adjusting the conditions of excitation control for power management compensation to relax the parameters of tolerance compensation can effectively reduce the amount of total manufacturing costs glistening. 199906-16 Received PhD supervisor Professor Chen Ming Joint Subscription ◆ 3500 journals website notices and International Internet magazine have joined the \please press linked to the national set of non-Mailroom Write now United Services set Services for free on the Internet site is now online (website: [link widoczny dla zalogowanych]),[link widoczny dla zalogowanych], \Internet access to journals, download the \. The Department's address and bank account are as follows: Account Name: United Subscription Service Account :6005248 -1046196 Bank: ICBC branch in Tianjin Eagle's Nest Postcode: 300220 Tel: (022) 23973378,23962479} Fax: 23973378 Address : Chen Tang Zhuang Yanfeng Road, Tianjin, No. 5 United Subscription Service Website: [link widoczny dla zalogowanych] @ punictpttj.cn Editorial Staff

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