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 Posted: Sun 1:10, 19 Dec 2010 Post subject: ed hardy clothing Spectral analysis of noise sourc |
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Spectral analysis of noise sources in the compressor of
Value of the frequencies were: 16.5Hz33Hz, 49.5ttz, 66 ... ... 181.5Hz, 198Hz, the frequency relationship is very clear. WP270 compressor speed 984r/rain, fundamental frequency is 16.5Hz. Because it is the same structure of the cylinder by the two installed on the same crankcase, the crankshaft 180 by the two differ. The composition of crank, the spindle rotation week, unbalanced inertia force and piston force have undergone two cycles of the cycle, the vibration of 33Hz component of this park is relatively large, other vibration components are produced by them and pulled down the compressor map l2 spectrum of students. To further confirm that the main amount of 16.5Hz, and we find down the compressor vibration spectrum,[link widoczny dla zalogowanych], as shown in Figure l2, 60.938ms vibration was prominent, you can determine the vibration of the compressor is 16. 5Hz played vibration Bf It can be obtained, the measures to solve the compressor vibration from two aspects: (1) inertial force balance, and weight should be San thistle to reduce inertial forces sealed the smallest imbalance to reduce vibration but 16.5Hz machine for the vertical structure, determine the secondary inertia force is not balanced, coupled with the piston force, causing the vibration of 33Hz I (2) strengthening the body rigid, for which we conducted on the unit chassis modal test. Mei unit chassis for welding end, the model drug was found that the main wicker 9 1992 8 fluid engineering platform. Mine Bureau Ventilator airflow stabilizer to improve the experimental one by Harbin Industry University Abstract Fengming 14 Fu l stabilizer in the gas flow guide vane setting Bureau of Mine Ventilator performance were j experimental studies, the results for improving the flow stability The design, to improve mine Bureau Ventilator feature provides stable conditions I j reference. Key words main fan base 璺 Seddon 'poured a rich flow stabilizer (also known as proud of the air separator) is an improved axial fan unstable conditions characteristic of the device. It is a circular object, installed in Phoenix in front of the shell rotor, concentric with the shell. When the fan flow is less than the design flow, from all points of a rotor at the top of return air, Wu Yun-channel stability of the forward air flow, and then come back to turn the main flow. Air stabilizers working principle and design method in [1] has been discussed before. Airflow stabilizer first proposed the former Soviet Union scholar Igor Ivanov, is now patented in many countries in the sub-projects have a wide range of applications, especially large changes in working conditions axial fan,[link widoczny dla zalogowanych], such as the fan in mine Fans of the most widely used. Practice shows that the airflow stabilizer in the larger context, the fan's performance improved significantly, it attracted world attention and research to continuously improve performance. Japanese researchers have proposed a new program, the stabilizer in the circular flow channel additional guide vanes, it was reported the good results. We have designed based on the theory of Ivanov Agency for Mine Ventilator airflow stabilizer, its performance is better, but the fan performance curve is still a concave area. In addition, the axial fan size is too large, making the whole fan of the size, weight increased. To further improve the fan performance,[link widoczny dla zalogowanych], see the program proposed by Japanese scholars, we conducted experiments to explore the possibility of improved air stabilizer. Experiment 2 Experimental device speed fan is a radial fan in mine-type axial flow fan. Air volume is 10500m / h, wind pressure 1.91kPa,[link widoczny dla zalogowanych], speed 2950r/rain, power 8kW. Transferred to the other ring is based on the amount of the design flow, 7 blades, top of the chord length 226mm, root chord length 150mm,[link widoczny dla zalogowanych], diameter 460mm, compared with 0.51 hub import and export hub to 0. Ming. The fans have been imported after the adjustable diffuser and diffuser, inlet guide device has 8 rotating blades, have children after the diffuser blades. Shell diameter of 464mm, the average top of the gap 2ram. Figure I shows the work in the experiment with a Sun flat. Comrade Zhao. The following rigid machine less than two channel. To this end, we have four in the channel within the welding ribs, well re-installation of the unit. Actual jump that vibration speed from the original 27mm / s down sub-7mm / s, the noise down thistle 81.5aa (A), more obvious effects. 6 Conclusion (1) spectral analysis technique is an important means of identifying the noise source can be widely used in general machinery products stand vibration and noise analysis, the sound source recognition accuracy. (2) the use of software and computer can be composed of a multi-purpose spectrum analysis system, economical and easy to carry, conducive to the promotion. (3) compressor for multi-source equipment, a compressor inlet and exhaust noise, body vibration of the compressor drive motor noise and radiated noise. Must be identified accurately and take appropriate noise reduction measures in order to achieve significant noise reduction.
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