As interest in the quality of life has recently increased, there is a growing interest and demand for exercise equipment, such as indoor treadmills or cycles, which can be used at home. However, the use of such indoor exercise equipment has caused social problems by generating noise between floors and causing inconvenience to neighbors. In particular, treadmills that generate a lot of vibration during use cause more social problems in an assembly building, such as an apartment. The purpose of this study is to design dampers of various shapes and to develop dampers with high vibration damping effects through vibration analysis. The damper was installed at the lower end of the treadmill to reduce vibration from the product. Three types of dampers were designed by referring to the damper shape of the existing treadmill, and the vibration reduction effect of each damper shape was verified through structural analysis of the magnitude of vibration generated from the bottom surface of each damper.
The aim of the study is to create a method for selecting an asynchronous traction electric drive for an electric vehicle that enable the assessment of necessary technical, environmental and operational qualities. When choosing an electric motor for a traction electric drive, the methods for calculating electric machines, reducing the vibrations and electric drive theory were used. The economic and environmental characteristics of the car was analyzed and the use of a traction drive was deemed an effective solution to this problem. The analysis of advantages and disadvantages in traction electric drive were assessed and it was proved that an asynchronous frequency-controlled electric motor is well suited for a traction electric drive. This facilitates the minimization of the size and weight of the entire vehicle. To improve the reliability and service life of electric motors operating in automobiles with high rotational frequencies, a proposal to evaluate the quality of traction electric motors by the level of vibration in the frequency range of 5-10,000 Hz was made. For this study, three classes of vibration norms are offered and the means to achieve them are examined and the recommendations not to exceed them in electric and hybrid vehicles were determined.
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Requirements for vibroacoustic methods of the quality assessment of vehicles traction electric motors Vasiliy Migal, Shchasiana Arhun, Andrii Hnatov, Olha Ulianets, Igor Shevchenko Noise & Vibration Worldwide.2024; 55(4-5): 210. CrossRef
Analysis of the preferential effects of the use of asynchronous electric motors in the industrial sector G. S. Armashova-Telnik, T. A. Bobovich Proceedings of the Voronezh State University of Engineering Technologies.2022; 84(2): 329. CrossRef
Estimation of Excitation Current of a Synchronous Machine Using Machine Learning Methods Matko Glučina, Nikola Anđelić, Ivan Lorencin, Zlatan Car Computers.2022; 12(1): 1. CrossRef
Design optimization of vehicle asynchronous motors based on fractional harmonic response analysis Ao Lei, Chuan-Xue Song, Yu-Long Lei, Yao Fu Mechanical Sciences.2021; 12(1): 689. CrossRef
Reducing the vibration of bearing units of electric vehicle asynchronous traction motors Vasiliy Migal, Anatoliy Lebedev, Mykhailo Shuliak, Evgeniy Kalinin, Shchasiana Arhun, Vladimir Korohodskyi Journal of Vibration and Control.2021; 27(9-10): 1123. CrossRef
Choice of Parameters for the Electrodrive Diagnostic System of Hybrid Vehicle Traction S. Arhun, Yu. Borodenko, A. Hnatov, A. Popova, H. Hnatova, N. Kunicina, A. Ziravecka, A. Zabasta, L. Ribickis Latvian Journal of Physics and Technical Sciences.2020; 57(4): 3. CrossRef
Steam turbines of thermal power plants are installed in such a way that packing ring surrounds the entire turbine rotors in order to reduce the amount lost due to a leak of steam and to improve performance. However, the conventional packing ring cannot affect positively fluid velocity of the direction of steam, so it does not have the power to reduce vibration of the rotor. In this research, a study was conducted to reduce it by lowering the rotational speed of steam in the rotor. Anti-swirl teeth which changes rotational speed of steam into axial speed of it, designed in front of the conventional packing rings, and their numbers, twist angles. The characteristics of the rotor and the anti-swirl teeth were chosen as design factors to reduce vibration of the rotor. Through the finite element, the improved packing ring designed with the optimal anti-swirl teeth was developed.
Recently, Laser Direct Imaging (LDI) has been used to replace lithography in Flexible Printed Circuit Board (FPCB) manufacturing. However, repeated motion of a linear motor caused residual vibration in the granite on which the workpiece was placed when the motor either accelerated or decelerated. Because the residual vibration made positioning less accurate, there were more defective products and worse productivity. This paper proposes a way to reduce vibration in the granite during the precision stage. First, the frequency domain of the vibrations of a pneumatic vibration isolator is identified. Second, we present the design of the mechanism using a voice coil actuator and a capacitive displacement sensor. Third, we apply a feedback control algorithm based on PID to cancel displacement. Consequently, we are able to propose an optimal way to reduce vibration for the laser direct imaging equipment. The amount of vibration reduction is evaluated in terms of amplitude and settling time.
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Reaction Force Compensator for High‐Speed Precision Stage of Laser Direct Imaging Process Chang-hoon Seo, Yong ho Jeon, Hyung-ku Lee, Hyo-young Kim, Moon G. Lee, Francesco Franco Shock and Vibration.2018;[Epub] CrossRef
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