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Is there any friction in the gearing system of vertical axis wind turbine?

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Friction plays a significant role in the gearing system of vertical axis wind turbines. While wind energy abundance may not prioritize mechanical efficiency, reducing friction losses is crucial to minimize wear, cracking risks, and thermal stresses in the gearbox . Studies have shown that considering time-varying meshing friction and stiffness in the gear transmission system can lead to complex bifurcation and chaotic behaviors, emphasizing the impact of friction on system dynamics . Innovations in wind turbine design aim to reduce frictional and lifting forces to enhance efficiency, such as utilizing frictionless vertical axis-horizontal blade configurations . Additionally, vertical axis wind turbines incorporate frictional engagement between rotatable supporting means and main gear means for power generation at rated wind speeds .

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Patent Low friction vertical axis-horizontal blade wind turbine with high efficiency Biyikli Yrd Doc Dr Suleyman 29 Jun 2017	Not addressed in the paper.
Patent Vertical axis wind turbine Rajagopal Raghunathan Valagam 28 Jun 2013 2 Citations	Yes, there is friction in the gearing system of the vertical axis wind turbine, as described in the abstract where rotatable supporting means engage with the main gear means for power generation.
Open access•Journal Article•DOI Minimum friction losses in wind turbine gearboxes José I. Pedrero, Débora Martínez-López, José Calvo-Irisarri, Miguel Pleguezuelos, Miryam B. Sánchez, Alfredo Fernández-Sisón - Show less +5 more 15 Sep 2021-Forschung Im Ingenieurwesen-engineering Research 5 Citations	Yes, friction losses in wind turbine gearboxes are addressed in the paper to minimize wear and thermal stresses, crucial for optimal performance and longevity of the system.
Open access•Journal Article•DOI Nonlinear characteristics of a multi-degree-of-freedom wind turbine’s gear transmission system involving friction Xiaosun Wang 17 Jan 2022-Nonlinear Dynamics 3 Citations	Yes, the multi-degree-of-freedom wind turbine's gear transmission system involves time-varying meshing friction, which affects the system's nonlinear characteristics, including bifurcation and chaos behaviors.

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Related Questions

Does wind turbine can generate energy? research study?5 answersYes, wind turbines can generate energy by converting wind power into mechanical power, which is then transformed into electricity. Various research studies have been conducted to explore the efficiency and potential of wind turbines in generating power. For instance, studies have focused on optimizing wind turbine structures, utilizing artificial intelligence for wind speed prediction, estimating power generation from Vertical Axis Wind Turbines offshore, harnessing wind energy for electricity generation through wind turbines, improving wind power conversion rates with Maximum Power Point Tracking algorithms and hydrogen energy storage systems, and even incorporating bioreactors in wind turbines for biogas generation. These studies collectively highlight the diverse approaches and technologies employed to enhance the energy generation capabilities of wind turbines.

What are the latest developments in vertical axis wind turbine technology?5 answersVertical axis wind turbine (VAWT) technology has seen significant developments in recent years. One area of focus has been on improving the aerodynamic design of VAWTs, such as the Savonius turbine, to enhance efficiency and power output. Optimization methods have been employed to optimize blade geometry and guide gap flow, resulting in higher power coefficients. Another approach has been the development of hybrid VAWTs, which combine the advantages of different turbine types. These hybrid turbines have addressed some of the shortcomings of conventional VAWTs but still have room for improvement. Additionally, research has explored the performance of small-scale hybrid VAWTs that can switch between Darrieus and Savonius configurations, with varying blade length and diameter. The ongoing developments in VAWT technology aim to improve reliability, low wind speed performance, and scalability for decentralized power generation, including offshore environments.

What are the harmful effects of edge contact in gears?5 answersEdge contact in gears can have harmful effects on their performance. The development of the edge effect can lead to misalignment between gear axes and direction deviations of teeth, which accentuates the problem. In modified helical face gears, edge contact can result in increased contact stress and loading issues. Disregarding contact stresses can cause damages in machines, leading to failure by excessive elastic deformation, yielding, and fracture. The meshing process of gear pairs can also be affected by the edge effect, resulting in increased maximum stresses. Additionally, the use of straight lined cutting edges in spiral bevel gears can lead to discontinuous linear functions of transmission errors and increased levels of transmission errors due to alignment errors.

How can a DC motor be used to power a wind turbine?5 answersA DC motor can be used to power a wind turbine by emulating the rotation characteristics of the turbine. This can be achieved by controlling the speed and torque of the DC motor to match the operational parameters of the wind turbine. The DC motor is regulated using techniques such as DC pulse-width modulation to adjust its output characteristics to be equivalent to those of the wind turbine. The emulation system can be simulated in a computational environment and then implemented practically using a DC/DC converter to power the DC motor and reproduce the system characteristics. Experimental tests have been conducted to validate the effectiveness of this approach. By using a DC motor as an emulator, researchers can analyze the static and dynamic responses of the wind turbine system.

What are the challenges in vibration analysis of wind turbines?2 answersThe challenges in vibration analysis of wind turbines include the increase in structural vibrations due to the larger size of wind turbines, which can reduce the lifetime of components and lead to failure or destruction. Another challenge is the difficulty in condition monitoring of gear-based mechanical systems in non-stationary operation conditions, particularly for wind turbines with geared systems where gearbox damages account for a significant amount of unavailability time. Additionally, the nonstationary nature of wind turbine signals poses a challenge for damage detection, leading to the application of statistical parameters and spectral analysis methods to track damage development and distinguish between healthy and unhealthy cases. Furthermore, the dynamic behavior of wind turbines presents challenges in analyzing their dynamic properties, including uncertainty in estimated modal parameters and the applicability limits of identification algorithms.

Does the Gas turbine mechanical efficiency increase with speed?5 answersGas turbine mechanical efficiency can be affected by speed. The study by Sufian found that increasing the gas turbine speed led to an increase in power output and reduced output thrust, while decreasing fuel consumption. However, the study by Ghaderi and Damircheli mentioned that increasing the inlet gas temperature had little effect on turbine efficiency. It is important to note that the effect of speed on mechanical efficiency may vary depending on other factors such as temperature and fuel consumption.

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