Wheel Dynamic Response to Rolling Excitation on Road

Abstract

Abstract. In this paper, tyred wheel dynamic response to road excitation during rolling has been simulated using finite element modelling in a graphical programming environment. The actual contact is an area not a single line and the contact edges are subject to continuous impacts during the rolling. The structural response to the impact generates structure borne noise as part of pollution to the environment. To reduce the wheel noise can be achieved by attenuating the intensity of structural vibration. The relationship between the noise generation energy of wheel and damping is investigated. It is proposed to reduce the noise by increasing the damping in the tyre structure. The effectiveness has been demonstrated by the simulation result.

Non-uniform temperature distribution of the main reflector of a large radio telescope under solar radiation

“…The thermal design and thermal behavior of radio telescopes have been studied internationally through finite element (FE) analysis and experimental tests, such as the thermal design of the quadripod and backup structure of the IRAM 30-m telescope (Greve et al 2005), the thermal behavior of the yoke, main reflector and backup structure of the ALMA 12-m prototype antenna (Greve & Mangum 2008), the thermal analysis of the alidade of the Sardinia 64-m telescope (Pisanu et al 2014), and so on. In China, the related studies have also been carried out in several radio telescopes in recent years, including the thermal analysis of the main active reflector and supporting structure of the FAST 500-m radio telescope (Song & Wang 2016;Wang et al 2017), the thermal behavior of the alidade and backup structure of the Tianma 65-m radio telescope (Fu et al 2016;Dong et al 2018), the thermal effects of the alidade of the Miyun 50-m radio telescope (Kong et al 2019) and the Wuqing 70-m radio telescope (Wei et al 2021). In particular, several experimental studies on the temperature field of the main reflector are conducted in some small testing radio telescopes, as a 3-m radio telescope in Harbin Institute of Technology (Chen et al 2016) and a 7.3-m radio telescope in Xidian University (Lian et al 2020).…”