Abstract
In order to overcome the great interference of many ancillary facilities in the process of tunnel lining detection, a vehicle-borne high-speed railway tunnel lining detection device was designed based on the arc rotation mechanism to improve the detection efficiency and quality. The device could automatically maintain the antenna–lining distance and carry three radar antennas at one time, which detected the tunnel from the side of the catenary frame without stopping. Through the establishment of the mechanism three-dimensional finite element model, the simulation and analysis of natural frequency and vibration characteristics were carried out, and the results were confirmed by the field dynamic test. It is concluded that the dynamic characteristics can meet the technical requirements under the radial and the longitudinal vibration at 5 km h−1, but the detection data quality of the three radar antennas under the radial vibration is quite different. After optimizing the bent arm material to carbon fiber, the dynamic stability of the mechanism is significantly improved through simulation analysis and the detection speed can be increased to 10 km h−1 with a substantial leap.
Highlights
With the construction and operation of high-speed railway and municipal subway, China has achieved rapid progress in hydraulic tunnel, municipal tunnel, railway tunnel, and underground engineering, which has made China one of the countries with the fastest development, the largest number, and the most complex technical conditions of tunnel engineering in the world.[1]
The transient shock vibration acceleration is controlled within 1g. (b) According to the technical requirements of the WX25T (WX is a code name for special testing vehicles and 25T is the train model number in China) high-speed railway tunnel lining detection vehicle of China Railway Corporation, the longitudinal shock vibration amplitude of each antenna is limited to 30 mm, and the stable amplitude is controlled to 15 mm
The results presented above are in accordance with the technical requirements
Summary
With the construction and operation of high-speed railway and municipal subway, China has achieved rapid progress in hydraulic tunnel, municipal tunnel, railway tunnel, and underground engineering, which has made China one of the countries with the fastest development, the largest number, and the most complex technical conditions of tunnel engineering in the world.[1]. The traditional large-scale mechanical arm has a long telescopic stroke and it is extremely difficult to achieve timely and effective evasion action when detecting high-speed railway tunnel arch waist and arch crown in the face of the long catenary frame. (b) According to the technical requirements of the WX25T (WX is a code name for special testing vehicles and 25T is the train model number in China) high-speed railway tunnel lining detection vehicle of China Railway Corporation (referred to as ‘‘technical requirements’’), the longitudinal shock vibration amplitude of each antenna is limited to 30 mm, and the stable amplitude is controlled to 15 mm. The peak vibration acceleration exceeds 8 m s22, nearly 1g These characteristics will cause great harm to the mechanical arm structure
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