| Because of the extreme scarceness of forest resources in China and the greatdamages of forest fires, as an important fire prediction technique, the observationplatform for forest fire has been widely used. To a limited extent, the existingobservation platform techniques can be used to carry out the observation of forestfire, but these techniques still exist considerable limitations considering the complexdistribution of forest resources in China.Based on these probles, this paper designs a kind of mobile observationplatform for forest fire. During the working condition, this equipment can lift thevideo capturure device to a level of30meters height from the ground by its liftingsystem and carried out the observation. During the off-working condition, thisequipment can recover its lifting system and travels on the road. It has advantages ofrapidity and mobility, and it can cover a larger area and has a wide range ofobervation angle. It supports multiple signals reception and can also provide asimple office environment.Through the analysis of the project requirements for the mobile observationplatform for forest fire, overall program of the observation platform containsmechanical system, hydraulic driving system, electrical control system and securitysystem. In design of every single system scheme, a variety of design scheme oflifting system, balance leg and control core are analyzed and the optimal scheme ischosen.In this paper, the key technologies of fire obersevation platform including thetelescopic boom luffing system and synchronous telescopic boom system areanalyzed, For the telescopic boom luffing system, the position relationship betweenthe three hinged points contained in the luffing system is optimally designed, andvertical telescopic boom system is put forward. For the synchronous telescopicboom system, a four telescopic boom system consisted of a hydraulic cylinder andthe synchronous pulley-steel wire rope system is designed to implement thesynchronous driving. The mutual slider-guide telescopic boom movement system isdeveloped. At the same time, the finite element analysis is used to carry out themechanics analysis of the designed mechanical structure. For the weak links of themechanical structrue, the strengthening measures are used to ensure the mechanicalproperties of the mechanical structure and then meet the requirements.Aiming at the wind resistance requirement, this paper studies thewind-resistance capability of the observation platform. Optimal structure of theobservation platform is designed to resist the load of wind. The automatic leveling scheme is proposed. The control model of the automatic leveling system isestablished and the simulation experiments is carried out to analyze whether thedynamic response of the leveling system meets the requirement for the movement ofthe hydraulic legs.The vibration performance of the observation platform is studiedusing the finite element analysis, and the analysis provides the theoretical basis forthe wind vibration control. Meanwhile, the paper analyzes the deformation of thetelescopic boom and the ability to resist overturning of the platform under the loadof tenth level wind by finite element analysis, and provides the basis for therationality of the design optimization. |
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