Research On The Elastic Tensioning Device For Rope Drive In Seeker And Accelerated Life Test Model

Rope friction drive is wide used, because it’s easy to achieve, its cost is low and ithas high precision. Under load for a long time, the wire rope is easy to generateelongation deformation, and the drive does not work well because of slip failure.Reaching a certain elongation even easily leads to fall off. However, most currenttransmission wire tensioning devices have complex structure and large size. The elastictensioning device of small size for rope drive is relatively small. For the small size ofrope drive elastic tensioning device, it doesn’t form a complete research system.Especially for the drive systems used in servo of missile systems, there are relativelyfew studies and reports. In this paper, the elastic tensioning device is designed toachieve tension for this particular application.This paper has been completed program selection of tensioning device, structuraldesign and optimization design, and completed the theoretical part of the design. Fourprograms have been designed to meet the structural requirements and assembly space,optimal solution has been elected after comparing. The shape and main dimensions oftensioning device have been determined according to structural mechanics, and thestructures of tensioning device have been improved considering the installation ofassembly problems. Using three-dimensional modeling to simulate, finite elementanalysis results has showed that the tensioning device designed to meets the principlesof equal strength is the optimized structure, and achieve requirements of a uniformstress, minimizing the maximum stress and maximizing deformation.This article has also built the performance test platform of tensioning device tosimulate the rope drive in servo of mechanism process. In order to facilitate dataacquisition and recording, it has designed the loading system and the measurementsystem. Develop assisted craft fixture to ensure that the rope and tensioning device in areliable connection with the institution itself. Through the initial commissioning of testbench, eliminate negative factors that influence the results, and ensure the smoothprogress of the experiment.In the course of the study, this paper has completed the design of the acceleratedlife test model and the choice of accelerated and tested the correctness of the acceleratedmodel after the pilot. Experimental study demonstrates the feasibility of experimentalstage and experiments. Use stress amplitude of rope load as the acceleration factor toestablish the correct acceleration model. Study the relationships of tension and time, andthe connections between load and deformation in tensioning device under alternatingloads. The results show that in the projected lifetime through experiments, preloadingthe tensioning device by the process fixtures that developed, rope tension has a slight decrease, but still maintains50N above, ensuring rope preload under normal operatingconditions.After a comprehensive verification of theoretical and experimental, the tensioningdevice has meet design requirements of large deformation and small stress, ensuredsmall additional mass, and achieved the precision and accuracy in aerospace workingenvironment, providing guidance of the development of the elastic tensioning device forsmall size rope drive.