Nonlinear Dynamic Analysis And Dynamic Behavior Control Of Back Rest System Of Air-jet Loom

Following the enhance of air-jet loom's adaptability, the air-jet loom industry achieves rapid development currently. To obtain higher production efficiency, the design speed of air-jet loom is faster and faster. But in high-speed conditions, the vibration of loom will be intensified. If such problems are treated irrationality, it will cause more broken ends and drop of productivity. As one of the most important part of air-jet loom, back rest system is the detected and adjusted structure of warp tension, and its dynamic behavior reflects the fluctuation of warp tension. This paper make the back-rest system of WG-2000 Air-Jet Loom as object, study the nonlinear dynamic characteristic of its SDOF function, control the oscillations of back-rest, decrease warp tension and its fluctuation.Firstly, the dynamic model of the back-rest system of WG-2000 Air-Jet Loom is simplified, and its main non-linear items are extracted, then relevant nonlinear vibration analysis is made, mainly about primary resonance and parametric resonance, and the influence by transformation of the parameters. Afterwords, the effection of primary and parametric resonance on back-rest system with different rotating speed of loom is discussed.Secondly, the magneto-rheological damper(MR damper) be introduced, to replace the liner damper. The emulated experiments prove that the back-rest system with MR damper has fewer oscillations, comparing with the back-rest system with liner damper. Also, use PID control and fuzzy PID control methods, in order to further optimize back-rest system performance.The nonlinear dynamic analysis to SDOF function of the back-rest system can be benefit for engineering design and improvement of weaving technology. And also the emulated experiments about the back-rest system with MR damper can be reference of the research of application of MR damper on air-jet loom.