多股簧非线性响应模型及其影响研究  

Nonlinear response models of a multi-strand wire helical spring and its influences

作　　者：丁传俊[1] 刘宁[1] 张相炎[1] DING Chuanjun;LIU Ning;ZHANG Xiangyan(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学机械工程学院,南京210094

出　　处：《振动与冲击》2019年第7期139-145,共7页Journal of Vibration and Shock

基　　金：江苏省自然科学基金(BK20140789)

摘　　要：研究了不同多股簧响应模型对火炮自动机运行性能的影响。基于多股簧的静态、动态试验结果,使用参数辨识算法识别了多股簧双折线模型、修正归一化Bouc-Wen模型参数(BW模型),并提出计及冲击端速度的广义修正归一化Bouc-Wen模型(广义BW模型)。基于气体动力学理论和热力学理论,建立了考虑身管和导气室热量散失的某导气式自动机的内弹道/导气装置耦合方程组。通过建立自动机有限元模型并将上述弹簧响应模型和耦合方程组代入计算,分析了不同弹簧响应模型对自动机传动框速度、位移和理论射速的影响。计算结果表明,双折线模型由于迟滞耗能过大、恢复力较低不足以使自动机传动框及时复进到位;BW模型和广义BW模型的自动机运动特性和理论射速比较符合实际;使用广义BW模型计算出的弹簧力大约是BW模型的1.336倍,因此其理论射速高于BW模型。Influences of different response models for multi-strand wire helical spring on operation performance of a machine gun automatic mechanism were investigated. Based on static and dynamic test results of a multi-strand spring, parameters of its double broken line model and modified normalized Bouc-Wen model(BW model) were identified with the parametric identification algorithm, and a generalized BW model for the spring considering impact velocity was also proposed. Based on the aerodynamic theory and the thermodynamic one, the interior ballistic-gas operated device coupled equations for a gas operated automatic mechanism considering heat loss of body tube and gas operated device were derived. A finite element dynamic model for the automatic mechanism was established including the 3 spring response models mentioned above, respectively and the derived interior ballistic-gas operated device coupled equations. Through computation with the finite model, influences of different spring response models on drive box’s speed, displacement and theoretical firing rate were analyzed. The results showed that the double broken line model can’t drive the drive box to its starting place in time due to its excessive hysteretic dissipation energy and lower restoring force;motion features of the automatic mechanism and its theoretical firing rate are more in line with reality using BW model and the generalized BW one;the spring force calculated with the generalized BW model is about 1.336 times of that with BW one, so the theoretical firing rate calculated with the generalized BW model is higher than that with BW one.

关 键 词：多股簧 非线性响应模型 火炮自动机 导气装置 有限元分析 

分 类 号：H122[语言文字—汉语]