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A phenomenological model for plastic flow behavior of rotating band material with a large temperature range
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作者 Yi-cheng Zhu Jia-wei Fu +1 位作者 lin-fang qian Jing-hua Cao 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2023年第7期121-133,共13页
The plastic flow behavior of the rotating band material is investigated in this paper. The rotating band material is processed from H96 brass alloy, which is hardened to a much higher yield strength compared to the an... The plastic flow behavior of the rotating band material is investigated in this paper. The rotating band material is processed from H96 brass alloy, which is hardened to a much higher yield strength compared to the annealed one. The dynamically uniaxial compression behavior of the material is tested using the split Hopkinson pressure bar(SHPB) with temperature and strain rate ranging from 297 to 1073 K and500 to 3000 s^(-1), respectively, and a phenomenological plastic flow stress model is developed to describe the mechanical behavior of the material. The material is found to present noticeable temperature sensitivity and weak strain-rate sensitivity. The construction of the plastic flow stress model has two steps. Firstly, three univariate stress functions, taking plastic strain, plastic strain rate and temperature as independent variable, respectively, are proposed by fixing the other two variables. Then, as the three univariate functions describe the special cases of flow stress behavior under various conditions, the principle of stress compatibility is adopted to obtain the complete flow stress function. The numerical results show that the proposed plastic flow stress model is more suitable for the rotating band material than the existing well-known models. 展开更多
关键词 Rotating band Plastic flow behavior Large temperature range Phenomenological model
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Dynamic modeling and parameter identification of a gun saddle ring 被引量:5
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作者 Tong Lin lin-fang qian +2 位作者 qiang Yin Shi-yu Chen Tai-su Liu 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2020年第2期325-333,共9页
In this study,a theoretical nonlinear dynamic model was established for a saddle ring based on a dynamic force analysis of the launching process and the structure according to contact-impact theory.The ADAMS software ... In this study,a theoretical nonlinear dynamic model was established for a saddle ring based on a dynamic force analysis of the launching process and the structure according to contact-impact theory.The ADAMS software was used to build a parameterized dynamic model of the saddle ring.A parameter identification method for the ring was proposed based on the particle swarm optimization algorithm.A loading test was designed and performed several times at different elevation angles.The response histories of the saddle ring with different loads were then obtained.The parameters of the saddle ring dynamic model were identified from statistics generated at a 500 elevation angle to verify the feasibility and accuracy of the proposed method.The actual loading history of the ring at a 70°elevation angle was taken as the model input.The response histories of the ring under these working conditions were obtained through a simulation.The simulation results agreed with the actual response.Thus,the effectiveness and applicability of the proposed dynamic model were verified,and it provides an effective method for modeling saddle rings. 展开更多
关键词 GUN SADDLE RING DYNAMIC response PARAMETER identification Particle SWARM optimization
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The uncertainty propagation analysis of the projectile-barrel coupling problem 被引量:5
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作者 lin-fang qian Guang-song Chen 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2017年第4期229-233,共5页
Based on the model which couples the projectile and gun barrel during an interior ballistic cycle,the uncertainty propagation analysis of the model is presented caused by the uncertainty of the input parameters.The Bo... Based on the model which couples the projectile and gun barrel during an interior ballistic cycle,the uncertainty propagation analysis of the model is presented caused by the uncertainty of the input parameters.The Bootstrap method is employed to calculate the statistical moments(i.e.the mean,variance,skewness coefficient and kurtosis coefficient)of the parameters of the projectile.Meanwhile,the maximum entropy method is used to estimate the probability density function(PDF)and the cumulative density function(CDF),the interval of the parameters of the projectile are also given.Moreover,the results obtained are compared to the results calculated by Monte Carlo(MC)method to verify the effectiveness of the presented method.Finally,the rule and the uncertainty propagation model of the projectile-barrel coupling system are given with the variation of the uncertainties of the input parameters. 展开更多
关键词 Uncertainty propagation Projectile-barrel coupling BOOTSTRAP MAXIMUM ENTROPY INTERVAL
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Barrier Lyapunov functions-based dynamic surface control with tracking error constraints for ammunition manipulator electro-hydraulic system 被引量:2
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作者 Shou-Cheng Nie lin-fang qian +2 位作者 Long-Miao Chen Ling-Fei Tian Quan Zou 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2021年第3期836-845,共10页
This paper focuses on the dynamic tracking control of ammunition manipulator system. A standard state space model for the ammunition manipulator electro-hydraulic system(AMEHS) with inherent nonlinearities and uncerta... This paper focuses on the dynamic tracking control of ammunition manipulator system. A standard state space model for the ammunition manipulator electro-hydraulic system(AMEHS) with inherent nonlinearities and uncertainties considered was established. To simultaneously suppress the violation of tracking error constraints and the complexity of differential explosion, a barrier Lyapunov functionsbased dynamic surface control(BLF-DSC) method was proposed for the position tracking control of the ammunition manipulator. Theoretical analysis prove the stability of the closed-loop overall system and the tracking error converges to a prescribed neighborhood asymptotically. The effectiveness and dynamic tracking performance of the proposed control strategy is validated via simulation and experimental results. 展开更多
关键词 Ammunition manipulator Electro-hydraulic system Error constraints Tracking control
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