RTI测试研究

运行支撑系统(RTI)作为应用高层体系结构(HLA)进行分布仿真的支撑系统,是实现HLA的核心。RTI的功能和性能直接关系到HLA仿真系统开发与应用的成败。首先阐述了RTI测试的内容和指标,接着结合例子详细研究了RTI测试的方法,最后对RTI测试研究进行了总结,为提高基于HLA的分布交互仿真系统的质量及可信度提供了基础。     

Effect of wave shaper on reactive materials jet formation and its penetration performance

Wave shaper effect on formation behavior and penetration performance of reactive liner shaped charge (RLSC) are investigated by experiments and simulations. The reactive materials liner with a density of 2.3 g/cm³ is fabricated by cold pressing at a pressure of 300 MPa and sintering at a temperature of 380 °C. Experiments of the RLSC with and without wave shaper against steel plates are carried out at standoffs of 0.5, 1.0, and 1.5 CD (charge diameter), respectively. The experimental results show that the penetration depths and structural damage effects of steel plates decrease with increasing the standoff, while the penetration depths and the damage effects of RLSC without wave shaper are much greater than that with wave shaper at the same standoff. To understand the unusual experimental results, numerical simulations based on AUTODYN-2D code are conducted to discuss the wave shaper effect, including the propagation behavior of detonation wave, the velocity and temperature distribution of reactive jet, and penetration depth of reactive jet. The simulations indicate that, compared with RLSC without wave shaper, there is a higher temperature produced inside reactive jet with wave shaper. This unusual temperature rise effects are likely to be an important mechanism to cause the initiation delay time of reactive jet to decline, which results in significantly decreasing its penetration performance.     

顶置武器站性能评估方法

在评估指标体系和虚拟样机仿真测试评估数据的基础上,对顶置武器站性能评估进行研究。对评估方法进行研究,提出了适合顶置武器站性能评估特点的灰色模糊综合评估法,选用灰色关联度分析计算指标权重,建立开放性的隶属矩阵,最终建立顶置武器站性能评估模型。通过实例评估表明该评估模型准确可靠。     

Estimating failure time distribution and its parameters based on intermediate data from a Wiener degradation model

Instead of measuring a Wiener degradation or performance process at predetermined time points to track degradation or performance of a product for estimating its lifetime, we propose to obtain the first‐passage times of the process over certain nonfailure thresholds. Based on only these intermediate data, we obtain the uniformly minimum variance unbiased estimator and uniformly most accurate confidence interval for the mean lifetime. For estimating the lifetime distribution function, we propose a modified maximum likelihood estimator and a new estimator and prove that, by increasing the sample size of the intermediate data, these estimators and the above‐mentioned estimator of the mean lifetime can achieve the same levels of accuracy as the estimators assuming one has failure times. Thus, our method of using only intermediate data is useful for highly reliable products when their failure times are difficult to obtain. Furthermore, we show that the proposed new estimator of the lifetime distribution function is more accurate than the standard and modified maximum likelihood estimators. We also obtain approximate confidence intervals for the lifetime distribution function and its percentiles. Finally, we use light‐emitting diodes as an example to illustrate our method and demonstrate how to validate the Wiener assumption during the testing. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008     

硅整流无刷发电机供电系统动态性能的研究

分析了坦克的供电系统中采用硅整流无刷发电机时的工作特点,建立了这种系统的数学模型,举例说明了计算方法,并在文章的最后进行了评价.     

装甲车辆起动电动机综合试验台

采用较先进的磁粉制动器作为电机的负载,使电机加载平稳、可靠、恒定,并可连续调节负载大小;同时采用高精度的ZJ型转矩转速传感器并配合转矩转速仪,不但能测量电机稳态时的转矩、转速和功率,同时还可测试电机某一过渡过程中转矩、电流、转速随时间变化的数值并贮存或打印.     

综合飞行/火力控制系统性能评价

详细介绍了综合飞行 /火力控制系统 (IFFCS)性能评价的方法。该方法把评价过程分为单元评价、组合评价和系统性能评价 ,将系统性能指标逐层分解 ,以保证闭合系统最终能完成自动攻击任务。以高性能控制系统仿真软件MATTRIXX6 .0为平台 ,按此方法开发的评价软件获得了用户的认可     

空泡螺旋桨在任意形状船体上诱导的脉动压力数值预报方法研究

研究了空泡螺旋桨在任意形状船体上诱导的脉动压力的一种数值预报方法 .该方法采取了在船体表面布置偶极子的办法 ,取代了传统的固壁因子 .对放置在自由表面上的平板船体模型进行了计算 ,并将计算结果同理论估算方法的结果进行了比较 ,说明本计算方法是可行的     

柴油机燃油喷射系统故障的数值模拟计算

采用数值模拟的方法对燃油喷射系统的工作过程作了简要的理论分析 .以典型的 135型柴油机燃油喷射系统为研究对象 ,在合理假设的基础上 ,建立了燃油喷射系统的数学模型 ,并应用特征线法和改进欧拉法 ,对其工作过程进行了初步的数值求解计算 ,模拟了燃油喷射系统部分常见故障时的工况     

高原环境对军用油料装备柴油动力性能影响分析

针对青藏高原特殊地理环境和气候条件特点,通过某大型群车加油车在高原地区的训练使用,分析海拔高度与大气压力、空气密度和温度的对应关系,探讨了在高原环境条件下使用油料装备其柴油动力的动力性、经济性及低温起动性能受到的影响,提出了相应的改进措施。