片梭的力学行为和失效分析

片梭是片梭织机的关键零件,使用寿命很短。本文通过失效分析,查明其疲劳断裂的原因是预变形时在片梭臂的内侧表面留下了残余拉伸应力。试验表明:50CrVA钢制作的片梭经适当的热处理,再经分段加力预变形,可在片梭臂的危险截面处获得压缩残余应力,使用寿命提高到1200万次以上。     

The influence of confinement on the penetration of ceramic targets by KE projectiles at 1.8 and 2.6 km/s

This paper presents the results of scale size experiments using a tungsten-alloy long-rod projectile fired against 97.5% Al₂O₃ ceramic targets at 1.8 and 2.6 km/s. Two targets were used, one having lateral steel confinement; the other without. The projectile overmatched the target, and residual projectile length and velocity were recorded using ballistic-syncro photography. Flash radiography was used during penetration of the unconfined target to obtain the penetration velocity. Manganin pressure gauges were also used to obtain additional data on the response of the ceramic target during penetration. Results from the eight experiments indicate that the confinement reduced the residual energy of the projectile at both impact velocities. Expressed in terms of the projectile impact energy, 55–56% was lost in the unconfined target at 2.6 km/s compared with 60% for the confined design. The same trend was found at 1.8 km/s with 68% and 72–73% for the unconfined and confined, respectively. Predictions using the QinetiQ GRIM2D hydrocode and a simplified form of the Johnson–Holmquist ceramic material model agreed well with the experiments for three out of the four test configurations. The predicted projectile erosion and retardation against the confined target at 1.8 km/s was excessively high. Analytical predictions using the Tate modified Bernoulli equation also gave reasonably accurate predictions for three of the tests, but values for the Tate target ‘strength’ extracted from experiments using a different target configuration were not accurate for the target design used in this paper.     

渐速膛线身管内弹丸贴膛一般运动的研究

建立了非对称弹丸在挠性渐速膛线身管内作贴膛一般运动的微分方程组，求解了对称弹丸在渐速膛线理想身管内的贴膛运动规律。     

用方正奥思制作多媒体课件的研究

方正奥思是一种较为实用的具有全中文操作界面的多媒体创作工具,文中详细介绍了利用方正奥思制作课件平抛物体运动的设计思路、制作步骤及方法,并对课件特色加以简要分析。     

弹引系统膛内动态特性研究

目前，我国引信设计使用的火工品性能参数都是静态测定的结果，而引信设计需要的是火工品的动态性能参数，采用试验建模与理论建模相结合的方法，研究了弹引系统膛内动态特性，设计加工了试验弹，对它进行单点激励单点响应的锤击模态实验，绘制了弹引系统传递函数，相干函数，实频及虚频图，识别了固有频率，阻尼等低阶模态参数，建立了弹引系统的试验模型；在试验模型的基础上进行理论建模。用试验模型验证和修正理论模型，得到了更     

弹丸结构图形数据的自动采集

以ＡｕｔｏＣＡＤ图形软件包为二次开发对象，分析了图形实体数据结构的特征，提出了弹丸结构图形的图层预处理方法，介绍了弹丸结构图形的实体数据自动采集的基本原理，用ＡｕｔｏＬＩＳＰ语言开发了数据采集程序，并将图形数据的采集结果经过筛选和析取处理，按一定的格式要求存入中间数据库。     

末敏弹刚柔二体相互作用力学模型探讨

讲述了在建立带伞末敏弹的运动方程时考虑柔性伞与刚性弹之间相互作用的方法，这是建立带伞末敏弹运动方程的关键。把降落伞与弹之间的相互作用当作刚体对刚体的处理方法将会导致所建立的方程计算失败。     

薄壁弹体压药强度的理论计算与试验研究

弹体的强度是弹丸在压药及发射过程中安全的重要保证，本文通过建立有限元模型分析计算了薄壁弹体压药过程中的应力场，同时采用应变片测量方法测取了薄壁弹体的压药时各点时的应力值，从而能较准确地较核弹体的压药过程中的结构强度和弹体变形。     

A fresh look at the free flight dynamics of a spinning projectile

In the first part of the paper, several equations of motion by different groups of workers are critically examined. Exact equations of motion are then developed. This form is then quasi-linearised into a ballistic formulation. The geometrical motion of a spinning projectile, in the presence of a cubic restoring moment is analysed in the cross-flow plane. It is observed that the trajectories assume a cuspidal form at the lower and upper range of the travel, when the angular momentum parameter coincides with these points. In general, both steady and unsteady precessional motions are presented.     

应用系统工程于扩大火炮射程的研究

射程为火炮主要指标之一。本文应用系统工程思想与方法,就扩大火炮射程问题进行了讨论。经分析指,出运用火箭弹以增程的方法是可取的。