摘要：针对柱形壳在制造过程中的厚度均匀性和成形性能差等问题,提出采用橡胶内高压胀形工艺进行柱形壳的成形,并通过优化肩部传力区域的工艺参数来提高柱形壳的成形性能。基于响应面法中的Box-Behnken Design进行试验方案的设计,建立并优化了以模具结构中肩部传力区域的内圆角半径、外圆角半径、斜边角度和摩擦因数为设计变量,以最大减薄率为响应值的响应面模型,并通过对响应面模型进行方差分析和相关性分析,确定了柱形壳内高压胀形的最佳工艺参数组合为:内圆角半径为9.89 mm,外圆角半径为1 mm,斜边角度为10.13°,摩擦因数为0.104。采用最佳的工艺参数进行柱形壳内高压胀形模拟分析和试验,验证了响应面模型优化的可靠性和模拟分析的准确性。

摘要：钢筋混凝土柱形壳的凹面侧弧形受拉钢筋有拉直的趋势,从而对混凝土保护层产生径向压力,可能使混凝土保护层剥落,导致结构失效.为了避免上述问题,通过建立"柱形壳凹面侧弧形受拉钢筋自锚固计算模型",找出了凹面侧弧形受拉钢筋在"不设横向附加锚固钢筋"时的"自锚固"特点,进而将该成果应用于钢筋混凝土双曲线冷却塔塔筒、取水隧道、输水管道等结构的设计。

摘要：选用有限元仿真方法,研究了在均布外压作用下,周向波纹圆柱壳的屈曲问题、以及波纹幅值对柱壳屈曲的影响。首先,设计了1个普通圆柱形耐压壳和2个周向正弦波纹柱形耐压壳,对理想柱壳进行线性屈曲分析,并观察波纹幅值对柱壳屈曲的影响规律;然后为了验证理想柱壳线性屈曲分析的可靠性,要对真实波纹柱壳进行非线性屈曲分析。理想波纹柱壳的线性屈曲分析与真实波纹柱壳的非线性屈曲分析一致表明,随着波纹幅值的增大,圆柱壳抵抗屈曲变形的能力也随之增大,并且理想波纹柱壳的线性失稳模式与真实波纹柱壳后屈曲失稳模式一致。

摘要：Longitudinal and horizontal vibration must both be reduced in an effective vibration isolation system. We present a cylindrical shell vibration isolator as a dynamic system composed of four springs and dampers. Vibration is directly produced by the motion of machinery, and more is subsequently generated by harmonic frequencies within their structure. To test the effectiveness of our isolator, we first determined equations for the transmission of vibration from the machine to its cylindrical shell. Damping effects produced by the vibration parameters of our system are then analyzed.

摘要：In naval architectures, the structure of prismatic shell is used widely. But there is no suitable method to analyze this kind of structure. Stiffened prismatic shell method (SPSM) presented in this paper, is one of the harmonic semi-analytic methods. Theoretically, strong stiffened structure can be analyzed economically and accurately. SPSM is based on the analytical solution of the governing differential equations for orthotropic cylindrical shells. In these differential equations, the torsional stiffness, bending stiffness and the exact position of each stiffener are taken into account with the Heaviside singular function. An algorithm is introduced, in which the actions of stiffeners on shells are replaced by external loads at each stiffener position. Stiffened shells can be computed as non-stiffened shells. Eventually, the displacement solution of the equations is acquired by the introduction of Green function. The stresses in a corrugated transverse bulkhead without pier base of an oil tanker are computed by using SPSM.