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排序方式: 共有107条查询结果,搜索用时 15 毫秒
11.
一种面向海事分支机构的船舶安全管理信息系统的设计 总被引:1,自引:0,他引:1
针对直属海事局分支机构船舶安全管理业务的需求,提出一种船舶安全管理信息系统的设计思路。该系统将电子海图平台、船舶交通动态数据和船舶安全管理信息集成,以实现船舶安全管理数字化、信息化、网络化。从系统技术实现角度,对信息管理系统作出详细的设计与分析。 相似文献
12.
同步定位卫星通信系统是集精确定位与短文字通信于一体.为海上船舶监控管理提供一个平台。为减小海上船舶海损事故的发生,提高船舶监管能力,探讨基于同步定位卫星通信系统的船舶监控管理系统的特点,以对海上船舶进行监控管理、遇险救助等。 相似文献
13.
A method to identify vortex-induced forces and coefficients from measured strains of a Steel Catenary Riser (SCR) undergoing vessel motion-induced Vortex-induced Vibration (VIV) is proposed. Euler–Bernoulli beam vibration equations with time-varying tension is adopted to describe the out-of-plane VIV responses. Vortex-induced forces are reconstructed via inverse analysis method, and the Forgetting Factor Least Squares (FF-LS) method is employed to identify time-varying vortex-induced force coefficients, including excitation coefficients and added mass coefficients. The method is verified via a finite element analysis procedure in commercial software Orcaflex. The time-varying excitation coefficients and added mass coefficients of an SCR undergoing vessel motion-induced VIV are investigated. Results show that vessel motion-induced VIV is excited at the middle or lower part of the SCR and in the acceleration period of in-plane velocity, where most of the excitation coefficients are positive, while during the deceleration period, the excitation coefficients becomes too small to excite VIVs. Parameter γ [1] has strong correlation with excitation coefficients. In addition, time-varying tensions contribute significantly to the variations of added mass coefficients under the condition that the ratio of dynamic top tension to pretension exceeds the range of 0.7–1.3. Moreover, chaotic behaviors are observed in vortex-induced force coefficients and are more evident with the increase of vessel motion velocity. This behavior may attribute to the randomness existing in in-plane velocity and its coupling with out-of-plane vibrations. 相似文献
14.
Transient design waves for green-water loading on bulk carriers 总被引:1,自引:0,他引:1
K. R. Drake 《Journal of Marine Science and Technology》2000,5(1):21-30
The wave surface profiles associated with extreme relative motion between a slender stationary vessel and the adjacent wave
surface are investigated for long-crested head seas. The methodology is based upon an established statistical relationship
for a Gaussian random process which indi-cates that in the vicinity of an extreme event the most probable shape of the time
history approaches that of the autocorrelation function. Attention is given to the relative motion at a longitudinal position
which is representative of the No. 1 hatch cover location on a bulk carrier. Second-order corrections to the wave surface
profiles are used to provide estimates of nonlinear relative motions. It is shown that extreme relative motion at the hatch
cover location is associated with the vessel encountering a steep-fronted wave with pronounced asymmetry in the horizontal
and vertical directions. In order to evaluate the exceedence probabilities, it is hypothesized that the peaks of the nonlinear
relative motions are closely correlated with the peaks of an underlying linear process. The overall methodology is applied
to an investigation of relative motion exceedence probabilities for vessel lengths of 250 m and 300 m over a range of survival
seastates.
Received: July, 1999 / Accepted: November, 1999 相似文献
15.
船舶在航行过程中应遵循安全、经济的原则,其中安全尤为重要。文中就如何保证船舶安全航行作了一些深入的调查与研究,得出了保持正规了望、正确使用航海雷达、严格落实值班制度和尽量避免紧迫局面等几个切实可行的方法,以期引起航海者的高度重视,极其谨慎地驾驶船舶,以避免出现碰撞事故。 相似文献
16.
弹簧安全阀的常见故障及其处理 总被引:2,自引:1,他引:1
分析了中、低压锅炉及压力容器上弹簧安全阀的常见故障及产生原因 ,提出了相应的解决措施。实践证明这些措施是有效的 相似文献
17.
18.
Owen Tang 《Maritime Policy and Management》2013,40(5):541-542
The summer minimum extent of Arctic sea ice shrank drastically in these years, and the opportunity on Arctic international shipping emerged. The Northern Sea Route (NSR), formerly blocked by permanent ice, was completely ice-free in September in the past 3 years. Because this route is much shorter than conventional Asia–Europe shipping lane, many maritime countries have paid attention to exploit the enormous potential of the Arctic Ocean from economical consideration. This study measured the economical advantage of the seasonal NSR by calculating the shipping cost saved. 相似文献
19.
文中根据洋山港主航道和集装箱码头现状,结合18 000TEU集装箱航行特点,在分析水域通航环境影响因素和港区现有的航行保障措施的基础上,提出进出港航行注意事项和加强通航安全管理的建议,以保障进出港航行安全。 相似文献
20.