水陆两栖飞机起落架水环境适应性验证要求与方法

通过水浸润、水冲击、结冰、海洋腐蚀等水环境对起落架的影响及其损伤失效模式的分析研究,提出了水陆两栖飞机起落架水环境验证要求。综合考虑环境适应性验证规范、标准的合理选用和剪裁,建立了水陆两栖飞机起落架水环境试验验证方法,涵盖静水密试验、连续水冲击试验、泥沙水试验、结冰试验以及海洋环境腐蚀试验的条件和方法,以期为水陆两栖飞机起落架的环境适应性设计与验证提供支持。     

基于GWO-VMD算法的齿轮故障自适应特征提取

目的 齿轮产生故障时,利用其声发射信号进行自适应特征提取后诊断。方法 利用变分模态分解方法（VMD）对齿轮发生故障时的声发射信号进行分解。在现实状况中,采集声发射原信号噪声干扰大,导致特征提取准确度低,并且模态分解时参数需要人为调试设定。鉴于此,引入灰狼优化算法（GWO）,对模态分解个数k和二次惩罚因子α自适应选择最优参数后,对信号分解得到本征模态函数（IMF）。通过相关系数选出最佳IMF作为特征分量,计算其峭度和样本熵。结果 计算了各分量的相关系数,选取与原始信号最为相近的分量,分别计算其峭度和样本熵。分解后,齿轮故障声发射信号峭度高于正常的情况,而样本熵则偶然性表现为正常情况下的值大于故障条件下的值。结论 采用支持向量机对特征向量集进行分类识别,对比改进后的试验结果,GWO-VMD结合峭度–样本熵的方法能够有效地提取故障特征,判断齿轮状态是否健康。     

论我国能源法的立法目的——兼评2020年《能源法（征求意见稿）》第一条

我国2020年《能源法（征求意见稿）》的立法目的在结构层次、推演逻辑等方面均有不足,无法统摄整个能源立法实践,极大影响了能源法的立法质量。不同的立法目的产生不同的法律实效,我国能源法的立法目的不仅取决于能源法的位阶,而且必须以实现“双碳”目标为价值指引。能源法需要遵循从“理念”到“价值”再到“目的”的推导逻辑,从形式诉求和实质要义出发,设置逻辑严密、层次清晰的立法目的条款。     

SCR脱硝技术在沧东电厂4号机组中的应用

以沧东电厂4号机组进行的脱硝改造工程为例,阐述了选择性催化还原(SCR)烟气脱硝系统的工作原理,并对SCR反应器、催化剂等脱硝设备的特点进行了详细地介绍,同时对4号机组加装脱硝装置后对空预器、引风机的影响进行了详细地分析,并针对其影响提出了具体的改造措施。     

Use of Fully Biodegradable Panels to Reduce Derelict Pot Threats to Marine Fauna

Fishing pots (i.e., traps) are designed to catch fish or crustaceans and are used globally. Lost pots are a concern for a variety of fisheries, and there are reports that 10 – 70% of deployed pots are lost annually. Derelict fishing pots can be a source of mortality for target and bycatch species for several years. Because continual removal of derelict gear can be impractical over large spatial extents, modifications are needed to disarm gear once it is lost. We tested a fully biodegradable panel with a cull or escape ring designed for placement on the sides of a crab pot that completely degrades into environmentally neutral constituents after approximately 1 year. This panel is relatively inexpensive, easy to install, and can be used in multiple fisheries. We used the blue crab (Callinectes sapidus) fishery as a test case because it is a large pot fishery and blue crab pots are similar to traps used in other pot fisheries. We had commercial fishers deploy pots with panels alongside standard pots in Chesapeake Bay (U.S.A.) to assess potential effects of our experimental pots on blue crab catch. We compared the number, biomass, and size of crabs captured between standard and experimental pots and evaluated differences in catch over a crabbing season (March–November) at five locations. There was no evidence that biodegradable panels adversely affected catch. In all locations and time periods, legal catches were comparable in abundance, biomass, and size between experimental and standard pots. Properly designed biodegradable panels appear to be a viable solution to mitigate adverse effects of derelict pots. Uso de Paneles Completamente Biodegradables para Reducir las Amenazas de Vasijas Abandonadas para la Fauna Marina     

Gear oil formulation designed to meet bio-preferred criteria as well as give high performance

A bio-based gear oil was developed from soybean oil (SBO). The SBO was first thermally polymerised and then mixed with additives and diluents. The effect of pour point depressants, co-base oils, antioxidants and anti-wear additives is reported. Lubricity, viscosity index and oxidation stability of the final formulation of the bio-based gear oil are compared with commercially available gear oils. The final formulation of bio-based gear oil gives test results: viscosity index 165, four-ball wear scar 0.375 mm. These numbers are comparable to or better than the commercially available gear oils tested for comparison. The oxidation onset temperature of the bio-based gear oil, 220°C, is lower than the evaluated commercial products, but still at an acceptable range for gear oil.     

电梯安全钳制动过程分析

安全钳是电梯设备的重要安全装置,是增强电梯安全性的重要组成部分。现行的国标GB7588—2005和欧洲标准EN81中只对电梯制动的平均减速度做了规定。本文应用计算软件辅助计算,对电梯的安全钳制动过程进行定量模拟,以更好对电梯安全钳制动过程有深入的了解,并对更好地认识安全钳的工作过程有重要意义。     

交通行业标准《围油栏》有关问题的说明

交通行业标准《围油栏》(JT／T465-2001）已于2002年5月1日起实施。为了便于有关人员理解标准的主要内容，更好地使用该标准，就标准制定过程中的有关问题和部分条款做了简要说明。     

圆柱齿轮冷锻成形技术探讨

探讨了几种圆柱齿轮冷锻成形技术 ,对圆柱齿轮冷锻特性进行了分析 ,并运用系统的观点对提高冷锻圆柱齿轮的轮齿精度做了探讨     

无增压风机湿法烟气脱硫技术及其应用情况

本文介绍了浙江某发电厂的脱硫系统不配备增压风机，利用锅炉引风机提供脱硫阻力降，简化了脱硫系统。减少了设备购置费用，降低了设备运行维护成本。