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为弥补被动隔振系统抗冲击设计中存在的不足,根据最优抗冲理论,设计了磁流变阻尼器与隔振器并联的隔振抗冲击系统。针对磁流变阻尼器非线性强、PID控制参数难实时调节等问题,设计了模糊PID控制器并进行了模拟仿真。通过对不同抗冲方法和极限情况的仿真证明:基于模糊PID控制的磁流变半主动最优抗冲设计可以在保证设备安全的前提下,减小冲击加速度和系统位移,提高被动隔振系统的抗冲击性能。 相似文献
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基于飞机着陆和滑行过程中,飞机起落架中磁流变阻尼器的阻尼力的不可控的问题。提出基于磁流变液的飞机起落架嵌入式缓冲控制器设计方法,设计了针对控制磁流变阻尼器阻尼力的缓冲控制系统,主要包括嵌入式数字信号处理器DSP的选择,控制系统的原理设计,电源产生电路和复位电路模块,JTAG仿真电路模块,A/D采样校正模块,D/A转换模块,压控电流源驱动模块。通过电路模块的仿真,由控制系统中压控电流源出来的电流在阻尼器接受范围之内,证明了设计的磁流变缓冲控制器能对阻尼力的大小进行控制,对飞机起落架的缓冲系统起到调节作用。 相似文献
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柴油机模糊控制设计仿真与分析 总被引:5,自引:0,他引:5
黄军 《装甲兵工程学院学报》2006,20(4):36-39
针对柴油机难以采用常规PID控制的问题,应用模糊控制理论,对柴油机进行了模糊控制器的设计,在建立的模拟仿真系统上,进行了模糊控制下的柴油机的空载自由加速过程的模拟,并与PID控制下相同过程的速度、扭矩、燃油量随时间变化曲线进行了比较和分析。结果表明:与常规PID控制相比,模糊控制的效果满足要求,能解决柴油机的复杂控制问题。 相似文献
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在飞机地面模拟试验台台架控制的液压伺服系统中,由于其系统存在强非线性,传统PID控制难以使液压马达转角达到精准良好的控制效果.针对这个问题,同时为提高控制系统性能,将基于TS模糊神经网络PID控制的智能控制算法应用于液压马达伺服控制系统中.在建立飞机台架液压伺服模型的基础上,利用基于TS模糊模型的神经网络对PID参数进行自适应整定,并基于MATLAB/Simulink平台进行相应的仿真实验.仿真结果表明,TS模糊神经网络PID控制器相比于传统PID控制器和普通模糊PID有着更好的响应特性,呈现出更佳的控制效果,使飞机台架控制系统的综合性能得到了提高. 相似文献
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基于Conolly理论建立了船舶模型,以横摇角和横摇角速度为输入量,鳍角为输出量,应用模糊控制理论设计了减摇鳍模糊控制器;利用Matlab的fuzzylogic工具箱针对不同海情对控制器进行了仿真.结果表明,减摇鳍模糊控制器与传统PID控制器相比具有更好的控制效果. 相似文献
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Lord Aikins Adusei 《African Security Review》2013,22(3):332-359
Energy continues to serve as the bedrock of modern economies and the main driver of modern society. For Africa, the production and supply of energy resources such as crude oil, natural gas, uranium, coal, biomass, biofuels and other renewables are an important source of employment, rents, taxes, royalties and profits. This sector brings in several tens of billions of dollars of revenue annually. The production and delivery of such resources, however, depend on critical infrastructures such as pipelines, refineries, processing plants, terminals, rigs, electrical energy pylons, substations, pump stations, vessels, and tankers. These infrastructures have been attacked by terrorists, insurgents, vandals and saboteurs, all of whom see them as targets against which to register their grievances and extract concessions from the state. This paper is a chronological account of some of the documented incidents of terrorism, insurgency, kidnapping, destruction, sabotage, and human casualties suffered in the oil and gas sectors in Africa between 1999 and 2012. It is based on data extracted from the databases of the RAND Database of World Terrorism Incidents and the University of Maryland's Global Terrorism Database (GTD). 相似文献
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In the Post-Bipolar Era the growing complexity of the military operations requires a new approach for the resolution of international crises. Since the end of the Cold War, peace support operations (PSO) have become the mainstay and principal occupation of most Western armies. At the same time, Italy has been one of the most important actors in such an area. The article focuses on the cooperation between military and civil components (a process called CIMIC) as a key variable in the Italian PSOs. We will analyse in detail the main lessons learned from past military interventions as well as the general context in which new tendencies are taking place. The maintaining of a minimum security frame becomes essential to fulfil activities ‘collateral’ to the mission: reconstructing services and infrastructure, food distribution, water and medication, law and order, de-mining, training of local forces, and supporting local institutions. These are the main tasks to obtain thrust and support from the population. 相似文献
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This article demonstrates the inconsistent and wavering Soviet attitude towards national liberation movements in general and the Palestinian organizations in particular. Until the late 1960s, the Soviets viewed these organizations with suspicion, hesitating to engage in political dialogue with them. However, in the 1970s, political and military events in the region, as well as modifications in the Kremlin's Cold War strategies, led to a general shift towards the Middle East in Soviet foreign policy. Soviet leaders showed increased willingness to provide certain Palestinian organizations with arms with which to conduct terrorist activities against Israeli, pro-Israeli, Jewish and Western targets. The article explores the complex relations between Palestinian organizations and the USSR in the field of international terror. The study also exposes and analyzes the nature and content of Soviet–Palestinian arms dialogues and transactions. It provides clear evidence that Soviet policymakers and other luminaries were fully informed of, and sometimes directly involved in, these transactions and dialogues at the highest levels. 相似文献
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Paul Rich 《Small Wars & Insurgencies》2013,24(1):39-56
The September 11 global crisis prompted by the attacks on the World Trade Center and the Pentagon raises major questions concerning the nature and trajectory of terrorism in the post-Cold War global order. Hitherto, terrorism has been largely debated by analysts at the level of nation states. Terrorist and insurgent movements have also been largely anchored in nationalist and ethnic power bases even when they have sought to mobilise a transnational ideological appeal on religious or class grounds. There have been a few exceptions to this pattern such as the alliance between the German Baader-Meinhof group and the Japanese Red Army Faction, but even such international alliances as this did not, until at least the 1980s, presage anything like a global terrorist network necessitating a global strategic response. This study examines terrorism and global strategic responses. 相似文献
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Jelmer Brouwer 《Small Wars & Insurgencies》2013,24(5):835-856
This article analyses to what extent the Burmese KNU insurgency made use of external support from states, refugees, and diasporas. Based on extensive fieldwork it is concluded that support from neighbouring states and refugees has for years kept the Karen rebellion alive. Western countries perceived forms of resistance to the illegitimate Burmese regime as just and have therefore played a crucial role in the continuation of conflict in Karen State. It is important that policymakers and donors as well as executing organizations continue to reflect critically on the way they exercise their work. 相似文献
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Aleksander Zdravkovski 《Small Wars & Insurgencies》2013,24(5-6):941-963
ABSTRACTWhat was the scope of the Bosnian jihadi participation in the war in Syria? Did the Bosnian volunteers tend to join one particular faction? Why did the Bosnian youngsters decide to join the holy war in the Levant? Was this an organized and hierarchical process or was this a grassroots movement? Last, were all the Salafis in Bosnia supportive of this dynamic or did this process cause internal frictions? These are some of the questions that this research will try to answer. 相似文献
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Christopher Davis 《Defence and Peace Economics》2013,24(3):145-177
The Soviet Union was able to develop a large military-industrial complex and become the world's second superpower despite deficiencies in its centrally planned economy because defence was given high priority status and special planning, rationing and administrative mechanisms were used to attain national security objectives. However, in the period 1976-85 the effectiveness of priority protection diminished and defence institutions experienced more of the problems typical of the shortage economic system. The heavy defence burden also created growing difficulties for the civilian economy. The attempts by the Gorbachev government to reform the defence sector and improve defence-economic relationships during perestroika (1985-91) uniformly failed. For most of the transition period, the Russian military-industrial complex has been adversely affected by its low priority status, cuts in defence spending, instability of the hybrid politico-economic system, and negative growth of the economy. The armed forces and defence industry have been reduced in size and their outputs of military services and equipment have fallen to low levels. Nevertheless, the Russian armed forces still have over one million troops, significant stocks of sophisticated conventional weapons, and a large nuclear arsenal. The government of President Putin has raised the priority of the defence sector, increased real defence spending, and adopted ambitious plans to revive Russian military power. It is likely, though, that tight resource constraints will hamper efforts to reform the armed forces and to upgrade weapons. By 2010 Russia will be an important, but not dominant, military power in Eurasia. 相似文献
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Bettina Renz 《Small Wars & Insurgencies》2013,24(1):55-77
The collapse of the Soviet Union precipitated the massive expansion of drug use and trade in Russia. The country now has one of the largest populations of injecting drug users in the world and has become the largest single-country market for Afghan heroin. In 2003 the Federal Service for the Control of the Drugs Trade was created to coordinate a comprehensive counternarcotics strategy appropriate to the scale of this threat. The service continues to face a number of challenges in its early stages of development. However, it has made considerable advances in improving responses to large-scale organised crime and in building international cooperation. 相似文献