共查询到20条相似文献,搜索用时 250 毫秒
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控制目标多样化是提高有源电力滤波器应用效能的重要措施,而如何快速、精确检测出有源电力滤波器控制所需的各种指令信号是保证有源电力滤波器高性能工作的基础。本文提出了一种基于广义正交变换的指令信号检测新方法,详细阐述了广义正交变换的基本理论及检测各种指令信号的实现原理,最后给出了仿真结果。理论分析和仿真结果证明了该方法的有效性,为开发多目标控制的有源电力滤波器提供很有效的信号检测新方法。 相似文献
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本系统以STC89C52单片机为控制核心,通过AD9850输入频率调节字来实现输出频率控制,对AD9850模块输出信号进行滤波放大,实现扫频信号输出。采用矩阵键盘扫描,液晶1602显示操作方便简单,具有十分友好的人机界面,根据输入的起始频率,终止频率和步进频率,实现手动或自动线性扫频。还可用作高精度点频信号源,输出方波和正弦波。 相似文献
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为解决在恶劣天气(雨、雪、雾、霾)及杨柳絮多发时段下M701F4燃气轮机进气罩壳滤网易堵塞,进而导致燃机出力受限或触发机组RB及跳闸问题。以京燃热电厂为例,基于机电一体控制技术及多传感器检测技术,设计研发M701F4燃气轮机进气罩壳滤网冲洗机器人系统。该冲洗机器人系统通过DCS系统可控制轨道机器人实现水、气组合清洗,解决了滤网杂质堵塞问题,延长了粗滤滤芯使用寿命,降低了人工成本,同时通过喷雾冷却,一定程度降低压气机入口进气温度,提高燃机出力。 相似文献
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Univariate filters used in output gap estimation are subject to criticism as being purely statistical and having no economic content. The information content of the output gap measures estimated by standard multivariate filtering techniques, on the other hand, can be distorted because of the possibly unrealistic restriction that system parameters stay constant over time. In this study, we seek to address these shortcomings by proposing an output gap estimation method that takes into account changing economic relations. We employ a nonlinear time series framework along with the extended Kalman filter, in which economic content is used by inflation and output gap dynamics and the parameters are allowed to be time varying. We use the Turkish economy as a laboratory to show that our method provides useful results, both in terms of the properties of output gap estimates and for the assessment of change in macroeconomic dynamics. 相似文献
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选取2011—2020年制造业上市公司数据,以信号理论为视角研究政府补助、金融化与制造业创新之间的关系。研究发现:研发补助、非研发补助对创新产出的作用具有非对称性,金融化在信号传递的过程中发挥了调节效应;研发补助和创新产出存在倒“U”型关系,非研发补助和创新产出呈正相关;金融化可以正向调节研发补助、非研发补助和创新产出的关系,与其他制造企业相比,金融化的调节作用在民营制造企业表现得最为明显。 相似文献
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光纤管道安全光纤预警系统是基于瑞利相干分布式光纤振动传感系统(DVS),以与管道同沟敷设的通信光缆作为传感器,全天候实时监测管道周围土壤震动,可以实时监测土壤的振动数据,一旦发生危害管道安全的破坏事件,系统能第一时间感知.在中俄天然气管道东线,系统长期运行在低温环境下,灵敏度降低,亟须新的数据处理方法提高系统灵敏度.以信噪比作为灵敏度衡量标准,分析当前普遍使用的差分算法的优势和劣势.建立数学模型,得到差分算法提高信号信噪比的条件.通过MATLAB仿真,得到信号频率分布范围与最佳差分方式对应表格.提出一种新的灵敏度提升算法流程,对不同频率分布的信号均起到最佳的灵敏度提升效果,克服了原差分方式的劣势.现场试验表明,采用新算法后信噪比有明显提高. 相似文献
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吴敬东 《中国资源综合利用》2010,28(7):60-62
针对江苏省污水处理厂提标改造中深度处理部分的选择,讨论了纤维束过滤技术的特点、工艺组合及应用等,得出该过滤技术和常规过滤相比,纤维束过滤具有占地面积小、处理效果好、使用寿命长等优点。 相似文献
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This paper revisits the empirical existence of the Phillips curve in the Indian context. To estimate the Phillips curve we need two variables: inflation and the output gap. In the case of India, incorrect measurement of both variables causes much difficulty in estimating the Phillips curve. We use a non-linear Kalman filter approach to estimate the output gap and find that the Kalman filter estimate captures all the dynamics of the economy. Our results show that after taking supply shocks into consideration, there is clear evidence as to the existence of the Phillips curve in India for recent years. 相似文献
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p. burger m. marinkov 《The South African journal of economics. Suid-afrikaanse tydskrif vir ekonomie》2006,74(2):172-189
Is there a Phillips curve relationship present in South Africa and if so, what form does it take? Traditionally the method to establish whether or not there is a relationship between the output gap and the change in inflation is merely to regress the latter on the former. This yields the well‐known augmented Phillips curve. However, Gordon has argued that this specification of the Phillips curve produces biased results. Instead, he puts forward and estimates successfully for several industrialised countries his so‐called triangular model that tests for hysteresis and inertia in the behaviour of inflation, as well as the impact on inflation of changes in the output level. This paper considers whether or not Gordon's triangle model is applicable to South Africa, i.e. are hysteresis and inertia present in South Africa? In addition, in an attempt to find a better estimation of the output gap, the paper also experiments with alternative ways to estimate the long‐run output level, including the standard HP‐filter, as well as a production function approach. 相似文献
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Giuseppe Schlitzer 《Open Economies Review》1995,6(4):387-397
Using new series of aggregate and disaggregate output, this paper examines the historical pattern of volatility of economic fluctuations in Italy. Results evidence a higher stability in the postwar era, with respect to both the prewar and the interwar periods. Evidence is provided that the higher degree of stabilization of the Italian business cycle cannot be entirely attributed to the shift in the composition of aggregate output from more to less cyclical sectors. It is shown, however, that although the sign of the change in volatility is invariant to the filter adopted for the decomposition into trend and cycle, this is not true for both its size and statistical significance. 相似文献
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In this paper we estimate the indicator output gap for the Russian economy in 2000–2015 using univariate and multivariate versions of the Hodrick–Prescott filter and the Kalman filter for the model of unobserved components (taking into account the Phillips curve). The calculation results show a slowdown of potential output after 2014. 相似文献