基于电磁直线作动器的主动悬架控制方法研究

为了实现电磁直线作动器主动悬架中电磁阻力的有效跟踪输出,进一步提高悬架的性能,利用1/4主动悬架系统的动力学模型和作动器驱动电路模型,设计了LQG控制器和Fuzzy-PID控制器相结合的主动悬架分层控制系统。给出了电磁直线作动器主动悬架控制系统的设计方案,利用MATLAB/Simulink搭建模型进行仿真,并通过具体的台架试验验证。结果表明,主动悬架的减振性能得到了明显改善,其车身加速度和悬架动行程得到了大幅降低。研究结果对电磁悬架的主动控制方法研究具有一定的参考价值。     

The Relationship between Interest Rates and Inflation: Examining the Fisher Effect in China

This study revisits the Fisher effect using a different empirical method that considers a potential nonlinear relationship between interest rates (treasury bond rates) and inflation in China. The rising uncertainty and asymmetric information in financial markets between bond holders and bond issuers suggest such a potential nonlinear relationship. To this aim, we apply Shin et al.’s (2014) nonlinear autoregressive distributed lag (NARDL) model with asymmetric dynamic multipliers for the sample period 2002M7–2018M4. The empirical findings reveal symmetric and asymmetric partial Fisher effects for all sample bond rates in China. Furthermore, we find that 20-year bond rates experience the lowest partial Fisher effect.     

Rank tests for price convergence in Australian beverage markets

This article examines the price convergence of beverage products within Australia in order to assess the efficacy of intranational cross-border movements of products under the Australia’s Mutual Recognition Agreement. Since the cointegrating relationship between product prices may not be exact or linear, we adopt the rank tests for analysis which do not require prior knowledge and specification of the linear or nonlinear functional form. Our results validate the price convergence of all beverage products within Australia, with the exception of a few regions in the milk market. Furthermore, a subset of the cointegration relationships exhibits nonlinear long-run price co-movements.     

The Russian option: Finite horizon

We show that the optimal stopping boundary for the Russian option with finite horizon can be characterized as the unique solution of a nonlinear integral equation arising from the early exercise premium representation (an explicit formula for the arbitrage-free price in terms of the optimal stopping boundary having a clear economic interpretation). The results obtained stand in a complete parallel with the best known results on the American put option with finite horizon. The key argument in the proof relies upon a local time-space formula.Received: March 2004, Mathematics Subject Classification (2000): 91B28, 35R35, 45G10, 60G40, 60J60JEL Classification: G13Goran Peskir: Centre for Analytical Finance (funded by the Danish Social Science Research Council) and Network in Mathematical Physics and Stochastics (funded by the Danish National Research Foundation).The first draft of the present paper has been completed in September 2002. I am indebted to Albert Shiryaev for useful comments.     

振动攻丝机及其试验研究

本文对振动攻丝机的机械结构进行了探讨;对振动攻丝新工艺进行了试验研究。     

Asymmetric Cointegration,Nonlinear ARDL,and the J-Curve: A Bilateral Analysis of China and Its 21 Trading Partners

This article follows the nonlinear Autoregressive Distributed Lag (ARDL) error-correction methodology to explore nonlinearity in the relationship between the trade balances and the real exchange rates for China and its 21 partners. We find evidence for short-run asymmetric effects of exchange rate in cases of 18 partners, short-run adjustment asymmetry in cases of 11 partners, short-run cumulative asymmetry in cases of seven partners, and a significant long-run asymmetric effect cases of five partners. We find support for the “J-curve” that is only due to appreciation or depreciation of the Yuan in cases of five partners, including the U.S.     

基于BP神经网络的服装出口预测

服装出口贸易受到国内国际诸多因素的影响,是一个复杂的非线性系统。BP神经网络能够以任意精度逼近任何一个具有有限间断点的非线性函数,特别适合于解决非线性系统的预测决策问题。采用三层BP神经网络对我国服装出口进行预测,结果表明该方法能有效的对服装出口进行预测。     

基于有限元法的船舶管道振动分析

文中针对舰船管道的振动特点,利用有限元分析的方法,对船舶管道系统进行减振分析,发现具有干摩擦减振器的管道系统比常规的弹簧减振无论是在衰减时间上还是在振动幅值上都有着良好的减振效果。因而具有明显的优越性和广阔的应用前景。     

斜拉桥索力监测技术现状研究

文章对斜拉桥索力监测技术进行研究,分析了目前常见的索力量测方法及其特点,指出了其适用范围及存在不足,对仍需研究探讨的内容提出了自己的见解。     

Nonlinear Pricing and the Market for Settling Payments

Fedwire Funds is a real‐time gross settlement system that uses a decreasing block pricing scheme to attract nonurgent payments. A bank's optimal response to Fedwire's pricing depends on its perceived benefits to settling nonurgent payments quickly. If the urgency for immediate settlement is great enough, a bank responds to marginal price; otherwise, it responds to average price. We find banks respond to average price, suggesting that Fedwire's advantage over competing services of being able to provide immediate settlement is small. Moreover, attempts to increase demand for Fedwire services by lowering the cost of banks' final block of payments may be ineffective if there is not a corresponding decrease in average cost.