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基于振动压实模量的路基压实质量变异性控制优化研究
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作者 聂裕林 《交通工程》 2024年第11期91-96,共6页
受波传播速度、信号混叠、局部应力分布、仪器限制等因素影响,当前智能压实测量值在下层强度相对较高时无法准确测量填充层的状态。为了解决该不足,本研究在填挖路基中进行实验性现场试验,评估智能压实测量值的变化特性。基于理论分析... 受波传播速度、信号混叠、局部应力分布、仪器限制等因素影响,当前智能压实测量值在下层强度相对较高时无法准确测量填充层的状态。为了解决该不足,本研究在填挖路基中进行实验性现场试验,评估智能压实测量值的变化特性。基于理论分析和数值模拟方法,提出1种新的智能压实测量值--振动压实模量,该模量能消除下层的干扰,揭示填充层的实际压实状态。并进一步提取该模量以研究填充层压实状态的变异性。研究结果表明,下层刚度对整体压实质量的影响显著,基于振动压实模量评估智能压实测量值更有可能实现填充层压实状态的变异控制。所呈现的测量数据、改进方法和相关结论为考虑使用智能压制技术的研究人员和从业人员提供宝贵的信息。 展开更多
关键词 智能压实 路基数字化施工 挖填路基 数值模拟 可变性控制
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Controllability, Observability and Stability for a Class of Fractional-Order Linear Time-Invariant Control Systems
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作者 曾庆山 曹广益 朱新坚 《Journal of Shanghai Jiaotong university(Science)》 EI 2004年第2期20-24,共5页
The definitions of controllability, observability and stability were presented for fractional-order linear systems. Using the Cayley-Hamilton theorem and Mittag-Leffler function in two parameters, the sufficient and n... The definitions of controllability, observability and stability were presented for fractional-order linear systems. Using the Cayley-Hamilton theorem and Mittag-Leffler function in two parameters, the sufficient and necessary conditions of controllability and observability for such systems were derived. In terms of Lyapunov’s stability theory, using the theorems of Mittage-Leffler function in two parameters this paper directly derived the sufficient and necessary condition of stability for such systems. The results obtained are useful for the analysis and synthesis of fractional-order linear control systems. 展开更多
关键词 fractional calculus fractional-order linear time-invariant systems CONTROLLABILITY OBSERVABILITY STABILITY
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ON CONTROLLABILITY FOR STOCHASTIC CONTROL SYSTEMS WHEN THE COEFFICIENT IS TIME-VARIANT 被引量:2
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作者 Feng LIU Shige PENG 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2010年第2期270-278,共9页
This paper investigates the controllability problem of time-variant linear stochastic controlsystems.A sufficient and necessary condition is established for stochastic exact controllability,whichprovides a useful alge... This paper investigates the controllability problem of time-variant linear stochastic controlsystems.A sufficient and necessary condition is established for stochastic exact controllability,whichprovides a useful algebraic criterion for stochastic control systems.Furthermore,when the stochasticsystems degenerate to deterministic systems,the algebraic criterion becomes the counterpart for thecomplete controllability of deterministic control systems. 展开更多
关键词 Backward stochastic differential equation (BSDE) E-well-posedness Stochastic controlsystem stochastic exact controllability.
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