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Performance Space-Based ADC Development 基于空间的高性能ADC开发
Q3 Engineering Pub Date : 2025-01-01 Epub Date: 2025-03-27 DOI: 10.1016/j.ifacol.2025.03.071
Benedikt Ohse , Jürgen Kampe , Christopher Schneider
Performance spaces represent the full range of attainable performances of an integrated analog circuit, including gain and bandwidth. Based on the knowledge of the optimal and least favorable values, simplified simulation models can be employed to optimize the system design process. We present a modified variant of the well-established Normal-Boundary Intersection method, which is used to approximate five-dimensional performance spaces in reasonable time. Based on these approximations, we develop a concept for implementing a system-level simulation that is used to design an operational transconductance amplifier for an analog-to-digital converter to improve its sampling rate. To demonstrate the usability of our concept, we perform several numerical experiments and visualize the data in parallel coordinates plots for better user comprehension.
性能空间表示集成模拟电路的全部可实现性能,包括增益和带宽。基于最优和最不利值的知识,可以采用简化的仿真模型来优化系统设计过程。我们提出了一种完善的法向边界相交方法的改进变体,该方法用于在合理的时间内近似五维性能空间。基于这些近似,我们开发了一个实现系统级仿真的概念,用于设计用于模数转换器的可操作跨导放大器,以提高其采样率。为了证明我们的概念的可用性,我们进行了几个数值实验,并在并行坐标图中可视化数据,以便更好地用户理解。
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引用次数: 0
Sensitivity Analysis of a Mathematical Model Representing the Female Endocrine Cycle 女性内分泌周期数学模型的敏感性分析
Q3 Engineering Pub Date : 2025-01-01 Epub Date: 2025-03-27 DOI: 10.1016/j.ifacol.2025.03.044
Clara Horvath , Marie-Sophie Kohlmayer , Andreas Körner
This paper presents an extensive global sensitivity analysis of a mathematical model describing the female endocrine cycle. The model, based on a system of differential equations, captures the dynamics of Luteinizing Hormone, Follicle-Stimulating Hormone, Estrogen, and Progesterone, along with their regulatory feedback mechanisms. We employed three complementary methods – Latin Hypercube Sampling, Partial Rank Correlation Coefficient, and extended Fourier Amplitude Sensitivity Test – to analyze both linear and non-linear parameter-output relationships. The extended Fourier Amplitude Sensitivity Test method, in particular, revealed non-monotonic and non-linear interactions between input and output, highlighting the complexity of the hypothalamus-pituitary-ovary axis. Our findings offer significant insights for future model refinement and pave mathematical ways towards better understanding of the female endocrine cycle and potential clinical applications, especially in the diagnosis and treatment of reproductive disorders.
本文提出了一个广泛的全局敏感性分析的数学模型描述女性内分泌周期。该模型基于一个微分方程系统,捕捉了促黄体生成素、促卵泡激素、雌激素和孕激素的动态,以及它们的调节反馈机制。我们采用了三种互补的方法——拉丁超立方采样、偏秩相关系数和扩展傅立叶振幅灵敏度测试——来分析线性和非线性参数-输出关系。特别是扩展傅立叶振幅灵敏度测试方法,揭示了输入和输出之间的非单调和非线性相互作用,突出了下丘脑-垂体-卵巢轴的复杂性。我们的研究结果为未来的模型改进提供了重要的见解,并为更好地理解女性内分泌周期和潜在的临床应用铺平了数学途径,特别是在生殖疾病的诊断和治疗方面。
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引用次数: 0
Limit Cycle Analysis of Guideline-based treated Graves’ Disease Patients 基于指南治疗的Graves病患者的极限环分析
Q3 Engineering Pub Date : 2025-01-01 Epub Date: 2025-03-27 DOI: 10.1016/j.ifacol.2025.03.043
Thomas Benninger , Martin Horn , Markus Reichhartinger
A brief review of existing medical dosage guidelines for Graves’ disease is conducted. This motivates to derive a recommendation strategy and a performance assessment via limit cycle stability analysis. For this purpose, an existing mathematical treatment model is simplified by incorporating medical aspects. From an application point of view, this is related to suboptimal treatments which can be approximated by a proportional controller in combination with a time-discretization of the closed-loop model for incorporating the effect of regular appointments with a physician. The presented results highlight critical aspects to be considered during treatment.
简要回顾现有的格雷夫斯病用药剂量指南。这促使我们通过极限环稳定性分析推导出推荐策略和性能评估。为此,将现有的数学治疗模型简化,纳入医学方面。从应用的角度来看,这与次优治疗有关,次优治疗可以通过比例控制器与闭环模型的时间离散化相结合来近似,以纳入与医生定期预约的影响。提出的结果强调了治疗过程中需要考虑的关键方面。
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引用次数: 0
Nonlinear Coupled PDE-ODE Model of a Distributed Ćuk Converter 分布式Ćuk转换器的非线性耦合PDE-ODE模型
Q3 Engineering Pub Date : 2025-01-01 Epub Date: 2025-03-27 DOI: 10.1016/j.ifacol.2025.03.017
Klaus Röbenack , Daniel Gerbet
The Ćuk converter is a particularly interesting converter, as it can be used to generate voltages which could be above or below the supply voltage. The chokes take up the most space when setting up such a converter. In this article, the chokes are replaced by transmission lines. This approach leads to a new converter topology and other mathematical models. The new distributed converter model can later on be discretized for a physical implementation to replace the two large inductances with numerous smaller inductances as suggested by Sander (2012).
Ćuk 转换器是一种特别有趣的转换器,因为它可以用来产生高于或低于电源电压的电压。在安装这种转换器时,扼流圈占用的空间最大。在本文中,扼流圈被传输线取代。这种方法带来了一种新的变流器拓扑结构和其他数学模型。新的分布式转换器模型可在以后的物理实施中进行离散化,以 Sander(2012 年)提出的众多较小电感取代两个大电感。
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引用次数: 0
Neural Operator based Reinforcement Learning for Control of first-order PDEs with Spatially-Varying State Delay⁎ 基于神经算子的一阶状态时滞微分方程的强化学习控制[j]
Q3 Engineering Pub Date : 2025-01-01 Epub Date: 2025-08-29 DOI: 10.1016/j.ifacol.2025.08.085
Jiaqi Hu , Jie Qi , Jing Zhang
Control of distributed parameter systems affected by delays is a challenging task, particularly when the delays depend on spatial variables. The idea of integrating analytical control theory with learning-based control within a unified control scheme is becoming increasingly promising and advantageous. In this paper, we design a integrated control strategy combining PDE backstepping and deep reinforcement learning (RL) for an unstable first-order hyperbolic PDE with spatially-varying delays. This method eliminates extra constraint on the delay function required for the backstepping design. We embed a DeepONet, trained to learn the backstepping controller, into a soft actor-critic (SAC) framework as a feature extractor for both the actor and critic networks. Simulation results demonstrate that the proposed algorithm outperforms standard SAC in reducing steady-state error and surpasses the backstepping controller in mitigating overshoot.
受延迟影响的分布参数系统的控制是一项具有挑战性的任务,特别是当延迟依赖于空间变量时。将分析控制理论与基于学习的控制结合在一个统一的控制方案中的想法正变得越来越有前途和优势。针对一类具有空间变化时滞的不稳定一阶双曲PDE,设计了一种结合PDE反演和深度强化学习(RL)的集成控制策略。该方法消除了反推设计对延迟函数的额外约束。我们将一个DeepONet嵌入到一个软演员-评论家(SAC)框架中,作为演员和评论家网络的特征提取器。仿真结果表明,该算法在减小稳态误差方面优于标准SAC,在减小超调方面优于后退控制器。
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引用次数: 0
Polynomial Stability of an Elastic Plate with Dynamical Boundary Control 具有动态边界控制的弹性板的多项式稳定性
Q3 Engineering Pub Date : 2025-01-01 Epub Date: 2025-08-29 DOI: 10.1016/j.ifacol.2025.08.096
Yanan Sun , Qiong Zhang
This work studies the boundary feedback stabilization for an elastic thin plate, where one part of its boundary is clamped and the remaining free part is attached to a rigid body. The boundary feedback controls are applied to the free boundary. Given that the boundary of the domain may have corners, we introduce a proper abstract framework to analyze the well-posedness and estimate the resolvent. When the geometric control condition (GCC) holds, we prove a polynomial energy decay rate of t-1/2. For cases where GCC does not hold, we analyze the system on a rectangular domain with control applied to only one edge and obtain a slower decay rate t-1/3.
本文研究了弹性薄板的边界反馈稳定化问题,其中薄板的一部分边界被夹紧,剩余的自由部分附着在刚体上。边界反馈控制应用于自由边界。考虑到域的边界可能存在角点,我们引入了一个适当的抽象框架来分析域的适定性和估计解。当几何控制条件(GCC)成立时,我们证明了多项式能量衰减率为t-1/2。对于GCC不成立的情况,我们在矩形域上分析系统,只对一条边施加控制,并获得较慢的衰减率t-1/3。
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引用次数: 0
State estimation for stochastic parabolic systems: A two-step estimation method⁎ 随机抛物型系统的状态估计:一种两步估计方法
Q3 Engineering Pub Date : 2025-01-01 Epub Date: 2025-08-29 DOI: 10.1016/j.ifacol.2025.08.066
Yu Gao , Kai-Ning Wu
This paper proposes a novel two-step interval estimation-based state estimation scheme for a class of stochastic parabolic systems. Peak-to-peak analysis is introduced to solve the difficulties generated by the spatiotemporal characteristic and the multidimensional nature. Based on the two-step interval estimation method, the adaptive thresholds of the mathematical expectation of the system state are obtained. Numerical simulation is adopted to show the effectiveness of the proposed method.
针对一类随机抛物型系统,提出了一种新的基于两步区间估计的状态估计方法。引入峰对峰分析,解决了由于时空特征和多维性所带来的困难。基于两步区间估计方法,得到了系统状态数学期望的自适应阈值。通过数值仿真验证了该方法的有效性。
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引用次数: 0
A Multi-physics Model for Phase Change Actuation in Soft Robotics: Towards Untethered Soft Robots 软机器人相变驱动的多物理场模型:面向无系绳软机器人
Q3 Engineering Pub Date : 2025-01-01 Epub Date: 2025-11-05 DOI: 10.1016/j.ifacol.2025.10.133
Alexia Le Gall , Mattia Franchi de’ Cavalieri , Matteo Cianchetti
This paper presents a multi-physics model for phase-change-driven actuation in soft robotics, focusing on untethered systems that autonomously generate pressure through liquid evaporation. The model integrates electrothermal, thermo-fluidic, and mechanical domains, coupling Peltier-based heating, vapor generation, and soft material deformation. By operating in a pre-boiling regime, the approach minimises thermal gradients, enhances responsiveness, and reduces energy consumption. The governing equations are integrated into a multiphysics model, providing an innovative tool for designing efficient, safe, and controllable actuators with applications in robotics, biomedical devices, and adaptive materials.
本文提出了软机器人中相变驱动驱动的多物理场模型,重点研究了通过液体蒸发自主产生压力的非系绳系统。该模型集成了电热、热流体和机械领域,耦合了基于珀耳梯的加热、蒸汽产生和软材料变形。通过在预沸腾状态下操作,该方法最大限度地减少了热梯度,提高了响应性,并降低了能耗。控制方程集成到多物理场模型中,为设计高效,安全和可控的致动器提供了创新工具,可用于机器人,生物医学设备和自适应材料。
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引用次数: 0
Prototyping Tool using an Embedded Digital Twin for Assistive Technology Reconfiguration 使用嵌入式数字孪生进行辅助技术重构的原型工具
Q3 Engineering Pub Date : 2025-01-01 Epub Date: 2025-11-05 DOI: 10.1016/j.ifacol.2025.10.144
Aurélian Houé , Florent Frizon de Lamotte , Cédric Seguin , Nathalie Julien , Willy Allègre
To achieve autonomy in their daily lives, people with a disability need assistive devices. Still, according to Denormandie and Chevalier (2020), 30 to 40% of these are discarded in the first year of use. One reason is the lack of adaptation; indeed, current models of handicap demonstrate how much a disability situation can evolve according to both environmental and personal factors together with time. To overcome this situation and develop more accessible assistive technologies, we propose to integrate reconfiguration capabilities in a 3 steps usage adaptation framework. Customisation involves the user in the design process and enhances the appropriation of assistive aids, configuration allows the adaption of mechanical, hardware or software capabilities of the assistive technology to the individual’s current abilities, and reconfiguration updates those capabilities following the changes in the person’s disability situation. This paper presents a complete approach, from the formalism to the first implementation, to develop a versatile framework. Configuration is achieved using a distributed electronic structure, based on two types of nodes, controller and operative nodes. The control node uses a dedicated communication protocol to exchange messages with operative nodes. The operative nodes manage various sensors and actuators that behave according to the software configuration. This electronic toolkit used with 3D design tools allows the co-design and customisation of mechatronic prototypes of the AT. Reconfiguration is orchestrated by an Embedded Digital Twin (EDT), integrated into the main controller, which detects situations in which the configuration needs to be updated. Helped by the distributed hardware, it dynamically reconfigures each node to match the targeted configuration.
为了在日常生活中实现自主,残疾人需要辅助设备。尽管如此,根据Denormandie和Chevalier(2020)的数据,其中30%至40%在使用的第一年就被丢弃了。原因之一是缺乏适应能力;事实上,目前的残疾模型表明,残疾情况可以根据环境和个人因素以及时间的变化而变化。为了克服这种情况并开发更易于访问的辅助技术,我们建议在一个3步使用适应框架中集成重新配置功能。定制让用户参与设计过程,增强辅助设备的适用性;配置允许对辅助技术的机械、硬件或软件功能进行调整,以适应个人当前的能力;重新配置可以根据个人残疾情况的变化更新这些功能。本文提出了一个完整的方法,从形式化到第一个实现,以开发一个通用的框架。配置是使用分布式电子结构实现的,基于两种类型的节点,控制器和操作节点。控制节点使用专用的通信协议与操作节点交换消息。操作节点根据软件配置管理各种传感器和执行器。这个与3D设计工具一起使用的电子工具包允许AT的机电一体化原型的共同设计和定制。重新配置由嵌入式数字孪生体(EDT)编排,集成到主控制器中,可以检测需要更新配置的情况。在分布式硬件的帮助下,它动态地重新配置每个节点以匹配目标配置。
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引用次数: 0
Experimental comparison of energy efficiency of peristaltic mixing pump and propeller-type mixer in mixing under different viscosity conditions 不同粘度条件下蠕动混合泵与螺旋桨式混合器混合能量效率的实验比较
Q3 Engineering Pub Date : 2025-01-01 Epub Date: 2025-11-05 DOI: 10.1016/j.ifacol.2025.10.161
Kentaro Kikyodani , Yuki Enomoto , Masataka Uchino , Kaho Nomura , Rie Nishiama , Taro Nakamura
The mixing process plays an important role in the food and chemical industries, and its efficiency has a significant impact on production costs and product quality. A peristaltic mixing pump that mimics an intestinal tube has been developed in the field of soft robotics as a new mixing method for highly viscous fluids and solid-liquid mixtures. The objective of this study was to quantitatively evaluate the energy efficiency of a peristaltic mixing pump in mixing viscous materials compared to a commonly used propeller-type mixer in mixing. Specifically, the work rates of the two systems were standardized for three base materials of different viscosities (2, 2.5, and 3 Pa-s), and the energies required to complete mixing were compared. As a result, it was confirmed that the energy efficiency of the peristaltic mixing pump exceeded that of the propeller-type mixer for the more viscous base material. The peristaltic mixing pump was found to be less susceptible to viscosity changes and more stable in terms of mixing completion time. This difference may be due to the fact that peristaltic mixing pumps primarily use squeeze flow for mixing and are more effective for highly viscous materials.
混合过程在食品和化工行业中占有重要的地位,其效率对生产成本和产品质量有着重要的影响。在软机器人领域,研制了一种模拟肠管的蠕动混合泵,作为高粘性流体和固液混合物的混合新方法。本研究的目的是定量评价蠕动混合泵在混合粘性材料时的能量效率,并与常用的螺旋桨式混合器进行比较。具体来说,对三种不同粘度的基材(2、2.5和3 Pa-s)的两种体系的功速率进行了标准化,并比较了完成混合所需的能量。结果表明,对于粘性较大的基料,蠕动混合泵的能量效率优于螺旋桨混合器。蠕动混合泵对粘度变化的影响较小,在混合完成时间方面更稳定。这种差异可能是由于蠕动混合泵主要使用挤压流进行混合,并且对高粘性材料更有效。
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引用次数: 0
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