Flexible joint parameters identification method based on improved tracking differentiator and adaptive differential evolution

Song, Chuanming; Du, Qinjun; Yang, Shuxin; Feng, Han; Pang, Haijun; Li, Cunhe

doi:10.1063/5.0099485

Cited by 3 publications

(3 citation statements)

References 23 publications

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Section: Introductionmentioning

confidence: 99%

“…Expanding the integral term of an input signal in TD formulation, an augmented NTD is designed for smooth differential property. 23 Most recently, a hybrid TD is constructed by an improved sigmoid function in Song et al 24 A fast exponential integral NTD (EITD) is proposed for small error estimation. 25 The desire for fast and high-precision velocity signal for motion systems motivates us to revisit the problem of velocity estimation from noisy position measurement only.…”

Section: Introductionmentioning

confidence: 99%

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A fast transient tracking differentiator for high-precision motion systems

Wang

2023

Proceedings of the Institution of Mechanical Engineers, Part I:

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High-quality velocity signal plays an important role in fast and precise motion systems, but most commercially available motion systems are not commonly equipped with velocity sensors; hence, full access to the system states is impossible. A fast transient tracking differentiator is proposed in this article for obtaining the noise-less time derivative from a noisy measurement. The fast transient tracking differentiator is conceived within the framework of tracking differentiator methodology and is accomplished by integrating a power-like function with a smooth hyperbolic sine function. Tracking differentiator theory and Lyapunov direct method are employed to show the global asymptotic convergence. Advantages of the proposed fast transient tracking differentiator include the easy implementation with intuitive structure and high computational efficiency and faster transient and higher noise attenuation for both small and large initial estimation errors. The proposed fast transient tracking differentiator can be applied to a large class of motion systems by cascading to a robust output feedback proportional–derivative control for fast and high-precision positioning with position measurement only. Numerical simulation and real-time experimental comparisons demonstrate that the proposed approach provides an easygoing model-free output feedback solution for fast and accurate velocity reconstruction and high-performance positioning of uncertain motion systems with position measurement only.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A fast transient tracking differentiator for high-precision motion systems

Wang

2023

Proceedings of the Institution of Mechanical Engineers, Part I:

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“…Song et al proposed a parameter identification method for flexible joints combined with offline identification and online compensation. They found that feedforward compensation control can effectively correct model parameters and improve control accuracy [11]. Xu et al established the special casing of the nipple analysis model using the MARC contact module and simulated the stress of the special thread casing distribution rule and the mechanical properties of the threaded nipple [12].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Modeling and Parameter Identification of Double Casing Joints for Aircraft Fuel Pipelines

Quan,

Fu,

Yao

et al. 2023

Processes

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Double casing joints are flexible pipe joints used for connecting aircraft fuel pipelines, which can compensate for the displacement and corner of the connected pipes and have complex mechanical characteristics. However, it is difficult to use sensors to directly measure the mechanical connection parameters of flexible joints. In this paper, we construct a coupling dynamics model and parameter identification of a double casing joint. Firstly, we analyze the structure and working principle of double-layer casing joints and establish the dynamics model of a single-layer flexible joint based on the transfer matrix method. Then, we deduce the coupling matrix of the inner and outer pipeline according to the deformation coordination conditions combined with matrix dimension extension. We establish the coupling dynamics model of flow–solid coupling of double casing joints. Furthermore, parameters such as equivalent stiffness and damping of each motion of the double casing joint in the casing unit are identified using the force-state mapping (FSM) method, and an analytical solution in the frequency domain under hammering excitation is given by the dynamics model. Finally, the dynamics test bench of the double casing joint for aircraft fuel is set up, and the free mode test of the double casing joint assembly is carried out. The results show that under free boundary hammering excitation, the theoretical and experimental frequency-domain response results are well matched, both obtaining seven main resonance peaks, and the maximum error is 9.45%, which shows the validity of the pipeline dynamics modeling method with a double casing joint.

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Structural Optimization Design of Microfluidic Chips Based on Fast Sequence Pair Algorithm

Wu,

Sun,

Almuaalemi

et al. 2023

Micromachines

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The market for microfluidic chips is experiencing significant growth; however, their development is hindered by a complex design process and low efficiency. Enhancing microfluidic chips’ design quality and efficiency has emerged as an integral approach to foster their advancement. Currently, the existing structural design schemes lack careful consideration regarding the impact of chip area, microchannel length, and the number of intersections on chip design. This inadequacy leads to redundant chip structures resulting from the separation of layout and wiring design. This study proposes a structural optimization method for microfluidic chips to address these issues utilizing a simulated annealing algorithm. The simulated annealing algorithm generates an initial solution in advance using the fast sequence pair algorithm. Subsequently, an improved simulated annealing algorithm is employed to obtain the optimal solution for the device layout. During the wiring stage, an advanced wiring method is used to designate the high wiring area, thereby increasing the success rate of microfluidic chip wiring. Furthermore, the connection between layout and routing is reinforced through an improved layout adjustment method, which reduces the length of microchannels and the number of intersections. Finally, the effectiveness of the structural optimization approach is validated through six sets of test cases, successfully achieving the objective of enhancing the design quality of microfluidic chips.

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Flexible joint parameters identification method based on improved tracking differentiator and adaptive differential evolution

Cited by 3 publications

References 23 publications

A fast transient tracking differentiator for high-precision motion systems

A fast transient tracking differentiator for high-precision motion systems

Dynamic Modeling and Parameter Identification of Double Casing Joints for Aircraft Fuel Pipelines

Structural Optimization Design of Microfluidic Chips Based on Fast Sequence Pair Algorithm

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