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7th International Conference on Design Engineering and science, ICDES 2022

作者： Wu, Tingwei Science and Technology on Particle Transport and Separation Laboratory Jintang Road No.168 Tianjin China

The unbalanced mass will cause forced vibration of the pressure vessel when it rotates, and the magnitude of the unbalanced mass is positively correlated with the amplitude of the pressure vessel. Therefore, the study of unbalanced mass is of great significance to the safety of rotating pressure vessels. The influence of form and position tolerances and assembly tolerances on the unbalanced quality of pressure vessel parts is analyzed, and the normal distribution model is used to simulate the tolerance distribution of parts in mass production, and then the total unbalanced mass of the pressure vessel is calculated by the vector synthesis method. Through sensitivity analysis, the parts and key positions that have a greater impact on the total unbalanced mass of the pressure vessel are found, and the geometric tolerances of the parts with high process difficulty are optimized, which provides a theoretical basis for the tolerance optimization design work of the rotating pressure vessel. © Published under licence by IOP Publishing Ltd.

关键词： Pressure vessels

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Fatigue life prediction for corrugated compensators in high-pressure pipelines based on multiple factors correction 4

Fatigue life prediction for corrugated compensators in high-...

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4th International Conference on Advanced Manufacturing technology and Electronic Information, AMTEI 2024

作者： Yang, Zilong Wang, Liming Shu, Zhaoxia Yang, Fujiang National Key Laboratory of Particle Transport and Separation Technology Tianjin300180 China Research Institute of Physical and Chemical Engineering of Nuclear Industry Tianjin300180 China

ISBN: (数字)9781510688247

ISBN: (纸本)9781510688230

The issue was examined for corrugated compensators experiencing fatigue failure in high-pressure pipelines with complicated operating circumstances. A finite element model was established for stress simulation of the corrugated compensator under coupled load containing internal pressure and axial force. And a method was proposed to calculate the stress concentration factor using path integral. The corner area of the corrugated compensator was predicted to be a risky location for the fatigue crack sprouting. By carefully taking into account Goodman average stress correction, stress concentration factor, surface treatment procedure, load form, etc., the fatigue life prediction model of corrugated compensator was developed with multiple factors correction, and the values of each correction factor were obtained. According to the prediction model, the corrugated compensator's fatigue life prediction had a divergence of less than 10% from the engineering measured data. This result provides theoretical guidance for fatigue life assessment and design optimization of corrugated compensators in engineering applications. © 2025 SPIE.

关键词： Stress concentration

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Precession Fault Diagnosis Method Based on Butterworth Filter and Convolutional Neural Network 19th

Precession Fault Diagnosis Method Based on Butterworth Filte...

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19th Chinese Intelligent Systems Conference, CISC 2023

作者： Wang, Yumin Wu, Tingwei Su, Li Qian, Yi Li, Nan Research Institute of Physical and Chemical Engineering of Nuclear Industry Tianjin300180 China Science and Technology on Particle Transport and Separation Laboratory Tianjin300180 China

ISBN: (纸本)9789819968855

There is a rotating equipment that occasionally experiences abnormal precession during operation. This phenomenon may cause failure of rotating equipment. The identification of abnormal precession is mainly achieved by manually observing the damper spectrum. This method only stays in the laboratory stage. Many devices do not install sensors next to dampers due to cost considerations. The velocity sensor is a built-in sensor of the device. The signal of the velocity sensor is more complex due to the influence of velocity. To solve this problem, a convolutional neural network model is proposed in this paper for fault diagnosis of abnormal precession in velocity signals. First, standardization is used for processing. Second, butterworth filter is used to filter the signal. Finally, convolutional neural network are used for fault diagnosis of abnormal precession. The model is validated on the collected experimental data. The results show the accuracy of identifying abnormal precession of the model, verifying the effectiveness in diagnosing velocity signals. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Failure analysis

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Study on buckling of thin-walled composite cylinder under C-SS boundary condition 2

Study on buckling of thin-walled composite cylinder under C-...

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2024 2nd International Conference on Materials science and Intelligent Manufacturing, MSIM 2024

作者： Yang, Zilong Li, Wusheng Yang, Fujiang National Key Laboratory of Particle Transport and Separation Technology Tianjin 300180 China Research Institute of Physical and Chemical Engineering of Nuclear Industry Tianjin 300180 China

The spigot is a common connecting method for composite containers with thin walls. The fixture is closer to the thin-walled cylindrical shell with one end clamped and one end supported (C-SS) than the boundary conditions of typical pressure vessels, which are supported (SS-SS) or clamped (C-C) at both ends. Under the boundary condition, there are very few calculations and experimental research. A buckling model of the thin-walled composite vessel was built, and the critical load was determined using the energy technique and the classical thin-walled theory. Using nonlinear numerical analysis and FEM, the buckling mode was simulated. Numerical examples were used to examine the impacts of the spigot's length, boundary conditions, layup thickness, and sequencing on the critical load. The findings indicate that a shorter spigot, a thicker layup, and a small-angle layer closer to the center all increase the critical load. The boundary conditions of SS-SS, C-S, and C-C experienced increasing critical loads in that order;the latter was around 1.5∼2 times more than the former. Ultimately, external pressure tests were used to evaluate the buckling critical loads of two distinct laminated thin-walled composite vessels, confirming the correctness of both the FEM results and the theoretical model. The variance for the former was 15%, while the latter was 8%. The findings can serve as guidelines for designing interference and winding pre-stress spigots and the structural stability study of thin-walled composite vessels. © Published under licence by IOP Publishing Ltd.

关键词： Boundary conditions

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Research on moisture absorption characterization of wound composites based on surface concentration modified model 11

Research on moisture absorption characterization of wound co...

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2024 11th International Conference on Advanced Manufacturing technology and Materials Engineering, AMTME 2024

作者： Yang, Zilong Hu, Yuxia Li, Wusheng Yang, Fujiang National Key Laboratory of Particle Transport and Separation Technology Tianjin300180 China Research Institute of Physical and Chemical Engineering of Nuclear Industry Tianjin300180 China

Four groups of hygroscopic experiments of T700/epoxy composite wound rings at temperatures and humidities of 45°C/60%, 45°C/90%, 70°C/60%, and 70°C/90% were completed in order to study the moisture absorption characterization. Surface concentration correction models characterized by different types of functions such as linear, quadratic, sinusoidal, exponential, and others were proposed to establish a "three-stage" moisture absorption model, in which the initial stage was smooth, the middle stage grew rapidly, and the later stage tended to equilibrium. The theoretically predicted hygroscopic curves derived from quadratic and exponential functions were in good agreement with the experimental data, which revealed the difference in the moisture absorption characterization between the wound rings with high fiber volume and that of the laminates and fabrics and provided a basis for the prediction of the mechanical degradation and life of the wound composites in hygrothermal environments. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Exponential functions

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Prediction of hygroscopic behaviour of multi-angle wound composite rings based on fiber arrangement image feature 10

Prediction of hygroscopic behaviour of multi-angle wound com...

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10th International Conference on Mechanical Engineering, Materials, and Automation technology, MMEAT 2024

作者： Yang, Zilong Li, Wusheng Hu, Yuxia Yang, Fujiang National Key Laboratory of Particle Transport and Separation Technology Tianjin300180 China Research Institute of Physical and Chemical Engineering of Nuclear Industry Tianjin300180 China

ISBN: (纸本)9781510682634

Accurately predicting the hygroscopic behavior of composite materials is of great significance for the reliability design and life assessment of composite products. In this paper, a method was proposed for mesoscopic modeling and simulation of the hygroscopic behavior of composites based on fiber arrangement image features. Benefiting from the method the problem was solved that the classical model cannot take into account the influence of fiber arrangement mode on moisture absorption rate. The distribution laws were discussed on moisture absorption rate at different moments and different paths, and the differences were compared between the fiber order-arrangement and disorder-arrangement models. The simulation results showed that the obstruction of water molecule diffusion was more severe in the disorder-arrangement model established from the fiber arrangement images, and the moisture absorption rate of the composite was lower than that of the order-arrangement model. Finally, the accuracy of the disorder-arrangement model was verified by two groups of hygroscopic experiments at temperatures of 40°C and 80°C, respectively. The prediction accuracy of the model for the moisture absorption curve reached more than 0.92. © 2024 SPIE.

关键词： Fibers

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Numerical Studies on Lutetium Isotopic Selective Photoionization Based on a Three-Step Ionization Scheme

SSRN

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SSRN 2024年

作者： Lu, Xiaoyong Wang, Lide Science and Technology on Particle Transport and Separation Laboratory CNNC Tianjin300180 China

Numerical studies of lutetium selective photoionization have been carried out based on a threestep photoionization scheme, 5d6s2 2D3/2 → 5d6s6p4Fo5/2 → 5d6s7s4D3/2 → (53375 cm-1)1/2 → Lu+, by the density matrix theory. Atomic hyperfine structures and magnetic sublevels are considered in our photoionization dynamics model. To examine the effectiveness of this model, the simulated 176Lu ion signal are compared with the experimental results, and the simulated excitation cross sections of 176Lu excitation channels are compared with the analytical and experimental results. Semi-quantitative agreements are acquired for these two cases. On this basis, selective photoionization processes of two lutetium isotopes are simulated and discussed. Considering the ionization probability and abundance of target isotope, the 8.5-9.5-8.5 two-step excitation channel is optimal for 176Lu enrichment from natural lutetium. The influences of laser parameters and atomic Doppler broadening are presented numerically and optimization excitation conditions are identified. A new time-delayed configuration is proposed to implement multiple counter-propagating laser exposures for high target isotope abundance. © 2024, The Authors. All rights reserved.

关键词： Photoionization

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Spectral purity improvement of high-power pulsed lasers achieved by manipulating the nonlinear optical frequency conversion

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Optics Letters 2025年第10期50卷 3341-3344页

作者： Zhang, Yanlin Jin, Pixian Yang, Jie Jia, Xiaojun Lu, Huadong Peng, Kunchi State Key Laboratory of Quantum Optics Technologies and Devices Institute of Opto-Electronics Shanxi University Taiyuan030006 China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan030006 China National Key Laboratory of Particle Transport and Separation Technology Tianjin China

Pulsed lasers usually suffer from the conflict between low spectral purity (SP) and high output power because the mode-selection process is not able to be accomplished within a short pulse period. In order to address this issue, we present a fresh lossless mode-selection method (MSM) that is implemented by manipulating the loss induced by nonlinear optical frequency conversion (LINOFC). Based on this method, the SP up to 3.2 × 104 with 9.16 W output power is experimentally obtained, which is attributed to the stronger and faster process of nonlinear optical frequency conversion (NOFC). In the experiment, in order to manipulate the magnitude of LINOFC during the short pulse period, a fast polarization control module based on an electro-optic effect was designed to change the phase-matching condition of fundamental light in the nonlinear crystal. Differing from the traditional MSMs, the NOFC will be more effective when the output power is increased;thus, a higher SP and a large output power can be achieved simultaneously in pulsed lasers, which is a type of necessary source for quantum optics and photonics technologies. © 2025 Optica Publishing Group.

关键词： Optical frequency conversion

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A simulation and experimental study of dual-wavelength dye laser amplifiers

A simulation and experimental study of dual-wavelength dye l...

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2021 International On-line Workshop on separation Phenomena in Liquids and Gases: Modern Problems in Physics of separation in Nuclear Fuel Cycle, SPLG 2021

作者： Yang, Q.N. Zhang, X.W. Dai, X.K. Department of Engineering Physics Tsinghua University Beijing100084 China Science and Technology on Particle Transport and Separation Laboratory Tianjin300180 China

AVLIS requires a high average power laser beam of multiple wavelengths. There are two general ways to achieve such a beam. One is generating different wavelength laser beams by individual dye laser MOPA chains, then spatially combining them by a beam combiner. The other is combining different wavelength laser beams into one beam first, then co-amplifying it by a common MOPA chain. The latter one is more efficient. To further develop the method, this paper demonstrates a simulation and experimental study of dual-wavelength dye laser amplifiers. The one of the most critical parameters of a dual-wavelength laser beam is the power ratio of the two constituent beams, which can vary during the co-amplification. The simulation results show that for two laser beams with small wavelength difference, the spatial combination mismatches of two beams are the more dominant factor than the spectral differences in affecting the power ratio during the co-amplification. The result of the experiment is in good agreement with the simulation. © 2022 Institute of Physics Publishing. All rights reserved.

关键词： Laser beams

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Rotor Passing Through Critical Speed with Assistance of Electromagnetic Damper 6th

Rotor Passing Through Critical Speed with Assistance of Elec...

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6th International Symposium on Software Reliability, Industrial Safety, Cyber Security and Physical Protection of Nuclear Power Plant, ISNPP 2021

作者： Jia, Xiang-Yu Xu, Yang Bai, Yu-Jie Zhang, Kai Department of Engineering Physics Tsinghua University Beijing100084 China Science and Technology on Particle Transport and Separation Laboratory Tianjin300180 China

ISBN: (纸本)9789811911804

Active electromagnetic damping technology has plenty of advantages, such as convenient parameter setting, fast response speed, suppression of vibration in a wide frequency domain, and so on. In this paper, an electromagnetic damper with PID controller is designed and assembled. Function of shock absorption and effect on rotor passing through critical speed are studied respectively under different combinations of damper parameters. Response behavior of the damper under static conditions is obtained experimentally through data acquisition board after applying displacement impact to the damper mandrel. Then, the damper is installed to the rotor test system set to accelerate to the first-order bending critical speed, at which vibration response of the rotor is investigated. Results show that the form and effect of the damper attenuating the displacement disturbance and whether the system passes through critical speed smoothly or not are all restricted by setting of damper parameters. Under specific parameter combinations, the effect of the electromagnetic damper on passing criticality has shown to be better than that of the oil film damper. Moreover, a controller with additional zero and pole pairs connecting in series is proved to be able to further optimize the response behavior of the rotor-damper system in low frequency region. Through the experiment, effectiveness of design function of the electromagnetic damper is proved, which provides a reference for the selection of the working parameters and a research basis for further optimization of the damper. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Three term control systems

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