bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Centrifugal Blower Design and Optimization Method Based on Mean Camber Line Optimization and CFD
Authors: Fang Jiwei , Yan Peigang , Qin Jiang , Chen Huanlong 
Published: January 2023

Abstract
In recent years, with the development of domestic industry and the progress of production technology, the centrifugal blower, as a piece of nuclear equipment in the industry, needs to be upgraded and optimized to improve its performance. Thus, based on the mean camber line optimization and CFD, this paper carries out the design and aerodynamic optimization for a centrifugal blower, and a corresponding 3D aerodynamic optimization platform is built. Then the effects the mean camber lines have on the aerodynamic performance of the centrifugal blower are further analyzed. The results show that the stall margin and efficiency of the centrifugal blower are improved, going up to nearly 8.5% and 1.5%, respectively, after the optimization, while the total pressure ratio basically remains unchanged. The optimized mean camber lines can control the Mach number and restrain the separating flow more effectively, which contributes to improving the carrying capacity of the blower and verifies the advancement of the optimized platform. This provides a novel method for the design and optimization of centrifugal blowers.
Calibration for Installation Errors of Ultra-short Baseline Based on Direction Cosine
Authors: Luo Yu , Song Xizhao , Cheng Mengdi , Xin Mingzhen 
Published: January 2023

Abstract
In marine surveying and mapping, Ultra-short baseline (USBL) positioning system can provide accurate location information. So the USBL is the important guarantee of other marine jobs. However, under the influence of a complex marine environment, system errors, and acoustic curves, ultra-short baselines are subject to installation errors when installed, and the positioning accuracy can be seriously disturbed. To this end, this paper uses the direction cosine method to calibrate installation errors. To further improve positioning accuracy, this new method also consider the sound line correction. This method uses an equal gradient soundtracking algorithm to correct sound bending errors, constructs the error equation based on the transformation relationship between different coordinate systems by the direction cosine method, and linearizes the transformation parameters between the coordinate systems. The above two steps complete the calibration of installation errors of the USBL. The simulation results show that the underwater target position distribution calibrated by this method has a large convergence. The deviations from the data in all directions are concentrated around the zero point and approximately conform to a Gaussian distribution. The results indicate that the algorithm greatly improves the results of ultra-short baseline positioning and significantly increases the accuracy of underwater target positioning.
Research on Precise Flow Control and Anti-interference Performance of Load Sensitive Multi-way Valve with After-valve Compensation
Authors: Ye Yuan , Fu Ling , Junhua Zhang , Wang Wei , Yanbin Liu , Wu Bin 
Published: January 2023

Abstract
Regarding a load-sensitive system with after-valve compensation, in the case of a single action or composite action, theoretically, the flow of each channel neither varies with the load pressure of this channel, nor is it affected by the flow of other channels, and the anti-interference performance is good. In fact, due to the influence of factors such as the flow passage of the valve body, the matching between the pressure compensation valve and the main spool, its flow control and anti-interference performance are difficult to achieve good results, which has a great impact on the synchronization, rapid action impact and micro motion characteristics of the main engine of construction machinery. This paper studies the simplification and analysis of the system pressure drop diagram, the matching characteristics between the pressure compensation valve and the main valve, accurate modeling and simulation technology, solves the problems of flow fine control and anti-interference performance, improves the flow control accuracy of a single action and compound action, and enhances the anti-interference performance. The real vehicle test shows that the self-developed multi-way valve for compensating for load sensitivity behind the valve is installed on the 6T small excavation. The initial position of the excavator’s track is aligned along a straight line. After the test runs for 20 meters, the track offset is measured. The fast forward offset is only 20mm, and the slow forward offset is only 7mm.
The Hollow Die Design of Suspension Protective Type
Authors: Liu Yue , Cai Zhenpan , Zeng Shiqi , Chen Jiajie , Jiang Qirui 
Published: January 2023

Abstract
Because semi-hollow aluminum profiles are quite common in practice and have a large market demand, these profiles are characterized by a long cantilever, large tongue ratio, high complexity of mold design, and mold problems that have been bothering enterprises. These profiles are characterized by the long cantilever, large tongue ratio, high complexity of mold design, and mold problems that always have troubled enterprises. In order to solve this kind of mold strength problem, the engineering and technical personnel at home and abroad have carried out extensive research and have also obtained some successful experience. For example, mature die structures include split extrusion die and inlaid extrusion die, but these structures have certain applicable objects and conditions in practical application and have certain limitations in structure. Therefore, it is necessary to propose new and effective high-strength dies. A new type of die was present. The new die structure was named covering and protection die. With a actual product, the determination of structure parameters that it included the arrangement of portholes and the structure design of the chamber and the selection of bearings were introduced in detail. The features of the new structure were simple and easy to be processed. The practice shows that the new die can extended the life, increase of efficiency and reduce cost. The high precision dimensions and good surface quality were obtained. The new die is worth promoting. The purpose is to provide reliable data and reference for further research and development of the structure of semi hollow aluminum profiles.
Double-phase refractory medium entropy alloy NbMoTi via selective laser melting (SLM) additive manufacturing
Authors: Chen Yinan , Li Bo 
Published: January 2023

Abstract
Elemental metals Nb and Mo are common refractory metals, performing good properties in a high-temperature working environment. While due to their high melting points, they are hard to be manufactured. Besides, elemental metal with a single BCC phase performs onefold properties, which promotes the design of medium/high entropy refractory alloys. This paper focuses on the formability analysis of refractory metals Mo, Nb and mixed MoNbTi powder printed by SLM. It successfully demonstrated for the first time that laser metal deposition can be used to produce MoNbTi high-entropy alloy from a blend of elemental powders by in-situ alloying with the assistance of the Flow 3D app. The densities of elemental Nb, Mo and MoNbTi manufactured by the corresponding optimized printed parameters were 99.41%, 99. 13% and 97.38%, respectively. As-built MoNbTi high-entropy alloy contained FCC+BCC double phase. The FCC phase is diffusively precipitated in the BCC phase, and the boundary is moist.
Simulation of the solidification organization of X15CrNiSi20-12 alloy castings during investment casting based on the CAFE model
Authors: Xiao Zeyuan , Dong Shengquan , Nie Song , Ma Zhien , Lv Zhaozhao 
Published: January 2023

Abstract
In this work, the CAFE (Cellular Automata Finite Element) model was used to simulate the grain growth of X15CrNiSi20-12 austenitic stainless steel during the investment casting process, and the effects of shell thickness, shell temperature, casting temperature, and cooling rate on the solidification organization were investigated by orthogonal tests. The results show that the cooling method has an important effect on the formation of equiaxed crystals. However, the shell temperature, shell thickness, and casting temperature have a smaller effect on the formation of equiaxed crystals. A more equiaxed fine grain structure can be obtained by using a shell thickness of 7 mm, shell temperature of 1143.15 K, casting temperature of 1913.15 K, and water-cooling conditions. In addition, a decrease in the shell thickness, shell temperature, and casting temperature can lead to an increase in the grain size, while an increase in the cooling rate will lead to smaller grain size and increase the number of equiaxed fine crystals, thus improving the mechanical properties of the material.
A Method of Velocity Estimation for an Underwater Moving Source in Wave-Number Domain Based on The Warping Transform
Authors: Shiwei Xie , Ming Xu , Xiao Yuan , Mingyu Gao 
Published: January 2023

Abstract
When a single hydrophone is stationary and the underwater acoustic source is moving linearly at a constant velocity at the same depth, the phase of the received sound pressure signal in the frequency domain varies nonlinearly with time. Phase linearization can be achieved by warping transformation, so a method based on warping transformation is proposed to estimate the motion parameters of the source based on warping transformation. Firstly, the warping operators under different motion parameters are constructed and then used to resample the received sound pressure. Secondly, the corresponding wave-number spectrum is obtained by the Fourier transform of the resampled sound pressure. Finally, only when the search value of the motion parameter matches the real value, the energy magnitude of the wave-number spectrum concentrating in the concerned interval is maximum. Thus, the estimation of motion parameters is achieved. Simulation data verify the effectiveness of the method. Compared with the traditional Minimum Mean Square Error (MMSE) method, the proposed method has better performance in velocity estimation at low speeds and low frequencies.
Research on the Influence of Fault Arc on Polyimide Insulation Materials
Authors: Tang Muhan , Yue Pengcheng , Duan Xiongying , Ma Chang , Kong Fancong , Liao Minfu 
Published: January 2023

Abstract
In modern grid systems, electrical fires caused by faulty arcs occur more frequently. Arc protective clothing is the equipment that can effectively protect personal safety. Among them, polyimide insulation materials have the advantages of high-temperature resistance and high thermal resistance. Their performance in the field of arc protection is of high research value. In this paper, the effect of faulty arc on polyimide insulation material is studied by experimental and simulation control modes. The COMSOL software is used to simulate the process of electric arc affecting polyimide insulation material, and to simulate the physical field distribution of electric arc with different electrode spacing and different arc currents. An arc generation device is built, a copper calorimeter is designed to record the temperature rise of each experiment, a variety of arc parameters is changed, and the performance of polyimide insulation materials is analyzed to block the fault arc. A fault arc experimental platform was built, using a copper calorimeter to record the temperature rise of each experiment. Varying multiple arc parameters to analyze the performance of polyimide insulation materials in blocking fault arcs. The simulation and test results show that polyimide has an obvious barrier effect on the radiation temperature of the fault arc, and it can show good thermal insulation under different arc conditions, which proves that polyimide insulation materials have excellent protection performance against fault arcs in the energized operation environment.
Hydrodynamic performance in wave condition of autonomous amphibious robots
Authors: Cai Tong , Pan Dibo , Xu Xiaojun , Liu Bolong 
Published: January 2023

Abstract
Autonomous amphibious robot has a wide application able to move on land and sailing in water condition. In this paper, we design a new structure for autonomous amphibious robots, which can convert to water mode when coming through a water obstacle. Research on the hydrodynamic performance of amphibious robots in static water is carried out. To evaluate the impact of wave conditions on sailing characteristics, wave numerical simulation is studied. Results show that wave conditions will increase the resistance at low and medium velocities, with a maximum of 40% resistance increase at a speed of 1.5 m/s. The wave simulation model can capture wave dynamic flow well, including wave dissipation and turbulent energy loss.
Numerical Simulation of Unsteady Hydrodynamic Characteristics of Bionic Fin
Authors: Zhang Minghui , Su Yiming , Wang Chuanbao 
Published: January 2023

Abstract
A long uncompressed fin driven by fin rays is designed in this paper, and its kinematic model is established. The SST K-ω turbulence model is used to solve the N-S equation of three-dimensional unsteady incompressible fluid, and the hydrodynamic characteristics of the uncompressed fin are studied. The results show that when the undulating fin is started, the velocity of the surrounding fluid gradually increases with the movement of the fin surface, and the fluid moves from the leading edge of the undulating fin to the back edge along the fin surface. A relatively obvious anti-Karman vortex street is formed on both sides of the fin, and a jet is formed at the tail of the fin to generate forward thrust.
An Improved IMM-GPDA Tracking Algorithm
Authors: Xie Zhaoyang , Wang Shengli , Yu Jianguo 
Published: January 2023

Abstract
To improve the accuracy and efficiency of multi-maneuvering target tracking in dense clutter environments, an improved interactive multi-model generalized probabilistic data association (IMM-GPDA) algorithm is proposed in this paper. The algorithm introduces Doppler information into the measurement data. Firstly, the measurement data is pre-processed by double-threshold regional density clutter elimination, and then the pre-processed data is put into the improved IMM-GPDA algorithm with square-root cubature Kalman filter (SRCKF) and model transition probability adaptation for interaction, association, and filtering. Simulation results show that the algorithm has advanced accuracy, instantaneity, and robustness in tracking environments with multi-maneuvering targets and dense clutters.
Trajectory Tracking Control of the Wheeled Mobile Robot based on the Curve Tracking Algorithm
Authors: Peng Youhua , Zhang Peng , Fang Zheng , Zheng Shuaijie , Guo Zhijun , xing Dongxu 
Published: January 2023

Abstract
A controller based on the curve tracking algorithm is offered as a solution to the issue of the wheeled mobile robot’s trajectory not be precisely monitored. First, Utilizing a planar global coordinate system, the kinematics and dynamics models of the wheeled mobile robot is created. Then, the kinematic model of the actual and predicted trajectories is utilized to determine the trajectory tracking error of the wheeled mobile robot. By the trajectory tracking error system model, The curve tracking algorithm controller is employed in the outer loop control to remove the robot’s position and attitude deviation during trajectory tracking, while the PI controller is utilized in the inner loop control to precisely track the robot’s speed. The simulation results demonstrate that the suggested control technique can regulate the wheeled mobile robot’s pose error [xq yq θq]T within the ranges of 0.1m, 0.03m, and 0.03rad, which demonstrates the efficacy of the control approach.
Numerical Simulation of Flow around A Cylinder in Hyperbolic Flow Field Induced by Internal Solitary Waves
Authors: Dai Runfeng , Wang Fei , Wang Chunxiao , Li Peng , Qi Xiaoliang , Sun Rui 
Published: January 2023

Abstract
To study the flow field and hydrodynamic characteristics of hyperbolic flow around a cylinder caused by an internal solitary wave, the hyperbolic flow around the cylinder induced by the inner solitary wave, inlet condition is the lower deep horizontal velocity induced by the inner solitary wave and the two-dimensional Navier-Stokes equation is used as the flow field control equation according to the applicability conditions of the eKdV inner solitary wave theory. A numerical simulation method for the nonlinear action of internal solitary wave-induced hyperbolic flow on a horizontal cylinder is established. A series of calculation results show that the numerical simulation results of horizontal force on the cylinder are in good agreement with experimental results. The wakefield of hyperbolic flow around a cylinder has distinct characteristics. In the process of flow around the cylinder, the vortex does not fall off alternately and the lateral lift force is neglected. The force of internal solitary wave-induced hyperbolic flow on the cylinder is non-centrosymmetric, and with the increase of maximum Reynolds number and characteristic period, the horizontal resistance of the cylinder becomes unidirectional. Therefore, the maximum Reynolds number and the characteristic period affect the horizontal force of internal solitary wave-induced hyperbolic flow on a two-dimensional cylinder.
Research and Application of 5G Remote Control UAV with Aerial Electronic Fence
Authors: He Zhongli , Zou En , Guan Chunxi , Pang Bowei , Tang Guangfa , Ding Juan 
Published: January 2023

Abstract
Unmanned aerial vehicles (UAVs) are often out of control, lost, and crashed during use. The research of a 5G remote control UAV with an aerial electronic fence can solve these problems. The integrated application of 5G communication technology, Internet of Things technology, and electronic fence technology built through the GPS navigation cloud platform enables UAVs to achieve remote real-time control and electronic fence protection in the air through 5G. At the same time, UAVs can also achieve remote control, data transmission, image transmission, and other functions, so that UAVs can automatically and safely return in case of out-of-control failure, broaden the flight radius of UAVs, and improve the safety of UAVs.
Beam-based reconstruction of the shielded quench-heater fields for the LHC main dipoles
Authors: Richtmann L , Bortot L , Ravaioli E , Wiesner C , Wollmann D 
Published: January 2023

Abstract
Small orbit oscillations of the circulating particle beams have been observed immediately following quenches in the LHC’s superconducting main dipole magnets. Magnetic fields generated during the discharge into the quench heaters were identified as the cause. Since the resulting, shielded field inside the beam screen cannot be measured in-situ, the time evolution of the field has to be reconstructed from the measured beam excursions.
In this paper, the field-reconstruction method using rotation in normalized phase space and the optimized fitting algorithm are described. The resulting rise times and magnetic field levels are presented for quench events that occurred during regular operation as well as for dedicated beam experiments. Finally, different approaches to model the shielding behavior of the beam screen are discussed.
A design of ILC E-driven positron source
Authors: Kuriki M , Tajino H , Konno S , Liptak Z , Takahashi T , Fukuda M , Omori T , Seimiya Y , Urakawa J , Yokoya K , Kashiwagi S 
Published: January 2023

Abstract
ILC is an electron-positron linear collider based on Superconducting linear accelerator. Linear collider is the only solution to realize high energy electron-positron collision beyond the limit of synchrotron radiation energy loss by ring colliders. Beam current of injector of linear colliders is much larger than that of ring colliders because the beam is not reusable. Providing an enough amount of particles, especially positron is a technical issue. In this article, we present a design of electron driven positron source for ILC. After optimizations, the system design is established with an enough technical margin, e.g. avoiding potential damage on the production target.
Commissioning simulations for the DIAMOND-II upgrade
Authors: Chao H-C , Fielder R , Kallestrup J , Singh B , Martin I 
Published: January 2023

Abstract
The Diamond-II [1] storage ring, compared to Diamond, improves the natural emittance from 2.7 nm to 160 pm and the beam energy from 3 to 3.5 GeV. The number of straight sections is also doubled from 24 to 48 thanks to the modified hybrid six-bend-achromat lattice. To reduce the impact on the existing science program, the dark time period must be minimised. To assist in this aim, storage ring commissioning simulations have been carried out to predict and resolve possible issues. These studies include beam commissioning starting from on-axis first-turn beam threading up to beam based alignment and full linear optics correction with stored beam. The linear optics corrections with insertion devices are also included. The machine characterisations at different stages are compared. Considerations on realistic chamber limitations, error definitions and some commissioning strategies are also discussed.
A double dipole kicker for off and on-axis injection into ALBA-II
Authors: Benedetti G , Carlà M , Pont M 
Published: January 2023

Abstract
Injection into the ALBA-II storage ring will be performed off-axis in a 4 meters straight section with a single multipole kicker. We present a novel topology for the coils of the injection kicker, named double dipole kicker (DDK). The resulting magnetic field is the superposition of two opposite dipoles, generated by four inner and four outer conductor rods. When the eight rods are powered, the dipole term cancels and the remaining multipole field is used for off-axis injection. Alternatively, when the four inner rods are switched off, an almost pure dipole is produced, that is useful for on-axis injection during the commissioning. A prototype of DDK is presently under design to be installed and tested in the existing ALBA storage ring. The positioning of the rods is calculated in order to maximize the kick efficiency in mrad/kA and minimise the disturbance to the orbit and the emittance of the stored beam. A metallic coating with optimised thickness along the inner ceramic vacuum chamber should provide compensation for the eddy currents induced field in order to minimize the disturbance to the stored beam while ensuring sufficiently low heat dissipation by the beam image currents.
The status of the in-vacuum-APPLE II IVUE32 at HZB / BESSY II
Authors: Bahrdt J , Bakos J , Gaebel S , Gottschlich S , Grimmer S , Kuhn C , Knaack S , Laube F , Meseck A , Rethfeldt C , Rial E , Rogosch-Opolka A , Scheer M , Volz P 
Published: January 2023

Abstract
At BESSY II, two new beamlines for RIXS and for X-Ray-microscopy need a short period variably polarizing undulator. For this purpose, the first in-vacuum APPLE II undulator worldwide is under construction. The parameters are as follows: period length λ
0 = 32 mm, # periods = 78, minimum gap = 7mm. The design incorporates a force compensation scheme as proposed by two of the authors at the SRI 2018. All precision parts of the drive chain are located in air. New transverse slides for the transversal slit adjustment have been developed and tested. Optical Micrometers measure the gap and phase positions, similar to the system of the CPMU17 at BESSY II. They provide the signals for motor feedback loops. A new UHV-compatible soldering technique, as developed with industry, relaxes fabrication tolerances of magnets and magnet holders and simplifies the magnet assembly. A 10-period prototype has been setup for lifetime tests of the new magnetic keeper design. The paper summarizes the status of the undulator IVUE32.