Patents Assigned to Dalian University of Technology
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Publication number: 20220118543Abstract: The present disclosure relates to the technical field of dissimilar welding of Cu and a steel, and in particular to a welding wire for dissimilar welding of Cu and a steel and a preparation method thereof and a method for welding Cu and a steel. The present disclosure provides a welding wire for dissimilar welding of Cu and a steel, including, in percentages by mass, 5-25% of iron phase, less than 0.1% of inevitable impurities, and copper matrix. The welding wire of the present disclosure, containing two elements, i.e. copper and iron, is conducive to the mixing of the two phases—copper and iron—during the welding process, to form a mutual soluble region, thereby makes it possible to greatly increase the weldability, reduce the width of the weld, effectively overcome the tendency of cracks, and thus to ensure the formed weld with a high crack resistance.Type: ApplicationFiled: December 23, 2020Publication date: April 21, 2022Applicants: Dalian University of Technology, Ningbo Institute of Dalian University of TechnologyInventors: Yubo ZHANG, Tingju LI, Jinchuan JIE, Shipeng YUE, Shichao LIU, Tongmin WANG, Zhiqiang CAO, Yiping LU, Huijun KANG, Zongning CHEN, Enyu GUO
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Patent number: 11292057Abstract: The present invention discloses a method for manufacturing a thin-walled metal component by three-dimensional (3D) printing and hot gas bulging. The present invention uses 3D printing to obtain a complex thin-walled preform, which reduces a deformation during subsequent hot gas bulging. The present invention avoids local bulging thinning and cracking, undercuts at the parting during die closing, and wrinkles due to the uneven distribution of cross-sectional materials, etc. The present invention obtains a high accuracy in the form and dimension through hot gas bulging. After a desired shape is obtained by hot gas bulging, a die is closed to keep the component under high temperature and high pressure for a period of time, so that a grain and a phase of the material are transformed to form a desired microstructure.Type: GrantFiled: April 30, 2020Date of Patent: April 5, 2022Assignee: Dalian University of TechnologyInventors: Zhubin He, Yi Xu, Jiangkai Liang, Wei Du, Peng Lin
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Patent number: 11295168Abstract: The invention discloses a depth estimation and color correction method for monocular underwater images based on deep neural network, which belongs to the field of image processing and computer vision. The framework consists of two parts: style transfer subnetwork and task subnetwork. The style transfer subnetwork is constructed based on generative adversarial network, which is used to transfer the apparent information of underwater images to land images and obtain abundant and effective synthetic labeled data, while the task subnetwork combines the underwater depth estimation and color correction tasks with the stack network structure, carries out collaborative learning to improve their respective accuracies, and reduces the gap between the synthetic underwater image and the real underwater image through the domain adaptation strategy, so as to improve the network's ability to process the real underwater image.Type: GrantFiled: December 4, 2020Date of Patent: April 5, 2022Assignee: Dalian University of TechnologyInventors: Xinchen Ye, Rui Xu, Xin Fan
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Patent number: 11279992Abstract: The present invention provides a radiation resistant high-entropy alloy and a preparation method thereof. A general formula of the radiation resistant high-entropy alloy is TiZrHfVMoTaxNby, where 0.05?x?0.25, 0.05?y?0.5, and x and y are molar ratios. The preparation method of the radiation resistant high-entropy alloy comprises the following steps: mixing Ti, Zr, Hf, V, Mo, Ta, and Nb in order, and conducting vacuum levitation induction melting or vacuum arc melting, to obtain the radiation resistant high-entropy alloy. The high-entropy alloy in the present invention has an excellent irradiation resistance, and does not suffer radiation hardening damage under simulated helium ion irradiation. When helium bubbles are of same sizes as those of conventional alloy, the bubble density of the high-entropy alloy is far lower than that of the conventional alloy, and the lattice constant thereof decreases abnormally after irradiation.Type: GrantFiled: December 20, 2019Date of Patent: March 22, 2022Assignee: Dalian University of TechnologyInventors: Yiping Lu, Huanzhi Zhang, Tingju Li, Tongmin Wang, Zhiqiang Cao, Jinchuan Jie, Huijun Kang, Yubo Zhang, Zongning Chen, Enyu Guo
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Publication number: 20220080488Abstract: The present disclosure provides a device for super cryogenic forming of a metal thin-walled curved surface part, including a super cryogenic medium conveying and pressurizing unit, a press, a die unit and a control system. A blank holder cylinder, a blank holder slide, a deep drawing cylinder and a deep drawing slide are disposed on the press. The die unit includes a male die, a blank holder and a female die. The super cryogenic medium conveying and pressurizing unit includes an autoboosting cryogenic container. A cryogenic channel in the blank holder, a cryogenic channel in the female die and a cavity of the female die are communicated with an outlet of the autoboosting cryogenic container by cryogenic pipes, respectively. A cryogenic pump is disposed on the cryogenic pipe between the cavity of the female die and the autoboosting cryogenic container.Type: ApplicationFiled: September 14, 2021Publication date: March 17, 2022Applicant: Dalian University of TechnologyInventors: Shijian Yuan, Xiaobo Fan
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Publication number: 20220049325Abstract: The present disclosure provides a method for protection against fretting fatigue by compound modification via laser shock peening and coating lubrication, where a group of micro-pits distributed into a regular array is firstly formed in a surface of a metal material by using laser shock peening, with a single micro-pit having a diameter of 1 to 10 mm and a depth of 1 to 20 ?m; and the micro-pits are then coated with a lubricant by coating preparation. Based on the micro-pit styling feature and surface residual compressive stress introducing feature of the laser shock peening, with compound modification by surface texturing via the laser shock peening and coating lubrication, the surface of the material can be reinforced by residual compressive stress, coating lubrication and surface micro-pit texturing with a synergistic effect, thus allowing for improved fretting fatigue behavior of the material.Type: ApplicationFiled: July 28, 2021Publication date: February 17, 2022Applicants: Dalian University of Technology, AVIC Manufacturing Technology InstituteInventors: Xuesong FU, Zhiqiang LI, Ziwen CAO, Maozhong LUO, Wenlong ZHOU, Guoqing CHEN, Yufei ZU
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Publication number: 20220049334Abstract: Provided is a performance controlling method for a high-strength aluminum alloy shell during an ultra-low temperature forming process. The present disclosure greatly improves the performance of an aluminum alloy sheet by applying an ultra-low temperature. The present disclosure cools the aluminum alloy sheet to an ultra-low temperature by using an ultra-low temperature cooling medium, so as to compensate for insufficient hardening caused by insufficient deformation and avoid cracking caused by increased deformation. The present disclosure cools the sheet blank zonally according to a deformation law of a desired curved part, and controls the ultra-low temperature distribution of the sheet blank during forming so as to promote the formation of a substructure in a small-deformation zone. In this way, the present disclosure improves a subsequent age-hardening effect, and corresponding uniformity of microstructure and performance, and effectively solves the problem of non-uniformity due to uneven deformation.Type: ApplicationFiled: March 1, 2021Publication date: February 17, 2022Applicant: Dalian University of TechnologyInventors: Xiaobo Fan, Shijian Yuan, Zhubin He
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Patent number: 11242585Abstract: An iron-based superalloy for high temperature 700° C. with coherent precipitation of cuboidal B2 nanoparticles, belongs to the field of heat-resistant stainless steel, including Fe, Cr, Ni, Al, Mo, W, Zr, B elements. C, Si, Mn, S, P, O, N are impurity elements. The weight percent (wt. %) of its alloy composition is Cr: 10.0˜12.0, Ni: 13.0˜15.0, Al: 6.0˜7.0, Mo: 2.0˜3.0, W: 0.3˜0.7, Zr: 0.03˜0.05, B: 0.004˜0.007, C?0.02, Si?0.20, Mn?0.20, S?0.01, P?0.02, O?0.005, N?0.02, Fe: balance; and the atomic percent ratio of Zr/B is 1:1, the atomic percent ratio of Cr/(Mo+W) is 8:1, and the atomic percent ratio of Mo/W is 8:1. The coherent precipitation of cuboidal B2 nanoparticles in ferritic matrix through the alloy composition design.Type: GrantFiled: June 9, 2021Date of Patent: February 8, 2022Assignee: Dalian University of TechnologyInventors: Qing Wang, Zhenhua Wang, Chuang Dong
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Patent number: 11238602Abstract: The present invention provides a method for estimating high-quality depth map based on depth prediction and enhancement sub-networks, belonging to the technical field of image processing and computer vision. This method constructs depth prediction subnetwork to predict depth information from color image and uses depth enhancement subnetwork to obtain high-quality depth map by recovering the low-resolution depth map. It is easy to construct the system, and can obtain the high-quality depth map from the corresponding color image directly by the well-trained end to end network. The algorithm is easy to be implemented. It uses high-frequency component of color image to help to recover the lost depth boundaries information caused by down-sampling operators in depth prediction sub-network, and finally obtains high-quality and high-resolution depth maps. It uses spatial pyramid pooling structure to increase the accuracy of depth map prediction for multi-scale objects in the scene.Type: GrantFiled: January 7, 2019Date of Patent: February 1, 2022Assignee: Dalian University of TechnologyInventors: Xinchen Ye, Wei Zhong, Haojie Li, Lin Lin, Xin Fan, Zhongxuan Luo
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Patent number: 11223190Abstract: An eddy current energy-dissipating spacer is mainly composed of a spacer frame, a conductor clamp and energy-dissipating elements. The eddy current energy-dissipating spacer not only provides the function of an ordinary spacer, but also reduces the vibration of the transmission lines; and at the same time, can effectively reduce the vibration of the transmission lines, especially the torsional vibration by adopting the eddy current and viscoelastic material for energy dissipation; improves the eddy current strength by adjusting the gear radius ratio, thus increasing the damping force; can adjust the damping parameters by adjusting the magnetic field strength of the permanent magnet; can produce long-term stable vibration reduction effect by adopting the permanent magnet to provide continuous magnetic field without additional external energy input; can effectively avoid the magnetic flux leakage of magnetic circuits by adopting the magnetic material.Type: GrantFiled: February 21, 2019Date of Patent: January 11, 2022Assignee: Dalian University of TechnologyInventors: Xing Fu, Hongnan Li, Wenlong Du
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Patent number: 11221273Abstract: A method for automatically detecting the free vibration response segment of the high-speed railway bridges after trains passing. First, pre-select the test response sequence to be decomposed based on the maximum of the time instants corresponding to the absolute maximums of the response vectors at various measuring point. Then, Extract the single-frequency modal response from the test response by the iterative variational mode decomposition and fit the envelope amplitude of the modal response by Hilbert transform. Finally, the vibration features at each time instants are marked as decay vibration or non-decay vibration. The longest structural response segment that meets the decay vibration features is determined as the detected free vibration response segment for modal identification. This invention can effectively detect the free vibration data segment without human participation, which is of great significance for the real-time accurate modal analysis of high-speed railway bridges.Type: GrantFiled: March 1, 2019Date of Patent: January 11, 2022Assignee: Dalian University of TechnologyInventors: Tinghua Yi, Xiaomei Yang, Chunxu Qu, Hongnan Li
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Patent number: 11199502Abstract: The present invention discloses a fully visual flow loop system for studying hydrate blockage.Type: GrantFiled: November 19, 2018Date of Patent: December 14, 2021Assignee: Dalian University of TechnologyInventors: Yongchen Song, Jiafei Zhao, Zheyuan Liu, Weiguo Liu, Yu Liu, Huiyong Liang, Jiawei Chu, Mingjun Yang, Yanghui Li
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Publication number: 20210363553Abstract: The disclosure relates to a device for fermentation integrated with separation and purification of acetone, butanol, and ethanol (ABE) or butanol alone, including a medium tank (1), used for supplying a medium into a bioreactor; a bioreactor (2), connected with the medium tank (1), used for fermentation; a gas distributor (9), used for supplying gas bubble to the fermentation broth; a membrane separation unit (4), with gas communication to the bioreactor (2), used for receiving a gas with ABE or butanol from the bioreactor and separating ABE or butanol; a condensation unit (5), used for recovering ABE or butanol; a vacuum manometer (6) and a vacuum pump (8), used for supplying a force for driving ABE or butanol in a vapor form; and product tank (7), used for receiving a product.Type: ApplicationFiled: August 5, 2021Publication date: November 25, 2021Applicant: Dalian University of TechnologyInventors: Chuang Xue, Chao Zhu, Lijie Chen
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Patent number: 11124317Abstract: A method for prediction of key performance parameters of an aero-engine in transition condition. Bench test data for an aero-engine in transition condition provided by a research institute is used for establishing a training dataset and a testing dataset first; parameter combination is used for predicting and analyzing engine exhaust temperature based on the idea of information fusion; and the method of rolling windows is used for rolling learning in order to predict the parameters such as low pressure rotor speed and exhaust temperature of an engine from the perspective of practical engineering application.Type: GrantFiled: January 26, 2018Date of Patent: September 21, 2021Assignee: Dalian University of TechnologyInventors: Shuo Zhang, Jibang Li, Ximing Sun, Min Liu
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Patent number: 11119016Abstract: A digital image measurement device and method for the surface deformation of specimen based on sub-pixel corner detection is disclosed. This digital image measurement device is composed of a new type of image pressure cell, a complementary metal-oxide-semiconductor (CMOS) camera, a camera bracket, a flexible lens hood, a computer and matching measurement software. This method discretizes the specimen into several four-node finite elements by printing grids on the specimen and takes corners of the grids as the nodes of the finite elements; tracks the deformation of the feature points in real time by edge detection and corner detection based on sub-pixel; captures the deformation of the whole surface of the specimen by the two flat mirrors which are at an 120° angle behind the specimen; achieves the observation of the deformation of the whole surface by conducting splicing and error correction on the three images.Type: GrantFiled: October 18, 2017Date of Patent: September 14, 2021Assignees: Suzhou H-C Soil & Water Science and Technology Co., Ltd, Dalian University of TechnologyInventors: Longtan Shao, Xiaoxia Guo, Yonglu Liu, Chuan Huang, Mingming Wu, Xicheng Li, Pingxin Xia, Peng Ju, Xiao Liu, Chun Wang, Jie Xue, Ying Wang
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Patent number: 11118646Abstract: An active tuned mass damper applied to the offshore monopile wind turbine belongs to the field of marine technology. A mass block is connected to the inner wall of the tower through a spring. The two ends of the damper and the force actuator are connected to the mass block and the inner wall of the tower, respectively. When the installation of tower is finished, the spring and the damper begin to work. The movement of mass block will partly offset the movement of the tower caused by the wave force. The force actuator starts to work before the mating. The exact position of the nacelle can be obtained from the Global Positioning System (DGPS). The position of tower can be adjusted in the horizontal plane through the force actuator. So, the offshore installation time for nacelle will be saved. The whole installation time and cost will also be reduced.Type: GrantFiled: February 28, 2018Date of Patent: September 14, 2021Assignee: Dalian University of TechnologyInventors: Zhiyu Jiang, Zhengru Ren, Wei Shi, Dezhi Ning
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Patent number: 11118198Abstract: The disclosure relates to a method for fermentation integrated with separation and purification of acetone, butanol, and ethanol (ABE) or butanol alone, comprising the following steps: 1) obtaining ABE by fermentation using an acetone-butanol-producing bacterium or obtaining butanol using a butanol-producing bacterium; 2) using a “vapor-stripping-vapor-permeation” method (briefly VSVP) for online separation and purification of ABE or purifying butanol from the fermentation broth; wherein the VSVP method comprises the following steps: introducing a gas bubble into the fermentation broth comprising active cells for fermentation to vaporize ABE or Butanol; subjecting the gas along with the vaporized ABE or Butanol to a membrane separation unit to pass through the membrane; recovering ABE or Butanol, or subjecting ABE or Butanol to a next separation device.Type: GrantFiled: June 15, 2016Date of Patent: September 14, 2021Assignee: Dalian University of TechnologyInventors: Chuang Xue, Chao Zhu, Lijie Chen
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Patent number: 11105758Abstract: A prediction method for mold breakout based on feature vectors and hierarchical clustering is disclosed, which comprises: respectively extracting temperature feature vectors of historical data under sticking breakout and normal conditions and on-line actually measured data to establish a feature vector sample set; performing normalization and hierarchical clustering on the sample set; and checking and judging whether the feature vectors extracted on line belong to a breakout cluster, and then identifying and predicting mold breakout.Type: GrantFiled: August 12, 2019Date of Patent: August 31, 2021Assignee: Dalian University of TechnologyInventors: Xudong Wang, Haiyang Duan, Man Yao
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Patent number: 11093582Abstract: A method for calculating axis deviation of rotor assembly based on end face runout measurement comprises three parts: calculation of three contact points, a triangle judgment criterion and a homogeneous coordinate transformation algorithm of a deviation matrix. Based on the measured end face runout data in production practice, the method realizes the prediction of axis deviation before assembly, improves the concentricity of rotors after assembly, also greatly increases the one-time acceptance rate of assembly and has important practical guiding significance for axis prediction as well as assembly phase adjustment and optimization in the assembly process of aero-engine rotor pieces.Type: GrantFiled: September 12, 2018Date of Patent: August 17, 2021Assignee: Dalian University of TechnologyInventors: Qingchao Sun, Xin Liu, Yichao Gao, Yunlong Wang
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Patent number: 11090743Abstract: A mutual-lapping device and mutual-lapping method for improving processing precision based on the principle of error averaging is proposed. The device including driving friction wheel, driving belt pulley, transmission belt A, connecting rod A, rotation shaft segment A, multi-ball sleeve, mutual-lapping gear A, tension spring, driven friction wheel, pendulum bar of the driven friction wheel, driven belt pulley, transmission belt B, connecting rod B, pressure spring of tensioning pulley, tensioner mechanism, rotation shaft segment B and mutual-lapping gear B. By mutual lapping the high-precision gears, not only the pitch deviation, tooth profile deviation, helix deviation and runout can be reduced synchronously, but also the machining cost is low. Meanwhile, the effect of improving pitch accuracy, profile accuracy, helix accuracy and runout accuracy and reducing surface roughness is remarkable.Type: GrantFiled: May 9, 2018Date of Patent: August 17, 2021Assignee: Dalian University of TechnologyInventors: Siying Ling, Xunlian Wang, Ming Ling, Yilei Chen, Huiyang Zhang, Xiaodong Wang, Liding Wang