Artykuły w czasopismach: „Tensioning”

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Liu, Xuechun, Yiwen Zhang, Ailin Zhang i Liang Wu. "Model test for the tensioning construction process of a large-span prestressed suspended dome". Advances in Structural Engineering 20, nr 4 (5.07.2016): 504–18. http://dx.doi.org/10.1177/1369433216655920.

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Before being tensioned, the stiffness of the upper reticulated shell of a prestressed suspended dome is small, and the lower cable–strut system is completely flexible. The shape and stiffness of the structure constantly change during the construction process; therefore, a construction experiment needed to be performed to ensure the success and safety of the tensioning process for practical engineering. A tensioning experiment was performed on a reduced scale model of a large-span suspended dome. The safety, internal forces, joint displacements, and cable tensions during the tensioning process were studied. The effects of the sequence, times, and magnitudes of the loop cable tensioning were studied. The unfavorable factors of friction loss at the cable–strut joint, tensioning sequence loss, and out-of-sync tensioning on the tensioning points were evaluated, and measures to reduce the friction loss were then proposed. Two tensioning schemes were tested, compared, and used to predict the potential difficulties in practical engineering construction. An optimized tensioning scheme was developed for practical engineering.

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Liu, Zhansheng, Guoliang Shi, Anshan Zhang i Chun Huang. "Intelligent Tensioning Method for Prestressed Cables Based on Digital Twins and Artificial Intelligence". Sensors 20, nr 24 (8.12.2020): 7006. http://dx.doi.org/10.3390/s20247006.

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In this study, to address the problems of multiple dimensions, large scales, complex tension resource scheduling, and strict quality control requirements in the tensioning process of cables in prestressed steel structures, the technical characteristics of digital twins (DTs) and artificial intelligence (AI) are analyzed. An intelligent tensioning of prestressed cables method driven by the integration of DTs and AI is proposed. Based on the current research status of cable tensioning and DTs, combined with the goal of intelligent tensioning, a fusion mechanism for DTs and AI is established and their integration to drive intelligent tensioning of prestressed cables technology is analyzed. In addition, the key issues involved in the construction of an intelligent control center driven by the integration of DTs and AI are discussed. By considering the construction elements of space and time dimensions, the tensioning process is controlled at multiple levels, thereby realizing the intelligent tensioning of prestressed cables. Driven by intelligent tensioning methods, the safety performance evaluation of the intelligent tensioning process is analyzed. Combined with sensing equipment and intelligent algorithms, a high-fidelity twin model and three-dimensional integrated data model are constructed to realize closed-loop control of the intelligent tensioning safety evaluation. Through the study of digital twins and artificial intelligence fusion to drive the intelligent tensioning method for prestressed cables, this study focuses on the analysis of the intelligent evaluation of safety performance. This study provides a reference for fusion applications with DTs and AI in intelligent tensioning of prestressed cables.

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Moatshe, Gilbert, Jorge Chahla, Alex Brady, Grant Dornan, Kyle Muckenhirn, Bradley Kruckeberg, Lars Engebretsen i Robert F. LaPrade. "The Influence of Graft Tensioning Sequence on Tibiofemoral Orientation during Bicruciate and Posterolateral Corner Knee Ligament Reconstruction: A Biomechanical Study". Orthopaedic Journal of Sports Medicine 6, nr 7_suppl4 (1.07.2018): 2325967118S0006. http://dx.doi.org/10.1177/2325967118s00066.

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Objectives: During a multiple knee ligament reconstruction, the graft tensioning order may influence the final tibiofemoral orientation and corresponding knee kinematics. Therefore, the objective of this study was to biomechanically evaluate the effect of different graft tensioning sequences on knee tibiofemoral orientation following multiple knee ligament reconstruction in a bicruciate ligament (anterior cruciate ligament [ACL] and posterior cruciate ligament [PCL]) with posterolateral corner [PLC] injured knee. Methods: Ten non-paired, fresh-frozen human cadaveric knees were utilized for this study. Following reconstruction of both cruciate and posterolateral corner ligaments and proximal graft fixation, each knee was randomly assigned to each of four graft tensioning order groups: (1) PCL → ACL → PLC, (2) PCL → PLC → ACL, (3) PLC → ACL → PCL and (4) ACL → PCL → PLC. The tibiofemoral orientation after graft tensioning was measured and compared to the intact states. Results: Tensioning the ACL first (tensioning order 4) resulted in posterior displacement of the tibia at 0° by 1.7 ± 1.3 mm compared to the intact state (p=0.002) (Figure 1). All tensioning orders resulted in significantly increased anterior tibial translation compared to the intact state at higher flexion angles ranging from 2.7 mm to 3.2 mm at 60° and 3.1 mm to 3.4 mm at 90° for tensioning orders 1 and 2 respectively (all p<0.001). There was no significant difference in tibiofemoral orientation in the sagittal plane between the tensioning orders at higher flexion angles. All tensioning orders resulted in increased internal tibial rotation (all p<0.001). Tensioning and fixing the PLC first (tensioning order 3) resulted in the most increases in internal rotation of the tibia; 2.4° ± 1.9°, 2.7° ± 1.8° and 2.0° ± 2.0° at 0°, 30° and 60° respectively (Table 1). Conclusion: None of the tensioning orders restored intact knee tibiofemoral orientation. Tensioning the posterolateral corner first should be avoided in bicruciate knee ligament reconstruction with a concurrent posterolateral corner reconstruction because it significantly increased tibial internal rotation. We recommend that the PCL be tensioned first, followed by the ACL to avoid posterior translation of the tibia in extension where the knee is primarily loaded with most activities and finally the PLC. [Figure: see text][Table: see text]

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Li, Bo, i Zhankuan Zhang. "Analysis and Optimization of the Tensioning Effect on a Wood-Cutting Circular Saw Blade Tensioned by Multispot Pressure". Forest Products Journal 69, nr 1 (1.01.2019): 61–69. http://dx.doi.org/10.13073/fpj-d-17-00063.

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Abstract In recent years, a multispot pressure tensioning process appeared in the field of circular saw blade manufacturing. Due to the insufficient understanding about the formation and evolution of the tensioning effect of this process, this study aimed to analyze and optimize the tensioning effect on a circular saw blade tensioned by multispot pressure. It could provide a theoretical basis and key technical parameters for regulating and controlling the tensioning effect of this process. In this article, the natural frequency and the tensioning stress field of a circular saw blade tensioned by multispot pressure were calculated by ABAQUS software. The simulated tensioning stress field was in agreement with the experimental results, which confirmed the accuracy of the simulation model. The influence of process parameters on the natural frequency and tangential tensile stress in the edge of the circular saw blade was examined and compared based on the orthogonal method. Simulation results show that the parameters of the multispot pressure tensioning process have different degrees of influence on the tensioning effect of a circular saw blade. Considering the natural frequency and tangential tensile stress in the edge of a circular saw blade synthetically, optimal process parameters for multispot pressure tensioning were obtained.

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Moatshe, Gilbert, Jorge Chahla, Alex W. Brady, Grant J. Dornan, Kyle J. Muckenhirn, Bradley M. Kruckeberg, Mark E. Cinque, Travis Lee Turnbull, Lars Engebretsen i Robert F. LaPrade. "The Influence of Graft Tensioning Sequence on Tibiofemoral Orientation During Bicruciate and Posterolateral Corner Knee Ligament Reconstruction: A Biomechanical Study". American Journal of Sports Medicine 46, nr 8 (28.06.2018): 1863–69. http://dx.doi.org/10.1177/0363546517751917.

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Background: During multiple knee ligament reconstructions, the graft tensioning order may influence the final tibiofemoral orientation and corresponding knee kinematics. Nonanatomic tibiofemoral orientation may result in residual knee instability, altered joint loading, and an increased propensity for graft failure. Purpose: To biomechanically evaluate the effect of different graft tensioning sequences on knee tibiofemoral orientation after multiple knee ligament reconstructions in a bicruciate ligament (anterior cruciate ligament [ACL] and posterior cruciate ligament [PCL]) with a posterolateral corner (PLC)–injured knee. Study Design: Controlled laboratory study. Methods: Ten nonpaired, fresh-frozen human cadaveric knees were utilized for this study. After reconstruction of both cruciate ligaments and the PLC and proximal graft fixation, each knee was randomly assigned to each of 4 graft tensioning order groups: (1) PCL → ACL → PLC, (2) PCL → PLC → ACL, (3) PLC → ACL → PCL, and (4) ACL → PCL → PLC. Tibiofemoral orientation after graft tensioning was measured and compared with the intact state. Results: Tensioning the ACL first (tensioning order 4) resulted in posterior displacement of the tibia at 0° by 1.7 ± 1.3 mm compared with the intact state ( P = .002). All tensioning orders resulted in significantly increased tibial anterior translation compared with the intact state at higher flexion angles ranging from 2.7 mm to 3.2 mm at 60° and from 3.1 mm to 3.4 mm at 90° for tensioning orders 1 and 2, respectively (all P < .001). There was no significant difference in tibiofemoral orientation in the sagittal plane between the tensioning orders at higher flexion angles. All tensioning orders resulted in increased tibial internal rotation (all P < .001). Tensioning and fixing the PLC first (tensioning order 3) resulted in the most increases in internal rotation of the tibia: 2.4° ± 1.9°, 2.7° ± 1.8°, and 2.0° ± 2.0° at 0°, 30°, and 60°, respectively. Conclusion: None of the tensioning orders restored intact knee tibiofemoral orientation. Tensioning the PLC first should be avoided in bicruciate knee ligament reconstruction with concurrent PLC reconstruction because it significantly increased tibial internal rotation. We recommend that the PCL be tensioned first, followed by the ACL, to avoid posterior translation of the tibia in extension where the knee is primarily loaded during most activities. The PLC should be tensioned last. Clinical Relevance: This study will help guide surgeons in decision making for the graft tensioning order during multiple knee ligament reconstructions.

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Kulinowski, Piotr, Piotr Kasza i Jacek Zarzycki. "The Analysis of Effectiveness of Conveyor Belt Tensioning Systems". New Trends in Production Engineering 3, nr 1 (1.08.2020): 283–93. http://dx.doi.org/10.2478/ntpe-2020-0023.

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AbstractThe publication presents the evaluation of the effectiveness of belt tensioning systems based on the results of model laboratory tests. The types of tensioning devices most commonly used in industry were selected for testing: winch, gravity, pneumatic and follower. The evaluation of the efficiency of belt tensioning devices is complex, as the tensioning system is not autonomous and is only part of the belt conveyor equipment. Therefore, the publication presents the impact of belt tension force on the durability of basic conveyor components such as the belt and its joints, and drums. The characteristics of the tested belt tensioning devices are presented and the construction and research capabilities of the laboratory model of the belt conveyor are described. Measuring systems mounted on the conveyor are described in detail, enabling recording of variable conveyor operating conditions, measuring belt speed, driving force and belt stress. The results of the research are the experimental static characteristics of the most commonly used tensioning devices, which show the relationship between the drive moment and the belt tensioning force. Obtained characteristics will allow the development of guidelines for the design and selection of the most effective belt tensioning devices.

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Shen, Sheng, Yao Wang, Sheng-Lan Ma, Di Huang, Zhi-Hong Wu i Xiao Guo. "Evaluation of Prestress Loss Distribution during Pre-Tensioning and Post-Tensioning Using Long-Gauge Fiber Bragg Grating Sensors". Sensors 18, nr 12 (23.11.2018): 4106. http://dx.doi.org/10.3390/s18124106.

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Prestress loss evaluation in prestressed strands is essential for prestressed structures. However, the sensors installed outside the duct can only measure the total prestress loss. The sensors attached on strands inside the duct also have several problems, such as inadequate durability in an aggressive environment and vulnerability to damage during tensioning. This paper proposes a new installation method for long-gauge fiber Bragg grating (LFBG) sensors to prevent accidental damage. Then the itemized prestress losses were determined in each stage of the pre-tensioning and post-tensioning according to the LFBG measurements. We verified the applicability of the LFBG sensors for prestress monitoring and the accuracy of the proposed prestress loss calculation method during pre-tensioning and post-tensioning. In the pre-tensioning case, the calculated prestress losses had less deviation from the true losses than those obtained from foil-strain gauges, and the durability of the LFBG sensors was better than foil-strain gauges, whereas in post-tensioning case, the calculated prestress losses were close to those derived from theoretical predictions. Finally, we monitored prestress variation in the strand for 90 days. The itemized prestress losses at each stages of post-tensioning were obtained by the proposed calculation method to show the prospect of the LFBG sensors in practical evaluation.

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Alekseev, Alexandr E., Igor O. Dumanskij i Alexey V. Prokhorov. "Plate Dampers in the Tensioning Plate Dampers in the Tensioning". Lesnoy Zhurnal (Forestry Journal), nr 5 (15.10.2021): 142–49. http://dx.doi.org/10.37482/0536-1036-2021-5-142-149.

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The article analyses strengths and weaknesses of bandsaw machines. While analysing we have found the relationship between the weaknesses and the tension of a band saw. Its use as a cutting tool leads to a decrease in the lateral rigidity and stability of the cutting section on the pulling chain. This leads to fluctuations in the cutting width, a decrease in the geometric accuracy of sawn timber and an increase in the roughness of the side surfaces of a kirf. The main types of tensioning unit mechanisms, which strengthen the tension and maintain its stability during operation, are defined, and common design flaws are described. Oil-filled metal plate dampers promote space-saving and low-inertia dampers for bandsaw machines with any basic saw blade tensioning mechanisms. The influence of the device on the level of dynamic fluctuations of the tensile force caused by the artificial eccentricity of the tension pulley was studied. The efficiency was evaluated by computer oscillography of the tensile load sensor signal and subsequent computer processing of the obtained oscillograms. The effectiveness of using damper devices is confirmed by the quality of sawing, which is characterized by a lower level of roughness of the lateral surfaces of the cut while reducing the variation in thickness of a workpiece. Methods of eliminating flaws with different types of tensioning units are reviewed, and the effectiveness of using oil-filled plate dampers is evaluated. The article presents the research technique and parameters of the experimental unit as well as the conclusions on the effectiveness of damping devices. For citation: Alekseev A.E., Dumanskij I.O., Prokhorov A.V. Plate Dampers in the Tensioning Units of Bandsaw Machines. Lesnoy Zhurnal [Russian Forestry Journal], 2021, no. 5, pp. 142–149. DOI: 10.37482/0536-1036-2021-5-142-149

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Mo, Qiu Yun, Zhan Kuan Zhang i Hao Li. "The Study on the Residual Stresses of Circular Sawblades with Spherical Surface Pressed Many Spots". Applied Mechanics and Materials 29-32 (sierpień 2010): 1323–26. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.1323.

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This paper is a comprehensive analysis about circular saws exerted the inertia stresses, thermal stresses and residual stresses inducted roll and hammer tensioning in working procedures. And analyze the weaknesses and the advantages of two methods of roll tensioning and hammer tensioning. In order to take advantages to compensate the weaknesses to bring forward a new tensioning method compressed many areas i.e. the tensioning spots compressed by using the roll-head whose surface is spherical, cylindrical or cone. The X-ray stress-checking instrument is used to test the residual stresses in the tensioned circular sawblades compressed on many spots. The result explains the stress distribution curve is very ideal and the residual stresses by tensioning almost offset the total inertia and thermal stresses inducted in the work. This explains it is a new circular tensioning method with developing value by compressing many spots. It exists in certain residual stresses on the rim of the sawblade’s central bore, outside and the areas near the slot bore because of the influence of the machine processes.

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He, Jia Yuan, Yan Wang i Nabil Gindy. "Investigation of Fixture Design Exploring Pre-Tensioning Forces". Advanced Materials Research 97-101 (marzec 2010): 3252–55. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.3252.

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Pre-tensioning forces are, in essence, the selective application of clamping forces applied prior to processess to create a “stress field” envelope that aids the processes of components. There are many potential functions of applying pre-tensioning forces, such as improvement of component rigidity, reduction of machining deflection, and holding of components to counteract the machining forces etc. However, the use of pre-tensioning forces has not been extensively and comprehensively investigated. The aim of this paper is to strengthen the understanding of the impact of applying pre-tensioning forces firstly on simple parts and specifically on the fixture design development by establishing a methodology of using pre-tensioning forces. To investigate the optimised fixture layout and clamping strategy, Finite Element Analyses (FEA) were established to show the effect of applying pre-tensioning forces on machining deflection. Meanwhile, the relevant model validation experiments were applied to verify the FEA models in this study appropriately. Eventually, the results show that the FEA simulations are sufficient and the use of pre-tensioning forces effectively reduces the machining deflection by using optimised clamping strategy.

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Kulinowski, Piotr. "ANALYTICAL METHOD OF DESIGNING AND SELECTING TAKE-UP SYSTEMS FOR MINING BELT CONVEYORS / ANALITYCZNA METODA PROJEKTOWANIA I DOBORU UKŁADÓW NAPINANIA DLA GÓRNICZYCH PRZENOŚNIKÓW TAŚMOWYCH". Archives of Mining Sciences 58, nr 4 (1.12.2013): 1301–15. http://dx.doi.org/10.2478/amsc-2013-0090.

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Abstract This article presents a method developed to design and select tensioning systems which makes use of standard calculations. It describes procedures for selecting and analysing the operation of devices tensioning the belt, which procedures are based on the static characteristics of these devices, and a proposal for introducing a substitute belt elasticity modulus that would make the calculations of the tensioning stroke length account for the value of the initial force tensioning the belt and for its sag between sets of idlers. Static characteristics of tensioning systems have been used to describe their operation and present the advantages and disadvantages of individual design solutions

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Michalik, Peter, i Vieroslav Molnar. "Test Equipment for Analysis of Samples Rubber – Textile Conveyor Belts by Help Industrial Metrotomographs". Applied Mechanics and Materials 683 (październik 2014): 208–12. http://dx.doi.org/10.4028/www.scientific.net/amm.683.208.

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The test equipment of samples for analysis of rubber-textile conveyor belts is a device designed to create tension and tracking the deformation in different cross sections of conveyor belts in one axis X. This construction is designed tensioning device, which allows the development of automatic tensioning force in one axis X-tensioning force F is exerted screw the nut with a torque wrench and a controlled strain-gauge sensor. Measured sample-textile conveyor belt is clamped in two adjustable clamping jaws ribbed belts for different thicknesses. Ribbed clamping jaws on one side of the tensioning device is attached to the frame and on the other hand are attached to the runner associated with the movable tensioning screw.

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LI, BO, i YUAN AN. "DEFORMATION BEHAVIOR OF CIRCULAR SAW BLADES WITH DIFFERENT BODY STRUCTURES AFTER ROLL TENSIONING". Wood Research 67, nr 3 (9.06.2022): 460–71. http://dx.doi.org/10.37763/wr.1336-4561/67.3.460471.

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A roll tensioning process for circular saw blades with four typical body structures was built with the finite element method. After roll tensioning, the elastoplastic deformation behaviors of the four blades were simulated and tested and the effects of roll reduction displacement on flatness were analyzed. The abilities of the blades to withstand cutting temperature load after the roll tensioning process were compared. The theoretical results showed that each of the four circular saw blades with unique body structures had different process parameters in an appropriate tensioning state. Circular saw blades with different body structures showed variation in improvements of their ability to withstand cutting temperature load after an appropriate tensioning process.

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He, Jia Yuan, Yan Wang i Nabil Gindy. "Pre-Tensioning Fixture Development for Machining of Thin-Walled Components". Advanced Materials Research 314-316 (sierpień 2011): 319–26. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.319.

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Pre-tensioning forces are, in essence, the application of selective clamping forces on components prior to machining to create a “stress field” envelope that aids the processes of components. Utilisation of pretension forces prior to process offers advantages of increasing component rigidity, thus reducing the deflection from process, and holding the components in a way to counteract the machining forces etc. However, the scientific research of pre-tensioning forces has not been extensively or comprehensively investigated. The aim of this paper is to investigate the impact of applying pre-tensioning forces on thin walled components, and more specifically, focuses on the development of appropriate fixtures to achieve optimal performance from pre-tensioning. Finite Element Analyses (FEA) were used intensively to analyse the impact of pre-tensioning forces on components during machining process considering machining deflections. After the FE models were validated from experiments, stiffness of components under the action of pre-tensioning forces can be predicted for the development of future fixture design

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Chen, Xiaowen, i Guanci Yang. "Data Sensing and Processing Tensioning System Based on the Internet of Things". Applied Sciences 9, nr 2 (16.01.2019): 310. http://dx.doi.org/10.3390/app9020310.

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Tensioning is an important process for producing prestressed concrete beams and directly affects bridge performance and driving safety. Active sensing and management of tensioning process data can improve the efficiency of quality monitoring and level of prestressed concrete beams. To realize remote collection and quality monitoring of tensioning process data, a framework for data sensing and processing of tensioning system based on the Internet of Things (IoT) is proposed in this study. Firstly, we investigate the technical framework and techniques of the system and designs a work flow of sensing, transport, and application service layers. The architecture of the tensioning system is presented. Then we propose a data acquisition and preprocessing method for the sensing layer, put forwards the data-pushing mechanism of the transport layer, and designs the function and work flow of the application service layer. After that, .NET platform and Android Studio are used to implement the tensioning system based on Browser/Server (B/S) architecture and mobile terminals. Finally, the case results of the system in seven precast beam fields in the Hubei section of Zhengzhou–Wanzhou high-speed Railway are given, which show that the developed system realizes collection, active pushing, and remote monitoring of tensioning process data.

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He, Yong Jun, Xu Hong Zhou i Jia Wei Zhou. "Calculation Method of the Initial Strains of Cables in Pretensioning Construction of Prestressed Space Reticulated Structures". Advanced Materials Research 250-253 (maj 2011): 2571–74. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.2571.

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It is a complicated process to adjust the tensile forces of cables to their target forces in the practical tensioning construction of prestressed space reticulated structure. In this paper a calculation method for whole-process analysis of the multi-stage and multi-batch tensioning construction is presented to improve the tensioning efficiency. By diminishing the difference between the actual tensile forces of the cables and their target values gradually, the initial strains of the cables for tensioning in construction can be obtained. All the cables can reach to their target values one time if they are stretched to the calculated initial strains in accordance with the predetermined tensioning sequence. The analysis on a prestressed spherical reticulated mega-structure with span of 150m is carried out; the results indicate that this method is feasible in practice.

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Zheng, Jianhao, Hailong Zhang i Jiawei Wang. "Innovation of Intelligent Tensioning in Precast Box Girder". E3S Web of Conferences 233 (2021): 01090. http://dx.doi.org/10.1051/e3sconf/202123301090.

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Because of the high precision and stability of the intelligent system, the intelligent tensioning technology can completely eliminate the interference of human factors and effectively ensure the construction quality of the prestressed tensioning. In this paper, the characteristics, principle, process flow and points for attention in the process of intelligent tensioning of precast box girder are introduced.

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Michalik, Peter, i Vieroslav Molnar. "The Monitoring and Analysis of Textile Conveyor Belt by Industrial Metrotomographs". Applied Mechanics and Materials 803 (październik 2015): 207–14. http://dx.doi.org/10.4028/www.scientific.net/amm.803.207.

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The article deals with a description of new test equipment and methodology of an analysis of textile rubber conveyor belts loaded by a tensile force. This construction is designed tensioning device, which allows the development of automatic tensioning force in one axis X-tensioning force F is exerted screw the nut with a torque wrench and a controlled strain-gauge sensor. Measured sample-textile conveyor belt is clamped in two adjustable clamping jaws ribbed belts for different thicknesses. Ribbed clamping jaws on one side of the tensioning device is attached to the frame and on the other hand are attached to the runner associated with the movable tensioning screw. Presented measurement method arises from existing norms. Sensing sample section of the conveyor belt is carried out on CMMs based CT for parts with different size and density of the material.

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Tan, Hongmei, Zhujian Hou, Zhou Qiu, Junlin Ji i Dahan Chen. "The USGT Method for Suspender Tensioning of Self-Anchored Suspension Bridges". Advances in Civil Engineering 2021 (24.05.2021): 1–10. http://dx.doi.org/10.1155/2021/6619924.

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Unlike earth-anchored suspension bridges, self-anchored suspension bridges (SASBs) involve a special construction stage, namely, suspender tensioning, in which the tensioning force and sequence are crucial and complicated. Against this background, an example bridge A, a SASB with a steel-concrete composite beam, is introduced in detail. Using MIDAS finite element software, a suspender tensioning scheme is formulated based on a combination method of the unstrained state method and graded tension method (the USGT method), in which a suspender is tensioned according to its unstrained length. By analyzing the bending moment change of the beam and deflection of the main cable throughout the entire construction process, a “high-to-low” suspender tensioning sequence is proposed that also involves symmetrical tensioning from the main towers to the midspan or the anchor positions. In the optimized construction process, the deviation and stress of the main towers are controlled well, thereby ensuring the safety of the main beam and main towers in the construction process.

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Tan, Xiao Dong, Pi Wei Song i Yang Li. "The Analysis of the Life of Conveyer-Belt on a Hydraulic Tensioning Device". Key Engineering Materials 621 (sierpień 2014): 282–87. http://dx.doi.org/10.4028/www.scientific.net/kem.621.282.

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This paper analyzes the life of a kind of conveyor belt, based on the theory of the hydraulic tensioning device. Hydraulic tensioning device is a kind of machine which detects the real-time force in the conveyor belt. When the force is lower than the enactment value, the device will tension the belt to make it lager, in case of the belt skids. When the force is higher than the enactment value, the device will stop tensioning the belt. Based on the relationship between the effective strain and the life of the conveyor belt, simplify the real problem. Draw a curve of the relationship between the effective strain and the life of the conveyor belt by Matlab which can educe the stop tensioning value. Based on the theory of classical mechanics, the paper gives out the start tensioning value. At last, this paper gives out the reasonable range of the strain of the conveyor belt.

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Chen, Deshen, Yan Zhang, Hongliang Qian, Huajie Wang i Xiaofei Jin. "NUMERICAL APPROACH FOR SIMULATING THE TENSIONING PROCESS OF COMPLEX PRESTRESSED CABLE-NET STRUCTURES". JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 27, nr 8 (8.11.2021): 571–78. http://dx.doi.org/10.3846/jcem.2021.15776.

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The stability of cable-net structures depends on the prestress of the system. Due to the large displacement and mutual effect of the cables, it is difficult to simulate the tensioning process and control the forming accuracy. The Backward Algorithm (BA) has been used to simulate the tensioning process. The traditional BA involves complicated and tedious matrix operations. In this paper, a new numerical method based on the Vector Form Intrinsic Finite Element (VFIFE) method is proposed for BA application. Moreover, the tensioning sequence of a complex cable-net structure is introduced. Subsequently, a new approach for BA application in the simulation of the tensioning process is presented, which combines the VFIFE approach and the notion of form-finding. Finally, a numerical example is simulated in detail and the results of different tensioning stages are analyzed to verify the feasibility of the proposed approach. This study provides a significant reference for improving the construction control and forming accuracy of complex prestressed cable-net structures.

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Pei, Yong-Chen, Jun-Heng Wang i Hang Zhang. "Investigation on bolt initial tensioning of inner-diameter saw blade". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, nr 8 (15.12.2019): 1609–29. http://dx.doi.org/10.1177/0954406219893724.

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Inner-diameter slicing based on a thin inner-diameter saw blade is one of the main hard and brittle material slicing methods. The inner-diameter saw blade needs to be tensioned for increasing its slicing stiffness and stability before working, and the tensioning quality affects the performance of subsequent material slicing directly and severely. In this paper, through finite element theoretical simulation and specialized experimental testing, the tensioning operation schemes are investigated systematically in the view of tensioning state and quality of the inner-diameter saw blade. By including mechanical equipment and electrical instruments, a specialized automatic experiment system is designed and manufactured with control and measurement function. Effects of bolts pre-tightening force, tightening sequence and rounds, and tensioning amount on the inner-diameter saw blade cutting-edge unevenness, lateral thrust stiffness, and transversal vibration response are investigated by theoretical simulation and experimental observation. A guideline on the optimization and improvement of initial tensioning is proposed for the inner-diameter saw blade practical engineering production.

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Bakht, Baidar, i Leslie G. Jaeger. "On the use of springs in stress-laminated wood decks". Canadian Journal of Civil Engineering 23, nr 4 (1.08.1996): 982–85. http://dx.doi.org/10.1139/l96-903.

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Transverse post-tensioning forces, essential for the structural integrity of stress-laminated wood decks, are subject to losses because of the time- and stress-dependent shrinkage of wood. Through physical testing conducted over the last 20 years, it has been found by a number of researchers that the prestress losses in these structures can be minimized by reducing the stiffness of the post-tensioning system and also by incorporating mechanical springs between the deck and the post-tensioning system. From this observation, it has been generally concluded by the investigators that the incorporation of springs in stress-laminated wood decks is equivalent to reducing the stiffness of the post-tensioning system. In this note, it is argued that this assumed equivalence is not true, but that the springs are nevertheless effective in reducing prestress losses in stress-laminated wood decks. Key words: post-tensioning, prestress losses, stress-laminated wood deck, wood bridge, wood deck.

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Mao, Guang Feng, Guo Hua Cao, Ji Song Pan i Bei Bei Fu. "Design and Optimization on the Steel Rope Automatic Tensioning Device of Mine Elevator". Applied Mechanics and Materials 532 (luty 2014): 443–46. http://dx.doi.org/10.4028/www.scientific.net/amm.532.443.

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In this paper, one Automatic Tensioning Device which can realize multi-time tensioning is designed. Through structural designing and motion designing to get the main structure, through initially calculating to get its each part parameters, through ANSYS optimization designing to get its minimum size parameters of each device under the strength conditions, to achieve its goal to optimize the quality of the lightest. Main components of Automatic Tensioning Device are selected as the research object, establishing the optimal equation, using the optimization module of Goal Driven Optimization of ANSYS to optimize its size. The results show that with the strength requirement contented, Automatic Tensioning Device can be optimized by optimizing the Wall Panel.

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Li, Zi Qi, Yan Yan Fan, Jia Feng Bai i Yan Li. "Research on Simulation and Analysis of Tensioning Process of Suspender for Combinative Bridge with V-Type Pier Continuous Rigid Frame and Arch". Applied Mechanics and Materials 587-589 (lipiec 2014): 1448–53. http://dx.doi.org/10.4028/www.scientific.net/amm.587-589.1448.

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The combinative bridge with V-type rigid frame continuous concrete beams and concrete filled steel arch bridge is a hyperstatic structure at internal and external, the construction process is complex, the structure is occurring system transformation with construction process. The tensioning process of hangers has a direct impact on the force of suspender final bridge and the stress state of the structure. The influence of deformation and stress of structure are studied with one-step tensioning and multi-step tensioning, Based on finite element simulation of construction process for the combinative structure with V-type rigid frame and arch of Nianchu River Bridge. The tensioning construction process of suspenders is forward on considering the actual situation of the bridge.

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VACHTSEVANOS, JOHN G., KEITH A. LAMBERSON i LONNIE E. PAULOS. "Anterior Cruciate Graft Tensioning". Techniques in Knee Surgery 2, nr 2 (czerwiec 2003): 125–36. http://dx.doi.org/10.1097/00132588-200306000-00008.

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Tao, Matthew A., Jacob G. Calcei i Samuel A. Taylor. "Biceps Tenodesis: Anatomic Tensioning". Arthroscopy Techniques 6, nr 4 (sierpień 2017): e1125-e1129. http://dx.doi.org/10.1016/j.eats.2017.03.033.

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Piedade, Sérgio Rocha, Inácio Maria Dal Fabbro, Martha Maria Mischan, Cezar Piedade i Nicola Maffulli. "Static tensioning promotes hamstring tendons force relaxation more reliably than cycling tensioning". Knee 24, nr 4 (sierpień 2017): 775–81. http://dx.doi.org/10.1016/j.knee.2017.04.017.

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Goncharov, K. A. "Conceptual solutions for control systems of differential tensioners for belt conveyors". Nauchno-tekhnicheskiy vestnik Bryanskogo gosudarstvennogo universiteta 7, nr 4 (25.12.2021): 316–27. http://dx.doi.org/10.22281/2413-9920-2021-07-04-316-327.

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Differential tensioning devices for belt conveyors in general and intermediate drives of extended conveyors in the form of closed traction loops are a new type of automatic tensioning devices that differ from other known designs by the presence of a stepwise discrete belt tension control system with separation of compensation functions for belt stretching under load and control of its tension during the operation of the conveyor in order to create optimal modes of belt loading. The article analyzes the well-known and practical concepts of belt conveyor control systems in general. The possibility of controlling the traction force realized by the intermediate belt drive by controlling the tension of the traction and load-carrying belts is shown. On the basis of the analysis, conceptual solutions for control systems for differential tensioning devices of belt conveyors are proposed with the possibility of both autonomous use and application in the structure of an integrated conveyor control system. Possible structures of linear parts of differential tensioning devices are presented, as well as options for the implementation of executive parts that directly move tensioning elements.

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30

Kim, J. W., J. H. Doh i S. Fragomeni. "Experimental and Numerical Study for the Shaping Formation of SCST Structures by Cable-tensioning". Open Civil Engineering Journal 7, nr 1 (12.07.2013): 77–83. http://dx.doi.org/10.2174/1874149501307010077.

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This paper discusses the behaviour characteristics of the shaping formation of Single-Chorded Space Truss (SCST) structures by means of cable-tensioning of bottom chords. The innovative technique is fast and economical and issued in many types of space structures. The small-scale test models presented herein consist of uniform pyramids with multi-directional ball type joints which are erected into their final shape by cable-tensioning. Since the joint behaviour is very significant in studying the shaping of SCST structures, basic tests for beam and pyramidal units were performed. The feasibility of the proposed cable-tensioning technique and the reliability of the established geometric model were confirmed by finite element analysis. The proposed cable-tensioning technique indicates that the behaviour characteristic of joints is very important in the shaping formation of SCST structures. More specifically in situations where heavy cranes are inaccessible, the cable-tensioning construction technique has proven to be an easy and reasonable method compared to conventional construction methods that typically include heavy cranes and scaffolding.

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Richards, David G., Philip B. Prangnell, Philip J. Withers, Stewart W. Williams, Andrew Wescott i E. C. Oliver. "Geometry Effects when Controlling Residual Stresses in Friction Stir Welds by Mechanical Tensioning". Materials Science Forum 524-525 (wrzesień 2006): 71–76. http://dx.doi.org/10.4028/www.scientific.net/msf.524-525.71.

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Finite element modelling has proved to be an effective tool for the investigation of trends effected by changing welding conditions. This is especially important in mechanical tensioning of friction stir welds because of the large number of parameters involved. In this paper, an FE model is used to examine the effectiveness of the mechanical tensioning technique for controlling residual stresses in FSWs by the investigation of trends caused by changes to the welding parameters. Comparisons between different geometries, traverse speeds, and welding off-axis angle all produced consistent results, and showed that the peak stresses are most strongly influenced by both the local tensioning and heat input, and not by the more global welding conditions. The results also showed a progressive decrease in the residual stresses for increasing tensioning levels and, although affected by the heat input, a relatively low sensitivity to the welding variables. At tensioning levels greater than ~50% of the room temperature yield stress, tensile stresses were replaced by compressive residual stresses within the weld.

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32

Sayed-Ahmed, Ezzeldin Y., i Nigel G. Shrive. "A new steel anchorage system for post-tensioning applications using carbon fibre reinforced plastic tendons". Canadian Journal of Civil Engineering 25, nr 1 (1.01.1998): 113–27. http://dx.doi.org/10.1139/l97-054.

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During the past half century, the use of prestressing in different structures has increased tremendously. One of the most important techniques of prestressing is post-tensioning. The main problem associated with post-tensioning in different structures is the corrosion of the prestressing steel tendons even with well-protected steel. New materials, fibre reinforced plastics or polymers (FRP), which are more durable than steel, can be used for these tendons/strands and thus overcome the corrosion problem. However, different shortcomings appear when FRP tendons are introduced to post-tensioning prestressing applications. For carbon fibre plastic tendons (CFRP), there is no suitable anchorage system for post-tensioning applications. Some of the anchorages developed by others for use with FRPs are therefore described and assessed. A new anchorage system developed by the authors, which can be used with bonded or unbonded CFRP tendons in post-tensioning applications, is described. The results of direct tension and fatigue tests on CFRPs anchored with the new system are presented.Key words: anchorage system, cyclic loading, fatigue, fibre reinforced plastics, finite element analysis, post-tension, prestressed concrete, prestressed masonry, strands, tendons.

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Heisel, Uwe, Thomas Stehle i Hadi Ghassemi. "A Simulation Model for Analysis of Roll Tensioning of Circular Saw Blade". Advanced Materials Research 1018 (wrzesień 2014): 57–66. http://dx.doi.org/10.4028/www.scientific.net/amr.1018.57.

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Circular saw blades are very widespread in wood machining. They are used in different batches and sizes and in large quantities from hand tools to large machining centers. Because of this huge range of applications the circular saws have gained great importance in the industry. The rising request to improve the cutting quality, reduce the noise emission and increase the life time requires improvement measures for the dynamic behavior of the circular saw blade. The roll tensioning of the circular saw blade has been empirically established as an elegant solution to improve the static and dynamic properties of the circular saw blade. However, there are several influencing parameters for this process that have not yet been studied scientifically accurate. A scientific and economical solution for the study of various roll tensioning parameters is a simulation model based on finite elements method (FEM) that analyzes the effects on the dynamic behavior of circular saw blade. In this work, a simulation model for roll tensioning of circular saw blades is presented. With this simulation model, the residual stresses induced by the roll tensioning can be calculated. This is very relevant for the changing of dynamic properties of the circular saw blade, such as the shifting of eigenvalues and reduction of side run out. Furthermore, this simulation model allows the investigation of various roll tensioning parameters. This investigation helps to gain a better understanding of the relationship between roll tensioning and improvement of dynamic behavior of circular saw blades. Furthermore, it helps to find the optimization potential of the roll tensioning process which is one of the most important parts of the production line of circular saw blades.

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34

Srilaxmi, Veerat, K. Manju i M. Vijaya. "A CASE STUDY ON PRE-TENSIONING & POST TENSIONING SYSTEMS OF A PRESTRESSED CONCRETE". International Journal of Engineering Technologies and Management Research 5, nr 2 (10.02.2020): 249–54. http://dx.doi.org/10.29121/ijetmr.v5.i2.2018.169.

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In Present days the pretensioning and post tensioning systems are very popularly using in the major constructions of a structure. The Pre-tensioning and Post-tensioning both methods are used under pre-stressing process. In which has few edges over the orthodox non-stressed structures like greater span to depth ratio, higher moment and shear capacity. These methods are generally adopted in the making of PSC girders, sleepers, Bridges, Slabs in buildings, Concrete Pile, Repair and Rehabilitations, Nuclear Power Plant etc.

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35

An, Yuan, i Bo Li. "Research on residual stress field control mechanism of circular saw blade considering its body structure". Advances in Mechanical Engineering 13, nr 5 (maj 2021): 168781402110162. http://dx.doi.org/10.1177/16878140211016213.

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In this paper, 3D roll tensioning elastoplastic model was built by finite element method and the research object was a common circular saw blade body with hole, slot, and scraper structure. The theoretical calculation results show that there are areas dominated by tangential compressive stress near slot and scraper of roll tensioned saw blade body, which is not the expected result. It is proved that residual stress of saw blade body can be regulated by combining roll tensioning and local plastic compression process in this paper. The theoretical calculation results show that the outer edge of saw blade body near slot and scraper becomes area dominated by tangential tensile stress after the improved tensioning process. The improved tensioning process has little effect on stiffness and waist strength of circular saw blade.

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36

Xu, Jun, i Wei Li. "The Nonlinear Time-Varying Response of Dynamic Thermal Tensioning for Welding-Induced Distortion Control". Journal of Manufacturing Science and Engineering 129, nr 2 (6.10.2006): 333–41. http://dx.doi.org/10.1115/1.2540708.

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This paper presents a dynamic thermal tensioning method to control the welding induced distortion under production variation. The new method determines the optimal thermal tensioning parameters based on real-time distortion measurements. The paper is focused on a systematic study on the structural response and the development of an automatic control algorithm for the dynamic thermal tensioning process. A thermomechanical finite element model was used to study preheating effects in a gas metal arc welding process. A model predictive strategy was adopted for automatic distortion control. It has been found that the response of the dynamic thermal tensioning process is nonlinear and time varying. However, the response model can be linearized based on the superposition principle. A threshold-based control algorithm is developed and demonstrated using both simulation and experimental results.

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37

King, G. J. W., E. L. Damson, C. B. Frank i N. G. Shrive. "A New Device and Method for Controlling the Load in Rabbit Medial Collateral Ligament Reconstructions". Journal of Biomechanical Engineering 117, nr 1 (1.02.1995): 41–47. http://dx.doi.org/10.1115/1.2792268.

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In order to study the effect of intra-operative tensioning on the laxity and strength of healing ligament grafts in an animal model, a method of quantifying graft tension was needed. In this study a sensitive ligament tensioning device was developed to measure accurately the prefixation loads in the rabbit medial collateral ligament (MCL) graft. To verify that reproducible changes in ligament tension could be created with the tensioning device, a group of animals had their MCL grafts replaced at one of three different graft loads (tight, anatomic, or loose). The tensioning device consists of two posts which move relative to one another by means of an axial screw. The movable post, which is inserted into the tibial bone island of the MCL graft has a series of strain gauges which can measure the tension applied to the graft. The stationary post attaches to the tibial shaft, permitting the ligament graft to be tensioned relative to this fixed point. After graft tensioning and fixation, the animals were euthanized immediately postoperatively and their ligament load-deformation behavior was measured using an Instron materials testing machine. Specific measures of low load behavior was taken to quantify ligament laxity. Our results demonstrate that the tensioning device was capable of reproducibly altering prefixation graft load intra-operatively as well as MCL laxity immediately postoperatively. A baseline of laxity values was thus developed to follow changes in this laxity measure for future studies of MCL graft healing in this model.

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Smith, G. H., J. S. Huntley, R. E. Anakwe, R. J. Wallace i J. E. McEachan. "Tensioning of Prolene reduces creep under cyclical load: relevance to a simple pre-operative manoeuvre". Journal of Hand Surgery (European Volume) 37, nr 9 (24.11.2011): 823–25. http://dx.doi.org/10.1177/1753193411427663.

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A longitudinal stretch or ‘pre-tensioning’ is a method employed by some surgeons to improve the handling characteristics of a suture. We used a tensile tester to assess the effect of pre-tensioning on the mechanical properties of two suture materials (3-0 Prolene and 3-0 Ethibond) commonly used for flexor tendon repair. A cyclical loading programme was used to simulate an early rehabilitation regime. All sutures were subsequently tested to failure (for ultimate tensile strength). The pre-tensioned Prolene sutures showed significantly less creep after cyclical loading in comparison to controls. Conversely pre-tensioning had no measurable effect on the deformation of Ethibond by creep. There was no effect on ultimate tensile strength for either material. The propensity of Prolene to creep (and thereby form a ‘gap’ in tendon repairs) can be reduced by pre-tensioning.

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39

Xing, Jun, i Zhi Xin Fan. "Study on the Relationship between Ergometer and Tensioning Force of Pre-Stressed Pier Anchor Cable". Applied Mechanics and Materials 353-356 (sierpień 2013): 2822–26. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.2822.

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During the construction of pre-stressed anchor cables for discharging flood and sand in the lower reservoir of Pushihe Pumped-storage Power Station, the tensioning of main and secondary cables are overall carried out according to design, in which the tensioning force is divided into seventh grades, the indicator values of ergometer and tensioning force of jack were obtained by experiment, and the difference between them were compared and analysis, the results of experiment provides the basis for the long-term and stable operation of pre-stressed pier in Pushihe project.

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40

Li, Bo, i Zhankuan Zhang. "Tensioning effect modeling of circular saw blade after multi-spot pressure tensioning process". Advances in Mechanical Engineering 9, nr 12 (grudzień 2017): 168781401774047. http://dx.doi.org/10.1177/1687814017740476.

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Di Cesare, Antonio, Felice Carlo Ponzo, Nicla Lamarucciola i Domenico Nigro. "Experimental seismic response of a resilient 3-storey post-tensioned timber framed building with dissipative braces". Bulletin of Earthquake Engineering 18, nr 15 (6.10.2020): 6825–48. http://dx.doi.org/10.1007/s10518-020-00969-y.

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Abstract With the increased number of multi-storey buildings in seismic areas, research efforts have been focused on developing earthquake resilient systems, such as low-damage techniques based on the combination of post-tensioning and dissipating devices. This paper describes the experimental study performed on a 3-storey post-tensioned timber framed (Pres-Lam) building equipped with energy dissipating systems. The testing project consisted of three phases adopting different configurations of the experimental model: (1) post-tensioning to beam-column joints only, (2) post-tensioning and dissipative rocking mechanisms and (3) post-tensioning and dissipative braces. The main objective of this paper is to experimentally investigate on the seismic response of a large-scale specimen with dissipative braces located in high seismic area, considering construction details similar to those adopted in practical applications. During the experimental campaign, the test frame was subjected to more than one hundred ground motions considering a set of seven spectra-compatible earthquakes at increasing intensity levels. The dissipating bracing system with external replaceable hysteretic dampers improves the seismic resilience of multi-storey Pres-Lam buildings, showing inter-storey drift comparable to those with rocking walls, with full recentring capability and without structural damages or post-tensioning losses through seismic tests.

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Chou, Chung-Che, i Ying-Chuan Chen. "Development of Steel Dual-Core Self-Centering Braces: Quasi-Static Cyclic Tests and Finite Element Analyses". Earthquake Spectra 31, nr 1 (luty 2015): 247–72. http://dx.doi.org/10.1193/082712eqs272m.

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This work presents mechanics, tests, and finite element analyses of a novel steel dual-core self-centering brace (SCB) with flag-shaped re-centering responses. The axial deformation capacity of the brace is doubled with respect to the SCED brace by serial deformations of two sets of parallel tensioning elements when both braces use the same tensioning elements. The mechanics of the brace is first explained; six tensioning elements and four dual-core SCBs are tested to evaluate their cyclic performance. The braces exhibit excellent performance up to a drift of 2% with a maximum axial force around 1,400 kN. The braces also survive 15 low-cycle fatigue tests at a drift of 1.5%. Tensioning elements fail when the braces are overloaded to 2.5–3% drift. Finite element analysis is conducted to further verify hysteretic responses of the dual-core SCB in cyclic tests. A design procedure for the proposed dual-core SCB is also included in the paper.

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43

Han, Kyoung-Bong, i Sun-Kyu Park. "Parametric study of truss bridges by the post-tensioning method". Canadian Journal of Civil Engineering 32, nr 2 (1.04.2005): 420–29. http://dx.doi.org/10.1139/l04-096.

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The post-tensioning method has been successfully used to improve the performance of existing concrete structures. Applications of the method are rare in steel structures, however. Post-tensioning using high-strength cables or bars can be effectively used to increase the working load carrying capacity of steel structures. In this paper, the elastic behavior of post-tensioned trusses with straight and draped tendon profiles for truss strengthening is examined. The effects of design parameters such as the tendon profile, truss type, prestressing force, and tendon eccentricity on working load and deflection of trusses are studied. The results show that the allowable load of a truss increases proportionally with the increase in prestressing force and eccentricity. Post-tensioning enlarges the elastic range, increases the redundancy, and reduces the deflection and member stresses, eventually increasing the load-carrying capacity of truss bridges.Key words: post-tensioning method, steel structures, post-tensioned trusses, truss strengthening, design parameters, load-carrying capacity.

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Richards, David G., Philip B. Prangnell, Philip J. Withers, Stewart W. Williams, Andrew Wescott i E. C. Oliver. "FE Modelling of Mechanical Tensioning for Controlling Residual Stresses in Friction Stir Welds". Materials Science Forum 539-543 (marzec 2007): 4025–30. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.4025.

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Although Friction Stir Welding (FSW) avoids many of the problems encountered when fusion welding high strength Al-alloys, it can still result in substantial residual stresses that have a detrimental impact on service life. An FE model has been developed to investigate the effectives of the mechanical tensioning technique for controlling residual stresses in FSWs. The model purely considered the heat input and the mechanical effects of the tool were ignored. Variables, such as tensioning level, heat input, and plate geometry, have been studied. Good general agreement was found between modelling results and residual stress measurements, justifying the assumption that the stress development is dominated by the thermal field. The results showed a progressive decrease in the residual stresses for increasing tensioning levels and, although affected by the heat input, a relatively low sensitivity to the welding variables. At tensioning levels greater than ~ 50% of the room temperature yield stress, tensile were replaced by compressive residual stresses within the weld.

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Li, Zihan, Qilin Zhao i Yonglong Zhu. "Experimental Study on Prestressed CFRP-reinforced Aluminum Alloy Bridge Panel Based on Shape Memory Alloys". Advances in Engineering Technology Research 1, nr 3 (9.02.2023): 720. http://dx.doi.org/10.56028/aetr.3.1.720.

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In order to strengthen aluminum alloy bridge panels, a CFRP (Carbon Fibre Reinforced Plastics) plate is tensioned under the bottom plate to exert prestress. Installing the tensioning device under narrow bottom plates of bridge panels via traditional prestressing method is difficult; therefore, a new prestress tensioning technology based on Shape Memory Alloy (SMA) is employed to efficiently apply the prestress. The tensioning and anchorage device used in prestressing technology has been designed and manufactured. A tensile stress of 360Mpa was applied to the CFRP plate with the tensioning and anchorage device and then, load-bearing tests were performed on prestressed reinforced aluminum alloy and unreinforced bridge panels, respectively. Experimental results showed that the proposed CFRP prestressing technology was feasible and verified the application possibility of SMA as a prestress device in practical engineering. The new technology ensured that the desired prestress value was applied to aluminum alloy bridge panel and the strength and stiffness of aluminum alloy bridge panels reinforced with the proposed technology were significantly improved.

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46

Hu, Chun Hua, Yong Jun Xia i Wen Ming Mei. "Research on Project Test Tensioning of 1250mm² Large-Section Conductor". Advanced Materials Research 1070-1072 (grudzień 2014): 1123–26. http://dx.doi.org/10.4028/www.scientific.net/amr.1070-1072.1123.

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The paper introduces project test tensioning of 1250mm2 large-section conductor and validate structural stability and tensioning characteristics of newly developed 1250mm2 large-section aluminum stranded conductor, reasonability of construction processes and critical construction parameters and applicability of newly developed construction machines and tools to the conductor.

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47

Kulinowski, Piotr. "SIMULATION METHOD OF DESIGNING AND SELECTING TENSIONING SYSTEMS FOR MINING BELT CONVEYORS". Archives of Mining Sciences 59, nr 1 (1.03.2014): 123–38. http://dx.doi.org/10.2478/amsc-2014-0009.

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Abstract This article deals with a methodology developed to design and select tensioning systems with using simulation studies on a belt conveyor model. It describes the structure of a dynamic model of a belt conveyor with distributed parameters and details of physical models of the applied belt tensioning systems. For proper display and comparison of work described tensioning systems are shown examples of the results of simulations carried out on a discrete model of the mining belt conveyor. Presented methodology has been verified through industrial research and realization of a number of complex projects requiring simulation tests of take-up systems of belt conveyors.

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Ferreira, Jessica, André Bebiano, Daniel Raro, João Martins i Anabela G. Silva. "Comparative Effects of Tensioning and Sliding Neural Mobilization on Static Postural Control and Lower Limb Hop Testing in Football Players". Journal of Sport Rehabilitation 28, nr 8 (1.11.2019): 840–46. http://dx.doi.org/10.1123/jsr.2017-0374.

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Context: Sliding and tensioning neural mobilization are used to restore normal function of the nervous system, but they impose different stresses on it. Particularly, sliding induces greater nerve excursion than tensioning. Conceivably, they might impact nervous system function differently. Objective: To compare the effects of tensioning neural mobilization versus sliding neural mobilization of the dominant lower limb on static postural control and hop testing. Design: Randomized, parallel and double blinded trial. Setting/Participants: Thirty-seven football players. Intervention(s): Participants were randomized into 2 groups: sliding neural mobilization (n = 18) or tensioning neural mobilization (n = 19) targeting the tibial nerve. Main Outcome Measures: Static postural sway was assessed with a force plate and functional performance with hop tests. Measurements were taken at baseline, after the intervention, and at 30-minute follow-up. Results: There was a significant effect of time for the center of pressure total displacement and velocity (P < .05), for the single-leg hop test (P < .05), the 6-m timed hop test (P < .05), and the cross-over hop test (P < .05), but no significant effect of the intervention. Conclusions: Sliding and tensioning neural mobilization improved postural control and hop testing in football players, and improvements remained 30 minutes after the intervention. Additional research examining the influence of neural mobilization on sensory motor impairments, postural control, and functional performance is needed.

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Rixon, Gordon. "Re-tensioning Lonergan's Hermeneutical Scissors". Ultimate Reality and Meaning 30, nr 2 (czerwiec 2007): 156–64. http://dx.doi.org/10.3138/uram.30.2.156.

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Emmerich, David Georges. "Emmerich On Self-Tensioning Structures". International Journal of Space Structures 11, nr 1-2 (kwiecień 1996): 29–36. http://dx.doi.org/10.1177/026635119601-205.

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