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Статті в журналах з теми "Hydrostatic locking"
Zhang, Penghai, and Yaolong Chen. "Analysis of error motions of axial locking-prevention hydrostatic spindle." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 1 (April 6, 2018): 3–17. http://dx.doi.org/10.1177/1350650118769769.
Повний текст джерелаYun, Feihong, Gang Wang, Zheping Yan, Peng Jia, Xiujun Xu, Liquan Wang, Haiting Sun, and Weifeng Liu. "Analysis of Sealing and Leakage Performance of the Subsea Collet Connector with Lens-Type Sealing Structure." Journal of Marine Science and Engineering 8, no. 6 (June 17, 2020): 444. http://dx.doi.org/10.3390/jmse8060444.
Повний текст джерелаRafferty, Aidan, Kyle Gorkowski, Andreas Zuend, and Thomas C. Preston. "Optical deformation of single aerosol particles." Proceedings of the National Academy of Sciences 116, no. 40 (September 16, 2019): 19880–86. http://dx.doi.org/10.1073/pnas.1907687116.
Повний текст джерелаOnishi, Yuki. "A Concept of Cell-Based Smoothed Finite Element Method Using 10-Node Tetrahedral Elements (CS-FEM-T10) for Large Deformation Problems of Nearly Incompressible Solids." International Journal of Computational Methods 17, no. 02 (October 24, 2019): 1845009. http://dx.doi.org/10.1142/s0219876218450093.
Повний текст джерелаKOLOMYTSEV, V., V. NEVDACHA, L. BATAILLARD, and R. GOTTHARDT. "CRITICAL EXPONENTS OF THE TRANSPORT PROPERTIES AT THE B2⇔IC⇔C(R) TRANSITIONS IN Ti-Ni-Me SHAPE MEMORY ALLOYS." International Journal of Modern Physics B 14, no. 17 (July 10, 2000): 1729–42. http://dx.doi.org/10.1142/s021797920000159x.
Повний текст джерелаBelsare, Rohit S., Avinash Badadhe, and Subim Khan. "Self-Locking Hydrostatic Differential for Automated Agriculture Spray Vehicle." International Journal of Engineering Sciences 14, no. 1 (2021). http://dx.doi.org/10.36224/ijes.140103.
Повний текст джерелаPRODAN, DAN, ANCA BUCURESTEANU, and EMILIA BALAN. "HYDRAULIC INSTALLATIONS FOR HEAVY MACHINE-TOOLS." Journal of Engineering Studies and Research 18, no. 2 (March 13, 2017). http://dx.doi.org/10.29081/jesr.v18i2.227.
Повний текст джерелаSchönherr, Josef Arthur, Patrick Schneider, and Christian Mittelstedt. "Robust hybrid/mixed finite elements for rubber-like materials under severe compression." Computational Mechanics, March 31, 2022. http://dx.doi.org/10.1007/s00466-022-02157-y.
Повний текст джерелаДисертації з теми "Hydrostatic locking"
Мормило, Яков Михайлович. "Підвищення рухливості військових колісних машин шляхом застосування міжколісних диференціалів з гідростатичним блокуванням без фрикційних дисків". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2020. http://repository.kpi.kharkov.ua/handle/KhPI-Press/46109.
Повний текст джерелаThesis for a PhD Degree in Technical science: Specialty 255 – Armament and military equipment (25 – Military sciences, national security, state border security). – National Technical University “Kharkiv Polytechnic Institute”, the Ministry of Education and Science of Ukraine, Kharkiv, 2020. Relevance of the topic. The need for inter-wheel differentials (IWD) arose immediately after the appearance of the first two-wheel drive cars. Most notably, this need was manifested during turning and driving on rough roads. The absence of IWD in such transmissions caused power circulation, unreasonably large additional loads on the drive axle and wheels, increased fuel consumption and high tire wear. With the invention of the traditional symmetric bevel gear IWD, these problems were solved. However, there were other problems associated with the phenomenon of slipping in difficult road conditions. Naturally, this challenge has found a large number of technical solutions that somehow smoothed out the problem, but did not solve it comprehensively. In recent decades, design solutions have emerged in which the differential lock is controlled electronically by a given algorithm, as well as drives in which the traction control system directly controls the input torque of the drive wheel. These solutions are especially effective for electric or hydrostatic motor wheels. However, despite the abundance of technical solutions in the field of differential wheel drive, there is no effective IWD design for military wheeled and multi-purpose full-wheel drive vehicles. The existing designs either still use complete manual lock, or are based on SLLSD that are not able to provide high cross-country ability and good handling at the same time. Therefore, despite the rapid development of electronic control systems and individual electric drives, the development of an efficient, internally automated IWD is topical for military wheeled and multi-purpose full-wheel drive vehicles. The aim of the dissertation is to increase the traction dynamics of wheeled armored personnel carriers and multi-purpose full-wheel drive vehicles in difficult road conditions with high rates of economy and controllability by developing and using IWD with hydrostatic locking based on a gear pump. To achieve this aim it is necessary to solve the following tasks: – to study the influence of the structure and parameters of IWD on the dynamics of acceleration of the car in difficult road conditions using methods of numerical simulation; – to study the influence of the structure and parameters of IWD on the resistance to curvilinear motion and controllability using numerical simulation methods; – to evaluate theoretically and experimentally the possibility of implementing hydrostatic blocking without additional friction disks for the IWD of the BTR-4 armored personnel carrier and determine its necessary technical parameters; – to evaluate experimentally the characteristics of the standard cam IWD of the BTR-4 armored personnel carrier with the full hanging of one of the wheels; – determine the parameters of the IWD with hydrostatic blocking and conduct a study of the selected mobility parameters of the armored personnel carrier BTR-4, equipped with the proposed IWD, using numerical simulation. The scientific novelty of the results. The main scientific results that are submitted to the public defense are: – for the first time, the possibility of creating an IWD with hydrostatic locking without additional friction disks based on a gear pump for a wheeled armored personnel carrier has been scientifically substantiated; – for the first time, an energy method has been proposed for assessing the efficiency of IWD, which, unlike the existing ones, is based on losses not with constant movement, but when the vehicles is accelerated in difficult road conditions to a given speed; – for the first time, a method is proposed for assessing the influence of the structure and parameters of IWD on the resistance to curvilinear movement on paved roads, which, in contrast to existing methods, is based not only on the assessment of losses in the IWD during curvilinear movement, but also on losses due to wheel slippage along the road and an increase in the actual radius turning due to the deviation of the wheels rolling direction and their slipping; – The dependence of the locking moment on the slipping speed for a two-row cam IWD of the BTR-4 armored personnel carrier was experimentally obtained. The practical significance of the results. The studies made it possible to calculate the parameters of the gear pump for hydrostatic locking of the IWD, which, with minor changes, is mounting in the main gear housing of the BTR-4 armored personnel carrier and is able to replace the purchased Russian unit with the worst performance characteristics. The developed methods for evaluating the effectiveness of differentials in straight-ahead acceleration in difficult road conditions and in curved motion on paved roads provide the opportunity to carry out structural-parametric synthesis of not only IWD, but also center differential for military vehicles and multi-purpose full-wheel drive vehicles with mechanical transmission. The practical significance of the dissertation research results is confirmed by acts on the implementation of the proposed methods for evaluating the effectiveness of IWD in the design practice in the State enterprise “Kharkov Machine Building Design Bureau named after A.A. Morozov” and LLC “Mashhydroprivod”. An act was also received on the introduction of methods for evaluating the effectiveness of IWD into the educational process of the NTU “KhPI” when preparing students for specialty 133 – Sectoral Engineering, specializations 133.02 – Automated design of cross-country vehicles. Conclusions on the work: 1) From the analysis of literary sources, it was concluded that there is no technical solution in the field of IWD that would ensure high crossability (including with full hanging of the drive wheels), do not impair handling, have internal automatism, was quite simple and cheap to manufacture and reliable in operation. 2) For wheeled vehicles, the operation of which allows the possibility of hanging one or several wheels when moving, in the IWD, to ensure patency, it is necessary to use either full blocking, or anti-slip systems based on ABS, or self-locking differentials with a blocking moment depending on the difference or square of the difference in the frequency of relative rotation axle shafts and differential housings. The use of complete locking in existing structures requires either a complete stop of the machine before locking (unlocking) differentials or the use of friction discs, the locking of which requires additional power take-off to keep them closed and which, when the machine is actively used in difficult road conditions, wear out intensively. Unfortunately, for the use of traction control systems based on ABS, we do not have well-tested domestic ABS systems that could form the basis for the creation of a traction control system in conditions of military use. Therefore, it is advisable to use IWD with hydrostatic locking without the use of additional friction discs. 3) From the above analysis it follows that the most effective input parameter for most approaches to ensure automatic power distribution between the wheels is the kinematic inconsistency of the rotational speeds of the drive wheels and the position of the steered wheels. 4) When analyzing the patency of wheeled vehicles that allow the possibility of hanging one or several wheels when moving, it is necessary to operate with the concept of the differential locking moment, and not the blocking coefficient. 5) As a result of mathematical modeling and calculations using the BTR-4 armored personnel carrier as an example, the values of the maximum relative rotational speed of the half-axle and the IWD housing were obtained, which can occur due to the difference in the rotational speeds of the wheels of different sides when maneuvering on paved roads. Also obtained are the dependences of the blocking moment of the IWD, necessary to ensure high crossability, on the frequency of the relative rotation of the axle shaft and the housing of the IWD. It was found that the optimum blocking moment should increase from zero to a maximum value of 3000 Nm, respectively, with an increase in the relative rotational speed of the half-axle and differential housing from 80 to 115 min-1. 6) Of the considered constructions of IWD on the dynamics of acceleration in difficult road conditions for average values of the proportionality coefficients, IWD have an advantage in which the degree of blocking depends on the load. 7) With the selected proportionality coefficients of the system for small steering angles (up to 8) in the first three quarters of the safe speed range and in terms of turning resistance and increasing turning radius, IWDs have an advantage, in which the degree of blocking depends on the square of the difference in speed of the half-axles. 8) The IWD, in which the degree of blocking depends on the square of the difference of the speeds of the axle shafts, also have an advantage for large steering angles of the steered wheels in the first half of the safe speed range. But at speeds close to turning over, they are behind from IWD, in which the degree of blocking depends on the load, for any angle of rotation of the steered wheels. 9) The IWD with a traction control system based on ABS are most suitable for use with relatively small values of the imbalance of adhesion coefficients on the sides of the car and integrate them with directional stability systems that allow you to easily change the value of the proportionality coefficients (system setting) depending on the situation. 10) For off-road vehicles, the operation of which does not imply modes with full hanging of the drive wheels, it is possible to use IWD effectively, in which the degree of blocking depends on the load. 11) For off-road vehicles and military wheeled vehicles, during operation of which full hanging of the drive wheels is possible, it is advisable to use an IWD with a locking moment, which depends on the square of the difference in the speeds of rotation of the axle shafts. They can have high energy performance during acceleration with minimal negative impact on the controllability of the machine and at the same time rely not on electronic control systems, but on their own internal automation. 12) The tests showed that the traction force of the drive axle with a double-row cam differential when one of the wheels (right) is fully hung out substantially depends on the speed of the slipping wheel. It reaches a maximum value of 1091 N at a rotational speed of a slip wheel of 399 rpm. This speed corresponds to the rotation of the input flange of the drive axle for the movement of the armored personnel carrier at a speed of 11 m / s (39.6 km / h), after which the differential is jammed. 13) The obtained values for the traction force of the drive axle with a double-row cam differential with full hanging of one of the wheels (right) are insufficient for the armored personnel carrier to overcome obstacles of the “ravine” type or “dune” type with diagonal hanging and obstacles of the “moat” type with sequential suspension of bridges. 14) Based on a gear pump with internal gearing, it is possible to realize a IWD with hydrostatic locking without the use of additional friction disks. This differential has a quadratic dependence of the locking (braking) moment on the difference in the angular velocities of the half-axle and the differential housing. This allows, on the one hand, to obtain almost complete differential blocking during slipping and, on the other hand, to provide minimal turning resistance when maneuvering on paved roads. 15) For the BTR-4 armored personnel carrier, the working volume of the gear pump with internal gearing, which allows maximum grip on the road when locking on a non-skid wheel, is 415 cm3. Such a pump is successfully assembled in the dimensions of the standard main gear (final drive) when replacing the existing cam differential with a classic open differential with bevel gears. 16) The optimum design diameter of the droselling hole is 2 mm. However, depending on the accuracy of manufacture of the gear pump elements and the total volume losses, this value should be experimentally adjusted downward. 17) Cycloidal gear gerotor pumps have been discontinued due to the difficulty of realizing high pressure in them due to the low coefficient of overlap of tooth profiles. For the synthesis of IWD with internal automaticity, which would satisfy the requirements for both traction and vehicle dynamics and at the same time not impede its curvilinear movement, the differential is finally adopted, in which the value of the blocking moment depends on the square of the difference in the angular velocities of the half-axles. 18) MKD with the moment of blocking, which depends on the load (including the standard two-row cam differential), quite successfully compete with the considered differentials with hydrostatic locking in terms of operating efficiency in difficult road conditions, but without fully hanging one of the wheels. 19) For MCD with hydrostatic locking, it is enough to have a diameter of a throttling hole of more than 3 mm for an unhindered start of rotation of the armored personnel carrier and its curvilinear movement without a significant increase in energy consumption and deterioration of controllability over the entire range of travel speeds. 20) In order to obtain the necessary cross-country ability and driving dynamics in difficult road conditions, for a MCD with hydrostatic locking, it is necessary to have a diameter of the droselling hole of not more than 1 mm. 21) To eliminate the contradiction, it is proposed to put a controlled solenoid valve in the gear pump, which in difficult road conditions will allow, at the command of the driver, in any driving mode to reduce the bore to a diameter of less than 1 mm or even completely closing it with the pressure relief valve in mind and volumetric losses in the pump.
Тези доповідей конференцій з теми "Hydrostatic locking"
Natali, Emiliano, Barbara Zardin, Giovanni Cillo, and Massimo Borghi. "Modelling of Hydraulic Locking Balancing Circumferential Grooves for Servo-Cylinders’ Piston." In BATH/ASME 2020 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/fpmc2020-2753.
Повний текст джерелаChen, Ping, Shumin Zhou, and Ying Shi. "Structure Design and Analysis of a Locking Band Type Quick Opening End Closure Using a New Saddle-Shaped Sealing Ring for Natural Gas Filters." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45449.
Повний текст джерелаTrivedi, Deepak, and Bernardo Kerr. "Flow Induced Dynamics of Plate Seals." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90962.
Повний текст джерелаArjomandi, Kaveh, and Farid Taheri. "Influence of the Material Plasticity on the Characteristic Behavior of Sandwich Pipes." In 2010 8th International Pipeline Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ipc2010-31518.
Повний текст джерелаPotter, Philip, Guaraci Bornia, Nicholas NG, David Robbins, Daryl Attaway, Shakib Amini, Baozhi Zhu, Ayman Wafai, and Eric Croucher. "A Subsea Wellhead Annulus Seal Ready to Meet Challenging and Critical Endurance and Performance Needs." In Offshore Technology Conference Asia. OTC, 2022. http://dx.doi.org/10.4043/31351-ms.
Повний текст джерела