Deformation Of Shaft Research Articles

Investigation on dynamic rubbing characteristics of a bladed rotor system with multi-mode rubbing fault

Dynamic behavior analysis of blades under high cycle fatigue with rubbing fault is vital for estimating the reliability of rotating machinery. This paper focuses on a novel rubbing model and the flexible dynamic characteristics of a shaft-blade-disk system (SBDS) model with considerations of various forms of rub-impacts. Firstly, the deformation relations and the motion equations of the SBDS model in steady state are derived using Lagrange's principle. Secondly, a new quasi-static blade rubbing model involving shaft deformation and blade coupling effect is established, and the influence of rub-impact correlation parameters on rubbing force is further explored. Then, both the effect of shaft-disk coupling on the blades at various states and the dynamic characteristics of numerous rubbing modes are also investigated. The results revealed that the asymmetric form of rub-impact will induce more complex vibrational behavior (such as frequency components and trajectory differences), while the symmetrical rubbing modes can keep the system relatively stable.

Experience of the Early Penile Fracture Repair: A Cross-Sectional Study in A Tertiary Care Center

Background: Penile fracture is a surgical emergency and most often it can be diagnosed clinically. But delayed presentation due to the embarrassing nature of the injury makes surgical outcome worse. Objectives: This study was conducted to compare results of early and delayed surgical interventions of patients presenting with penile fracture. Methodology: A cross-sectional study was conducted at the department of Urology, in Dhaka Medical College of hospital, Bangladesh from 30th July 2018 to 30th January 2020. Twenty- Seven (27) patients with penile fracture were enrolled in this study. They were diagnosed on the basis of history and clinical findings. They were divided into two groups; early presenter (15 patients) who came within 24 hours and delayed presenter (12 patients) who came after 24 hours. Among the early presenters, 13 patients had unilateral corporeal injury and 2 patients had bilateral corporeal injury. On the other hand, in delayed presenters, 11 patients had unilateral corporeal injury and 1 patient had bilateral corporeal injury. Surgical repair was done in all patients. Results: Patient age range was between 15 to 60 years. The commonest presenting complaints were cracking sound 26 out of 27 (96.30%), penile swelling 24 out of 27 (88.88%), pain 22 out of 27(81.48%) and detumusence during sexual intercourse or an erection 17 out of 27(62.96%), urethra bleeding 3 out 27(11.1%). Among different causes, vigorous intercourse where female on top (62.9%) was the commonest followed by bending during erection (18.5%), masturbation (11.1%) And rolling over bed (7.4%). Out of 15 patients in early group, patients presented with urethral injury. The complications in delayed repair group were, plaque formation 3 out of 15 (20%); penile shaft deformity 2(13.3%); erectile dysfunction 1(6.6%) and skin necrosis 2 (13.3%). But in early repair group only one patient developed skin necrosis which was managed conservatively. Conclusion: Fracture of the penis is a surgical emergency. Immediate surgical repair gives excellent results even in the presence of urethral injury. Early diagnosis by history and clinical examination and timely surgical intervention is essential for better outcome with minimal longterm complications. J Dhaka Med Coll. 2022; 31(2) : 210-214

A Simplified Theoretical Method for Estimating the Effect of Capsule Grouting Expansion Technology on Controlling Pile Deformation

Deep excavation and shield tunneling processes often induce significant deformation in adjacent existing pile foundations, posing risks to the safety of superstructures. To address this issue, capsule grouting expansion technology has emerged as an efficient and economical technology to actively control pile deformation during such construction activities. This technology has been applied in some engineering projects aimed at safeguarding nearby buildings or facilities. However, theoretical research on capsule grouting expansion technology is limited and lags behind its practical engineering application. This paper proposed a simplified theoretical approach for estimating the effect of capsule grouting expansion technology on the deformation of neighboring pile foundations. Initially, virtual image technology was employed to obtain an analytical solution for the lateral displacement of soil resulting from the expansion of a cylindrical cavity with infinite height. The pile was considered as an Euler–Bernoulli beam on a Winkler foundation, allowing for the calculation of the loading response of the existing pile foundation. Utilizing the two-stage method, the theoretical analytical method of the lateral deformation of the pile shaft caused by capsule expansion was obtained. The reliability of the proposed theoretical method was verified by comparing the measured and calculated results. Further investigation into the controlling effect of the capsule grouting expansion technology on the deformation of the pile foundation was conducted through parametric analyses. These analyses encompass capsule radius, the distance between the capsule and pile foundation, the depth of the capsule, the length of the capsule, and the pile base constraints.

Design of machine tool cooling system and optimization of cooling parameters based on differential cooling control strategy

Thermal errors of machine tools account for 40–70% of machining errors, with motorized spindles and linear motors being the primary heat sources adversely impacting machine tools’ precision. This article aims to solve the issue of significant thermal errors brought about by numerous internal heat sources, complex heat transfer processes, and uneven temperature field distributions. This article proposes a cooling control strategy that employs multiple channels with varying water temperature and velocity. The article also presents the design of the cooling system for a machine tool. The established multi-channel cooling control equation is then used to optimize the cooling water parameters of different channels. Ultimately, finite element simulations and cooling experiments verify the system’s efficacy. Based on the data collected from simulations and cooling experiments, it has been demonstrated that the motorized spindle motor’s thermal balance temperature decreased by 58.5% after cooling, and the shaft deformation was reduced by 70.2%. Similarly, the linear motor’s thermal balance temperature decreased by 37.13%, and the parallelism error of the machine tool guide rail was reduced by 72.3%. These results demonstrate convincingly that the machine tool cooling system can achieve more accurate and efficient cooling, which can provide a reference for machine tool thermal error control technology.

A vibration model of a flexible multiple shaft gear system with the tip relief modification

The fixed-shaft gear system (FSGS) is one critical part in gear transmission systems (GTSs), whose vibrations can significantly influence performances of GTSs. To reduce the vibrations of rigid FSGS caused by installation and manufacture errors, the tooth profile modifications without the shaft deformation were widely introduced. This paper establishes a flexible multiple shaft gear system (FMSGS) model of an unmanned underwater vehicle, which can obtain vibrations of rotor at different axial positions. However, the previous rigid FSGS model cannot obtain those vibrations. In the FMSGS model, the Timoshenko beam elements are applied to the establishment of shaft segments considering flexibility. The meshing stiffness for helical gears with different ranges of tooth profile modification are quantitatively expressed by a gear slicing method. Based on the kinetic relationship between the gear pairs, shaft segment, and bearings, the dynamic equations of FMSGS are derived. By comparing the time-domain waveforms and spectra of FMSGS, the effects of the tooth profile modification amounts and lengths on the vibrations of FMSGS are revealed. The proposed FMSGS model is validated by an experiment. This study extends the dynamic methods of FSGSs, and some suggestions on the vibration control of FSGSs are given.

Development of multi-sensors fusion monitoring system for shaft wall deformation

Ensuring shaft safety is crucial for underground coal mining. The prevailing method for monitoring shaft deformation involves manual measurements conducted regularly, necessitating numerous surveyors to descend into the shaft. This approach is laborious and time-consuming, and its reliance on human intervention significantly affects accuracy. An emerging alternative employs an enhanced laser slam scanner comprising laser ranging and inertial navigation angle measurement modules. The accuracy of the inertial navigation angle often requires refinement through laser point cloud registration to mitigate errors. However, existing research has not explored the utilization of a single inertial navigation sensor within a shaft, which potentially influences measurement outcomes. To investigate the impact of inertial navigation angle measurement errors from lidar scanners on shaft interior measurements and propose corresponding error reduction methods, this study developed a multisensor fusion system for monitoring shaft wall deformations. Three experiments were conducted to assess the accuracy of this monitoring system: a laboratory experiment, a simulated experiment, and a real shaft experiment. The results demonstrated that the maximum mean absolute errors (MAEs) in the laboratory and simulated shaft experiments were 0.06 cm and 0.30 cm, respectively, validating the reliability of the point cloud processing algorithm. In the real shaft experiment, the maximum MAE was 0.48 cm, confirming the measurement accuracy of the monitoring system. Compared to manual measurements, the system reduced the measurement time by 48% and streamlined the process from 12 to 3 steps. These findings highlight the monitoring system’s centimeter-level accuracy, efficiency in reducing measurement time, simplification of the measurement process, and elimination of the need for human entry into the shaft.

Investigation of Lateral Vibrations in Turbine-generator Unit 5 of the Inga 2 Hydroelectric Power Plant

The article presents a case study on the Investigation of lateral vibrations in the turbine-generator unit 5 of the Inga 2 hydroelectric power plant in the Democratic Republic of the Congo. Lateral vibrations were experimentally determined using twelve proximity and eddy-current probes, positioned on each measurement plane. The results were analyzed using the Dasylab and R software. Hence, it was observed that the vibration amplitudes of the upper guide bearing, lower guide bearing, and pivot/rotor exceeded acceptable or critical limit values of the international vibration standard for a rotating speed between 100-250 rpm. These excesses can lead to rotor mass imbalances, the eccentricity of the rotor axis relative to the rotation axis of the shaft, and the deformation of the coupling shaft between the upper rotor shaft and the turbine rotor shaft. Subsequently, the means and the variances of the vibration amplitudes were evaluated and compared to the reference values of the international standard. The results of the compliance analysis revealed statistically significant differences between the measured amplitudes and the reference values. Thus, it indicates deviations from international specifications.

Simulation test on shaft deformation induced by mining subsidence under similar gravity field in deep soil strata

Many shafts in China have experienced large deformations in the deep soil Strata, which has had a significant impact on mining safety. This study conducted a geotechnical model test called the seepage force model to address the deformation issues of shafts caused by mining solid mineral resources in regions with deep soil strata. This test simulated the impact of mining disturbance on shaft deformation within the soil section. The simulation utilized monitoring data from the model shaft, facilitating the determination of deflection displacements across different protection areas. The findings indicated a nearly linear relationship between the maximum horizontal displacement of the shaft and the mining coal seam thickness. The shaft protection areas within the soil section were reconfigured by modifying the movement angle from 45° to 37.6°. Consequently, the maximum horizontal displacements of the prototype shaft decreased to 73.8, 112.7, and 170.9 mm for mining coal thicknesses of 2.7, 5.3, and 8.0 m, respectively. These values represent 26%, 24.6%, and 26.7% reductions from the original design shaft displacements. When combined with the probability integral method, the simulation test results concerning the shaft protection rock pillars were exhaustively examined. This analysis paves the way for a more logical and reliable design approach for shaft protection rock pillars in areas characterized by deep soil and thin rock strata. The study findings hold immense significance in effectively mitigating and managing mining-induced subsidence disasters and ensuring the optimal design of shaft protection zones.

Theoretical and experimental study on the dynamic behavior of spur gear transmission system during hovering maneuver flights

Gear transmission systems, a crucial component of aircraft power transmission, are subjected to time-varying additional inertial forces and gyroscopic moments in noninertial frame environments when the aircraft performs maneuvering flight actions. In this study, a noninertial frame dynamic model of the gear transmission system during hovering maneuver flights was established, and the accuracy of the theoretical model was verified through conducting hovering maneuver flight simulation experiments. The dynamic behavior of the gear transmission system housing, bearings, and shafts under different hovering maneuver flight parameters was studied. The findings reveal that the maneuvering acceleration of the carrier causes varying degrees of change in the vibration acceleration of the housing, the center distance of the gear pair, the bearing force, and the bending deformation of the shafts, among which the magnitude and direction of the radial bearing force and shaft bending deformation are significantly affected by the maneuvering acceleration. Moreover, the risk of failure can be mitigated through the adjustment of the inclination angle to minimize the bending deformation of the fragile shaft resulting from maneuvering acceleration.

Analysis of Crooked Cane Carrier Shafts in a Sugar Factory

This study explores the deformation of Cane Carrier shafts under overload in sugar mills, pinpointing overload and inadequate maintenance as key culprits. Recommendations include revised load management, rigorous preventive maintenance, and systematic overload monitoring. These strategies promise to reduce shaft damage and enhance mill efficiency, presenting crucial advancements for mechanical engineering and the sugar industry. Highlight : Overload and Maintenance: Identifies overload and insufficient maintenance as principal causes of shaft damage. Preventive Strategies: Recommends enhanced load management and rigorous preventive maintenance to prevent future issues. Operational Improvement: Proposes regular overload monitoring to improve operational efficiency in sugar mills. Keywords: Cane Carrier Shaft, Overload Damage, Preventive Maintenance, Operational Efficiency, Load Management

Effect of total heat input on coaxiality of rotor shaft in laser cladding

Abstract The total heat input by the laser directly affects the temperature distribution of the rotor shaft during the cladding process, and then affects its coaxiality. This article uses ANSYS for numerical simulation to study the effect of laser heat input on the deformation of the rotor shaft during laser cladding process. Simulate and analyze the temperature and stress fields inside the rotor shaft using thermal coupling. The results show that by changing the pitch, axial cladding width and laser irradiation duration to change the laser induced total heat input, a more uniform temperature distribution can be generated in the rotor shaft. The increase of temperature distribution uniformity can reduce the deformation of rotor shaft during cladding. Using a cladding equipment, iron based customized alloy powder was coated on the 45 steel rotor shaft for cladding experiments. And the mechanical properties and coaxiality of the rotor shaft after cladding were measured. The results showed that the hardness and wear resistance of the cladding layer were significantly improved compared to the substrate, and the changes in coaxiality of the rotor shaft were consistent with the simulation results, with relatively small errors. It is of great significance for repairing damaged rotor shafts.

A function method for static load-sharing analysis of multiple-branch power-split gearing system

A function method was proposed for the static load-sharing analysis of the power-split gearing system. Taking a two-stage three-branch star gearing system used in a certain type of aircraft engine as the object, based on the deformation compatibility condition that considers the torsional deformation of the dual star gear shaft, the function that describes the changing rule of the load-sharing coefficient was established, which could calculate the load-sharing coefficient without the truncation error. Through analysing the load-sharing susceptibility to gear eccentricity errors with the traditional graphic and function method, respectively, the correctness and advantages of the proposed method were verified. Finally, considering the randomness of eccentricity errors in gear manufacturing and installation, the load-sharing coefficient function matrix was established to analyse the load-sharing characteristics when the errors were generated randomly. The result shows that the function method can avoid possible truncation errors in the load-sharing coefficient calculation and make the static load-sharing analysis more efficient; the randomness of the error value has a greater influence on the load-sharing than the randomness of the error direction; the randomness of the error direction may affect the susceptibility of the load-sharing to installation errors, which should be considered in the analysis of load-sharing susceptibility to the error with a fixed direction.

A Novel Optimization Strategy of Bearing Geometry with a Length to Diameter Ratio of 1.25 under Severe Operating Conditions Using Taguchi Method

Robust and well-designed rotor-bearing systems ensure safe operation and a high level of reliability under severe operating conditions. A deviation in the shaft axis with respect to the bearing longitudinal axis represents one of the most unavoidable problems in bearing systems. This deviation results from installation errors, manufacturing errors, shaft deformation under heavy loads, bearing wear, and many other causes. Each of these deviation sources has its negative consequences on the designed characteristics of the system. This work deals with the geometrical design of a journal bearing using three forms of profiles (linear (n=1), quadratic n=2 and cubic (n=3) profiles) in order to enhance bearing performance despite the presence of the inevitable shaft deviation. In addition, a wide range of bearing profile parameters are considered in the analysis to optimize the bearing profile based on the use of the Taguchi method. A general form of shaft deviation is considered to account for both horizontal and vertical deviations. A numerical solution is obtained using the finite difference method. The results show that all three suggested forms of bearing profiles elevate the film thickness significantly and also reduce the friction coefficient, but with different effects on the maximum pressure values. The Taguchi method illustrates that the optimal geometrical design parameters are the quadratic profile and the modification of one-fifth of the bearing width from both sides at a height of just less than half the radial clearance (0.4 C) at the bearing edges. These values give the best combination of the considered main bearing characteristics: the minimum film thickness, coefficient of friction, and maximum pressure. The results show that the minimum film thickness is increased by 184%, the maximum pressure is reduced by 15.1% and the friction coefficient is decreased by 6.4% due to the use of the suggested design. The outcome of this work represents an important enhancement step for the rotor bearing performance to work safely with high reliability under severe shaft deviation levels. This can be implied at the design stage of the bearing, which requires prior knowledge about the operating conditions in order to have better estimation for the levels of shaft deviation.

Influence of Cavitation and Shaft Deformation in the Analysis of Lubrication of the Stern Bearing

The cavitation phenomenon and shaft deformation have a significant impact on the tribological performance of the journal bearing. A mixed lubrication model is developed that takes into account surface roughness and asperity contact, as well as the effects of cavitation and deflection. The fluid–solid coupling effect in bearing deformation, asperity contact, and film pressure are investigated. The effect of boundary conditions on the lubrication regimes is discussed. The results of simulations with and without cavitation are compared under steady-state conditions. The results show that when cavitation is considered by the mixed lubrication model under a given load, the eccentricity is reduced, and the maximum oil film pressure is also reduced. The speed range of the bearing simulated with the mixed lubrication model increases after considering deflection deformation. The mixed lubrication model proposed in this paper is able to provide accurate results of pressure distribution and coefficient of friction and can be applied in the design and analysis of journal bearings.

(257) Ultrasound Classification System for Peyronie's Disease

Abstract Introduction Peyronie’s Disease (PD) is characterized by a fibrous scar of the tunica albuginea. PD is typically imaged with 2D ultrasound. We propose a classification system of these ultrasound findings in the evaluation of PD. Objective The purpose of this study is to establish a functional sonographic classification system for evaluating PD and to examine the relationship between PD grading and curvature, duration of PD, and vascular erectile status. Methods In our study, 395 patients with PD underwent intracavernosal injection with an erectile agent (ICI) followed by Color Doppler Duplex Ultrasound (CDDU). All CDDU studies were performed by a single examiner and all PD grading was done by two independent reviewers using saved images. Ultrasound findings including peak systolic velocities (PSV) and resistive indices (RIs) were recorded. PD grades of 2D images were classified into three grades: Grade 1 acoustic shadowing without calcification; Grade 2 focal microcalcifications of the tunica, pillars, or septal fibers; Grade 3 confluent calcification of the dorsal, septal, ventral tunica albuginea. Results There were 250 patients classified with Grade 1 (63%) sonographic changes, 75 with Grade 2 (19%), and 70 with Grade 3 (18%). All groups had similar median ages and body mass index (BMI): Grade 1 (59.3 yr), Grade 2 (59 yr) and Grade 3 (60.3 yr), p = 0.711; BMI 27.6, 28.2, 27.7, p = 0.813. Additionally, medical and surgical risk factors for erectile dysfunction were similar across the three groups; these included hypertension, heart disease, diabetes mellitus, hyperlipidemia, smoking history, and history of prostate surgery. Most patients had previously used PDE5-Inhibitors (293/395). History and/or physical findings of Dupuytren’s palmar contracture was noted in 30/395 (7.6%) of men. The median duration of PD was not significantly different across the three groups (12, 12, 14 months p = 0.639). Neither CDDU diagnoses (Table 1) nor curvature varied by sonographic grades (Table 2). Conclusions The scar resulting from PD seals together the outer longitudinal and inner circular layers of the tunica albuginea causing deformity of the erect shaft. PD plaques are usually palpable and associated with focal thickening of the tunica. On 2D ultrasound, the typical appearance is an acoustic shadow. Most of our patients presented with Grade I acoustic shadowing and no calcifications 250/395 (63%). On the other hand, 19% had acoustic plaque shadowing and additional findings of focal tunica or deep microcalcifications and 18% had confluent calcification of the dorsal, septal or ventral tunica. We propose a unique and reproducible classification system for Peyronie's Disease. This grading system is based on grayscale ultrasound of Peyronie’s plaques may serve the purpose of diagnostic evaluation, didactic teaching and integrated research. Disclosure No

Theoretical and Experimental Study on Wear Behavior in Order to the Improvement of Die Geometry in the Radial Forging Machine

Deformation of shafts and seamless tubes are carried out by a radial forging machine in order to achieve the required dimensions and improve the mechanical parameters of the material. Hence, the study of improving the performance of the radial machine leads to an increase in the quality of the forged tube, while the machine equipment in the process of radial forging will have the least erosion. In this process, the workpiece is surrounded by four tools and during the repeated blows of the die, the desired dimensions of the workpiece are obtained. with regards to the contact surface of the die with the workpiece, the most common tool that faces the highest erosion is the die. Therefore, the improvement of die geometry in order to minimize wear has been investigated in this article. Also, the distribution of die temperature and analysis of die stress during the process has been implemented. Accordingly, three types of die geometries: Flat, Concave and Convex are considered to measure the depth of wear and determine the maximum erosion through 3D finite element simulation and experimental estimates. Therefore, according to the comparison between numerical and analytical results in the case of wear analysis with experimental results, the validation of simulation was confirmed.

Research of deformation law about guide rails under the action of mining deformation in mine vertical shaft

To lay a foundation for alleviating the influence of mining shaft deformation (MSD) on the guide rail (GR) and monitoring the shaft deformation state, this paper studies the deformation law and mechanism of the guide rail under the MSD. Firstly, a spring is used to simplify the interaction between the shaft lining and surrounding rock soil mass (SRSM) under MSD, and its stiffness coefficient is deduced by the elastic subgrade reaction method. Secondly, a simplified finite element model is established based on spring element, the stiffness coefficient is calculated by the derivation formula, and its effectiveness is verified. Finally, the deformation law and mechanism of GR are analyzed under different types and degrees of MSD, and the deformation characteristics are studied under the disconnection between the shaft, bunton and guide rail. The results show that the established finite element model can better simulate the interaction between the shaft lining and SRSM, and the calculation efficiency is greatly improved. The guide rail deformation (GRD) has a strong ability to characterize MSD and owns the distinctive feature corresponding to different types and degrees of MSD and the connection state. This research can provide reference and guidance for the shaft deformation monitoring and the maintenance and installation of the GR, and also lays a groundwork for studying operation characteristic of hoisting conveyance under MSD.

Calculation of the Heat Flux from a Ball Screw Nut to the Nut Raceway

In the field of precision machining, temperature fluctuation tends to cause the most significant machining errors. In particular, heat, which is generated in the nut of the ball screw feed system during movement, can deform the screw shaft significantly. In order to calculate and evaluate the thermal deformation of the ball screw shaft, the rate of the heat transfer from the nut to the screw shaft must be known. This rate can be calculated by subtracting the heat transfer rate to the nut raceway from the heat generation rate of the nut. Hence, it is necessary to calculate the heat flux from the nut to the nut raceway. This paper introduces a novel method to calculate the heat flux from the nut to the nut raceway. The new approach also enables calculations for different operating conditions. Furthermore, an experimental setup is established to measure the temperature increase, from 0 to 180 s after the nut starts moving, for various operating conditions. It is then theoretically shown that the 0–180 s temperature increase/heat flux curves for the nut are “universal”, i.e., the curve remains unchanged for the different operating conditions. Subsequently, a thermal model using the finite element method (FEM) is developed to simulate the nut temperature increase over time, which is then compared with the experimental data. As a result, it becomes possible to determine the heat flux from the nut to the nut raceway and calculate the 0–180 s temperature increase/heat flux curve (ΔT˜0~180s,Training Data) for the training group. Finally, the heat flux from the nut to the nut raceway is calculated for ten different operating conditions in the test group using the 0–180 s temperature increase/heat flux curve of the training group (ΔT˜0~180s,Training Data). The corresponding temperature curves are then calculated by inputting the values of the heat fluxes into the FEM model. The highest root mean square error (RMSE) between the calculated and experimentally measured temperature increase was 0.16 °C for Test 7 (the error was 10.7%). This result indicates that the new method is valid and feasible for calculating the heat flux from a ball screw nut to the nut raceway.

Lubrication analysis of stern bearing during ship severe turning maneuver

Stern shaft deformation caused by ship maneuvering will lead to stern bearing lubrication failure and wear. Based on the displacement superposition method, the deflection equation of the stern shaft under the action of the interface force and the propeller load was established. The fluid-solid coupling model of the stern bearing was established by using the averaged Reynolds equation, the Greenwood-Tripp model, and the influence coefficient method. The model was experimentally validated. The influence of the shaft bending deformation caused by the propeller load change on the lubrication characteristics is discussed. The results show that the shaft bending deformation leads to the changes in lubrication characteristics along the axial and circumferential directions. Compared with the vertical load alone, the existence of horizontal propeller load will significantly reduce the minimum nominal oil film thickness and friction coefficient. Under hydrodynamic lubrication, the direction of horizontal load has little effect on friction coefficient.

A method for measuring the deformation of shafts of magnetorheological couplings

A method is proposed for determining the maximum shear strains and stresses of the elastic shafts of a magnetorheological coupling based on the finite element method. To measure the angular mismatch of the coupling, a method for measuring the torque is proposed, based on determining the torsion deformation of the shafts using broadband frequency modulation. Keywords: magnetorheological coupling, torsional deformation, elastic shaft, torque, angular mismatch, swept frequency generator. e678xk@mail.ru, gord349@mail.ru, acidwolfvx@rambler.ru, oxulkovs@mail.ru, aplehov@mail.ru