最新刊期
期 6 ， 2020
- 摘要：In order to study the influence of the number of planetary wheel and clearance on the dynamic load sharing characteristics of the planetary transmission system， based on the lumped parameter theory， considering the factors such as error， support stiffness， load and clearance， the dynamics model of the central wheel floating planetary transmission system is established. The model is solved by Runge-Kutta numerical method， and the relationship between the number of planetary wheel， the clearance and the load sharing characteristics is established. The results show that， with the change of the tooth flank clearance， the load sharing coefficient decreases rapidly and tend to be gentle， and the tooth flank clearance has a compensating effect， which reduces the uneven distribution caused by the increase of the planetary gears and improves the load sharing characteristics of the system. As the support clearance increases， the load sharing coefficient decreases almost at a constant speed， and the support clearance makes the system in a floating transmission state， which has better load sharing characteristics. When the torque is small， the system is highly sensitive to the clearance and can effectively alleviate the problem of uneven distribution caused by the error. As the torque increases， the error excitation is suppressed and the load sharing performance is improved.关键词：Planetary transmission
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发布时间：2022-10-20 - 摘要：According to the structure and transmission principle of the dual shock wave sleeve movable tooth transmission，the equation of central tooth profile has been derived. On the premise that the working tooth profile of the center wheel does not interfere，the relationship between structural parameters is established. Considering the nonlinear relationship between the load and deformation and the influence of the hollow degree of the movable tooth on the deformation，the nonlinear mechanical model of meshing pair is established to analysis the nonlinear meshing force，changing law and influencing factors of each meshing pair. A non-Hertz contact analysis model is established for the structural characteristics of finite long line contact meshing of each meshing pair of the sleeve，and the effective contact area and contact fatigue stress of each mesh pair are solved by numerical method. The contact fatigue strength of each mesh pair and the bending fatigue strength of the pin are analyzed. The results show that the relationship of structural parameters and the influence factors of meshing force provide reference for the design of double shock sleeve movable tooth transmission，by using the non-Hertz contact model and the nonlinear mechanical model， which take into account the hollowness， the error caused by simplification based on linear elasticity and hertz theory can be reduced， and the strength calculation is more in line with practical situation.关键词：Dual shock wave sleeve movable tooth transmission;Tooth profile synthesis;Nonlinear mechanical property;Non-Hertz contact;Strength calculation
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发布时间：2022-10-20 - 摘要：Cage aquaculture is an important strategic direction for marine aquaculture. Aiming at the problems that the existing offshore cages are difficult to adjust the breeding areas adaptively to optimize the ecological environment and the difficulty in transportation due to their large size， a novel primary and secondary embedded deployable offshore cage is proposed which the over-constrained spatial mechanisms and planar compliant mechanisms are respectively adopted as the primary and secondary cages. A closed-loop cable-driven module is designed to deploy the cage through the pull and release of the cable. Then， the evolution of the dimension constraint types of the threefold-symmetric Bricard mechanism which forms the primary cage mechanism is investigated. The geometric invariant characteristics that three symmetric planes intersecting at a determined line are revealed so that the cage driven mechanism with the symmetrically plane intersecting line as the axis of mechanism folding is constructed. Further， by establishing the kinematics equation of the primary cage mechanism， the relationship between the driven angle and corresponding open state of the cage can be derived from geometric projection on the symmetric planes. The novel primary and secondary embedded deployable cage mechanism with large deployable ratio can provide new thread for the design of offshore cages.关键词：Offshore cage
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发布时间：2022-10-20 - 摘要：The contact condition of gear surface can be improved by preparing the antifriction coating， and then strengthen the fatigue life of gear. The influence of antifriction coating on contact strength of gear is studied. Firstly， the antifriction coating is prepared on SRV standard specimen surface， the friction coefficients of coated specimens are obtained through friction-wear test. Then， the fatigue endurance tests are carried out for uncoated and coated automatic transmission gear in automotive transmission， the surface morphology characteristics of the gear are obtained by measuring. Lastly， an analysis model of contact strength on rough surface is established based on nonlinear elastic-plastic contact theory of gear. The effect of antifriction coating on improving the contact fatigue strength of gear is obtained. The results show that the manganese phosphate coating can improve the fatigue endurance life of gears by reducing the contact stress， the maximum contact stress of gear decreases first and then increases with the roughness， which provides theoretical guidance for strength designing of the coated gears.关键词：Automotive gear
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发布时间：2022-10-20 - 摘要：The field modulation magnetic gear is a kind of transmission device with broad development prospects. It has the advantages of no friction， no pollution， less maintenance and easy installation. The magnetic gear models with different transmission ratio are established. The input and output torque waveforms of different models are compared. The influences of the number of pole pairs of inner rotor （P1） and the number of pole pairs of outer rotor （P2） on torque ripple are analyzed. According to the principle of magnetic field modulation and spatial magnetic field harmonic distribution， the torque ripple of magnetic gear is greatly affected by P1 and P2. The research results show that the torque ripple can be effectively reduced by selecting the magnetic gear with P1=4， P1:P2=1:n+0.25 or 1:n+0.75 （n is a natural number）.关键词：Magnetic gear
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发布时间：2022-10-20 - 摘要：In view of the dynamic characteristic analysis of RV reducer is difficult problems. A simulation model of RV reducer is established based on the theory of power bond graph， the mathematical formula for transmission ratio of RV reducer is deduced， and the simulation modeling method of single transmission loop and complete loop power bond graph of RV reducer is given. By using 20-sim simulation software， the simulation model of RV reducer is analyzed， and the design proposal of RV reducer is given. This method can be used for reference to improve the design level of the reducer.关键词：RV reducer
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发布时间：2022-10-20 - 摘要：The 2-degree-of-freedom spherical 5R parallel mechanism is taken as the research object， and teaching-learning-based optimization （TLBO） algorithm is applied to solve the optimization design problem of mechanism dimensional parameters. The expression of inverse positional analysis for the mechanism is derived by means of coordinate transformation. Consequently， the transmission angle is used as the evaluation index of motion/force transmission performance， and then the definition and numerical calculation method of good transmission workspace （GTW） are given. Taking the maximizing area of GTW as object， a constrained optimization model of dimensional parameters is established， and TLBO algorithm is employed to solve this problem. The results show that the presented model and algorithm are feasible and effective.关键词：Spherical 5R parallel mechanism
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发布时间：2022-10-20 - 摘要：Based on space curve meshing theory, a conical Line Gear (LG) mechanism without backlash is studied. A conical helix is selected as the driving contact line, and the driven contact line which conjugated with driving contact line is solved by the LG meshing theory. The concave-convex contact circular section, which is via contact point and perpendicular to the direction of angular velocity of the driving gear is established without backlash. The concave-convex tooth surfaces without backlash can be constructed by scanning the circular section along the center lines. Therefore, conjugate contact lines lie on the constructed tooth surfaces. The maximum number of teeth is discussed on the basis of the radius of section circle and the circumference of end cone. According to tooth surface equations, a 3-D model is established and kinematics simulation experiment is carried out. The result shows that the conical LG constructed by this method can realize the smooth transmission process with the designed transmission ratio. Based on meshing equation of LG, a method for constructing the tooth surface of novel conical LG is proposed, which provides a new solution for the orthogonal axis gear transmission.关键词：Space curve meshing theory
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发布时间：2022-10-20
Theory·Reserach
- 摘要：The power-release function of the vehicle latch is the physical basis for passengers' non-physical operation mode to enter the vehicle and plays a vital role in the intelligent automatic door system. Aiming at the demand of dual branch chains cooperative drive of the electrical lock and the power release， also the non-interference between the multiple kinematic branch chains of the vehicle latch， a novel power release kinematic chain with the variable topological characteristic is constructed. Based on the synthesis theory of the topological structure for planar mechanism， the intermittent mechanism of incomplete gear is synthesized into the power release kinematic chain. The incidence matrix is used to study the topological structure state of the power release branch chain. Furthermore， through the physical prototype fabrication and function experiment of the novel vehicle latch， the feasibility of the power release vehicle latch is verified. This research provides a novel idea for the design of the kinematic chain of the vehicle intelligent latch.关键词：Automotive power vehicle latch
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发布时间：2022-10-20 - 摘要：The traditional Continuously Variable Transmission （CVT） dynamic control strategy takes the maximum engine power as the control target. As CVT efficiency varies greatly under different loads， the maximum engine power cannot guarantee the maximum driving power at the same time. For this， the matrix optimization algorithm is designed to calculate the CVT dynamic speed ratio under different pedal opening and vehicle speed with the maximum driving power as the target. A whole vehicle model is established by using GT-drive software， and the control strategies before and after optimization are simulated and compared. The result indicates that the optimized control strategy can improve the driving power and the maximum vehicle speed to different degrees under each pedal opening.关键词：CVT efficiency
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发布时间：2022-10-20 - 摘要：A parallel leg mechanism of hexapod agricultural robot with 1 translation and 2 rotation (1T2R) is designed and studied based on the theory of direction and position characteristics ( POC). Firstly, based on the method of POC, a number of parallel leg mechanisms satisfying the functional requirements are synthesized. Then, according to the actual needs of agricultural application, a mechanism with superior performance is selected. The analysis results show that the mechanism has the advantages of simple structure, large workspace and convenient control. Finally, the position forward and inverse solutions of the optimized mechanism are analyzed. The results show that the forward and inverse solutions of the mechanism are simple, both of them can be solved analytically, and the forward and inverse solutions of the mechanism have at most four sets of solutions.关键词：Hexapod agriculture robot
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发布时间：2022-10-20 - 摘要：In order to get the precision linear motion output，a piezoelectric flexible micro drive system that composed of piezoelectric actuators and flexible micro mechanism is designed，and the system has sub-micron positioning accuracy driven by piezoelectric actuator. A kind of precise flexible micro mechanism is designed based on the principle of flexible hinge guide and transmission，and on this basis， a design scheme of piezoelectric flexible micro drive system is proposed. The kinematics analysis，strength analysis and dynamic analysis of the system are accomplished by the finite element method. The analysis results show that the system has the advantages such as high positioning accuracy which the maximum positioning error is 0.24 μm，good strength performance and excellent dynamic performance. This study has a certain reference value for the research and application of micro drive system.关键词：Sub-micron
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发布时间：2022-10-20 - 摘要：Firstly，in terms of traditional Chinese medical massage techniques—pushing method， pressing method， kneading method and rolling method， the characteristics of each massage technique are analyzed， and the degrees of freedom（DOF） of the 4 kinds of massage technique mechanism are obtained. Then， according to the DOF required by the mechanism， the overall design scheme of the mechanism is proposed. As for the parallel mechanism， the topological structures are designed and the DOF is analyzed. At last the direct and inverse solutions of the parallel mechanism are discussed， and the 3D modeling and kinematics simulation are carried out. The results show that the parallel mechanism not only has a simple structure and easy solution of position analyses， but also satisfied the requirements of various massage techniques mentioned above， the theoretical support for the practical application of traditional Chinese medical massage manipulator is provided.关键词：Massage manipulator;Parallel mechanism;Position analysis;Simulation
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发布时间：2022-10-20 - 摘要：Based on the principle and method of ergonomics， the structure and motion characteristics of the lumbar joint of human body are analyzed. According to the above features and combined a discontinuously movable mechanism in the limb， an office chair for health is a hybrid mechanism that has 3R motion with bifurcated motion and can realize the human body waist joint movement is proposed. Then the operation mode is analyzed. The results show that， the hybrid mechanism has instantaneously three degrees of freedom at the constraint singular configuration. At this time， the method of redundant drive can be used to change the three-rotation mode into the two-rotation mode. Finally， the forward solution analysis equations of the hybrid mechanism in different operation modes are derived. The results show that the mechanism is completely decoupled.关键词：Sedentary behavior
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发布时间：2022-10-20 - 摘要：The gearbox dual-branch torque transmission system is designed to increase the gearbox's carrying capacity and power density, and to solve the problems of high power，large torque and large transmission ratio in the gear transmission. The self-adaptive load sharing shunt transmission of the system is realized through herringbone gears, and the problem of transient eccentric load is solved by the deformation compensation error of the diaphragm flexible coupling. The DyRoBeS software is used to establish a dual-branch split-torsion transmission system model with flexible couplings，and the rotor dynamics analysis of the system model is performed. It is verified that the designed dual-branch split-torsion transmission system could meet the manufacturing requirements.关键词：Gearbox
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发布时间：2022-10-20 - 摘要：To design a crawler fire-fighting robot for diverse working environments， the reliability and stability are even more important. By utilizing the crawler-type chassis structure and the damping spring shock absorber used as the damping system， the traditional vibration problems caused by the traditional crawler structure are overcome. The motion equation is derived by the kinematics analysis on the robot crawling ladder. By conducting the simulation analysis on the crawling process of the designed crawler fire-fighting robot under the Track LM module of RecurDyn， the driving torque required for the robot ladder is obtained. According to the curve of gravity change obtained by simulation tests， the stability analysis on the robot to crawl ladder is achieved.关键词：Fire robot
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发布时间：2022-10-20
Design· Calculation
- 摘要：In order to realize planar deformation of the tooth ring in radial direction which leads to planar line contact engagement between tooth profiles， according to the geometric equation of the cylindrical shell theory， the connection condition between the bell shaped shell and the tooth ring is proposed. A parametric bell shaped flexspline shell contact model is established. The geometric condition of the bell shaped curve which realizes planar deformation of the tooth ring is solved iteratively，that is，the relationship between the ratio of the radius of the tooth ring to the radius of the bell shaped curve and the central angle of the circular bell shaped curve. The result is fitted with a five-order spline curve expression. The connection condition between the bell shaped shell and the cup bottom is solved and according to the theory of circular thin plate，the calculation method of the deformation and stress of the cup bottom is proposed. The research found that the stress of the bell shaped flexspline cup bottom increases exponentially with the increase of the shaft radius when the shaft radius greater than 0.65 times of the cup bottom radius. However，the geometric conditions of the bell-shaped curve for the planar deformation of the tooth ring are independent of the shaft radius.关键词：Taper deformation
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发布时间：2022-10-20 - 摘要：According to the requirements of energy supply of lunar exploration engineering spacecraft， a novel adjustable solar panel with three degrees of freedom is proposed. The 2UU-UPU parallel mechanism is adopted as the prototype of adjustable solar panel mechanism. The constraint equation and positional relationship of the adjustable solar panel mechanism are analyzed， the degree of freedom of parallel robot is solved by the theory of spiral， and the positional anti-solution equation is introduced by the modified Kutzbach-Grübler formula. On this basis， the system is simulated by using Adams software， and the simulation results are compared with theoretical numerical calculations to verify the correctness of mathematical modeling of the adjustable solar panel mechanical and the rationality of the three-dimensional solid model.关键词：Solar panel
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发布时间：2022-10-20 - 摘要：A synthesis and solution regions analysis method for linear guide mechanism when the side link and frame are collinear is proposed. The method is based on the theory of motion geometry， all of straight line linkage with Ball point on the coupler is obtained by the analytical method， the dimension and kinematics properties of mechanism are expressed intuitively. The designer calculates the feasible regions that satisfy these constraints by applying some of the architectural kinematic constraints required for the engineering. The proposed method will discard the segments that do not meet the conditions according to the constraints， and then quickly and accurately find the engineering practical mechanism to solve the problem of difficult mechanism optimization. Finally， the correctness and feasibility of the proposed model is verified by the developed linear guide mechanism synthesis and simulation software platform.关键词：Linear guide mechanism
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发布时间：2022-10-20 - 摘要：Based on constraint spiral theory，the modified Grübler-Kutzbach formula is used to analyze the degree of freedom of 2RPS/2SPS parallel mechanism. The inverse positional solution equation is established by the space coordinate transformation equation and the closed vector method，and the forward position problem is performed by Newton iteration method in numerical analysis based on inverse solution. The first-order influence coefficient matrix is established by the fictitious mechanism method，and the numerical example is verified by the differential method based on Matlab. The results show that the calculation results of the two methods are consistent. Finally，Adams software is used to conduct kinematic simulation of the 2RPS/2SPS parallel mechanism，and the displacement，velocity，acceleration and angular velocity change curves are obtained，which further verifies the correctness of the operation results of the first two methods. It also indicates that the 2RPS/2SPS parallel mechanism has good motion characteristics.关键词：Parallel mechanism
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发布时间：2022-10-20 - 摘要：The key parameter that characterizes the transmission accuracy of the precision reducer is the transmission error， but the problem of analyzing the accuracy of the transmission error measurement of the precision reducer for the robot is still blank. For this， the RV reducer is used as the measurement object， using the existing precision reducer performance testing machine， characterized by the measurement uncertainty evaluation method， the actual measurement of the rotation accuracy and coaxiality of the instrument shaft system is analyzed. The degree of influence of each error source on the transmission error measurement accuracy is calculated as the combined uncertainty of each error source. The calculation results show that the precision reducer performance testing machine has high measurement accuracy and through repeated testing of the test machine， the transmission error measurement repeatability is less than 2″， which can meet the precision reduction gear transmission error measurement requirements.关键词：Precision reducer
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发布时间：2022-10-20 - 摘要：In order to study the coupling effect between tribology and dynamics of double involute gear transmission， according to the gear dynamics， load-sharing， and elastohydrodynamic lubrication theory， the friction dynamics model of double involute gears is established， the coupling effect between elastohydrodynamic characteristics and dynamics is studied. The dynamic load solved by the dynamics model is applied to the mixed elastohydrodynamic lubrication model to solve the friction coefficient and other parameters. The friction coefficient is put back into the dynamics model to study the dynamics behavior of double involute gear. The results show that the coupling effect of dynamics and elastohydrodynamic lubrication has a significant effect on the gear dynamics behavior. At low rotating speed， the distribution of friction coefficient and oil film thickness under dynamic load is similar with that under steady load， whereas those distribution changing obviously when the rotational speed increases.关键词：Double involute gear;Gear dynamics;Load-sharing;Elastohydrodynamic lubrication
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发布时间：2022-10-20 - 摘要：In order to simulate the structure and function of human arm and wrist joint, a 3-DOF(degree-of-freedom) cable-driven humanoid wrist is put forward, which is different from the traditional bionic joint, its function is achieved by a ball joint which connects the moving base platform and the base. However, the introduction of cables increases the difficulty in modeling and control. Firstly, ignoring the gravity property of the cable, the standard dynamics equation of the humanoid-wrist joint is built by using Lagrange method. At the same time, taking into account the redundant actuation and single-direction force for the cables, the cable tension distribution optimization model is established, and the cable tension distribution is obtained by genetic algorithm. Secondly, aiming at the influence of the cable mass, a more accurate dynamics model is established by considering catenary. Finally, the two models are simulated and the simulation results are compared.关键词：Cable-driven
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发布时间：2022-10-20
Test·Analysis
- 摘要：In order to accurately identify the known and unknown fault types，a new fault diagnosis method for wind turbine gearbox based on the kernel fuzzy c-means clustering（KFCM）is proposed. The initially cluster centers and the kernel parameter of the KFCM model are taken as optimization variables，and an improved grey wolf optimization algorithm is used to find the optimal centers. The introduction of Levy flight strategy and non-linear coefficient vector in the improved grey wolf optimization algorithm can improve the convergence speed and accuracy of the algorithm， and the clustering centers and kernel parameters can be obtained under the optimal classification results. Then，according to the similarity between the new sample and the centers in the kernel space，firstly whether the sample belongs to a known fault type is determined， and then the fault type is diagnosed. Finally，the effectiveness of the proposed method is verified by experiments simulating different fault types of wind turbine gearbox.关键词：Grey wolf optimization
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发布时间：2022-10-20 - 摘要：The bidirectional transmission error method is a dynamic continuous backlash detection method based on transmission error detection. Aiming at the fitting error problem of traditional static hysteretic curve testing RV reducer， an improved hysteretic curve method is proposed. By changing the testing steps， the measured data can form a continuous closed curve， avoiding the measurement error caused by data fitting. Comparison and analysis of hysteresis curve and bidirectional transmission error method for detecting backlash， under the same torque， the former measured the backlash corresponding to a certain meshing point， while the latter measured the curve of backlash variation. Under different loads， the former measured the curve of backlash versus torque， while the latter measured the curve cluster of backlash， which not only reflected the fluctuation of backlash with meshing position， but also reflected the change of backlash with load. Tested with RV40E prototype shows that the improved hysteresis curve method performs well in static testing， but the difference measured by the hysteresis curve method is always within the fluctuation range of the bidirectional transmission error method. The experimental data show that the bidirectional transmission error method has a high degree of automation， the time is shortened by 25.44%， and the efficiency is obviously improved.关键词：Hysteresis curve;Fitting error;Bidirectional transmission error;Backlash detection
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发布时间：2022-10-20 - 摘要：A method and device for measuring helical angle of non-contact helical cylindrical gear based on laser displacement sensor is presented. According to the least square method， the collected points on the measured helical gear end section are fitted into a smooth curve （tooth profile）， and the intersection points between the curve and the indexing circle are obtained. Several intersection points of the tooth profile and the indexing circle on different cross sections of the same gear are measured in turn， and then the slope of the straight line is calculated by the coordinate method. The helical angle of helical gear is obtained. The gear measurement method based on laser displacement sensor can effectively improve the accuracy and efficiency of helical gear helical angle measurement， and is also applicable to the accurate measurement of helical gear errors.关键词：Helical cylindrical gear
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发布时间：2022-10-20 - 摘要：Rack is the key component of the rotary device of the overweight roadheader. Its performance directly affects the bearing capacity, impact resistance and seismic resistance of the rotary device, which determines the safety, stability, reliability and service life of the roadheader. The deep carburizing and quenching technology, structure and distortion control technology of the 32 mm large modulus rotary rack in the rotary device of the roadheader are studied in combination with the performance requirements, structural characteristics and technical difficulties of heat treatment. The results show that, by the multi-stage carburizing process with high intensity carburizing and diffusion, the depth of the carburizing layer of the rack is up to 0.5 mm,the bending deformation of rack is 0.8~1.4 mm by process equipment and process control, and the metallographic structure are effectively controlled.关键词：Large modulus
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发布时间：2022-10-20 - 摘要：Aiming at the actual working conditions of high temperature， high speed and heavy oil mist of the accessory transmission gear of aero engine， a set of the gear dynamic transmission error test system is designed and developed based on the principle of the quadruple subdivision of magnetic grid sensor. In this system， the real-time rotation angel of the driving gear and driven gear is respectively measured at the same time by magnetic grid sensor， through the high-speed data acquisition， storage devices of NI and the producer/consumer design pattern of LabVIEW for real-time acquisition and storage of the high-frequency data. Finally， the digital counting method is used to obtain the gear dynamic transmission error curve. The measuring speed of the testing system can reach 40 000 r/min， which is doubled the measurable speed of the previous test system， it can provide data support for vibration analysis and tooth surface design of higher-speed accessories transmission gear.关键词：Gear dynamic transmission error
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发布时间：2022-10-20 - 摘要：Calculated the gear pair normal backlash constant c according to definition and calculation method of gear pair normal backlash from GB/Z 18620.2—2008 at a given work center distance. One gear of the gear pair is fixed， the max rotation angle θ of the another rotatable gear is measured by using max rotation angle measure equipment. Gear pair normal backlash is acquired by product of gear pair normal backlash constant c and max rotation angle θ. Taking the measurement and calculation of the normal backlash of the gear pair of a balanced shaft assembly for an engine as an example， the equipment can be used to measure the normal backlash of gear pairs in the closed space is explained， the realization method for measure and calculation of the gear pair normal backlash introduced. The error source is explained and the error result is calculated. Compared with feeler gauge direct measure， the measured accuracy based on this method is verified. The normal backlash of the same mesh gear repeatedly is measured， the result consistency based on this method is verified.关键词：Gear pair
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发布时间：2022-10-20 - 摘要：Through the analysis of the chain failure mode， the main factors that causing the chain elongation is found. Through the validation on the acceleration-fatigue test rig， the chain using vanadinizing pins is more better than carbon-nitrogen and chromizing pins on the chain wear-resistant characteristics. After using vanadinizing pin chain， the problems of the engine project which has the chain severely worn issues is solved. The conclusions and test method has a certain kind of reference on the chain system development and application on the engine.关键词：Timing chain
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发布时间：2022-10-20
Development·Application
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