最新刊期
期 12 ， 2020
- 摘要：Combining the surface topography model of pin tooth and cycloid tooth constructed by fractal theory，and the proposed film thickness formula of line contact lubricated with grease based on the Herschel-Bulkley model，the minimum film thickness in the meshing process of modified pin tooth and cycloid tooth is investigated. The position of minimum film thickness during meshing process is determined. The influence of the macroscopical design parameters and modification parameters of cycloid tooth on the minimum film thickness and lubrication state is analyzed. Using the basic parameters determined by empirical formula and elastohydrodynamic lubrication numerical calculation，the lubrication characteristics of cycloidal pinwheel drive is studied.关键词：Cycloidal pinwheel drive;Fractal theory;Tooth profile modification;Lubricating characteristic
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发布时间：2022-11-10 - 摘要：Aiming at the sliding phenomenon between the cycloidal gear and pinwheel in the actual meshing process of the cycloid pinwheel transmission，a novel cycloid tooth profile modeling method，in which using a sliding function to represent the slide between the pinwheel and the cycloidal gear in the cycloid pinwheel transmission，is proposed. Based on the differential geometry and gear meshing theory，the tooth profile equation of the rolling-sliding cycloidal gear is derived，the meshing function is determined，the calculation method of comprehensive curvature radius and contact stress of the rolling-sliding cycloidal gear are given. A new cycloid tooth profile，based on hypothetical sliding function which parameters are selected with experience，is constructed. The tooth profile，comprehensive curvature radius and contact stress of the new tooth profile and that of the standard cycloidal tooth profile are compared. A rolling-sliding cycloid gear is trial-produced and applied to the RV reducer，the accelerated fatigue test under 2.5 times load on the prototype of new RV reducer is completed. The deviation of the rolling-sliding cycloid tooth profile before and after the test is compared，and the result shows the correctness and feasibility of the new modeling method for the rolling-sliding cycloid tooth profile.关键词：Cycloidal gear;Comprehensive curvature radius;Contact stress;Finite element analysis;Accelerated fatigue life test
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发布时间：2022-11-10 - 摘要：The Overrunning Alternator Pulley （OAP） of automobile generator is more and more used because it can effectively improve the vibration of the front gear train of the automobile，thus increasing the service life of the gear train. Based on the analysis of the working principle of the OAP of the generator，according to the working mechanism of the OAP of a domestic generator，the virtual prototype model of the bench test of the OAP the automobile generator is constructed by using the multi-body dynamics simulation software RecurDyn. The validity of the calculation method is calculated by comparing with the test data，and the model can be used to realize its working，it is not suitable to calculate the dynamic index for measurement. Through the study of the factors affecting the bearing characteristics and the relationship between them，the direction of design improvement is provided. The research results play an important role in guiding the product design and improving the design level.关键词：Overrunning clutch;Virtual prototype;Contact;Dynamics simulation
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发布时间：2022-11-10 - 摘要：In order to study the influence of working conditions and structural parameters on the temperature and stress fields of the friction pair of the single cone ring synchronizer，the finite element analysis model of the thermal structure is established by Abaqus software in combination with the actual structure and working conditions of the synchronizer，and the temperature and stress fields in the shift process of synchronizer are analyzed by using the direct coupling method and the control variable method. The results show that，the temperature and stress increase with the increase of the speed difference，the sliding time and the direct pressure，and increasing direct pressure has a significant effect on it. The decrease of initial temperature does not change the temperature rise in the process of synchronous shifting，but the stress of the ring decreases significantly. The decrease of the cone angle of the friction reduces the temperature and stress，while the decrease of the inner diameter of the ring increases the temperature and stress under the same conditions. The temperature of the friction pair decreases along the axial and radial direction，and distributes uniformly along the circumferential direction.关键词：Synchronizer friction pair;Thermal-structural coupling;Temperature field;Stress field
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发布时间：2022-11-10 - 摘要：The 1T2R 2PUS-PU parallel mechanism with one suitable constrained branch has no unwanted parasitic motion occurred in the constraint directions，then reducing efficiently the control difficulty. Based on the topological characteristic analysis of mechanism，its equations of displacement and orientation，velocity，and acceleration analysis are derived by means of the vector method. With the aid of the singularity of Jacobi matrix，the possible singular configurations of mechanism are investigated. The orientation of end-effector output axis is depicted by using the azimuth and tilt angles. Introducing the evaluation indices for motion/force transmission performance of mechanism，the definitions and calculation methods of regular transmission orientational workspace （RTOW） are given. A constrained optimization model is constructed to formulate the design problem of dimensional parameters on the maximizing radius of RTOW，and particle swarm optimization and differential evolution algorithm are adopted to solve this problem. A case of dimensional optimization design is given to indicate that the proposed model and algorithm are effective and feasible.关键词：Parallel mechanism;Kinematic analysis;Orientational workspace;Dimensional synthesis;Constrained optimization design
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发布时间：2022-11-10 - 摘要：Taking two kinds of typical involute splines applied in the power split system as the research object，the theoretical analysis models of the load distribution factor in the tooth direction are established respectively，and the effects of load position，torque distribution and torsional rigidity of splines on the load distribution in the tooth direction are studied. The results show that，for the first kind of involute spline pair，with the increase of load distribution position and load distribution ratio，the maximum load distribution factor first decreases and then increases. There are optimal load position and optimal load distribution ratio to minimize the maximum load distribution factor，with the reduction ratio of 56.67% and 51.83% respectively. When the left torsional stiffness is 450×106 N/rad and the right torsional stiffness is 522×106 N/rad，the maximum load distribution factor reaches the minimum value of 2.08，and the maximum value increases by 31.8% compared with the minimum value. For the second involute spline pair，the maximum load distribution factor increases gradually with the increase of the left torque position，and the increase proportion is 14.36%，the influence of load distribution on the maximum load distribution factor is very small. With the increase of torsional rigidity，the maximum load distribution factor increases by 16.86%.关键词：Involute spline;Tooth load distribution;Power split
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发布时间：2022-11-10 - 摘要：A unified assembly condition formula is derived for planet gears，taking the NW planetary gear train as an example. Firstly，the minimum non-zero misalignment angle between the two teeth of compound planetary gears is determined. Secondly，according to the kinematics equation of the planetary gear mechanism，the rotation angle （the angle of the planet gear rotates about its own shaft） of the two independent planet gears are calculated separately，and the difference between the two rotation angle is used as the assembly misalignment angle. The planet gear（s） can be correctly assembled only if the assembly misalignment angle is an integer multiple of the minimum non-zero misalignment angle between the two teeth，so that a unified assembly condition formula is obtained for planet gear（s） with even or uneven distribution of all types of planetary gear mechanism. Finally，the assembly method of uneven distributed planet gears is introduced through two examples. The expression proposed expands and improves the theory of planet gear assembly，more wider ranges of gear teeth for the planetary gear train are available to select，and has certain theoretical guidance and engineering practical significance for the assembly and application of uneven distribution planet gear mechanism.关键词：Planet gear;Assembly condition;Non-evenly spaced;Evenly spaced
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发布时间：2022-11-10 - 摘要：Aiming at the reducer of pure electric vehicle，the gear churning power loss is analyzed based on ParticleWorks software，and the characteristics of gear churning power loss are explored. The orthogonal analysis method is used to analyze the range of the factors affecting the gear oil loss. The main factors affecting the gear churning power loss are speed，gear oil kinematic viscosity，oil depth，number of teeth，tooth width，gear helix angle and pressure angle，and the specific influence sensitivity of each factor is studied. Through ParticleWorks and Romax software，a transmission efficiency analysis model of the reducer is constructed and a transmission efficiency experiment is conducted. Through the comparison and analysis of the experiment and the transmission efficiency simulation，the feasibility and accuracy of the simulation model are verified. A new mean to study the transmission efficiency of the reducer of pure electric vehicle is provided.关键词：Reducer;Gear churning power loss;Transmission efficiency;Moving particle semi-implicit method
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发布时间：2022-11-10 - 摘要：Gearbox is one of the most critical and fault-prone components in a mechanical transmission system. Aiming at the fault diagnosis of gearbox，an Improved Local Mean Decomposition （ILMD） algorithm is proposed and applied to the extraction of fault features of gearbox. Firstly，in order to reduce the modal aliasing problem of the Local Mean Decomposition （LMD） algorithm，an optimized rational spline interpolation algorithm is introduced to the construction of the envelope curve. Then，the ILMD algorithm is used to decompose the measured vibration signal into a series of product functions （PF）. After that，the effective component which contains the most fault information among the decomposition results is selected based on the kurtosis. Finally，through the analysis of the envelope spectrum of the effective component，the diagnosis of gearbox fault is realized. The experimental results demonstrate that the proposed method can effectively suppress the mode mixing，and identify the gear wear failure precisely.关键词：Gearbox;Fault diagnosis;Rational spline interpolation;Improved local mean decomposition
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发布时间：2022-11-10
Theory·Reserach
- 摘要：Isomorphism identification is one of the indispensable processes in structure synthesis of planetary gear trains. It is of great significance for the creation of novel planetary gear train with excellent transmission characteristics. A new method for identifying isomorphism of planetary gear trains based on traversing loops is proposed. Firstly，a new method for describing the topological diagram basic characteristics of planetary gear trains by the new loop matrix is proposed. This matrix contains all the information of the topological structure of planetary gear trains. Then，the rule to traverse loops and its priority is defined，to make sure that there is the uniqueness of description. Then，the loop code，the loop sequence and loop degree of planetary gear trains are obtained based on the principle of improved Hamming number and the new loop matrix. By distinguishing whether the structural constants of the loop code，the loop sequence and loop degree are equal，the isomorphism of the planetary gear trains is identified. Finally，the validity and reliability of the method are verified by many examples.关键词：Planetary gear train;Traversing loop;Isomorphism identification;Improved loop matrix
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发布时间：2022-11-10 - 摘要：Aiming at the high precision of the transmission system of the scanning device in the cone-beam oral CT diagnostic equipment，the ordinary transmission device is difficult to meet its use requirements. The oral CT machine developed in China has high noise and low positioning accuracy，harmonic transmission has the advantages of smooth transmission and high transmission accuracy. Combined with the characteristics of planetary gear transmission with strong anti-shock and vibration capabilities，a composite harmonic transmission device for cone beam oral CT scanning device is designed. Three-dimensional modeling is performed using the three-dimensional design software SolidWorks，and Adams kinetic simulation software is introduced for simulation experiments. The results show that the design has fast response，smooth rotation，high transmission accuracy，and meets medical requirements.关键词：Oral CT;Transmission device;Planetary gear;Harmonic transmission
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发布时间：2022-11-10 - 摘要：Six-bar linkages have a wide range application in industry and daily life. To ensure the design accuracy and improve design efficiency，an integrated design method of synthesis and analysis for bi-objective path of six-bar linkages is put forward. Firstly，based on the set of nonlinear equations of bi-objective path for six-bar linkage，five general precision points is the largest number that can be achieved precision bi-objective path of six-bar linkage. Then，the regeneration homotopy algorithm is used to reach the fast solution of the synthesis equations，this algorithm is easy and does not involve the complex elimination process and the problem of selecting the initial value. In order to screen out the mechanism with practical engineering application value in the synthesized mechanism，the motion defect determination of six-bar mechanism is carried out based on the 2R Assur group cross product coincidence，the kinematics analysis of the loop equation of the six-bar mechanism is established. Finally，the example of opening-closing linkage for patient rehabilitation transfer device verifies the correctness and effectiveness of the proposed theory and methodologies.关键词：Six-bar linkage;Path synthesis;Regeneration homotopy algorithm;Kinematic analysis
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发布时间：2022-11-10 - 摘要：Optimum design about geometric parameters，i.e. link lengths is one of the most important issues in the field of parallel robots. In order to facilitate optimization of the geometric parameters of 5R parallel robot，the following steps are given. First，the planar design spaces of the 5R symmetric parallel robot are drawn. Then，using the concept of transmission angle，the good transmission workspace （GTW） and global transmission index （GTI） are defined by reasonable range of LTI（Local Transmission Index）. The GTW and GTI atlas are given in the planar design space. Finally，the optimization design process is given，and the optimum design of planar 5R symmetric parallel manipulator is conducted based on the performance atlases. As long as the transmission angle is kept within a certain range，the optimized robot not only can meet the needs of work，but also has excellent performance on motion and force transmission.关键词：Parallel robot;Optimum design;Motion and force transmissibility;Transmission angle;GTW;GTI
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发布时间：2022-11-10 - 摘要：A simple and symmetrical parallel mechanism with three translations is designed according to the theory and method of topological design of parallel mechanism based on Position and Orientation Characteristic （POC） equation. The topological characteristics of mechanism，such as position and orientation characteristic set，degree of freedom and coupling degree，are calculated respectively by POC equation to verify the kinematics characteristics of the mechanism with three translations. The kinematics equation of the mechanism is established，and the analytical expression of positive and inverse kinematics solution of the mechanism are derived，the singularity，workspace and dexterity of the mechanism are studied. Finally，a multi-objective optimization design model is established，with elite retention strategy of rapid and dominate the multi-objective optimization algorithm （NSGA-Ⅱ），the scale synthesis of the structural parameters is carried out，a set of Pareto optimal solutions are obtained by optimization. The results show that the workspace volume and global dexterity can’t be maximized at the same time. Pareto optimal solution can be selected according to the actual needs to meet the needs of the two goals.关键词：Position and orientation characteristic set;Parallel mechanism;Workspace;Dexterity;Multiobjective optimization
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发布时间：2022-11-10 - 摘要：On the basis of the locomotion mechanism and biological characteristic of the human knee joint，a structural mapping model of bionic knee joint mechanism is established through equivalent mapping and bionic design method which is based on a C4S2 plane tensegrity structure. By using the mechanism configuration analysis method，the stability of the mechanism is verified. The inverse dynamics method is used to match the spring stiffness and solve the kinematics through the rigid-flexible coupling characteristics of the human knee joint. The mechanism is simulated by Adams. The bionic knee joint mechanism can realize the motion range of human-like knee joint movement by the simulation results. Compared with the simulation results and the theoretical calculation results，the simulation results and the test results，the validity and feasibility of the proposed theory and design of the bionic knee joint mechanism are verified. The bioinspired knee mechanism based on tensegrity structure which is realized the flexibility，semi-automatic recovery and self-locking meet the requirements of bionic design.关键词：Human knee joint mechanism;Tensegrity;Equivalent mapping;Bionic knee joint mechanism;Semi-automatic recovery
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发布时间：2022-11-10 - 摘要：Taking the humanoid manipulator as the research object and its workspace is analyzed. The screw theory is used to establish the forward kinematics model of the manipulator. At the base of Monte Carlo method，the workspace point-cloud of the manipulator is obtained. The method of combining partitioning by angle method with two-parameter arctangent function is employed to extract the boundary points of the workspace. The least square method is applied to fit the extracted boundary points. The workspace of the manipulator is obtained. The results of the Matlab simulation show that the extraction effect of boundary points is good，and that fitting error of the curve is small，which lays a foundation for the subsequent trajectory planning and motion control of the humanoid manipulator. On the basis，taking the handling of objects as a study case，the collaborative work of the double humanoid manipulator is briefly analyzed.关键词：Humanoid manipulator;Screw theory;Workspace;Monte Carlo method;Boundary extraction
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发布时间：2022-11-10 - 摘要：A new 3-UU/UPU+2P double-layer hybrid mechanism is proposed in view of the characteristics of the hybrid mechanism having both the advantages of the serial and parallel mechanisms. Firstly，the structural characteristics of the mechanism are described in detail，and a dynamic and static coordinate system is constructed. Secondly，the degree of freedom of the mechanism is analyzed based on the spiral theory，and the degree of freedom is verified by using the modified G-K formula. It is concluded that the mechanism has 3 degrees of freedom and belongs to a non-transient mechanism. Then，based on the kinematic characteristics of the mechanism，the forward and inverse solution models of the kinematics of the mechanism are established，and the differential solution method of symbolic operation is used to analyze the forward and velocity solutions of the mechanism. The change curves of kinematics model are obtained through specific numerical examples，and the theoretical calculation results are compared with Adams simulation results to verify the correctness of the kinematics model. Finally，the workspace of the mechanism is analyzed based on Monte Carlo method，which provides theoretical basis for the configuration design and practical application of the mechanism. The research results show that the mechanism has a large continuous and symmetrical workspace.关键词：Hybrid mechanism;Kinematics;Monte Carlo method;Workspace
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发布时间：2022-11-10 - 摘要：The wear and deformation of gear profile will change the contact ratio，which will affect the continuity and bearing capacity of gear transmission. In order to detect the change of contact ratio in time，the detection system of gear transmission is designed. The detection system consists of gear transmission detection device and data analysis software. The industrial camera is used to capture the moving image of gear meshing，and image analysis is carried out based on the digital speckle correlation method，and the relevant parameters and contact ratio of gear mechanism are measured. The detection system can check the contact ratio of different types of gear transmission，with fast detection speed，high accuracy and convenient use. It provides a technical reference for gear design，processing and detection.关键词：Gear;Contact ratio;Digital speckle correlation method;Detection
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发布时间：2022-11-10
Design· Calculation
- 摘要：To fulfill the design goal of acceleration performance of a power-split hybrid vehicle，constraint matrices of all possible configurations of power-split hybrid powertrain system that can be constructed by two-planetary-gear system are derived and screened. A systematic solution to the maximum output torque of all types of two planetary gear power-split systems is introduced. Base on the solution，the 100 km acceleration performance of the derived configurations are simulated，so that the optimal configuration is found.关键词：Power-split;Hybrid powertrain system;Constraint matrix;Acceleration performance
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发布时间：2022-11-10 - 摘要：The main drive growth box of high speed wire finishing mill adopts the structure of cylindrical roller bearing and deep groove ball bearing as the support of gear shaft. Because the outer ring of the ball bearing is not radial constrained，running in a floating state（floating bearing）. The growth box is used for less than one year and the outer ring of the ball bearing is broken. After field investigation，optical microscope and electron microscope observation，bearing material composition and metallographic structure analysis，and bearing outer ring finite element simulation，it can be confirmed that the direct reason for the fracture of floating bearing outer ring is that the stress of floating outer ring is about 33.3% larger than that of fixed outer ring，which results in the excessive stress of the outer ring. Secondly，serious spalling and electric erosion damage occur in the bearing raceway，which causes great stress concentration in the raceway and causes the fracture of the outer ring. Aiming at above problem，the improvement measures are put forward关键词：Failure analysis;Growth box;Rolling bearing;Outer ring fracture
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发布时间：2022-11-10 - 摘要：In order to study the vibration response of gearbox bearings under fault conditions of high-speed train，based on Hertz contact theory，considering the spalling failure on the outer ring raceway of the bearing，and by using the 3D modeling software SolidWorks and dynamics software RecurDyn，a dynamical model of high-speed train gearbox bearing with spalling fault is established. Through the simulation analysis of the bearing，it can be seen that when the spalling failure on the outer ring raceway occurs，the angular velocity of the roller appears periodic mutation，resulting in slippage. The impact from the failure of the roller and outer ring raceway is transmitted to the cage，which reduces the stability. The vibration acceleration spectrum of the outer ring has peaks at 1 and 2 times the characteristic frequency of the outer ring. According to theoretical analysis，it can be judged that the outer ring is faulty. The contact force between the outer ring and the roller will increase and decrease periodically at the fault.关键词：High-speed train;Gearbox bearing;Spalling failure;Vibration response
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发布时间：2022-11-10 - 摘要：In order to analyze the dynamic characteristics of locomotive traction gear transmission system under different operating conditions，taking a certain type of locomotive traction gearbox as the research object，through the Simpack multi-body dynamics software，the time-varying meshing stiffness，damping，friction and other internal excitations of the gear meshing transmission process are considered to establish a traction gear pair dynamics model. Under the two typical working conditions of low speed and high speed，the dynamic characteristics of the driven gear are compared and the amplitude-frequency characteristic curve of the angular acceleration of the torsional vibration of the driven gear is obtained by Fourier transform （FFT）. The accuracy of the dynamics model of the traction gear pair is verified through the above studies，which provides a theoretical basis for the structural optimization design of the gearbox model and the study of the tooth modification of the traction gear.关键词：Locomotive traction gear;Multi-body dynamics;Amplitude-frequency characteristic;Simpack
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发布时间：2022-11-10 - 摘要：Gearbox is the key transmission part of wind turbine. It bears complex non-stationary load for a long time，and is prone to crack，teeth broken，wear and other gear faults，resulting in safety accidents and economic losses. It is of great significance to diagnose the faults. In view of the problem that the traditional spectrum analysis method can't meet the fault diagnosis of the wind turbine gearbox under nonstationary condition，the order analysis method is used to study the fault diagnosis of the gearbox. The basic principle of the order analysis method is analyzed，and the characteristic order of the gearbox is deduced and summarized. Finally，the real wind field data is analyzed by the order analysis method，and the fault in gearbox is identified accurately.关键词：Wind turbine;Gearbox;Order analysis;Nonstationary;Fault diagnosis
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发布时间：2022-11-10
Test·Analysis
- 摘要：Aiming at the problem of extracting characteristic frequency of flexible thin-walled bearings，a feature frequency extraction algorithm combining principal component analysis （PCA） and multi-point optimally adjusted minimum entropy deconvolution （MOMEDA） is proposed. In the algorithm，PCA is used to perform noise reduction processing on the original signal to obtain a reconstructed signal. The multipoint kurtosis （MKurt） is used to extract the period of the periodic shock signal in the reconstructed signal，and the theoretical period is corrected to obtain an accurate deconvolution period，enhance the reconstructed signal through MOMEDA，highlight its periodic impact，and extract the characteristic frequency more effectively. This method is applied to the fault feature frequency extraction of flexible thin-walled bearings，and compared with the maximum correlation kurtosis deconvolution （MCKD） algorithm. The results show that this method can separate bearing fault shocks from periodic shocks caused by the alternation of the bearing's long and short axes，eliminate the interference of such normal periodic shocks，and effectively extract the fault characteristic frequency in the signal. The effect is better than the maximum correlation kurtosis deconvolution algorithm.关键词：PCA;MOMEDA;Multipoint kurtosis;Feature frequency extraction
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发布时间：2022-11-10 - 摘要：Compared with developed countries，China's industrial software development is still relatively backward，especially gear transmission design and analysis software. With the development of industrial internet and industrial APP，China's industrial software development will usher in a climax. The meshing stiffness and LTCA are very important for the dynamics analysis of gear transmission system. For this，based on SYSWARE.IDE industrial internet platform，the meshing information of tooth surface is analyzed by Ease-off difference tooth surface topology，and the cylindrical gear LTCA industrial APP is developed. By example，topological modified gradient diagram，contact line waterfall diagram，transmission error curve，time-varying meshing stiffness，change curve of load transmission error，load distribution state of tooth surface，load sharing ratio between teeth and other tooth surface information are output.关键词：SYSWARE.IDE;Ease-off difference tooth surface;Meshing stiffness with time varying;LTCA;Industrial APP
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发布时间：2022-11-10 - 摘要：Taking the reducer for robot as the research object，a reducer test device composed of drive system，mechanical system，control system and data acquisition system is developed to test its mechanical transmission performance. In the process of testing，because of the traditional test method is difficult to capture the instantaneous change of the data，this is not conducive to the study of precision gear reducer. In order to solve this problem，the solving method is put forward. The software system based on JUCE libraries is designed，combined with the movement control cards of data transmission，the performance test of speed reducer is finished. The results show that the test system can quickly and accurately measure the transmission performance of the reducer，and it is expected to analyze and optimize to improve the overall performance of the reducer.关键词：Reducer;Test device;Transmission performance;JUCE library
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发布时间：2022-11-10 - 摘要：The lubrication state has a great influence on the wear resistance of the ordinary industrial roller chain. The main factors affecting the wear resistance of the ordinary pre-lubricating roller chain are summarized starting with the movement characteristics，wear principle and lubrication condition of the roller chain，combining with the wear resistance bench test，customer feedback and personal experience of the chain，and concludes that the meshing impact，vibration，force condition and rotation speed of the chain will affect the storage of grease in the chain，thus affecting the wear resistance of the chain，while the machining precision，surface state and heat treatment process of the chain parts will also affect the wear resistance of the chain.关键词：Wear;Pre-lubricating;Polygonal effect;Meshing impact;Vibration
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发布时间：2022-11-10
Development·Application
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