Dynamic characteristics analysis and experimental of differential dual drive servo feed system

2021 ◽  
pp. 095440622110179
Author(s):  
Hanwen Yu ◽  
Laigang Zhang ◽  
Chong Wang ◽  
Xianying Feng
Keyword(s):  
Degrees Of Freedom ◽  
Electromechanical Coupling ◽  
Simulation Analysis ◽  
Drive System ◽  
Ball Screw ◽  
Parameter Method ◽  
Feed Speed ◽  
Feed System ◽  
Stick Slip ◽  
Low Speed

This paper presents the design for a new differential-dual-drive low-speed micro-feed mechanism. The ‘nut rotary ball screw pair’ is the main driving component of the mechanism. The screw and nut are each driven by a servo motor and these motors rotate in the same direction at a similar speed. The nonlinear factors such as friction and backlash can lead to unstable behaviours such as stick-slip and oscillation of the feed system. We use the Euler–Bernoulli beam elements, which have axial and torsional degrees of freedom, to describe the axial and torsional vibration of the ball screw, and use the spring-lumped parameter method to analyse other components of the feed system. An electromechanical coupling dynamic model with nonlinear factors of friction and clearance is established. Through simulation analysis and experiment, the difference in response of single-drive and differential-dual-drive systems under the influence of friction and clearance is studied. The results show that the nonlinear factors of friction and clearance have an influence on the feed speed of single-drive and differential-dual-drive system, but the low-speed micro-feed performance of the differential-dual-drive system is evidently better than that of the single-drive system. In the experiment, under the condition of screw single drive and differential dual drive, the critical crawling velocities of the table are measured. The experimental results are consistent with the simulation results, which verifies that the established models are reasonable. This lays a foundation for the design and research of the controller.

scholarly journals Micro feed characteristic analysis of a new crawler guide rail dual drive servo system

2021 ◽  
Vol 104 (3) ◽  
pp. 003685042110313
Author(s):  
Hanwen Yu ◽  
Zhenzhong Zhang ◽  
Jifei Xing
Keyword(s):  
Servo System ◽  
Drive System ◽  
Parameter Method ◽  
Feed Speed ◽  
Nonlinear Friction ◽  
Variable Speed ◽  
Guide Rail ◽  
Characteristic Analysis ◽  
Feed System ◽  
Low Speed

This paper presents a new type of crawler guide rail dual drive micro feed servo system based on “crawler type” guide rail. Through the innovative design of the crawler guide rail and the change of the working mode, the table, and the crawler type movable rail are relatively static, and the influence of nonlinear friction in low-speed micro feed is eliminated, so that the system can have a lower stable speed limit and realize accurate micro feed control. The Euler-Bernoulli beam element with axial and torsional degrees of freedom is used to describe the axial and torsional vibrations of the ball screw, and the lumped parameter method is used to analyze other parts of the feed system, and the electromechanical coupling dynamic model considering the nonlinear friction is established. The transfer function block diagram is used to characterize the motion relationship of the crawler guide rail dual drive servo feed system. The response difference between the screw single drive system and the new crawler guide rail dual drive system is analyzed by simulation when feeding at constant or variable speed, and the influence of different feed speed on the dynamic performance of the system. The results show that the low speed micro feed performance of the new crawler guide rail dual drive servo system is obviously better than that of the screw single drive system under the condition of constant speed or variable speed.

scholarly journals Research on low-speed characteristics of differential double-drive feed system

2021 ◽  
Vol 12 (2) ◽  
pp. 791-802
Author(s):  
Zhaoguo Wang ◽  
Xianying Feng ◽  
Hongtao Yang ◽  
Huawei Jin
Keyword(s):  
Dynamic Models ◽  
Simulation Models ◽  
Ball Screw ◽  
Feed System ◽  
Low Speed ◽  
System A ◽  
Friction Models ◽  
Lugre Friction ◽  
Control Methodology ◽  
System Operating

Abstract. It is difficult to achieve high-precision control due to frictional nonlinearity by traditional linear control methodology for the classical drive feed system at low speed. Here, the double-drive differential feed system is proposed to reduce the influence of the nonlinear friction at the ball screw pair of a linear feed system operating at low speed. The dynamic models and the LuGre friction models of the classical drive feed system and the double-drive differential feed system are established, respectively. Based on these, the simulation models of the classical drive feed system and the double-drive differential feed system are established in MATLAB to study the critical creeping velocity of the table. Compared with the classical drive feed system, a lower stable velocity can be obtained for the table with the double-drive differential feed system, because the speed of both motors in the double-drive differential feed system is higher than the critical creeping speed of the classical drive feed system screw motor, thereby overcoming the influence of the Stribeck effect and avoiding the frictional nonlinearity at low speed.

Modeling and Simulation for the Feed System of CNC Machine

2014 ◽  
Vol 496-500 ◽  
pp. 1024-1027
Author(s):  
Qin Wu ◽  
Jian Jun Yang ◽  
Chun Li Lei
Keyword(s):  
Driving Force ◽  
Simulation Analysis ◽  
Multiple Solution ◽  
Ball Screw ◽  
Nonlinear Stiffness ◽  
Cnc Machine ◽  
Feed System ◽  
Damping Force ◽  
System Use ◽  
Linear And Nonlinear

Study the linear and nonlinear stiffness dynamic characteristics of ball screw in feed system. According to the structure and the stiffness of ball screw, considering the influence of damping force, elastic force, friction force, driving force and load, establish the dynamic model of feed system. Use Linz Ted- Poincare (L-P) Method of singular perturbation to solve the model, obtain the quadratic approximate solution of the free vibration, analyze the multiple solution phenomenon of the model, and also conduct the numerical simulation analysis for the model.

Study on Electromechanical Coupling Vibration of Simulation Technology Based on the Drive System

2013 ◽  
Vol 676 ◽  
pp. 289-292 ◽  
Author(s):  
Hong Ying Wang
Keyword(s):  
Degrees Of Freedom ◽  
Electromechanical Coupling ◽  
Dynamic Performance ◽  
Drive System ◽  
Coupling Vibration ◽  
Ac Drive ◽  
Mass Damper ◽  
Coupling Factors ◽  
Vibration Simulation

Study the mechanical and electrical system,according to the mechanical system of the coupling mechanics principle, the AC drive system is simplified as many degrees of freedom "spring - mass - damper" system,the quality of construction of three two-axis system,established the two shafts electromechanical coupling vibration mathematical model; Using the electromechanical coupling vibration simulation model, the parameters of the current regulator, damping, harmonic disturbances, gap and load disturbance of electromechanical coupling factors such as vibrations caused by dynamic process.Improve the dynamic performance of the system is significant, have the great value for the parameters of the system design and fault diagnosis on this study.

Dynamic characteristics and research on the dual-drive feed mechanism

2021 ◽  
pp. 095440622098419
Author(s):  
Hong Lu ◽  
Qi Liu ◽  
Xinbao Zhang ◽  
Jingui Yu ◽  
Haoyu Dou ◽  
...  
Keyword(s):  
Dynamic Characteristics ◽  
Contact Stiffness ◽  
Dynamic Performance ◽  
Industrial Robots ◽  
Numerical Control ◽  
Ball Screw ◽  
Axial Stiffness ◽  
Parameter Method ◽  
Feed System ◽  
Moving Parts

The dual-drive feed mechanism (DDFM) based on the drive at the center of gravity (DCG) principle has been widely adopted in computer numerical control (CNC) machines and industrial robots that require high precision and high stability. The friction force affected by feed rates and moving parts positions can change the contact stiffness of kinematic joints, which can further impact on dynamic characteristics of the DDFM and cause dual axes difference. Considering the contact stiffness of kinematic joints, this paper adopts the lumped parameter method to establish the general dynamic model of the DDFM. The equivalent axial stiffness of kinematic joint and feed system transmission stiffness are all derived regarding the influence of feed rates and moving parts positions. The dynamic experiments on the DDFM with different feed rates and moving parts positions are carried out to verify the proposed model. The results suggest that in the motion stage, the DDFM’s natural frequency is greater than that in the static stage, and behaves differently in different feed rates and moving parts positions. The axial contact stiffness value of the ball-screw and nut B can reach 0 when the feed rate increases. When the moving parts are in the middle position of the crossbeam, the DDFM is the most stable and the dynamic performance is the best.

scholarly journals Theoretical Calculation and Simulation Analysis of Axial Static Stiffness of Double-Nut Ball Screw with Heavy Load and High Precision

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Haitao Luo ◽  
Jia Fu ◽  
Lichuang Jiao ◽  
Fengqun Zhao
Keyword(s):  
Finite Element ◽  
Axial Load ◽  
Simulation Analysis ◽  
Hertzian Contact ◽  
Ball Screw ◽  
Deformation Model ◽  
Heavy Duty ◽  
Static Stiffness ◽  
Feed System ◽  
Friction Stir

Double-nut ball screws bear the action of bidirectional pretightening force, leading to the deformation of the contact area between the ball and the raceway. Under this condition, it is important to analyze and calculate the static stiffness of the ball screw. However, the conventional calculation method is inaccurate. Hence, a new method for the static stiffness analysis of a double-nut ball screw is proposed. Through the structural analysis of the ball screw and internal load distribution, a load deformation model was established based on the Hertzian contact theory. Through the load analysis of the ball screw, a static stiffness model of the ball screw was established and applied to a case study and a finite element simulation. The rigidity of THK double-nut ball screws used in the X-axis feed system of a high-stiffness heavy-duty friction stir welding robot (developed by the research group) was calculated. When the workload was lower than 1.1 × 104 N, the slope of the double-nut static stiffness curve increased significantly with the increase in the workload, and when the workload was greater than 1.1 × 104 N, its upward slope tended to stabilize. The simulated and experimental stiffness curves were in good agreement; when the external axial load was greater than 2.8 × 104 N, the stiffness value calculated using the finite element method gradually converged to the theoretical value; and when the axial load reached 3.0 × 104 N, the simulation and test curves matched well. The analysis method of the double-nut ball screw was found to be concise and accurate, and the stiffness curves calculated using the two methods were consistent. The simulation analysis of the static stiffness presented herein is expected to aid the design of double-nut ball screws of high-rigidity heavy-duty equipment.

scholarly journals An Electromechanical Co-Simulation Model Based on Lumped Parameter Model of Ball Screw Feed Drive System

2018 ◽  
Vol 237 ◽  
pp. 03007
Author(s):  
Liang Luo ◽  
Weimin Zhang ◽  
Haonan Sui ◽  
Jürgen Fleischer
Keyword(s):  
Simulation Model ◽  
High Speed ◽  
Drive System ◽  
Lumped Parameter Model ◽  
Ball Screw ◽  
Feed System ◽  
Feed Drive ◽  
Lumped Parameter ◽  
Feed Drive System ◽  
Screw Feed

The continuous search for efficiency put forward higher requests to the machine tool for high speed and high acceleration, which makes the large-size and lightweight-designed feed drive system more likely to produce vibration during high-speed and high-acceleration feed operation. Ball screw feed system is the most widely used linear drive system in the field of industrial automation. Electromechanical Co-Simulation for ball screw feed drive dynamics is an important technique for solving vibration problems occurs in the feed motion. In view of the shortcomings of the current dynamic simulation model in the study of vibration of ball screw feed drive system, taking a ball screw feed drive system test bench as an example, an electromechanical co-simulation model based on the lumped parameter model of ball screw feed drive system was built up in this paper. Firstly, based on the axial and rotation vibration integrated dynamic modeling method of ball screws, the lumped parameter model of ball screw feed system was established. Secondly, through the integration of the simulation model of semi-closed-loop cascade control system and the lumped parameter model of ball screw feed drive system, an electromechanical co-simulation model was built up. Simulation result shows that, the co-simulation model of ball screw feed drive system can predict the vibration occurs in the feed operation caused by the servo controller, ball screw feed system or the coupling between them.

Experimental Investigation on Thermal Characteristics of Hollow Ball Screw in Different Working Conditions

2013 ◽  
Vol 690-693 ◽  
pp. 3266-3270
Author(s):  
Yu Wang ◽  
Wei Guo Gao ◽  
Da Wei Zhang ◽  
Zhen Hong Sun
Keyword(s):  
Temperature Rise ◽  
Thermal Characteristics ◽  
Ball Screw ◽  
Feed Speed ◽  
Feed System ◽  
Position Accuracy ◽  
Cooling Strategy ◽  
Feeding Speed ◽  
The Right ◽  
Hollow Ball

The text takes Z-Axis of precision machine tool as study object, and proceed the thermal character's experiment of Z-Axis feed system in different working condition (different Cooling strategy, different Feeding speed, load or not). The data of experiment shows the higher of the feed speed, the more heat is generated. Position accuracy can be increase by apply the right load and load is nearly none business with temperature rise. Cooling strategy is nearly none business with temperature rise and may cause the discretization of position accuracy.

The Thermal Characteristics of the Ball Screw Feed System on a Gantry Machine Tool

2014 ◽  
Vol 490-491 ◽  
pp. 1008-1012
Author(s):  
Rui Jun Liang ◽  
Wen Hua Ye ◽  
Qun Qiang Chen ◽  
Xin Jie Zhao
Keyword(s):  
Temperature Field ◽  
Machine Tool ◽  
Thermal Equilibrium ◽  
Thermal Deformation ◽  
Thermal Structure ◽  
Ball Screw ◽  
Machining Accuracy ◽  
Feed Speed ◽  
Feed System ◽  
Gantry Machine Tool

With the increasing of machine tool feed speed, a large quantity of friction heat is generated on the ball screw system and will cause the temperature rising and thermal deformation along the ball screw that reduces the machining accuracy. The heat accumulated and dissipated are calculated to load to the established model of the Y feed system on a gantry machine tool. The stable temperature field at thermal equilibrium and the unstable temperature field before thermal equilibrium or with the variation of thermal load are gotten. From thermal structure analysis, the thermal deformation is derived. The FEM model is verified by the experiments carried out under the same condition with the simulation.

scholarly journals Design and implementation of speed fluctuation reduction for a ball screw feed system at low-speed operation

2020 ◽  
Vol 11 (1) ◽  
pp. 163-172
Author(s):  
Zhaoguo Wang ◽  
Xianying Feng ◽  
Fuxin Du ◽  
Hui Li ◽  
Zhe Su
Keyword(s):  
High Speed ◽  
Permanent Magnet Synchronous Motor ◽  
Servo System ◽  
Ball Screw ◽  
Motor Speed ◽  
Feed System ◽  
Low Velocity ◽  
Motor Torque ◽  
Low Speed ◽  
Speed Fluctuation

Abstract. In the high-precision servo feed system, when the permanent magnet synchronous motor (PMSM) is operated at low speed in the classical drive feed system (CDFS), the speed fluctuation caused by the motor torque harmonics seriously affects the speed smoothness of the servo system. In this paper, a novel double-drive differential feed system (DDFS) is proposed to effectively suppress the effect of torque harmonics of PMSM on speed fluctuation of the linear feed system at low-speed operation. Firstly, the effect of motor torque harmonics on motor speed for the DDFS is analyzed by the sensitivity function of the servo system, which indicates that the torque harmonics have little effect on the motor speed at high-speed operation. Then, in the DDFS, we make two motors rotate in the same direction at high speed and differentially synthesize at the ball screw to obtain low-velocity linear motion. Compared with the CDFS, the DDFS can suppress the effect of motor torque harmonics on speed fluctuation of the table and improve speed smoothness at low-speed operation.

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