Dynamic Characteristic Optimization of Ball Screw Feed Drive in Machine Tool Based on Modal Extraction of State Space Model

Abstract

The accurate prediction and research about the dynamic characteristic of machine tool during the design process are essential to develop high-performance machines. In order to consider the effect of mechanical modal characteristics on the whole dynamic performance and servo controller of ball screw feed drive fully, the modal characteristics of mechanical transmission are extracted and solved based on reduced state space matrix of ball screw feed system, which is also easy for integration with servo control model. On this basis, the step-by-step optimization method from the global to the local is proposed to optimize the servo controller and overall dynamic performance of ball screw feed drive. This step-by-step optimization method is as follows: first, the global initial optimal tuning of servo controller parameters under the influence of structure modal characteristics is originally realized through the analytic derivation of servo controller based on the extraction of state space modal characteristics. Second, the integrated model of the feed drive system is established. Finally, based on the above global optimization results, the overall dynamic performance, and the servo parameters of the feed drive system under the influence of the modal characteristics are further studied and optimized locally. Taking the ball screw feed drive studied in this paper like the example, its rise time and the settling time of step response are 0.089 and 0.104s before optimization, while these reduce to 0.038 and 0.092s after optimization. Its dynamic response performance after optimization is much better. The optimization result is also validated by the test: the rise time and the settling time by the test are 0.042 and 0.094s, which are close to that from the simulation. Also, the consistency of step response curves from experiment and simulation as well. All these show that: this prediction and optimization method of overall dynamic performance considering the modal characteristic influence of mechanical transmission fully is correct and reliable.INDEX TERMS Ball screw feed drive in machine tool, dynamic characteristic, servo parameters, modal property, state space, step-by-step optimization method from the global to the local.

Principles and Methods of Servomotor Control: Comparative Analysis and Applications

“…The main technical characteristics of servomotors are as follows [18,[52][53][54][55][56][57]: Motors with the function of maintaining a constant rotational speed are also used in laboratory setups of a digital twin of a wind generator [49], as well as in diagnosing damage to bearings [50,51] depicted in Figure 3a,b. Motor control is carried out using a frequency converter, allowing the selection of an appropriate motor control mode, adjustment of controller settings for different operating conditions, calibration of control to eliminate malfunctions, and more.…”

“…The main technical characteristics of servomotors are as follows [18,[52][53][54][55][56][57]: For example, in bearing fault diagnosis setup, discrete motor control is used to maintain a constant rotational speed. The use of a potentiometer to set an analog speed signal is not appropriate because there is a high probability of additional disturbances that would affect the rotational speed of the output shaft.…”

Optimization Analysis of Structural Parameters for Ball Screw Precision Retention Based on Advanced Neural Fuzzy Network

“…To date, studies on the precision loss of ball screws due to sliding and rolling motion have typically focused on kinematic and static analyses [1][2][3][4][5][6] or creep theory [7,8]. By combining sliding motion analysis with Archard theory [9], a ball screw precision loss model for analyzing sliding motion behavior was previously established [10][11][12][13].…”

“…Previously derived precision loss characteristics have laid the foundation for the optimized design of the ball screw for precision retention. Thus far, studies on the optimization of structural parameters of the ball screw have been limited to the transmission efficiency [3][4], stiffness [1,14], servo structure [15,16], preload [17] and active suspension [18]. Based on data from experimental studies of the ball screw actuator, Zhao et al [18] proposed an active suspension system with a novel double vibration reduction structure.…”

Vibration Suppression and Over-Quadrant Error Mitigation Methods for a Ball-Screw Driven Servo System With Dual-Position Feedback

“…Positioning systems using rotary permanent magnet synchronous motors (PMSMs) and mechanical power transmission systems with ball-screw have been widely used in various applications such as numerical control (NC) machine, industrial robots and factory automation, for their advantageous features such as increased reliability and reduced cost [1]- [3]. In manufacturing procedures, it is a very important issue to improve the accuracy and dynamic performance of position control thus to achieve high manufacturing quality.…”