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Author

Peng Qin

Bio: Peng Qin is an academic researcher from Beijing University of Technology. The author has contributed to research in topics: Tuned mass damper & Machining. The author has co-authored 6 publications.

Papers
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Journal Article•DOI•
Min Wang1, Peng Qin1, Tao Zan1, Xiangsheng Gao1, Bisheng Han1, Yanlin Zhang •
TL;DR: This paper improves the optimal chatter control through a more accurate modeling method which considers the cutting tool as a cantilever Euler–Bernoulli beam and the TMD as a two degrees of freedom system including translation vibration and rotation vibration of the mass block.

5 citations

Journal Article•DOI•
TL;DR: In this article, a feed rate variation strategy is proposed for the ball head end milling process of the semi-conical shell workpiece, which is a special kind of thin-wall part that is commonly used in aerospace and mold industries.
Abstract: The semi-conical shell workpiece is a special kind of thin-wall part that is commonly used in aerospace and mold industries. Due to the special stiffness distribution and weak rigidity for the area with a large radius, the machining quality of the semi-conical shell is sensitive to both cutting force and vibration. Conventionally, constant conservative machining parameters are chosen to ensure the workpiece deformation and surface quality, which will reduce the machining efficiency. Based on the cutting force and vibration response simulation of the whole milling process. A feed rate variation strategy is proposed for the ball head end milling process of the semi-conical shell workpiece. The cutting force, dynamic performance and stability prediction are obtained considering the shape and boundary conditions of the workpiece and the contour tool path of the milling process. Variable feed rate is used in the milling simulation to find the harmony between machining quality and efficiency. User-defined vibration amplitude and another user-defined cutting force threshold are used to find the optimal feed rate for each simulation segment. Both continuous and discrete feed rate variation strategies are proposed, and the improved discrete feed rate variation is applied in the milling experiment. About 25% of the consumed time is saved with almost the same machining quality by the experimental results.

3 citations

Journal Article•DOI•
TL;DR: In this paper, a multiple distribution tuned mass damper (MDTMD) vibration control technique was proposed by attaching a series of optimized tuned mass dampers to each optimal position of workpiece.
Abstract: Considering the complexity geometry and thin wall feature, the semiconical shell workpiece will induce complicated and intense vibration in the milling process leading to poor surface quality and large machining deformation. In order to suppress the vibration, this paper focused on the semiconical shell workpiece and proposed a multiple distribution tuned mass damper (MDTMD) vibration control technique by attaching a series of optimized tuned mass dampers (TMD) to each optimal position of workpiece. The vibration characteristics and modal shapes of workpiece were obtained with the use of spectro-geometric-Ritz method (SGM) and the dynamic model of workpiece with MDTMD was established. A novel design of TMD was proposed. The optimal parameters and positions of each TMD were determined simultaneously using numerical optimization algorithm based on the modal summation method. Theoretical studies and experiment results shown that the proposed MDTMD method can remarkably improve the dynamic stiffness of the workpiece. The performance of vibration suppression is further verified in the impact tests and milling experiments.

1 citations

Patent•
16 Apr 2019
TL;DR: In this paper, a laminating type damping mechanism based on a tuned mass damper is described, where a number of upper part mass blocks are selected to roughly adjust the control range effect of the damping.
Abstract: The invention belongs to the technical field of damping, and particularly relates to a laminating type damping mechanism based on a tuned mass damper. The damping mechanism can only comprise one laminating type tuned mass damper and can further comprise a plurality of laminating type tuned mass dampers. A different number of upper part mass blocks are selected to roughly adjust the control range effect of the damping mechanism, and a nut is rotated and screwed to finely adjust the control range effect of the damping mechanism. According to the laminating type damping mechanism based on the tuned mass damper, the structure is simple and compact, precise control over the position of a control point can be realized, the adjustable control range is large, two-level adjustment can be realized,recording and repeated operation can be carried out conveniently, and the damping effect and the adaptability are good.
Proceedings Article•DOI•
01 Jan 2020
TL;DR: The efficiency of feed speed variation was studied, the optimal control parameters for chatter suppression were proposed and the improvement of stability limit was verified by the Simulink software.
Abstract: Turning operation is one of the most widely used machining process but its machining efficiency often subjected to the chatter phenomenon. In order to suppress the chatter, this paper investigated the influence of feed speed on the chatter stability and proposed a feed speed variation method. The regenerative chatter mechanisms of two different turning operations were analyzed in detail namely orthogonal and cylindrical turning operation. The efficiency of feed speed variation was studied, the optimal control parameters for chatter suppression were proposed and the improvement of stability limit was verified by the Simulink software.

Cited by
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Journal Article•DOI•
TL;DR: In this paper , a tunable and parametric, digital design of a large length to diameter boring bar is presented using Timoshenko beam elements and the effects that the TMD head has on the dynamics of the assembled boring bar-TMD system is modeled using a derived analytical expression.
Abstract: Slender single point boring tools are damped with tuned mass dampers (TMD) to increase their resistance against chatter. A TMD with fixed parameters may weaken its effectiveness when it is coupled with spindles or bars with different lengths. This paper presents a tunable and parametric, digital design of boring bars. The large length to diameter boring bar is modeled using Timoshenko beam elements and the effects that the TMD head has on the dynamics of the assembled boring bar-TMD system is modeled using a derived analytical expression. A universal TMD head that consists of a carbide mass, oil pocket, and two rubber O rings with experimentally calibrated stiffness and damping as a function of compression is designed. The boring bar has an internal compression shaft that can be pressed against the O ring to vary its stiffness using an integrated power screw. The complete TMD boring bar system is mathematically modeled to determine the Frequency Response Function (FRF) including the required TMD natural frequency and damping ratio to maximize the chatter-free depth of cut. The digital model is verified by comparing the simulated and experimentally measured FRF of the TMD bars. The bars are also tested in boring experiments successfully.

2 citations

Journal Article•DOI•
Wenkai Zhao, Rongyi Li, Xianglin Liu, Jun Ni, Libo Zhao 
01 Jun 2023-Machines
TL;DR: In this paper , a digital twin system for controlling processing errors in thin-walled parts was built using a microservices architecture, mainly targeting the dynamic characteristics analysis knowledge base of thin-wall parts, providing guidance for the digital transformation and upgrading of CNC machine tools and the optimization of processing technology based on digital twin technology.
Abstract: In the intelligent optimization process of aerospace thin-walled parts, there are issues such as solidification of core knowledge base, high system coupling degree, and real-time evaluation and optimization feedback required for the knowledge base. These problems make it difficult to expand the functions of the digital twin system and meet the growing processing needs, ultimately hindering the application of digital twin technology. To address these issues, a digital twin system for controlling processing errors in thin-walled parts was built using a microservices architecture. In addition, a method for building a digital twin system at the processing unit level with the best coupling degree was proposed, mainly targeting the dynamic characteristics analysis knowledge base of thin-walled parts. Furthermore, to meet the requirements for backward compatibility of the processing unit level digital twin system, a comprehensive solution including the construction, operation, evaluation, optimization, and visualization of a knowledge base for the dynamic characteristics of the processing unit was proposed, providing guidance for the digital transformation and upgrading of CNC machine tools and the optimization of processing technology based on digital twin technology.
Journal Article•DOI•
TL;DR: In this article , the counterweight of the excavator is designed as a non-linear tuned mass of tuned mass damper (TMD) system to reduce body vibration in order to improve the performance of the vehicle body.
Abstract: When driving and working, the engine, working equipment and uneven road sur-face will cause severe vibrations to the wheeled excavator, 1which can affect efficiency and comfort. This paper discusses various patents and presents a new method of vibration reduction for excavators. The purpose of the research is to design the counterweight of the excavator as tuned mass of tuned mass damper (TMD) to reduce body vibration. The recent patents of TMD were investigated in this research. In this paper, the coun-terweight of the excavator is designed as a non-linear TMD system. The vibration models were established under driving and crushing conditions, respectively. The vibration response of the vehicle body was calculated and analyzed through MATLAB/Simulink under driving and crush-ing conditions. Finally, the damping characteristics of the TMD system were discussed. The vibration of the car body can be reduced by TMD. 2The improvement rates in ver-tical acceleration were 8.05%, 11.85% and 11.15% for the three classes of road surfaces for the driving conditions. The improvement rates of 3vertical acceleration for the three powers of crushing conditions are 16.18%, 18.32% and 23.48%, respectively. The vibration damping performance of the excavator was effectively improved by TMD in the main working conditions. The variation of body vertical acceleration with TMD parameters indicates the existence of optimal damping characteristics parameters for the TMD system at a fixed road surface and vehicle speed.
Journal Article•DOI•
TL;DR: In this article , the influence of cutting speed and cutting depth on cutting chatter was studied by ultrasonic elliptical vibration cutting experiment of tungsten heavy alloy, and the influence on cutting surface morphology and diamond tool wear was studied.
Abstract: Ultrasonic elliptical vibration cutting has a wide range of applications in the field of precision cutting of difficult-to-machine metal materials. However, due to its intermittent cutting characteristics and the weak rigidity of the horn, cutting chatter is prone to occur during its cutting process, which has an important impact on cutting surface quality and tool wear. In this paper, the rigid/viscoplastic rod model is used to simulate the horn in the ultrasonic elliptical vibration cutting device, and the influence factors of the amplitude-frequency response of the horn are analyzed. The influence of cutting speed and cutting depth on cutting chatter was studied by ultrasonic elliptical vibration cutting experiment of tungsten heavy alloy, and the influence of cutting chatter on cutting surface morphology and diamond tool wear was studied. The research shows that cutting speed will change the excitation frequency of the horn, and reasonable cutting speed can inhibit the occurrence of cutting chatter and avoid resonance of the horn. The cutting depth will affect the excitation amplitude and amplify the vibration amplitude when chatter or resonance occurs. The experimental results show that in ultrasonic elliptical vibration cutting of heavy tungsten alloy, chatter suppression can significantly improve the quality of the cutting surface and reduce the wear of diamond tools.
Journal Article•DOI•
TL;DR: In this paper , an analysis of the chip morphology is presented using Deform 2D application, a finite element simulation -a comparative analysis of chip formation was performed when the value of the clearance angle varies.
Abstract: Abstract At this time, there is a significant interest in the chip shape and formation at the international level, an issue studied based on mathematical calculations, experiments, and finite element analysis. The analysis of the chip formation process showed that the thickness of the undetached chip also varies according to the rake angle of the cutting tool, and using 3D models to analyze the chip formation process demonstrates this fact. Following the research, a study was conducted in which an analysis of the chip morphology is presented. Using Deform 2D application, a finite element simulation - a comparative analysis of the chip formation was performed when the value of the clearance angle varies. The increasing variety of cutting radius values has an influence on the way the chips are formed in terms of thickness, which generate differences in its shape. Following the study, a series of conclusions and own findings emerged that with the increase of the cutting-edge radius, the stress distribution is radial over a greater area of the part, reason for which the deformation of the chip is smaller. Arguments have also been made on distribution of the temperature, which is directly influenced by the shape of the tool, influencing the temperature of the generated chip. The results also show that with the increase of the cutting-edge radius of the tool, there is a tendency for the detached chip to settle.