Aiming at the problem of acceleration and jerk fluctuation caused by the discontinuity at the corner of the tool path in the continuous short-line machining process, a real-time corner smoothing and interpolation algo...
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Aiming at the problem of acceleration and jerk fluctuation caused by the discontinuity at the corner of the tool path in the continuous short-line machining process, a real-time corner smoothing and interpolation algorithm for realizing the continuous motion of the tool axis jerk is proposed. In the corner smoothing process, the C-3 continuity of tool path is realized by constructing a symmetrical PH transition curve satisfying the maximum approximation error constraint between adjacent short lines. In the interpolation process, based on the flexible acceleration and deceleration control method, the feed rate, chord error, acceleration, and jerk constraints are considered. For the smooth C-3 continuous path, the acceleration and deceleration profile with jerk-continuous is used for velocity planning and interpolation, and the continuous motion of the tool axis jerk is realized. In this paper, the proposed method is compared and analyzed with the C-2 continuous algorithm and the traditional point-to-point interpolation algorithm through simulation and experiment for the same tool path. The results show that the jerk fluctuation of the proposed algorithm is reduced by 60.36% on average compared with the C-2 continuous algorithm, and the processing time is reduced by 19.5% compared with the point-to-point interpolation algorithm. It proves that the proposed algorithm can effectively reduce the vibration of the machine tool and improve the processing efficiency.
interpolation algorithm is the critical algorithm to achieve good dynamic performance of machine tools. However, due to complex kinematic constraints and calculation conditions, high-order continuous inter-polation al...
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interpolation algorithm is the critical algorithm to achieve good dynamic performance of machine tools. However, due to complex kinematic constraints and calculation conditions, high-order continuous inter-polation algorithms for six-axis machine tools are relatively rare in the literature, although they can greatly improve motion stability, reduce motion impact, and inspire motion performance. This paper develops an interpolation algorithm with jerk continuity for six-axis machine tools. A C3 continuity corner smoothing method of six-axis path is achieved by locally inserting two specially designed symmetrical quintic Bezier curves into the transition corners of linear commands. The pose in the six-axis path is converted to Euler angle with three parameters, and the synchronization of the position and pose are mathematically guar-anteed at the junctions of the linear and curve segments. The proposed corner smoothing method can calculate all control points of Bezier curves under the constraints of approximation error and path curvature analytically, which makes it suitable for online calculation. A quintic-polynomial feedrate schedule is uti-lized to meet the jerk continuity of the motion, and the concept of equivalent jerk is proposed to simplify the schedule calculation and smooth the velocity curve. In this way, the jerk continuity of the algorithm is achieved both at the geometric level and the feedrate level. The developed algorithm is verified to have more advantages than low-order continuous algorithms by simulation and comparison, and can improve the motion continuity of six-axis machine tools.& COPY;2023 CIRP.
With the increasing penetration of new energy and power electronic equipment in the power grid, the operation of the power system is characterized by power electronics, which puts forward new requirements for the acce...
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The B-spline curve interpolation algorithm based on S-curve acceleration/deceleration (ACC/DEC) with interference pre-treatment is proposed to achieve a smooth transition of feed-rate, and to reduce the impact with ac...
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The B-spline curve interpolation algorithm based on S-curve acceleration/deceleration (ACC/DEC) with interference pre-treatment is proposed to achieve a smooth transition of feed-rate, and to reduce the impact with acceleration mutation in Computer Numerical Control (CNC) machining. According to the demand of chord error, the algorithm divides a B-spline curve by velocity cusps. The interference points of the whole curve can be found out by using the S-curve ACC/DEC calculation for the velocity cusps of the whole curve from the forward and reverse directions. Then, the feed-rate of interference points is re-determined to avoid jerk overrun on the curve segments between mutual interference points, so as to improve the processing stability of machine tools. The simulation and experiment results demonstrate that the algorithm can obtain the smooth transition of feed-rate and acceleration in CNC machining, and ensured that the jerk can meet the ACC/DEC of system.
With the rapid development of digital imaging technology, the Bayer filter array represents color images. How to restore color images based on the Bayer filter array has become a problem. This paper proposes a novel i...
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ISBN:
(数字)9781510651890
ISBN:
(纸本)9781510651890;9781510651883
With the rapid development of digital imaging technology, the Bayer filter array represents color images. How to restore color images based on the Bayer filter array has become a problem. This paper proposes a novel interpolation algorithm, which leverages a dynamic-weighting mechanism to weight interpolation direction vectors. Experiments show that the improved algorithm has a significant improvement on color image restoration.
With the rapid development of digital multimedia terminals, the scaling of video images has solved the needs of high-end displays for low-resolution signals and high-definition signals displayed by low-end displays. T...
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With the rapid development of digital multimedia terminals, the scaling of video images has solved the needs of high-end displays for low-resolution signals and high-definition signals displayed by low-end displays. The main purpose of this article is to convert the input video image signal into a video image signal with the required resolution through video image scaling. This article mainly studies various image scaling algorithms, analyzes their advantages and disadvantages, and adopts a top-down design method to implement FPGA video scaling design and verify the correctness of the results. This article introduces various traditional image interpolation algorithms. On the basis of comparing the subjective and objective quality of the image after the summation of various algorithms, the fuzzy interpolation algorithm is used to zoom the video image. In FPGA design, hori-zontal scaling and vertical scaling are handled separately, which reduces the computational complexity of image upgrades and facilitates control logic and specific implementation. The experimental results of this paper show that the maximum working frequency that the designed image scaling unit can reach is 153.12 MHz, which can process 1080p video signals in real time. Video image scaling technology has broad market prospects.
Using real-time broadcast ephemeris to calculate satellite orbit information and clock parameters is an important calculation work in GNSS terminal positioning solution. Considering the development tr
Using real-time broadcast ephemeris to calculate satellite orbit information and clock parameters is an important calculation work in GNSS terminal positioning solution. Considering the development tr
The mechanical equipment fault spectrum often contains random noise, and traditional spectrum estimation methods introduce large errors in the fault diagnosis of mechanical equipment including gas blower. Accurate fre...
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The mechanical equipment fault spectrum often contains random noise, and traditional spectrum estimation methods introduce large errors in the fault diagnosis of mechanical equipment including gas blower. Accurate frequency estimation of multi-frequency signals that are contaminated is a common problem. To address the fault spectral characteristics of gas blowers, a novel discrete Fourier transform interpolation algorithm is presented based on traditional practice. The algorithm combines the zero-complement technique and the main lobe fitting technique. The accuracy of the spectrum correction was improved greatly with the new algorithm, and it could effectively promote fault pattern recognition. Application examples and simulation results showed that the new algorithm is very successful in the fault pattern recognition of gas blowers. Under noise conditions, the proposed algorithm has a smaller estimation error than conventional algorithms and could achieve high precision, strong compatibility, and robustness. Theoretically, the algorithm has attained a higher level, and its application in engineering practice is also quite impressive due to its highly expected values.
with the continuous development of industrial automation, the seam of space curve welding meet the accuracy requirements has become the most important issue to be solved by automated welding equipment. In this paper, ...
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ISBN:
(纸本)9781509023134
with the continuous development of industrial automation, the seam of space curve welding meet the accuracy requirements has become the most important issue to be solved by automated welding equipment. In this paper, a small long straight sections connected end to end to fit the space weld trajectory curve, selected discrete points in ensuring error conditions, thus completing the torch movement trajectory tracking, and implement the space curve welding seam welding. Finally, through the Matlab software simulation verify the correctness and effectiveness of the interpolation algorithm.
Screen printing is very common technology in printing and dye factory, now. Silk screen which was used be clean is a born work. In this paper, robot which used in silk screen cleaning is discussed. For silk screen cle...
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ISBN:
(纸本)9789811000720;9789811000706
Screen printing is very common technology in printing and dye factory, now. Silk screen which was used be clean is a born work. In this paper, robot which used in silk screen cleaning is discussed. For silk screen cleaning machine, the robot is used to transfer the silk screen which is ready to be washed. According to the structures of robot and machine, the algorithms of arc interpolation are proposed. In this algorithm, the path of robot end actuator is divided into a series of discrete points. The location and gesture of robot end actuator are computed and the motion parameters of every joint are computed by one dimension scanning optimization algorithm. The algorithm is composed and used in manipulator of robot which is used to transfer the silk screen into washing machine. The experiment results prove that the algorithm is valid and helpful.
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