Interpolation Algorithm for Stream Turbine Blade in High Speed and High Accuracy CNC Machining

Motion profile smooth control is significant to reduce the obvious impact on machine tool in high speed and high accuracy CNC machining. However, the jerk is discontinuous and brings about flexible impact on machine tool in the linear Acceleration/Deceleration (ab. Acc/Dec), exponent Acc/Dec and S curve Acc/Dec approach. In the paper, the CNC machine tool dynamic model is built up to analyze the cause of machine impact, to describe the mathematics and physics meanings of jerk. Then a new Acc/Dec approach in which the jerk is continuous is put forward. And the motion profile smooth control algorithm based on continuous jerk is developed in details according to the permissible maximum acceleration, the permissible maximum jerk, the machining program segment displacement and the instruction feedrate. The motion profile smooth control algorithm can achieve continuous jerk, reduce impact on machine tool effectively, and be important to high speed and high accuracy CNC machining.

Download Full-text

Design and Implementation of an Interpolation Processor for CNC Machining

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.819.322 ◽

2013 ◽

Vol 819 ◽

pp. 322-327

Author(s):

Jing Chuan Dong ◽

Tai Yong Wang ◽

Bo Li ◽

Xian Wang ◽

Zhe Liu

Keyword(s):

Real Time ◽

High Speed ◽

High Performance ◽

Low Cost ◽

Parallel Architecture ◽

Cnc Machining ◽

Numerical Control ◽

Experimental Result ◽

Interpolation Algorithm ◽

Asynchronous Instruction

As the demand for high speed and high precision machining increases, the fast and accurate real-time interpolation is necessary in modern computerized numerical control (CNC) systems. However, the complexity of the interpolation algorithm is an obstacle for the embedded processor to achieve high performance control. In this paper, a novel interpolation processor is designed to accelerate the real-time interpolation algorithm. The processor features an advanced parallel architecture, including a 3-stage instruction pipeline, very long instruction word (VLIW) support, and asynchronous instruction execution mechanism. The architecture is aimed for accelerating the computing-intensive tasks in CNC systems. A prototype platform was built using a low-cost field programmable gate array (FPGA) chip to implementation the processor. Experimental result has verified the design and showed the good computing performance of the proposed architecture.

Download Full-text

Review of Research on Hydrostatic Bearings

Recent Patents on Mechanical Engineering ◽

10.2174/2212797613999201217124359 ◽

2020 ◽

Vol 13 ◽

Author(s):

Xiaodong Yu ◽

Yu Wang ◽

Junfeng Wang ◽

Wenkai Zhou ◽

Hongwei Bi ◽

...

Keyword(s):

High Speed ◽

Static Pressure ◽

Development Trend ◽

Cnc Machining ◽

Pressure Effects ◽

Cnc Machine Tools ◽

Future Research ◽

Theoretical Formula ◽

Hydrostatic Bearing ◽

Hydrostatic Bearings

Background: Hydrostatic bearings have the advantages of strong bearing capacity, good stability, small friction coefficient and long life. The performance of liquid hydrostatic bearings directly affect the accuracy and efficiency of CNC machining equipment. The performance is conducive to the development of CNC machine tools towards high speed and heavy load, so it is necessary to sort out and summarize the existing research results. Objective: This study summarizes the current development status of hydrostatic bearings and explains the development trend of hydrostatic bearings. Methods: According to the recently published journal articles and patents, the recent experimental research on hydrostatic thrust bearings is summarized. This paper summarizes many factors that affect the performance of hydrostatic bearings, and discusses the causes of various factors on hydrostatic bearings. Finally, future research on hydrostatic bearings is presented. Results: The study discusses experimental methods, simulation processes, and experimental results. Conclusion: This study can produce dynamic and static pressure effects by changing the structure of the oil cavity of the hydrostatic bearing. This effect can make up for the static pressure loss. By improving the theoretical formula and mathematical model and proposing a new simulation method, the accuracy of the hydrostatic bearing simulation is satisfied; the future development trend of the hydrostatic bearing is proposed.

Download Full-text

The Effect of Strain Rate on the Material Characteristics of Nickel-Based Superalloy Inconel 718

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.340-341.283 ◽

2007 ◽

Vol 340-341 ◽

pp. 283-288 ◽

Cited By ~ 8

Author(s):

Jung Han Song ◽

Hoon Huh

Keyword(s):

Dynamic Response ◽

High Strain Rate ◽

Strain Rate ◽

Turbine Blade ◽

Inconel 718 ◽

High Speed ◽

High Strain ◽

Split Hopkinson Pressure Bar ◽

Experimental Results ◽

Stress Wave Propagation

The dynamic response of the turbine blade materials is indispensable for analysis of erosions of turbine blades as a result of impulsive loading associated with gas flow. This paper is concerned with the dynamic material properties of the Inconel 718 alloy which is widely used in the high speed turbine blade. The dynamic response at the corresponding level of the strain rate should be acquired with an adequate experimental technique and apparatus due to the inertia effect and the stress wave propagation. In this paper, the dynamic response of the Inconel 718 at the intermediate strain rate ranged from 1/s to 400/s is obtained from the high speed tensile test and that at the high strain rate above 1000/s is obtained from the split Hopkinson pressure bar test. The effects of the strain rate on the dynamic flow stress, the strain rate sensitivity and the failure elongation are evaluated with the experimental results. Experimental results from both the quasi-static and the high strain rate up to 3000/s are interpolated in order to construct the constitutive relation that should be applied to simulate the dynamic behavior of the turbine blade made of the Inconel 718.

Download Full-text

Multi-Touch Interaction Generation Device by Spatiotemporally Switching Electrodes

Electronics ◽

10.3390/electronics10121475 ◽

2021 ◽

Vol 10 (12) ◽

pp. 1475

Author(s):

Masahiro Okamoto ◽

Kazuya Murao

Keyword(s):

High Speed ◽

High Accuracy ◽

Conductive Ink ◽

Control Board ◽

Touch Panel ◽

Electrode Size ◽

Touch Input ◽

Touch Interaction ◽

Multiple Electrodes ◽

Touch Panels

With the spread of devices equipped with touch panels, such as smartphones, tablets, and laptops, the opportunity for users to perform touch interaction has increased. In this paper, we constructed a device that generates multi-touch interactions to realize high-speed, continuous, or hands-free touch input on a touch panel. The proposed device consists of an electrode sheet printed with multiple electrodes using conductive ink and a voltage control board, and generates eight multi-touch interactions: tap, double-tap, long-press, press-and-tap, swipe, pinch-in, pinch-out, and rotation, by changing the capacitance of the touch panel in time and space. In preliminary experiments, we investigated the appropriate electrode size and spacing for generating multi-touch interactions, and then implemented the device. From the evaluation experiments, it was confirmed that the proposed device can generate multi-touch interactions with high accuracy. As a result, tap, press-and-tap, swipe, pinch-in, pinch-out, and rotation can be generated with a success rate of 100%. It was confirmed that all the multi-touch interactions evaluated by the proposed device could be generated with high accuracy and acceptable speed.

Download Full-text