A5007831910- Advanced Measurement and Metrology Techniques
- Optical measurement and interference techniques
- Structural Engineering and Vibration Analysis
- Nonlinear Dynamics and Pattern Formation
- Advanced Statistical Methods and Models
- 3D Surveying and Cultural Heritage
- Image and Object Detection Techniques
- Chaos control and synchronization
- Vibration Control and Rheological Fluids
- Gear and Bearing Dynamics Analysis
- Flow Measurement and Analysis
- Industrial Technology and Control Systems
- Machine Fault Diagnosis Techniques
- Engineering Diagnostics and Reliability
- Magnetic Bearings and Levitation Dynamics
- Optical Systems and Laser Technology
- Seismic Performance and Analysis
- Advanced Sensor and Control Systems
- Vibration and Dynamic Analysis
- Power Line Inspection Robots
Shenyang University of Technology
2014-2022
Laser triangulation (LT) is widely used in many fields due to its good stability, high resolution and fast speed. However, the accuracy these applications suffers from severe constraints on data acquisition of LT. To solve this problem, optical principle, object equation path relationship deviation laser spot centroid are applied deduce a mathematical model. Therefore, image sensor inclination errors can be quantitatively calculated, collected compensated real time. Further, threshold...
This study proposes the use of Physics-Informed Neural Networks (PINNs) to further advance curvature interference analysis method. The nonlinear equation system encountered in determining limit line is embedded into PINN loss function, thereby enabling solution high-dimensional, equations. Computational results demonstrate that model achieves a accuracy on order 10−13 when solving multidimensional systems, which comparable classical Fsolve algorithm. reveals presence two boundary lines,...
The inconvenient loading and unloading of a long heavy drill pipe gives rise to the difficulty in measuring contour parameters its threads at both ends. To solve this problem, paper we take SCK230 thread-repairing machine tool as carrier design achieve fast on-machine system based on laser probe. This drives displacement sensor acquire data certain axial section thread by using servo function CNC tool. correct sensor's measurement errors caused point inclination angle, an error model is...
The vibration isolator equipped with a negative stiffness corrector (NSC) excels at isolation, but its often presents complex nonlinearity which needs to be approximated in calculation. To avoid the harmful effects of approximate stiffness, NSC formed by cam-roller mechanism quadratic polynomial trajectory (QCRM) is proposed construct isolation system. From inherent geometrical relationship structure, generation high-static-low-dynamic analyzed, and quasi-zero (QZS) condition system derived....
Great length, large weight and other factors may cause difficulty in measuring the profile accuracy of double-headed screw rotor. To solve this problem, an on-machine system based on a laser-displacement sensor (LDS) was designed implemented paper by taking LXK100 four-axis whirlwind milling machine as carrier. improve measurement system, generalized variable-structural-element morphological method, polynomial interpolation algorithm ellipse fitting method were first combined to realize...
The fault features of rolling bearings are always difficult to detect due the complex operating environment, especially when is in incipient stage with weak symptoms. For detection, this paper proposes a signal processing method based on cascaded combination top-hat product filter and Teager energy spectrum (CCTHPF-TES). First, combining morphological operation operators, four operators presented for extracting vibration signal. Subsequently, by comprehensively investigating characteristics...
摘要: 针对石油钻杆尺寸长、重量大等装卸不便因素给其两端螺纹廓形参数测量带来的困难,提出一种在机精密检测方法,并成功应用于某数控石油螺纹修复机床。该方法利用数控刀架带动激光位移传感器获取螺纹轴截面廓形数据;为修正传感器因测点倾角带入的测量误差,构建了一个倾角误差模型,对数据进行实时补偿;应用B样条曲线对补偿后的数据进行拟合,结合改进的精英克隆选择算法(Elitist clonal selection algorithm,ECSA)对B样条曲线的节点配置问题进行多目标非线性优化,以汉南-昆信息准则(Hannan-Quinn information criteria,HQIC)为亲和力度量来权衡拟合优良性和计算复杂度,自动且精确地计算内节点数量,从而确定最优的节点矢量;最后通过选取的最佳模型获得螺纹参数。倾角误差实验表明,所构建的补偿模型准确有效且可以提高传感器的数据采集精度;仿真验证表明,拟合方法的数据重构精度高,且比其他用于B样条曲线节点配置的智能算法具备更优良寻优性能;NC50型螺纹检测实验表明,研究的检测方法可以完成石油钻杆螺纹在机精密检测,测量精度为±2 μm,提高了测量精度和效率。
Balancing with the influence coefficient method can eliminate rotor unbalance effectively and briefly which usually causes mechanical vibration. But accuracy of this is susceptible to operating condition structure equipments will leads unstable equilibrium outcomes. The theoretical study balancing find that solution process weight does not involve nature vibration, therefore it be subject greater interference equation’s ill-conditioned characteristics. By introducing modal superposition,...
The B-spline-based data fitting is markedly ameliorated when knots are considered as free variables. But in this regard, B-spline approximation becomes a complex, continuous, multi-modal and multi-variable nonlinear problem named knot adjustment. In context, we propose an improved elitist clonal selection algorithm (ECSA) for the automatic adjustment of curves paper. attempt to improve search efficiency solution quality algorithm, increase population diversity, avoid prematurity, paper also...