A smart design method to transform the original two-layer microfluidic chip into a four-layer 3D is proposed. novel fabrication established rapidly and effectively produce device made entirely from polymethylmethacrylate (PMMA). Firstly, CO2-laser cuts PMMA sheets by melting blowing away vaporized material parent obtain high-quality channels of chip. An orthogonal experimental used study its processing stability. In addition, simple, rapid thermal bonding technique successfully applied in...

In wind tunnels, long cantilever sting support systems with low structural damping encounter flow separation and turbulence during tunnel tests, which results in destructive low-frequency big-amplitude resonance, leading to data quality degradation test envelope limitation. To ensure planed obtain high-quality data, an active vibration control system independent of balance signal based on stackable piezoelectric actuators velocity feedback using accelerometer, is proposed improve the...

Full-field displacement perception and digital twins for core components play a crucial role in the precision manufacturing industry, such as aviation manufacturing. This paper presents real-time full-field method combination of online multipoint monitoring matrix completion theory. Firstly, conceptual model based on observed information multi-points is established. To obtain displacements component, component divided into plentiful discrete points, including unobserved which relationship...

In wind tunnel tests, the low-frequency and large-amplitude vibration of cantilever sting result in poor test data pitch plane yaw plane, more seriously, even threatens safety tests. To ensure quality, a multidimensional suppression method is proposed to withstand from any direction, which based on system with stackable piezoelectric actuators velocity feedback employing accelerometers. Firstly, motion equation obtained by Hamilton's principle assumed mode method. Then, active control...

In wind tunnel tests for the full-model fixed with sting, low structural damping of long cantilever sting results in destructive low-frequency and large-amplitude vibration. order to obtain high-quality test data ensure safety tests, an energy-fuzzy adaptive PD (Proportion Differentiation) control method is proposed. This used active vibration a structure under variable aerodynamic load excitation, real-time adjustment parameters achieved according system characteristics energy. Meanwhile,...

High precision position control is essential in the process of parts manufacturing and assembling, where eddy current displacement sensors (ECDSs) are widely used owing to advantages non-contact sensing, compact volume, resistance harsh conditions. To solve nonlinear characteristics sensors, a high-accuracy calibration method based on linearity adjustment proposed for ECDSs this paper, which markedly improves accuracy then measurement accuracy. After matching value output voltage firstly,...

Active vibration control is the most effective method for stochastic multidimensional in wind tunnel tests, which monitoring core foundation. Vibrations are induced by disturbances of several complex air flow instabilities under extreme test conditions with high attack angles. Here, a decoupled unified observation proposed order to fully monitor vibration. First, explained using Cartesian coordinate system. Then, decoupling pitch plane and yaw realized according design principle long...

Three-dimensional (3D) profile scanning plays a crucial role in the inspection of assembled large aircraft. In this paper, to achieve noncontact automatic measurements high-reflective profiles large-scale curved parts and components, an automated system method with high accuracy efficiency are presented. First, hybrid 3D coordinate measurement based on proximity sensors cameras is proposed obtain while avoiding influence reflection accuracy. A model that combines one-dimensional distances...

When excited by broadband wind load, the tunnel model support system with low stiffness and damping is easy to produce multi-modal coupling vibration. It not only leads inaccurate experimental data but also has potential safety hazards. Therefore, ensure reliable development of tests, a vibration control method multi-damping proposed. Firstly, suppression structure designed based on analysis results. Next, modal filter identifying decoupling matrix, which can get independent feedback signals...

Abstract Piezoelectric actuators (PA) are widely used in the field of aircraft wind tunnel testing due to their high displacement resolution and fast response speed. However, exhibits hysteresis characteristics shift under time-varying loads, making it challenging enhance precision, ultimately leading distorted test results. To solve this problem, a novel modeling method PA based on NARXNN (Nonlinear Auto-Regressive model with Exogenous Inputs Neural Network) considering load environmental...

In wind tunnel tests, the low-frequency and large-amplitude vibration of cantilever sting results in poor test data pitch plane yaw plane, even threatens safety. To ensure quality data, an active control method system is proposed to resist any direction, which based on stackable piezoelectric actuators velocity feedbacks using accelerometers, independent balance signals. Firstly, motion equation with obtained by Hamilton's principle assumed mode method. Then, mechanism qualitatively analyzed...

On the basis of process flow large-scale blow molding machine, make PLC as control center, touch screen human-computer interface, this passage introduce overall plan system, hardware configuration and design procedures software, communication technology come true between HMI with MPI, Use PID technology, wall thickness by way cubic spline interpolation.

Assembly tooling is often used as the fixture to support and position aeronautical components in large-scale aviation assembly process, which has characteristics of large size strict precision. The online detection accuracy each positioning structure an important factor determine final quality aircraft. This paper proposes a novel automatic calibration method displacement sensors are structures. Unlike traditional method, proposed treat installation errors extrinsic parameters be calibrated,...