Insects with small and light bodies possess the capability of agile fast movement in a space. Inspired by nature, an insect-like soft robot may update strategies many scenarios like exploration, rescue, etc. However, design mass manufacture robots combining insect size, mobility, good robustness, impact-perception still present great engineering challenges. Herein, we report insect-scale (15 mm body length (BL), 450 mg weight) ultrafast (∼4.0 BL s–1) robot. The remarkable motion performance...

Electricity-conducting coatings are widely applied in industries, such as thermal barrier coating the aerospace field. Therefore, it is necessary to detect thickness and conductivity of ensure quality coating. Extended on existing work detection by traditional eddy current (EC) technique, this paper investigates feasibility pulsed EC (PEC) technique detection. For single-layered electricity-conducting coating, coupled influence relationship between PEC signal deeply analyzed, approach for...

Abstract The applications of acoustic focusing and asymmetric (AAF) are severely constrained by the narrow frequency bandwidth. In this paper, we report broad bandwidth lens consisting monolayer dual-layer metamaterials, respectively. Additive manufacturing technology was utilized to fabricate designed lens. Finite element analysis experimental approaches adopted verify performances focusing. results demonstrate that can converge waves at from 4717 Hz 7717 Hz. excellent AAF effect be...

To expand the potential use of in-shoe motion sensors (IMSs) in daily healthcare or activity monitoring applications for healthy subjects, we propose a real-time temporal estimation method gait parameters concerning bilateral lower limbs (GPBLLs) that uses single IMS and is based on event detection approach. validate established methods, data from 26 participants recorded by an reference 3D analysis system were compared. The agreement between proposed was evaluated intraclass correlation...

To improve the control precision of nonlinear register system for flexographic printing, a feedforward active disturbance rejection (ADRC) parameter self-tuning decoupling strategy based on radial basis function (RBF) is proposed to address existence coupling interference and multiple working conditions. Firstly, according structure printing equipment registration principle, mathematical model global established linearized using small deviation method. Secondly, decoupled controller designed...

Femtocells are low-power user-deployed base stations that operate in licensed spectrum and provide high-quality cellular service indoor environments. However, there may be severe cross-tier interference between femtocells macrocells. In this paper, our focus is on downlink traffic channel management for macrocell users. We propose a novel scheme macro-femto cochannel deployment scenario. The femtocell adjusts its maximum transmit power to suppress the experienced by macro users close...

In order to explore the relationship between displacement-pulling force and change of clamping during pulling process cotton stalks in field by different types clamps, a test bench for was designed. Based on combination virtual instrument technology external hardware, device is programmed Gx Works2 LabVIEW programming software complete operation measurement acquisition information. From mapping collected information, average value maximum uplift 500 N, corresponding an upward movement 12 mm...

In order to study the influences of properties measured material, measure distance, size transducer coil and inputting frequency on distribution magnetic lines force in measurement system eddy current intensity measured, firstly, distance are deduced according foundational theory; then, is simplified as sensor faces a big cylinder part, which finite element model axis-symmetry quasi-steady electromagnetic field built up based; finally, influence every factor discussed respectively. The...

Due to a harsh working environment, micro-cracks in metal structures (e.g., airplane, oil/gas pipeline, hydro-turbine) often lead serious accidents, so health monitoring of the metals is great significance ensure their safe operation. However, it hard perform quantitative detection multiple by single nondestructive testing (NDT) technique because limits. To monitor for metals, Traditional Eddy Current (TEC) and Pulsed (PEC) fusion NDT proposed this paper. In technique, TEC adopted seek...

China’s small-arched shed-building machinery mostly adopts manual pole casting and mechanical planting, which have low building efficiency mechanization. Therefore, we designed an automatic feeding device for shed poles to realize single separation, orderly conveyance timely dropping of poles. Considering pole-pitching pass rate as the evaluation index regression model, adopted a three-factor, three-level experimental design established speed reclaiming ring, height falling ring spacing main...

Abstract Acoustic metamaterials possess fire-new capacities to manipulate the reflected, refracted and diffracted wave wavefronts effectively flexibly through designing special artificial structures. In this paper, a transmission-type phase gradient with high efficiency transmission variations shift covering full range of 2 π was reported. Capacities manipulating angle using designed acoustic were expected be realized under guidance generalized Snell’s law. An filtering strategy occupying...

Falls rank as the second main cause of accidental death and injury in older adults, so technologies are urgently needed that accurate, inexpensive, easy to use administer fall risk assessments daily living. In this study, first stage assessing living, by using in-shoe motion sensor (IMS), we aim develop an assessment method for dynamic balance ability is important factor assessment. Sixty-four elderly participants were recruited constructing model, 20 other model validation. We used...

In three-dimensional reconstruction technology, it mainly includes the active time of flight method and passive binocular stereo vision method. However, is easy to be affected by external environment illumination corresponding device expensive. The matching speed slow. Therefore, this paper chooses line structured light with good real-time performance, high accuracy strong stability. complex free-form surface taken as research object. Due serious mutual occlusion order derivability at any...

Aiming at the problem of complex and low efficiency intelligent patrol paths in 220/500 kV bionic substations, this paper proposes a method for collaborative inspection multiple robots. Firstly, deficiencies Biological Inspired Neural Network algorithm(BINN) large corner scenarios are analyzed, an improved solving neuron activity value near boundary obstacle proposed, order to solve phenomenon that decrease neurons can transmit values neighborhood leads generally values, which unreasonable...

Abstract Current Analysis of pixel quantization error has following problems in the binocular vision system. Most literatures are based on ideal system with equal focal length. Moreover, precision is relatively low. In order to solve above problems, an analysis method for unequal length proposed. Firstly, a model established and mathematical expression presented characterize model. Secondly, case lengths, measurement object point discussed respectively. Finally, simulation experiments were...

The accuracy and stability of laser fringe center extraction are very important for surface measurement in 3D based on linear structured light. At present, most algorithms easy to have the problem line breaking sensitive strong light; complex high-order free-form is taken as experimental object this paper. On one hand, due its derivability at any point surface, light scattering serious leads breaks slope surface. other order realize complete illumination condition needed but To solve above...