Coriolis mass flowmeter (CMF) is a kind of flow measurement instrument which can directly measure the high precision transient parameters. And vibration characteristic U-shaped measuring tube inside one important factors that determine accuracy. The pulsating through will lead to motion component except main frequency, affect phase difference calculation and reduce accuracy flowmeter. This paper presents method improve U-tube CMF based on variable step size Least Mean Square (LMS) filter...

Due to the drift of low-cost micro-electro-mechanical systems sensors and recursive computation, pedestrian tracking based on foot-mounted inertial suffers from accumulative velocity position errors. The well-known approach named zero update (ZUPT) is able minimize such errors by resetting when foot does not move with respect ground. This time duration called still phase a stride can be detected comparing actual sensor data pre-defined threshold. However, increases or decreases, fixed...

This paper presents a novel smartphone-based indoor localization system that integrates an infrastructure-based acoustic with inertial sensor-based dead reckoning. A fuzzy inference is developed to achieve short-term high accuracy tracking by using sensors. The positioning and the reckoning are then fused Kalman filter carefully designed decision making algorithm. Hence, long-term stable precise localization, which also robust against measurement noise of system, can be achieved....

Drilling fluid plays an irreplaceable role in drilling operations, serving functions such as cuttings transportation, signal transmission, and wellbore stability maintenance. The measurement of rheological parameters is crucial for optimizing hydraulic rock breaking, precisely controlling bottom-hole pressure stability, ensuring cleanliness. Currently, manual methods the Marsh funnel six-speed rotational viscometer are commonly used on-site, but they suffer from long cycles significant human...

The strapdown inertial navigation system (SINS) can be installed on a shearer and used for monitoring its position. However, under the complex environment of mechanized mining face, strong vibration may cause large calculation error. First, dynamic model double-drum is built with force analysis, spectrum characteristics linear angular fuselage are then obtained. Second, coning error sculling compensation models SINS derived based characteristics. Meanwhile, according to factor uncompensated...

Predicting the acute toxicity of a large dataset diverse chemicals against fathead minnows (Pimephales promelas) is challenging. In this paper, 963 organic compounds with towards were split into training set (482 compounds) and test (481 an approximate ratio 1 : 1. Only six molecular descriptors used to establish quantitative structure-activity/toxicity relationship (QSAR/QSTR) model for 96 hour pLC50 through support vector machine (SVM) along genetic algorithm. The optimal SVM (R 2 = 0.756)...

The accurate measurement of position and orientation for shearers is a key technology in realizing an automated, fully-mechanized, coal mining face. Since Global Positioning System (GPS) signal cannot arrive at the mine underground, wireless sensor network positioning system operate stably mine; thus strap-down inertial navigation (SINS) used to measure shearer. Aiming problem SINS accumulative error, this paper proposes error correction method based on motion constraint-aided zero velocity...

The goal of creation large-area deep sub-wavelength nanostructures by femtosecond laser irradiation onto various materials is being hindered the limited coherence length. Here, we report solution problem light field tailoring incident beam with a phase mask, which serves generation wavelets. Direct interference between wavelets, here first-order diffracted beams, and wavelet its induced waves such as surface plasmon polariton are responsible for microgratings superimposed nanogratings,...

In the oil and gas industries, it is crucial to employ appropriate drilling fluids in order maintain equilibrium of formation pressure throughout various stages operations. During recycling process, fluid may precipitate as a result exhibit non-full pipe flow upon return surface. Accurate measurement volume rate imperative obtaining valuable information from bottom well. Commonly, on-site operations use multiphase target flowmeter conjunction with an empirical model rectify calculation...

The accurate stable measurement of position for a shearer is key technology in realizing an automated fully mechanized coal mining face. Using as base SINS/UWB integrated positioning system, the signal interference and node damage UWB often cause invalid because bad working environment mine. Consequently, accuracy system decreases quickly, due to drift error SINS. Aiming at two styles include partial anchor failure all nodes UWB, this paper proposes using multi-model intelligent switching...

The strap‐down inertial navigation system (SINS) is a commonly used sensor for autonomous underground navigation, which can be shearer positioning under coal mine. During the process of initial alignment, inaccurate or time‐varying noise covariance matrices will significantly degrade accuracy alignment shearer. To overcome performance degradation existing algorithm complex environment, novel adaptive filtering proposed by integration strong tracking Kalman filter and sequential with...

The strap-down inertial navigation system (SINS) is a commonly used sensor for autonomous underground that can be shearer positioning under coal mine. To overcome the performance degradation of existing initial alignment algorithm based on an frame with strong vibration conditions in mines, novel compensation strategy dynamic model presented. This mainly compensates linear caused by harsh environment shearer. Meanwhile, this effectively estimate velocity shearer's fuselage and avoid error...

Taking mining fleet constituted by a shearer, hydraulic supports and scraper conveyor as the object, needs to move intended position in accordance with functional requirements, such machinery tracking of memory cutting shearer. This paper proposes shearer wireless positioning method under conditions inaccurate anchor nodes. First, action rules for an adaptive height adjustment strategy are arranged based on analyzing cooperative movement fleet. Second, duality mapping between local strong...

While drilling, the drilling tool can reach target layer more quickly and efficiently with accurate borehole trajectory information. It reduce cost. However, in process of traditional well inclination measurement due to interference form rotary vibration drill string, inclinometer needs stop complete attitude. And sensor is installed far away from drill, so error risk control are increased. In order solve problem that near bit which caused by complex shock string rotation, this paper...

The measurement information of the traditional conventional while drilling (MWD) method lags seriously because installation position is far from bit. However, near-bit inclinometer will generate a large number vibration interference signals when bit breaks rock in process, resulting continuous increase errors measured by microelectromechanical system (MEMS) inertial sensor. Aiming at problems low accuracy and poor stability under long-term complex signals, error identification suppression...

In the process of coalbed methane directional well drilling, drilling through coal seam and large trajectory deviation is easy to occur, essence which that near-drill bit measurement unit produces a number complex interference noise due impact vibration generated by rotation tool rock breaking drill bit, seriously affects accuracy attitude tool. Aiming at near-bit dynamic unit, method near in based on heavy-tailed suppression proposed this article. First, principle influencing factors are...