Structural optimization design of multi gear rocker box in shearer cutting section
Topology optimization is a kind of conceptual design. The optimization results are shown in the figure, which can not be […]
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Feature extraction of gear broken fault
Firstly, the vibration signal is resampled in the angular domain, and the input shaft speed curve (as shown in Figure
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Non Hertz contact model of multi-stage gear with three-dimensional topological modification considering box deformation
Three dimensional topological modification is an effective means to improve the transmission quality of gear system, which includes two directions
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Numbering method of degrees of freedom for multi-stage gear transmission box coupling dynamic model
The generalized displacements of substructure dynamic equations are numbered in local coordinates, and the generalized displacements of each substructure will
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VMD for solving variational problems in gear calculation of variable speed gearbox
By introducing the quadratic penalty factor α and Lagrange operator λ (T), the constrained variational problem is transformed into the
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Variational modal decomposition of Gearbox Based on VMD-FastICA
VMD is an adaptive signal analysis method, which can find the optimal solution of the variational model through multiple iterations,
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Tooth direction error of multi-stage gear meshing in shearer cutting part
Under the influence of the elastic deformation of the supporting system, the axes of the parallel gears are skewed in
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Substructure set of multi stage gear box coupling dynamic model
According to the different coordination relationship of the interface of each substructure, the connection types between the corresponding nodes can
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Minimum entropy deconvolution of gearbox
Med is to eliminate the influence of transmission path by optimizing the filter. xn(n = 1，2，… , n) is the
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Example and mathematical model of optimum design for minimum center distance of two stage spur gear
As shown in the figure, it is known that the input power P1 of the high-speed stage of the two-stage
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Substructure decomposition of multi stage gear box coupling dynamic model
The cutting part is divided into rocker box, fixed shaft gear, gear shaft, cutting drum, planetary gear train and cutting
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Example and mathematical model of optimum design for minimum center distance of two stage spur gear
As shown in the figure, it is known that the input power P1 of the high-speed stage of the two-stage
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Constraint conditions of minimum center distance for two stage spur gears
① According to the contact fatigue strength formula of tooth surface, the The constraint conditions of tooth surface are obtained
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Mathematical model of minimum center distance of two stage spur gear
The transmission diagram of the reducer is shown in the figure, and the optimization design is carried out according to
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Brief introduction of fimicon function of minimum center distance of two stage spur gear
Given the transmission power P, transmission ratio I and output speed n of the reducer, a set of technical parameters
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Analysis of model prediction results of fan gearbox under abnormal state based on LSTM network
The test set data is input into LSTM model to verify the effectiveness of model early warning. The prediction results
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Analysis of model prediction results of fan gearbox under normal state based on LSTM network
Randomly select 25% of the training set data as the verification set, set the model loss value as Mae, and
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Sliding window analysis of residual error prediction for fan gearbox model based on LSTM network
The LSTM model is trained by selecting the normal operation data of the unit. When the gearbox bearing is in
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Maximum kurtosis spectrum entropy deconvolution method for gearbox
A new kurtosis spectral entropy index is proposed, which consists of kurtosis value and envelope spectral entropy. When there are
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Local particle swarm optimization algorithm for gearbox
Particle swarm optimization algorithm has good global optimization ability. Suppose there are m particles in the d-dimensional space, which form
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J-integral theory of helical gear crack
Under the elastic-plastic condition, the J-integral of helical gear crack describes the stress and stress field at the crack front
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Parameter selection of gearbox bearing experiment based on Sanc
According to the working principle of Sanc, the separation effect of adaptive filter mainly depends on the selection of delay
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Gearbox Ferrography Image Detection Network and training
After the candidate region is generated, the ROI pooling layer is used to further extract the features of the candidate
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Generating candidate regions for ferrography of gearbox
In order to generate accurate candidate regions, 512 feature maps are used as input of RPN (region proposal networks) and
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Automatic feature extraction of gearbox Ferrography Image
The deep learning algorithm is introduced into the field of Ferrography Image recognition. The wear status of gearbox is evaluated
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Classification of wear particles in gear box ferrography
During the operation of the equipment, when abnormal friction occurs on the relative moving metal surface, wear particles will be
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Experimental data analysis of symmetric differential energy operator demodulation method for planetary gearbox based on EEMD
According to the normal state and the fault state, the corresponding two groups of data in the experiment are taken
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Analysis of demodulation method for planetary gearbox based on EMD and symmetric differential energy operator
Symmetrical differential energy operator demodulation and energy operator demodulation are only applicable to single component AM / FM signals, while
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Experimental data acquisition of planetary gearbox based on EEMD symmetric differential energy spectrum
In this paper, the vibration data of the whole life cycle of the wear fault are obtained by testing the
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Simulation analysis of contact line VERICUT grinding of cylindrical gear
In order to further verify the correctness of the analysis on the influence of grinding wheel position deviation on the
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Simulation processing and analysis of planetary gearbox based on EEMD symmetrical difference energy spectrum
ZHY Gear adds three sinusoidal signals with different frequencies, and adds random signals for simulation analysis. The EMD method combined
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Bifurcation characteristics of two stage planetary gear system varying with excitation frequency
The input torque tin = 1 000 n · m, the output torque tout = – 100 N · M.
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Application of EEMD and demodulation principle of symmetric differential energy operator in planetary gearbox
1.EEMD principle In order to solve the mode aliasing phenomenon of IMF in the process of empirical mode decomposition (EMD),
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Dynamic simulation model of gear transmission shaft considering forced vibration
In the study of multi degree of freedom system, the influence of viscous damping should be considered. The differential equation
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Simulation results and analysis of mechanical gear based on DEFORM
Analysis of upsetting forming of mechanical gear The equivalent stress of initial cylindrical blank upsetting forming of mechanical gear is
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Experimental analysis of planetary gearbox wear fault based on 1.5-dimensional envelope spectrum
The coupling of mild wear fault data produces a 1.5-dimensional envelope spectrum, as shown in Figure 1. It can be
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Experimental analysis of planetary gearbox fault based on 1.5-dimensional envelope spectrum
In the whole life cycle experiment of planetary gear box, ZHY gear selects three groups of data of different time
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Fault experiment of planetary gearbox based on 1.5-dimensional envelope spectrum
The experimental system consists of three-stage planetary gearbox, motor, brake and its switch, sensors (acceleration sensor, eddy current sensor, etc.)
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Secondary frequency coupling proof of planetary gearbox
In the previous literature, 1.5-dimensional spectrum can be used to detect the secondary phase coupling, that is to say, frequency
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Analysis and verification of planetary gearbox simulation signal
According to the different definitions, the 1.5-dimensional spectrum of the complex harmonic signal can detect the components involved in coupling
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Definition of 1.5-dimensional spectrum of planetary gearbox
Because the Gaussian process of the third-order cumulant spectrum is zero, it is often used to analyze the non Gaussian
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Principle and method of gear profile modification of transmission
In order to reduce the vibration and noise of gear in the process of power transmission and reduce the impact
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Strength and axial stiffness check of spiral bevel gear planetary gear box
The basic ideas of finite element analysis are summarized as follows 1) The continuous structure is discretized into a calculation
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Gearbox model test under fault condition
Five models are used to test the model fault on the validation data set. The validation data set has 5000
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Strength check of spiral bevel gear planet carrier
In the process of planetary carrier transmission, the axis of planetary gear will be offset, and the load distribution in
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Strength check of spiral bevel gear planetary reducer
The contact analysis of meshing gears of planetary gear train is carried out by using transient dynamic model. To simplify
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Traditional calculation and check of spiral bevel gear planetary reducer
The main failure modes of gear transmission are tooth surface pitting and tooth fracture. The working time of the reducer
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Example of NC milling of non bevel gear
Using the above method to calculate the NC machining coordinate of spiral tooth non bevel gear, the gear pitch curve
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Position of milling cutter head for non-circular spiral bevel gear
For the non-circular gear, assuming that the radius of the imaginary flat top gear is equal to the spherical radius
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Coordinate transformation in NC machining of spiral bevel gear
Because the coordinate system of milling cutter head is not the coordinate system of CNC machine tool, but also requires
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Imaginary flat top gear and gear blank corresponding arc length of single tooth
As shown in the figure, according to the geometric relationship, the turning angle of single tooth is cut according to
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VMD test verification of variable speed gearbox gear calculation
The mechanical fault comprehensive simulation test bench produced by a company is used to carry out the fault feature extraction
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Spiral angle of spiral tooth non bevel gear
The inclination of spiral bevel gear teeth is measured by the helix angle β I. The longitudinal tooth profile of
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NC milling method of non circular spiral bevel gear
For bevel gear, pitch curve is circular, and each tooth is the same. During machining, the starting position of the
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VMD order tracking technology for gear calculation of variable speed gearbox
In order to calculate the order tracking, a reference axis should be selected as the basis of calculation. The main
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Influence of tooth profile parameters of gear micropump on flow pulsation
For the involute gear, the tooth profile parameters are mainly the number of teeth Z, modulus, pressure angle α, modification
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Influence of trapped oil pressure on flow pulsation of gear micropump
The flow fluctuation quality is mainly reflected in the fluctuation coefficient. The smaller the fluctuation coefficient is, the better the
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Unloading flow calculation of gear micropump affecting instantaneous flow
In one meshing cycle of [S1, S4], only the volume change rate DV of trapped oil compression in Fig. 1
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Instantaneous flow rate of gear micropump under trapped oil
The medium in the pump is non compressed. With the continuous rotation of the gear pair at the speed of
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Self reference adaptive noise elimination for gearbox bearings
Sanc obtains the reference signal by delaying the original signal, extracts the periodic signal component by autocorrelation analysis, and finally