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 […]
The test set data is input into LSTM model to verify the effectiveness of model early warning. The prediction results […]
The traditional and improved processes are used for experimental study. The typical deformation conditions of the blank during the deformation
Randomly select 25% of the training set data as the verification set, set the model loss value as Mae, and
In this paper, the first mock exam of the internal gear of a solid cylinder with no hub hub and
The traditional closed die forging of internal gear is shown in figure (a). In the process of pressing the blank
The LSTM model is trained by selecting the normal operation data of the unit. When the gearbox bearing is in
With reliable transmission quality and efficiency, gears are widely used in mechanical field, especially in military industry, aerospace and other
A new kurtosis spectral entropy index is proposed, which consists of kurtosis value and envelope spectral entropy. When there are
Particle swarm optimization algorithm has good global optimization ability. Suppose there are m particles in the d-dimensional space, which form
The figure is the confusion matrix corresponding to the method in this paper, through which the identification of each type
Under the elastic-plastic condition, the J-integral of helical gear crack describes the stress and stress field at the crack front
Gear is of great significance to all kinds of mechanical equipment. Its performance may directly affect the service life and
In order to verify the advantages and effectiveness of intelligent fault diagnosis of gearbox bearing based on Sanc and 1d-cnn,
According to the working principle of Sanc, the separation effect of adaptive filter mainly depends on the selection of delay
The parameters of neural network mainly include: learning rate, cost function, activation function, number of learning rounds, batch size, network
After the candidate region is generated, the ROI pooling layer is used to further extract the features of the candidate
In order to verify the effectiveness of the proposed method, the experimental study is carried out on the zjs50 comprehensive
In order to generate accurate candidate regions, 512 feature maps are used as input of RPN (region proposal networks) and
The deep learning algorithm is introduced into the field of Ferrography Image recognition. The wear status of gearbox is evaluated
Combined with the signal separation ability of Sanc and the intelligent feature extraction and fault identification ability of 1d-cnn, this
Combined with the signal separation ability of Sanc and the intelligent feature extraction and fault identification ability of 1d-cnn, this
During the operation of the equipment, when abnormal friction occurs on the relative moving metal surface, wear particles will be
Gear reducer is a kind of closed mechanical transmission device. Its main function is to reduce the speed of input
According to the normal state and the fault state, the corresponding two groups of data in the experiment are taken
The data in normal working state is selected as the training set of the model, with a total of 12800
Symmetrical differential energy operator demodulation and energy operator demodulation are only applicable to single component AM / FM signals, while
In this paper, the vibration data of the whole life cycle of the wear fault are obtained by testing the
LSTM principle LSTM model is a special form of recurrent neural network (RNN), which can mine the relationship between the
In order to further verify the correctness of the analysis on the influence of grinding wheel position deviation on the
ZHY Gear adds three sinusoidal signals with different frequencies, and adds random signals for simulation analysis. The EMD method combined
Data preprocessing The data comes from the unit operation data recorded by SCADA system of a wind farm in Northwest
As an important part of wind turbine, gearbox is mainly composed of gear, rolling bearing and other parts. The common
The input torque tin = 1 000 n · m, the output torque tout = – 100 N · M.
1.EEMD principle In order to solve the mode aliasing phenomenon of IMF in the process of empirical mode decomposition (EMD),
In the study of multi degree of freedom system, the influence of viscous damping should be considered. The differential equation
Analysis of upsetting forming of mechanical gear The equivalent stress of initial cylindrical blank upsetting forming of mechanical gear is
In order to verify the superiority of this method in engineering application, relevant tests are carried out on the closed
The coupling of mild wear fault data produces a 1.5-dimensional envelope spectrum, as shown in Figure 1. It can be
When multiple faults coexist, different fault features need to be decomposed into different intrinsic mode functions. Therefore, EEMD is needed
In the whole life cycle experiment of planetary gear box, ZHY gear selects three groups of data of different time
In the process of tractor gear transmission, the transmission load is large, the running speed is low, and the transmission
As the most commonly used mechanical transmission components, gearbox faults are very common, including gear faults, bearing outer ring, inner
The experimental system consists of three-stage planetary gearbox, motor, brake and its switch, sensors (acceleration sensor, eddy current sensor, etc.)
Gearbox has the advantages of compact structure and high transmission efficiency, which is the most widely used transmission component at
In the previous literature, 1.5-dimensional spectrum can be used to detect the secondary phase coupling, that is to say, frequency
Because the wind turbine often works in the harsh environment, the number of units is too much, so the fault
According to the analysis of the forming process of the mechanical gear forging parts, there are two main forming processes
According to the different definitions, the 1.5-dimensional spectrum of the complex harmonic signal can detect the components involved in coupling
In order to further verify the effectiveness of this modification method, the optimized gear is assembled on the transmission for
Gear modification has great influence on the vibration and noise of gear and the load distribution on the tooth surface.
There are some defects in the process of die forging, such as insufficient mold filling and cracks. In order to
Because the Gaussian process of the third-order cumulant spectrum is zero, it is often used to analyze the non Gaussian
In order to reduce the vibration and noise of gear in the process of power transmission and reduce the impact
Taking the gear transmission mechanism of a five speed transmission as the research object, the gear transmission mechanism model of
Gear is the most common power transmission mechanism used in various types of transmission. It has the advantages of strong
As an important transmission system of mechanical equipment, mechanical gear has the advantages of high transmission efficiency, high transmission precision,
The basic ideas of finite element analysis are summarized as follows 1) The continuous structure is discretized into a calculation
Although the conventional design can meet the requirements of transmission function, the design scheme is not the optimal design scheme
Due to the advantages of small volume, large transmission ratio, strong bearing capacity and high efficiency, planetary gearbox is widely
Five models are used to test the model fault on the validation data set. The validation data set has 5000