Dynamic simulation innovation of gear transmission under different factors
① The precise dynamic model considering the friction of tooth surface is established, and the complex time-varying stiffness and the […]
① The precise dynamic model considering the friction of tooth surface is established, and the complex time-varying stiffness and the […]
When machining non-circular gear, the relative velocity before two gears is perpendicular to the normal vector of the meshing contact
In order to get the meshing equation and the tooth profile equation of non-circular gear, it is necessary to establish
The machining basis of noncircular gear is the generating method. Firstly, the non-circular gear blank is processed, and the gear
The reducer variable speed integrated gear is a new type of gear mechanism, which is composed of ordinary involute cylindrical
Robustness is also known as robustness. For gear modification, it is to ensure that the optimal modification scheme has stable
A more detailed chemical composition analysis of the gear material sent for inspection is performed based on the spectral analysis
Based on the actual engineering application, the dynamic characteristics of gear transmission system and the methods of vibration reduction and
Gear backlash is the amount of circumferential shaking of another gear when one gear is fixed, which is calculated by
Electron spectroscopy is a common method for analyzing surface components of materials.The root surface near the fracture source and the
The knocking dynamics of the vehicle transmission includes two aspects: one is the knocking in neutral, i.e. the knocking produced
Transmission error is the main excitation of gear vibration. It combines the influence of meshing time-varying stiffness and manufacturing error,
For the set optimization objective, that is, the minimum peak peak te optimization of transmission error, it is not known
In the development of planetary gear drive, it is found that there is obvious noise in the bench test of
The fracture specimens were cut at the gear break and cleaned several times, then the fracture morphology was analyzed.The micro-morphology
The maximum dynamic meshing force and the dynamic load coefficient of the loaded gear are analyzed respectively. They can provide
1) Decoding According to the encoding mode, the chromosome bit string is decoded to obtain the shape modification quantity is,
The external excitation load of vehicle gear transmission system mainly includes engine input torque and load torque. The engine of
① Gene coding of modification parameters Four modification parameters of driving gear are defined as tooth height deflection (is δ),
The dynamic bearing force is an important parameter in the dynamic response. The dynamic characteristics of the gear system are
In the established five-gear manual transmission model, there is coupling of finite element model, and the number of degrees of
The stiffness matrix of the rolling bearing connects the relative displacement and deflection of the inner raceway to the center
Rockwell hardness tests were carried out on the surface and center of the intermediate shaft sun wheel at different points.
Modal flexibility is the degree to which a modal frequency of the system is easily excited by the transmission error
There are several calculation methods for gear drive errors, including finite element method and empirical analysis method.The transmission error obtained
(1) Comparison between simulation and experiment Figure 1 compares the acceleration simulation and experimental results of pinion end with obvious
(1) Design variables The design variables of static performance optimization model and dynamic performance optimization model are the same. (2)
The establishment of dynamic simulation model is completed by RomaxDesigner.In the model, the shafting is treated as a Timoshenko beam
Then the engagement force Np, Ng and friction force Fp, Fg can be expressed as: Where: lambda (t) is the
The dynamic simulation is carried out by using Benedict amp; Kelly model and time-varying friction coefficients obtained in Figure 2.8
Based on the dynamic and static characteristics, the optimization model of tooth profile modification is established, and the optimization design
First, the differences of gear dynamic characteristics with different friction models are discussed.Figures 1 and 2 show the time and
The fluctuation of gear meshing stiffness is an important excitation source for gear vibration. Accurate calculation of gear meshing stiffness
In order to study the comprehensive influence of meshing force and friction force on tooth surface, a simplified dynamic model
Firstly, the engagement process of the gear is analyzed. The engagement state and force diagram of the gear is shown
Analyze the time-domain curve of meshing stiffness and meshing force of the gear under the optimal modification amount, and compare
The modification length is 2.8mm, the change range of modification amount is [0, 0.05mm], and the value interval is 0.02mm.
There are many types of profile modification curves. According to the different functional forms of the modification quantity with respect
The center support stiffness is selected according to the allowable deflection of the drive shaft. The center support stiffness meets
Cut and process the inspection gear along the axial direction and about 1/4 diameter into U-type impact test specimen, and
1. Group test results Data of fatigue test results obtained by group method of shot peened gear and non shot
1. Test method The bending fatigue test fixture of gear material adopts the single tooth loading method shown in Figure
Bending fatigue performance is an important index to evaluate the bearing capacity of gears. Shot peening is an effective way
In the nonlinear dynamic model of yaw-torsion coupling, there are two main factors affecting the yaw vibration, i.e. the bias
Metallographic structure evaluation of failed gears is carried out according to national inspection standards.The metallographic observation is etched with 4%
There are three aspects to consider when designing the tip radius: (1) No interference occurs in the running process of
Take the point on the center line as the coordinate origin, fix the base vectors of the coordinate systems S0
Tooth thickness is an important parameter for balancing the fatigue life of large and small wheels.Since the number of small
Nonlinear dynamic model of yaw-torsion coupling was established for involute spur fixed-shaft gear drive and planetary gear drive respectively, and
Use CAD software to build accurate 3D model of linear bevel gear pair, as shown in the figure. By substituting
The tooth profile of the driving and driven section of the linear gear pair is shown in the figure. The
Bending fracture of teeth and pitting and flaking of tooth surface are the two most common failure modes of main
Nonlinear dynamic model of yaw-torsion coupling was established for involute spur fixed-shaft gear drive and planetary gear drive respectively, and
The linear gear can also improve the transmission stability by increasing the degree of coincidence. The calculation formula of line
Establish the right-hand coordinate system, as shown in Figure 1. S (o-xyz) and S (oxpypzp) are the main and driven
(1) Acceleration signal testing principle A three-way acceleration sensor is installed at 180 degrees intervals on the same circumference of
Nonlinear dynamic model of yaw-torsion coupling was established for involute spur fixed-shaft gear drive and planetary gear drive respectively, and
1 Construction of modified tooth surface The modified tooth surface is constructed by superposition of theoretical tooth surface and modified
The innovations of the research work can be summarized as follows: (1) The coupling relationship between the acting direction of
Nonlinear dynamic model of yaw-torsion coupling was established for involute spur fixed-shaft gear drive and planetary gear drive respectively, and