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Based on the modular design idea, this paper constructs a model library of the components of the planetary shifting mechanism, including the planetary platoon, clutch, brake and other models, and realizes the automatic generation of the mathematical model by analyzing the connection relationship between the components. Design and establish a framework for the automatic analysis of the planetary transmission system, a model library of the components of the planetary transmission system, and compile the performance analysis software for the vehicle planetary transmission system to realize the automatic analysis of the planetary transmission system.
The speed analysis model takes the sun gear, the ring gear, the planet carrier of the planetary row, the active and passive sides of the clutch, the rotational speed of the brake as a variable (the number of variables is 3p 2c b), the constraint relationship between the three components of the planetary row, the clutch and the brake The working state and the system input are constraints, and the speed balance equations are constructed, which are composed of the characteristic equations of the components and the connection equation between the components.
Transmission ratio calculation and power flow analysis On the basis of calculating the rotational speed and torque of each basic moving part, the ratio of the input and output member rotational speeds is the transmission ratio; the product of the rotational speed and torque of each component and the efficiency obtained by the relative power method Dividing by the power transmitted by the member at 9549, the transmission path of the power in the planetary shifting system is obtained. The direction of power is defined as follows: If a basic component is subjected to the same direction of torque on a port and its direction of rotation, the power is positive, that is, the component absorbs power from the force port, or power is used here. If the torque direction is opposite to the direction of rotation, the power is negative, that is, the component discharges power from this point, or the power is output therefrom.
In the model layer, the modularization of planetary gears, clutches, brakes and other components in the planetary transmission system inherits from the basic modules of the physical system that realizes energy conversion or transmission. Through code encapsulation, the module's port access, parameter setting and mathematical expression are realized. The update and other functions to achieve processing and analysis of the module data.
Through the analysis of the transmission diagram built by the view layer, the relationship between the speed and the torque balance between the modules and the modules is automatically written. When the system is input, the complete equations can be obtained, and the numerical calculation can be performed to find each The speed and torque of each port of the module are as shown.
The relative power method is used to obtain the efficiency of the transmission system, and the power flow of the system is analyzed.
The automatic construction of the speed torque equation group consists of the speed and torque relationship between the ports in the module and the speed and torque equations generated by the connection relationship between the modules. When the structure or parameters of the transmission system change, there will be corresponding changes. It is the key to computer-aided analysis of planetary transmission by automatically constructing the rotational speed, the torque equation system of Shandong mold machine and generating the solution matrix.
The model construction area builds the transmission diagram, and the Zhangjiagang mill's property panel sets the characteristic parameters of the components of the planetary shifting system, such as the characteristic parameters of the planetary row, the working state of the operating member, the input speed, and the initial torque value (for convenience calculation, generally Set to unit 1), click on the calculation to get the speed torque of each component of the transmission system.
Table 1 shows the speed and torque of the sun gear, the ring gear and the carrier of the planetary row when the clutch 2 is combined and the brake 4 is braked (denoted as C2B4); the gear information of the planetary shifting mechanism includes the operation under the gear Component handling, gear ratio and efficiency.
(1) Through the analysis of the characteristics of vehicle planetary transmission, the general model of planetary transmission calculation and analysis is established, and the computer aided analysis program of planetary transmission system is developed. It can automatically write and solve the planetary transmission system speed and torque balance equations. The gear transmission analysis, transmission ratio and efficiency calculation of the planetary transmission system, as well as the calculation of the rotational speed and torque of each component of the planetary transmission system, effectively improve the design and analysis efficiency of the planetary transmission system.
(2) Computer calculus based on mathematical expressions, developed the 71st Tang Zhenghua et al.: Computer-aided analysis technology of planetary transmission system, automatic construction program sub-module of speed and torque equation, which can dynamically construct the speed of planetary transmission system, The torque balance matrix equation has strong versatility and practicability.
Establishment of computer analysis model for planetary transmission system