Inertial vibrating feeder; dynamic design; Matlab research direction electrical engineering electromechanical! d body eJoalElec廿ode inertial vibrating feeder is a vibration machine that uses vibration principle to complete various feeding processes. At present, such machinery has been widely used in various sectors such as industrial and agricultural production and national defense construction. The vibration tank can make the material slide or throw in a specified direction to achieve the purpose of conveying materials. The common point of this kind of vibration machinery and other machinery is that they are developing in the direction of large-scale, automation, integration and intelligence. The dynamic problems appearing in the work are more and more, and the requirements for dynamic characteristics are getting higher and higher. . Therefore, it is an indispensable task to carry out a more comprehensive and systematic design of the mechanical whole system and its components according to the dynamic design theory and method. It is an important measure and necessary to ensure the reliable and effective operation of this type of machinery and the whole system. Means. The dynamic design of the inertial vibrating feeder is to hope that the designed equipment can work under ideal conditions after being put into production, not only can obtain satisfactory technical indexes, but also require mechanical equipment to work reliably. At the same time, the working life requirements should be met.
1 The content of the dynamic design of the inertial vibrating feeder In order to effectively use the vibration to give the dynamic design of the vibrating feeder, it can be roughly divided into the following two aspects: in the preliminary design process, based on past experience and rationale; After the preliminary design, the designed mechanical structure is modeled, the dynamic characteristics are studied and analyzed, and the test analysis is carried out under the condition of possible date: 2(1)6-11-11, and the dynamic characteristics are tested, and then the mechanical equipment is The drawings are reviewed, modified or redesigned.
2 The steps and methods of dynamic design of inertial vibrating feeder The steps of dynamic design of vibrating machinery generally include the following aspects: calculation of kinematic parameters, dynamic modeling, dynamic characteristic analysis and dynamic parameter calculation, and measurement by experimental method. Out of the machine's modality, parameter identification, find out the revision criteria and problems that need to be modified, and modify the structure. 121. The above dynamic design usually uses analytical methods, numerical methods and experimental methods. The ideal is to combine these methods to achieve a close integration of theory and practice.
Calculation of kinematic parameters: The kinematic parameters that the vibrating feeder needs to select and calculate include: amplitude, frequency, direction of vibration direction, inclination of the working surface and motion trajectory. The principle of selecting these parameters is to find the best and second best materials. The state of motion, which in turn selects the best and second best kinematic parameters.
Dynamics Modeling 131: According to the characteristics of the inertial vibrating feeder, the finite element method is used to establish the kinetic equation as follows: The system is divided into several finite elements, and the unit coordinate system is selected. Calculate the inertia matrix, damping matrix, stiffness matrix and node force matrix of the element in the total coordinate system, ie determine the system coordinate vector U and the transformation matrix As of each element, and then calculate the inertia matrix M of the system, the damping matrix C stiffness matrix K and The node matrix F. corpse 1 establishes the motion differential equation in the overall coordinate system of the structure and then calculates the natural frequency, mode shape and dynamic response of the system according to the equation.
Dynamic Characteristic Analysis and Dynamic Parameter Calculation For the natural frequency and mode shape, the external force and damping can be omitted first, and the equation can be written as a displacement vector and an acceleration vector.
The above equation has the following form of solution U = XsinT (8). From the above equation, the natural frequency and mode shape of the system can be obtained. N degrees of freedom systems have N natural frequencies, each with a corresponding mode shape. In addition, it is also possible to coordinate the dynamic equations, transform the equations into the main coordinates or the normal coordinates, and then find the dynamic response of the system.
Experimental modalities and identification of system physical parameters The dynamic characteristics of the machine can be measured by experimentation. When measuring vibration, both input and output should be measured. By measuring the input and output, the frequency response function can be calculated, from which the dynamic characteristics of the system can be derived from the measured excitation and response.
The identification of modal parameters can be identified in the frequency domain or in the time domain.
Time domain signal-frequency domain signal transmission/+ function) transfer function parameter modal parameter number estimation identification modeling parameter identification time domain signal modeling mathematical model> modal parameter single motor vertical installation due to eccentric block rotation will generate periodic excitation The force F = mn2, decomposed into the force F along the direction of the force center O and the center of mass O, Fs = Focoscot, further decomposed into Fx and F., and the other component force Fz is perpendicular to the 00 along the Z axis. Where = Fosinot, Therefore, vibrations in three directions of x, y, and z are generated. Also, since the force O and the centroid O do not coincide, the moment generated by the Fz causes the rotation of the body, and only the rotation about the y-axis is considered here, which is represented by the angular displacement 0. According to Newton's law of motion and the equation of rotation, Xin Zhijie, Xu Yanshen. Dynamic design of ultrasonic honing vibration system. Combined machine tools and automated processing technology 2006 Hunan Nonferrous Metals, 2001. Chen Yongliang. Dynamic analysis of modular vibrating hopper based on finite element.
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