Research On Key Technology Of The Antiresonant Vibration Machine

Currently there are nearly a hundred kinds of vibration machine. Its application extends over all departments of the national economy. The anti-rensonant vibration machines (ARVM) have a series of advantage than traditional vibration machine, such as, light body, good vibration isolation effect, small exciting force, stable performance, energy saving. Its application prospects are broad. Due to some key technology is not resolved, in result the ARVM has not yet been popularized to this day. This thesis aimes at several key technical problems and theoretical issues of ARVM, some depth study is done, the main works and achievements are as follows:(1) Anti-vibration theory of mechanical network is elements of ARVM. Using mechanical impedance method and mechanical-electrical simulation method dynamic analysis of Series connection system with mass-spring is done.The phenomenons of resonance and anti-resonance and the principle of three kinds of ARVM are discussed. Anti-resonant vibration isolation technology applied to vibration machine, two new-style anti-resonant isolation vibration machines (AIVM) are put forward, including AIVM with single mass and AIVM with double masses. By dynamics analysising, computer simulationing and testbed trialing, it is proved that the dynamic load passed to base of AIVM with single mass is less than one of the traditional first isolation vibration machine and closing to the traditional second isolation vibration machine. Isolation effect of AIVM with double masses is better than the traditional vibration machine with first isolation or second isolation, and its whole weight less than ordinary second isolation vibration machinery.(2) To take a Driving point ARVM as an example, the paper analyzed the influence of the mass ratio, anti-resonance frequency ratio, damping ratio and frequency ratio on the amplitudes of the upper and lower body and on power transfer rate. The three kinds of parameters selection method are proposed, including "to make the point of anti-resonant locating in the middle between two points of resonant vibration."," to make the amplitude of the upper body turning into smallest when anti-resonant vibration happens." and " the comprehensive method between the above two methods ". The condition equations corresponding with these three methods are established respectively, and the computer simulation and experimental research are completed.(3) To consider the random fluctuation of materials mass, the dynamic analysis of the ARVM are taked based on random perturbation method.The influences of random fluctuation of materials msss on the amplitudes of the upper and lower body are studied on condition that the parameters combination of the upper and lower body is different and average of material mass is changing. The law is found that random fluctuating of material mass on amplitudes of upper and lower body. The design level of ARVM is improved.(4) Modeling and solving of ARVM with inertial exciters are done as an electromechanical coupling system. The synchronous criterion and synchronization transmission criterion are established, and the synchronous stability criterion and synchronization transmission stability criterion are derived in the anti-resonance condition. By use of theories and tests it is proved that both vibratory synchronization and vibratory synchronization transmission can be realized in the anti-resonance condition. Theoretical analysis shows that synchronicity index are always far larger than the synchronization transmission index. Therefore as long as the synchronization transmission can be realized, self-synchronization can be certainly realized. But on condition that the self-synchronization can be realized the vibratory synchronization transmission can not be always realized. The correctness of the above results is verified by the experiments.(5) Aiming at some special occasions that material mass changes in a manner of ladders, three kinds control strategy are put forward in order to make amplitude of the upper and lower body of ARVM steady. For an example of the control method, that the anti-resonance point located in middle between two resonance points and only the amplitude of upper body is monitored, the experimental studys are carried out. An anti-resonant amplitude control test system is designed. This system consists of mechanical equipment, hardware control platform and software control programs."Genie "configuration software is the platform of the Control program and fuzzy self-tuning PID parameters controller is the core of the Control program. Tests show that the control method is effective and has practical value.(6) This thesis applys ARVM’s design theory to actual production. We have carried out a three-dimensional structure design for an anti-resonant vibration screen being used in the metallurgical industry. Using the virtual prototype technology, we have realized a prediction study of Stiffness, strength and process performance for the anti-resonant vibration screen. Finally we have developed the first anti-resonant vibration screen in world, and we debug the screen in the no-load and load conditions. The measures and tests results show that technical indexes of the screen meet the design requirements, and the screen has good effect of vibration isolation. The exciting force of the screen decreased by about30%than the traditional screen, and noise of the screen reduct to90dB from the120dB. Synchronization of the screen has good performance, and start-stop of the screen is very smooth, and the amplitude of the screen fluctuates less with material. In condition of the absence of the computer control the screen has reached the actual production requirements. Although the weight of the screen is greater than the weight of the single body vibrating screen with same processing capacity, its weight is much lighter than the weight of the double body vibrating screen with second vibration isolation. We have applied the national invention patent.