(57) Abstract:The invention relates to the field of engineering, namely by means of an active vibration isolation of various objects. The objective of the invention is to increase the effectiveness of vibration isolation at low frequencies by introducing invariant control providing a full stop in inertial space of the protected object. 5 Il. The invention relates to the field of engineering, namely by means of an active vibration isolation of various objects.The known method of vibration isolation on author.St. N 1521955, CL F 16 F 15/06, 1987, lies in the fact that vibroisolation object to provide a minimum five areas with additional platform with lever mechanisms.Closest to the present invention is a method of vibration isolation on author. St. N 1087717, CL F 16 F 15/00, 1981, namely, that on the object and on the basis set accelerometers, and between them is placed the sensor relative movement and active Executive authority with the control device, providing at least move vibroisolating object.The disadvantage of this method is sravnitel the management system the ability to produce Executive body speed, equal in magnitude and opposite in sign to the absolute velocity of the base, i.e. the absence of invariant control in the control device.The objective of the invention is to increase the effectiveness of vibration isolation at low frequencies by introducing invariant control providing a full stop in inertial space of the protected object.This is achieved by the method of vibration, namely, that on the object and on the basis set accelerometers, and between them is placed the sensor relative movement and active Executive authority with the control device, providing a minimum of a moving object, the control device further comprises a digital controller, and between the object and the basis of introducing additional elastically damped pad with on her dynamometer, and the Executive body is placed between the object and the pad, set it to the speed sensor and deliver it in the form of the generator speed, and the signals from the accelerometers, speed sensors and the relative movement and dynamometer sent to the digital controller, the output of which is connected to the input of the Executive body, and ousia using observer States for the case when the relative movement of the object is within the acceptable level and the generator speed with regard to the absolute velocity of the secondary site creates a relative velocity equal in magnitude and opposite in direction, and the second mode is associated with the use of a proportional controller with positioning level for the case when the relative movement of the object is beyond the permissible level movements.In Fig.1 shows a generalized scheme for the implementation of the proposed method, Fig.2, 3, 4 - schematic of the method, respectively, using hydro-pneumatic, electro-mechanical and hydro-mechanical control systems; Fig. 5 diagram of the hysteresis algorithm on-off modes of operation of the control system.The method of vibration isolation is as follows.Object 1 vibroprotection install additional elastically damped platform 2 (see Fig.1, 3, 4) through the Executive body 3 made in the form of the generator speed, in the area 2 set the dynamometer 4 (for diagrams in Fig.1, 3, 4) or the flow meter 4' (for the circuit in Fig.2). Site 2 is associated with an intermediate platform 5 through a spring 6 (for diagrams in Fig.1,). Intermediate platform 5 has an elastic damping connection 8 with a rough base 9. On the object 1 and the intermediate platform 5 set the accelerometers 10 and 11, and between the sensor 12 relative movement. At the Executive body 3 place the sensor 13 speed (for diagrams in Fig.1 and 3) or the flow sensor 13' (for the circuit in Fig. 2 and 4). Executive body for electro-mechanical control system (see Fig.3) is designed as a worm gear with an electric motor (not shown) and the lever parallelogram mechanism. For hydro-pneumatic and hydro-mechanical systems is a hydraulic cylinder with a piston. Output signals from the speed sensors, the relative movement, accelerometers and come in a digital dynamometer controller 14, which is essentially an on-Board computer in the control circuit and which is a transducer 15 (for example, electrohydraulic for the circuit in Fig.4) produces for the Executive authority to manage the impact depending on the ratios of the relative movement and an acceptable level.The algorithm of the computer 14 based on the use of digital observer States. The isolation system has two modes of operation, providing the of esani.The first mode (I)- invariant control that provides a complete stop in inertial space of the protected object 1. This statement is true in a certain range of low frequencies, starting from zero. Vibration of a higher frequency is reduced due to the properties of the passive vibration isolation. It should be noted that absolute zero acceleration on the object 1 cannot be achieved and also due to inaccuracies in the measurement system and control, due to the nonlinearities of the characteristics of mechanical elements of a vibration isolation system made in the model used in the observer as linear.The second mode (II) - the positioning mode.If the relative displacement x3measured by the sensor 12, is beyond the acceptable level, then the invariant mode I with the monitor off and on mode II. Then in the isolation system has a control law:
u3(i)=ky2(i) if y2(i)SS,
u3(i) a control signal;
y2(i) the signal from the sensor relative movement;
SS- the permissible level movements.The value of the coefficient k is chosen small enough to ensure the sustainability of the systems of the Fig.5). If the magnitude of the measured relative displacement y2(i) during shutdown mode I exits tube1< y2(i) < -1the mode I off and on mode II. When relative movement is inside tube2y2(i) 2the mode II off and on mode I. Here1- the permissible level relative movement when the invariant is running, above which and disabling invariant control is guaranteed 100% or with a given probability) will not be output to the stop loss and damping properties;2- the level of the relative movement, below which it can be considered that the isolation system when disconnected invariant control is guaranteed to have gone from the extreme positions and again, you can enable the invariant control.The proposed method of vibration isolation can be used in active electro-mechanical, hydro-mechanical and hydro-pneumatic systems, vibration isolation, including the suspension of vehicles that will significantly increase their comfort. The method of isolation, namely, that the object and the basis set accelerometers, and between them rivalship at least move the object, characterized in that the control device is further added digital controller, between the object and the base install additional providentially pad with on her dynamometer, the Executive body is placed between the object and the pad, set it to the speed sensor, and the signals from the accelerometers, dynamometer, speed sensors and the relative movement is sent to the digital controller, the output of which is connected to the input of the Executive body, and the digital controller operates in two modes: the first mode (I) - invariant control that provides a complete stop in inertial space of the protected object; the second mode (II) - the positioning mode, and if the relative movement is beyond the acceptable level, then the invariant mode I off and on mode II, the isolation system creates a control law
U3(i) = KU2(i) if Y2(i)daboutp,
moreover, if the value of the measured relative displacement Y2(i) during shutdown mode I is within
1< y2(i) < -1< / BR>the mode I off and on mode II, and if the camping and mode I,
where U3(i) a control signal;
Y2(i) the signal from the sensor relative movement;
SSdaboutp- the allowable displacements;
K - coefficient, which is selected from the condition of stability of the system;
1- the permissible level relative movement when the invariant is running, above which and disabling invariant control is guaranteed to not occur out on the way and will not be loss-proof properties;
2- the level of the relative movement, below which it can be considered that the isolation system when disconnected invariant control is guaranteed to have gone from the extreme positions and is ready to activate the invariant control.
FIELD: transport engineering.
SUBSTANCE: invention can be used in large-size heavy-weight trailer-trains. Proposed dump semitrailer contains frame with two longitudinal beams made of H-channels and turnable body resting on frame. Dump semitrailer is furnished with spring locking devices installed over middle and rear axles of wheels from inner and outer sides of left-hand and right-hand channels and they contains, each, two disks secured in pairs on turnable shaft passed through channel and are provided with shaped cut with locking section and cylindrical rod with fitted-on bushings arranged in shaped cut of disks and elongated slots of channel. Said cylindrical rod is connected with wheel axles through two posts hinge-connected with clamps. Locking device control hydraulic drive contains hydraulic distributor and hydraulic cylinder with connected with disks of locking devices arranged over middle axles of wheels, and is connected through tie-rod with disks over rear axles of wheels.
EFFECT: improved stability and safety at unloading of large-size heavy-weight dump semitrailers, preservation of maneuverability of vehicles, improved convenience and increased speed of unloading.