CN108317206B - electromagnetic shunt damper system with variable mechanical behavior - Google Patents
electromagnetic shunt damper system with variable mechanical behavior Download PDFInfo
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- CN108317206B CN108317206B CN201710037710.5A CN201710037710A CN108317206B CN 108317206 B CN108317206 B CN 108317206B CN 201710037710 A CN201710037710 A CN 201710037710A CN 108317206 B CN108317206 B CN 108317206B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
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- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
- Vibration Prevention Devices (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
the invention provides an electromagnetic shunt damper system with variable mechanical behavior, which comprises: the permanent magnet motor is used for converting kinetic energy into electric energy; the mechanical system analog circuit is used for converting electric energy into equivalent mass, rigidity and damping coefficient; and the negative impedance compensation circuit is used for generating a compensation negative resistance so as to offset the internal resistance of the electromagnetic shunt damper. Specifically, the inherent internal resistance of the mechanical system analog circuit is offset through the compensation negative resistance generated by the compensation component formed by the voltage reversal negative impedance converter (VNIC), and the quality, the rigidity and the damping coefficient representing the damping performance are calculated by the mechanical system analog circuit according to the analog relation between the mechanical system and the electrical system, so that the effect of adjusting the responding damping performance by adjusting the electrical parameters of the mechanical system analog circuit is achieved. The compensation assembly can reduce the inherent internal resistance of the motor and other electrical elements, so that the whole system can generate better damping performance.
Description
Technical Field
The invention relates to the technical field of electromagnetic dampers, in particular to an electromagnetic shunt damper system with variable mechanical behaviors.
Background
Structural vibration control is very important for structural protection. Various dampers (passive, semi-active and active modes) have been used to suppress harmful vibrations of civil and mechanical structures, for example, viscoelastic dampers, fluid viscous dampers, Tuned Mass Dampers (TMD), Magnetorheological (MR) dampers, Active Mass Dampers (AMD) and Tuned Inertial Dampers (TID), among others. Each type of damper corresponds to its only preferred field of application with specific requirements. In general, actively controlled dampers can provide better damping performance than passive dampers at the expense of requiring an external power supply and a feedback system, but this can lead to complex design and possible system instability problems during actual operation. Passive dampers have a higher utility and robustness, but conventional passive dampers provide limited control. Semi-active dampers achieve a compromise between active and passive dampers by enhancing or changing the performance of the passive damper and making its energy consumption less than that of the active damper.
with the rapid growth of economy and strong industrial demands, there is a need for a damper with preferably adjustable mechanical behavior, which can simulate and integrate the various dampers mentioned above. The rapidly developing electromagnetic shunt damper (EMSD) in recent years shows its advantages in simulating the relationship between mechanical and electrical systems, which is capable of simulating mass, stiffness and damping using electrical components. By replacing mechanical components with electrical components, EMSD has the advantages of compact size and simple and low cost to maintain. The EMSD can also shunt energy away from the damper locations to prevent the damper overheating problems that often occur in conventional dampers.
however, existing EMSD systems have an inherent internal resistance compared to mechanical dampers, which in practice results in two main drawbacks as listed below: (1) the internal resistance of existing EMSD designs generally limits the best achievable damping performance of the damper, in other words, the internal resistance limits the upper limit of the best achievable damping ratio; (2) in the engineering field, inductance and capacitance elements without internal resistance are difficult or impossible to realize. This limits the further complexity of the shunt damper design, for example, when EMSD simulates Tuned Inertial Damper (TID) with parallel stiffness, the presence of the motor internal resistance will always result in a series equivalent damping and thus affect the damper design.
disclosure of Invention
The invention aims to provide an electromagnetic shunt damper system with variable mechanical behavior so as to provide a novel small mechanical system simulation circuit capable of simulating various mechanical properties of various conventional dampers.
In one aspect, an embodiment of the present invention provides an electromagnetic shunt damper system with a variable mechanical behavior, including: the permanent magnet motor is used for converting kinetic energy into electric energy;
the mechanical system simulation circuit is connected with the permanent magnet motor and used for converting the electric energy into equivalent mechanical parameters, and the mechanical parameters comprise mass, rigidity and damping coefficients;
And the negative impedance compensation circuit is connected with the mechanical system analog circuit and used for generating a compensation negative resistance and compensating the internal resistance of the mechanical system analog circuit so as to adjust the numerical values of the mass, the rigidity and the damping coefficient.
Preferably, the negative impedance compensation circuit is a voltage-inverting negative impedance converter.
preferably, the voltage-inverting negative impedance converter comprises an operational amplifier, a first resistor, a second resistor, and a third resistor, wherein,
the first end of the first resistor is grounded, and the second end of the first resistor is connected to the first end of the second resistor and the non-inverting input end of the operational amplifier;
the first end of the second resistor is also connected to the non-inverting input end of the operational amplifier, and the second end of the second resistor is connected to the output end of the operational amplifier and the sliding end of the third resistor;
the third resistor is a variable resistor, the sliding end of the third resistor is also connected to the output end of the operational amplifier, and the other end of the third resistor is connected to the inverting input end of the operational amplifier.
Preferably, the voltage-inverting negative impedance converter further comprises a first power supply and a second power supply for supplying energy to the operational amplifier.
preferably, the first resistor and the second resistor have the same resistance value.
Preferably, the electromagnetic shunt damper further comprises a single-pole double-throw switch, one end of the single-pole double-throw switch is connected to the mechanical system analog circuit, and the other end of the single-pole double-throw switch is grounded or connected to the voltage reversal negative impedance converter, wherein when the other end of the single-pole double-throw switch is grounded, the electromagnetic shunt damper system is a passive damping system, and when the other end of the single-pole double-throw switch is connected to the reversal input end of the voltage reversal negative impedance converter, the electromagnetic shunt damper system is a semi-active damping system.
Preferably, the mechanical system simulation circuit comprises an electromagnetic damper and a shunt circuit.
Preferably, the shunt circuit comprises one or more of a resistor, an inductor, and a capacitor.
Preferably, the mechanical system simulation circuit calculates the mass, the stiffness, and the damping coefficient by the following equations:
where m, c, K represent the mass, the damping coefficient and the stiffness, respectively, R, L, C represents the resistance, inductance and capacitance of the mechanical system analog circuit, and K em is the mechanical constant of the electromagnetic damper.
the embodiment of the invention has the following beneficial effects: according to the embodiment of the invention, the inherent internal resistance of the mechanical system analog circuit is offset by the compensation negative resistance generated by the negative impedance compensation circuit formed by the voltage reverse negative impedance converter, and the quality, the rigidity and the damping coefficient representing the damping performance are calculated by the mechanical system analog circuit according to the analog relation between the mechanical system and the electrical system. The introduction of the negative impedance compensation circuit can reduce the inherent internal resistance of the motor and other electrical elements, and can enable the whole system to generate better damping performance; the system is enabled to select between semi-active control and passive control by a single pole double throw switch.
drawings
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an electromagnetic shunt damper system with variable mechanical behavior according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a negative impedance compensation circuit of the variable mechanical behavior electromagnetic shunt damper system of FIG. 1;
fig. 3 is a schematic structural diagram of an electromagnetic shunt damper system with variable mechanical behavior according to a second embodiment of the present invention;
FIG. 4 illustrates the case of stiffness and damping coupling simulated using inductance;
FIG. 5 illustrates a case of simulating pure stiffness;
FIG. 6 illustrates the mass and damping coupling simulated using capacitance;
Fig. 7 shows the case of simulated pure quality.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
An embodiment of the present invention provides an electromagnetic shunt damper system with a variable mechanical behavior, and referring to fig. 1, the electromagnetic shunt damper system with a variable mechanical behavior may include:
A permanent magnet motor 10 for converting kinetic energy into electric energy;
The mechanical system simulation circuit 20 is connected to the permanent magnet motor 10 and is used for converting the electric energy into equivalent mechanical parameters, wherein the mechanical parameters comprise mass, rigidity and damping coefficient;
And the negative impedance compensation circuit 30 is connected to the mechanical system analog circuit 20 and is used for generating a compensation negative resistance to compensate the internal resistance of the mechanical system analog circuit so as to adjust the values of the mass, the rigidity and the damping coefficient.
in the present embodiment, the permanent magnet motor 10 is responsible for converting kinetic energy into electric energy, which is further transmitted to the adjacent mechanical system simulation circuit 20; the negative impedance compensation circuit 30 generates a compensation negative resistance to eliminate the resistance inside the mechanical system analog circuit 20; then, the mechanical system simulation circuit 20 converts the electric energy into equivalent mass, stiffness and damping coefficient according to the simulation relationship between the mechanical system and the electrical system. Compared with the traditional damper, the electromagnetic shunt damper system can achieve higher damping performance due to the fact that the negative impedance compensation circuit 30 is introduced to eliminate inherent resistance inside a mechanical system analog circuit.
Specifically, referring to fig. 2, the negative impedance compensation circuit 30 is a voltage-inverting negative impedance converter, and may include an operational amplifier 310, a first resistor 320, a second resistor 330, a third resistor 340, a first power supply 350, and a second power supply 360. A negative resistance (-R) can be generated by the voltage-inverting negative impedance converter to eliminate the inherent resistance R generated inside the mechanical system analog circuit 20.
As shown in fig. 2, a first terminal of the first resistor 320 is grounded, and a second terminal of the first resistor 320 is connected to a first terminal of the second resistor 330 and a non-inverting input terminal of the operational amplifier 310; the first terminal of the second resistor 330 is further connected to the non-inverting input terminal of the operational amplifier 310, and the second terminal of the second resistor 330 is connected to the output terminal of the operational amplifier 310 and the sliding terminal of the third resistor 340; the third resistor 340 is a variable resistor, the sliding end of the third resistor 340 is further connected to the output end of the operational amplifier 310, and the other end of the third resistor 340 is connected to the inverting input end of the operational amplifier 310.
Further, the first resistor 320 and the second resistor 330 have the same resistance. Therefore, by adjusting the resistance of the third resistor 340, the whole voltage-reversal negative impedance converter can generate a negative resistance (-R) to eliminate the inherent resistance R generated inside the mechanical system analog circuit 20.
further, the voltage-inverting negative impedance converter further includes a first power supply 350 and a second power supply 360 for supplying power to the operational amplifier 310.
In the present embodiment, the mechanical system simulation circuit 20 includes an electromagnetic damper and a shunt circuit. Wherein the mechanical system analog circuit calculates the mass, the stiffness, and the damping coefficient by:
Where m, c, K represent the mass, the damping coefficient and the stiffness, respectively, R, L, C represents the resistance, inductance and capacitance of the mechanical system analog circuit, and K em is the mechanical constant of the electromagnetic damper.
In the embodiment, the inherent internal resistance of the mechanical system analog circuit is offset by the compensation negative resistance generated by the negative impedance compensation circuit formed by the voltage reversal negative impedance converter, and the quality, the rigidity and the damping coefficient representing the damping performance are calculated by the mechanical system analog circuit according to the analog relation between the mechanical system and the electrical system. The introduction of the negative impedance compensation circuit can reduce the inherent internal resistance of the permanent magnet motor and other electrical elements, and can enable the whole system to generate better damping performance. The damping performance of the damper can be adjusted by adjusting the electrical parameters of the mechanical system analog circuit.
Figure 4 shows the case of stiffness and damping coupling simulated using inductance. Similarly, FIG. 6 shows the case of mass and damping coupling modeled using capacitance. The damping in fig. 4 and 6 is caused by the circuit internal resistance. As can be seen from a comparison of fig. 4 and 5, and fig. 6 and 7, the introduction of the negative impedance compensation circuit (fig. 5 and 7) can cancel the internal resistance of the circuit to separate the equivalent damping generated by the internal resistance from the design criteria, which makes it possible to optimize the circuit control. Fig. 5 shows the case of successful simulation of pure stiffness. Fig. 7 shows the case of simulated pure quality.
Example two
fig. 3 is a schematic structural diagram of an electromagnetic shunt damper system with a variable mechanical behavior according to a second embodiment of the present invention. The second embodiment shown in fig. 3 differs from the first embodiment shown in fig. 1 in that it further comprises a single pole double throw switch 40. Specifically, referring to fig. 3, the variable mechanical behavior electromagnetic shunt damper system comprises:
A permanent magnet motor 10 for converting kinetic energy into electric energy;
The mechanical system simulation circuit 20 is connected to the permanent magnet motor 10 and used for converting the electric energy into equivalent mass, rigidity and damping coefficient;
A negative impedance compensation circuit 30 for generating a compensated negative resistance to compensate for the internal resistance of the mechanical system analog circuit to adjust the mass, the stiffness, and the damping coefficient;
And a single-pole double-throw switch 40 having one end connected to the mechanical system analog circuit 20 and the other end connected to ground or the negative impedance compensation circuit 30.
In this embodiment, when the other end of the single-pole double-throw switch 40 is grounded, the electromagnetic shunt damper system is a passive damping system, the negative impedance compensation circuit 30 is not connected to the mechanical system analog circuit 20, and the permanent magnet motor 10 is responsible for converting kinetic energy into electric energy, which is further transmitted to the adjacent mechanical system analog circuit 20; the mechanical system simulation circuit 20 converts the electric energy into equivalent mass, stiffness and damping coefficient according to the simulation relationship between the mechanical system and the electrical system.
Further, when the other end of the single-pole double-throw switch 40 is connected to the negative impedance compensation circuit 30, the electromagnetic shunt damper system is a semi-active damping system. Specifically, as shown in fig. 3, the negative impedance compensation circuit 30 is a voltage-inverting negative impedance converter, and may include an operational amplifier 310, a first resistor 320, a second resistor 330, a third resistor 340, a first power supply 350, and a second power supply 360. A first end of the first resistor 320 is grounded, and a second end of the first resistor 320 is connected to a first end of the second resistor 330 and a non-inverting input terminal of the operational amplifier 310; the first terminal of the second resistor 330 is further connected to the non-inverting input terminal of the operational amplifier 310, and the second terminal of the second resistor 330 is connected to the output terminal of the operational amplifier 310 and the sliding terminal of the third resistor 340; the third resistor 340 is a variable resistor, the sliding end of the third resistor 340 is further connected to the output end of the operational amplifier 310, and the other end of the third resistor 340 is connected to the inverting input end of the operational amplifier 310. The other end of the single-pole double-throw switch 40 is connected to the reverse input end of the voltage reverse negative impedance converter, so that the negative impedance compensation circuit 30 is connected to the mechanical system analog circuit 20, and the permanent magnet motor 10 is responsible for converting kinetic energy into electric energy which is further transmitted to the adjacent mechanical system analog circuit 20; the negative impedance compensation circuit 30 generates a compensation negative resistance to eliminate the resistance inside the mechanical system analog circuit 20; the mechanical system simulation circuit 20 converts the electric energy into equivalent mass, stiffness and damping coefficient according to the simulation relationship between the mechanical system and the electrical system. Through the negative impedance compensation circuit, the inherent internal resistance of the permanent magnet motor and other electrical elements can be reduced, and the whole system can generate better damping performance.
The present embodiment enables the system to make immediate damper parameter adjustments and mode selection between semi-active control and passive control through a single pole double throw switch. When the other end of the single-pole double-throw switch is grounded, the whole system is a passive control system. When the single-pole double-throw switch is connected with the reverse input end of the operational amplifier, the compensation negative resistance generated by the negative impedance compensation circuit formed by the voltage reverse negative impedance converter is used for offsetting the inherent internal resistance of the mechanical system analog circuit, and the mechanical system analog circuit is used for calculating the mass, the rigidity and the damping coefficient representing the damping performance according to the analog relation between the mechanical system and the electrical system. Therefore, the inherent internal resistance of the permanent magnet motor and other electrical elements can be reduced, and the whole system can generate better damping performance.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. An electromagnetic shunt damper system with variable mechanical behavior, comprising:
The permanent magnet motor is used for converting kinetic energy into electric energy;
The mechanical system simulation circuit is connected with the permanent magnet motor and used for converting the electric energy into equivalent mechanical parameters, and the mechanical parameters comprise mass, rigidity and damping coefficients;
the negative impedance compensation circuit is connected with the mechanical system simulation circuit and used for generating a compensation negative resistance and compensating the internal resistance of the mechanical system simulation circuit so as to adjust the numerical values of the mass, the rigidity and the damping coefficient; the negative impedance compensation circuit is a voltage reversal negative impedance converter; the voltage-inverting negative impedance converter comprises an operational amplifier, a first resistor, a second resistor and a third resistor, wherein,
The first end of the first resistor is grounded, and the second end of the first resistor is connected to the first end of the second resistor and the non-inverting input end of the operational amplifier;
The first end of the second resistor is also connected to the non-inverting input end of the operational amplifier, and the second end of the second resistor is connected to the output end of the operational amplifier and the sliding end of the third resistor;
The third resistor is a variable resistor, the sliding end of the third resistor is also connected to the output end of the operational amplifier, and the other end of the third resistor is connected to the inverting input end of the operational amplifier.
2. a mechanical variable electromagnetic shunt damper system according to claim 1, wherein said voltage inverting negative impedance transformer further comprises a first power supply and a second power supply for energizing said operational amplifier.
3. A variable mechanical behavior electromagnetic shunt damper system according to claim 1, wherein said first resistor and said second resistor have equal resistance values.
4. The variable mechanical behavior electromagnetic shunt damper system according to claim 1, further comprising a single-pole double-throw switch, one end of the single-pole double-throw switch being connected to the mechanical system analog circuit, and the other end of the single-pole double-throw switch being connected to ground or to the voltage-reversal negative impedance converter, wherein when the other end of the single-pole double-throw switch is connected to ground, the electromagnetic shunt damper system is a passive damping system, and when the other end of the single-pole double-throw switch is connected to the reverse input end of the voltage-reversal negative impedance converter, the electromagnetic shunt damper system is a semi-active damping system.
5. a variable mechanical behavior electromagnetic shunt damper system according to claim 1, wherein said mechanical system simulation circuit comprises an electromagnetic damper and a shunt circuit.
6. A variable mechanical behavior electromagnetic shunt damper system according to claim 5, wherein said shunt circuitry comprises one or more of a resistor, an inductor, a capacitor.
7. The variable mechanical behavior electromagnetic shunt damper system of claim 5, wherein said mechanical system simulation circuit calculates said mass, said stiffness, and said damping coefficient by the following equations:
where m, c, K represent the mass, the damping coefficient and the stiffness, respectively, R, L, C represents the resistance, inductance and capacitance of the mechanical system analog circuit, and K em is the mechanical constant of the electromagnetic damper.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3941402A (en) * | 1975-03-03 | 1976-03-02 | Yankowski Anthony P | Electromagnetic shock absorber |
| CN1084620A (en) * | 1992-09-25 | 1994-03-30 | 中国人民解放军二炮第一研究所 | Magnetic spring with negative coefficient of elasticity |
| CN102027683A (en) * | 2008-05-13 | 2011-04-20 | 高通股份有限公司 | Method and apparatus with negative resistance in wireless power transfers |
| CN204222577U (en) * | 2014-11-14 | 2015-03-25 | 徐州华夏电子有限公司 | The ultra-magnetic telescopic vehicle suspension shock attenuation unit of resonant frequency autotracking |
| CN104595402A (en) * | 2015-01-23 | 2015-05-06 | 西安交通大学 | Electromagnetic branch circuit damping vibration absorber adopting ring-shaped permanent magnet |
| CN105257750A (en) * | 2015-11-19 | 2016-01-20 | 西安空间无线电技术研究所 | Multi-model electromagnetic vibration absorber |
-
2017
- 2017-01-18 CN CN201710037710.5A patent/CN108317206B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3941402A (en) * | 1975-03-03 | 1976-03-02 | Yankowski Anthony P | Electromagnetic shock absorber |
| CN1084620A (en) * | 1992-09-25 | 1994-03-30 | 中国人民解放军二炮第一研究所 | Magnetic spring with negative coefficient of elasticity |
| CN102027683A (en) * | 2008-05-13 | 2011-04-20 | 高通股份有限公司 | Method and apparatus with negative resistance in wireless power transfers |
| CN204222577U (en) * | 2014-11-14 | 2015-03-25 | 徐州华夏电子有限公司 | The ultra-magnetic telescopic vehicle suspension shock attenuation unit of resonant frequency autotracking |
| CN104595402A (en) * | 2015-01-23 | 2015-05-06 | 西安交通大学 | Electromagnetic branch circuit damping vibration absorber adopting ring-shaped permanent magnet |
| CN105257750A (en) * | 2015-11-19 | 2016-01-20 | 西安空间无线电技术研究所 | Multi-model electromagnetic vibration absorber |
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