CN201464493U

CN201464493U - Flexible pendulum accelerometer

Info

Publication number: CN201464493U
Application number: CN200920109709XU
Authority: CN
Inventors: 何静; 郭晓芳; 薛旭; 严小军
Original assignee: China Aerospace Times Electronics Corp
Current assignee: China Aerospace Times Electronics Corp; Beijing Aerospace Control Instrument Institute
Priority date: 2009-07-03
Filing date: 2009-07-03
Publication date: 2010-05-12
Anticipated expiration: 2019-07-03

Abstract

The utility model relates to a flexible pendulum accelerometer, which comprises a shell, a flexible rod, a torquer moving coil, a torquer stator, a signal sensor, a triangular pendulous reed and a servo amplifier. The torquer stator consists of a yoke iron and a permanent magnet. The signal sensor consists of a signal sensor moving coil and a signal sensor stator. The shell is filled with damping liquid. The triangular pendulous reed, the torquer moving coil and the signal sensor moving coil form a swing component which is elastically connected with the shell of an instrument through the flexible rod. The torquer stator and the torquer moving coil form a torquer. Compared with the traditional jeweled bearing supporting manner, the utility model adopts the flexible supporting manner and eliminates coulomb friction force caused by a shaft point and the jeweled bearing. At the same time, the flexible support has small rigidity in the sensitive direction of the accelerometer and has large rigidity in other directions. The measurement precision and the shake and impact resistant capability of the instrument are improved. Compared with the quartz flexible pendulum accelerometer adopting air damping, the utility model adopts the liquid damping and has good overload capacity and impact resistant capability.

Description

A kind of flexible pendulous accelerometer

Technical field

The utility model relates to a kind of flexible pendulous accelerometer, particularly a kind of oil-filled metal flexible material is as the pendulous accelerometer of support pattern, the acceleration sensor that can be used for Aero-Space inertia measurement and inertial navigation also can be used as the comparatively abominable vehicle-mounted acceleration analysis element of environment.

Background technology

Traditional pendulous accelerometer is divided into jewel bearing pendulous accelerometer, liquid floated pendulous accelerometer and flexible pendulous accelerometer by its support pattern, with regard to the jewel bearing pendulous accelerometer, detecting quality is fixed on the single pendulum, the other end of activity system is hinged on the housing by jewel bearing, and adopt the jewel bearing support pattern to exist intrinsic Coulomb friction power to overcome, certainly will reduce the precision of instrument; With regard to liquid floated pendulous accelerometer, the detection quality is floated by liquid and is suspended in the housing, and with jewel bearing supporting location, though a part of Coulomb friction power that adopted the floating technology balance of liquid, but friction force remains existence, and adopts the liquid over draft mode of holding to increase design, the technology difficulty of system; With regard to flexible pendulous accelerometer, quartz flexible pendulous accelerometer (abbreviation quartz watch) commonly used at present adopts quartz material as the flexibility bar supporting material, because quartz material tensile strength is low, fragile, add gauge internal and adopt air damping, cause its shock resistance and big overload capacity relatively poor.

The utility model content

Technology of the present utility model is dealt with problems and is: overcome the deficiencies in the prior art, a kind of flexible pendulous accelerometer is provided, this accelerometer precision height, strong shock resistance.

Technical solution of the present utility model is: a kind of flexible pendulous accelerometer, comprise housing, flexibility bar, the torquer moving-coil, the torquer stator of forming by yoke and permanent magnet, the signal transducer of forming by signal transducer moving-coil and signal transducer stator, triangle pendulum and servoamplifier, be full of damping liquid in the housing, the triangle pendulum, torquer moving-coil and signal transducer moving-coil are formed the pendulum assembly, the center mounting torque device moving-coil of triangle pendulum, the signal transducer moving-coil is installed on the top of triangle pendulum, the bottom connects two flexibility bars makes the pendulum assembly be connected with instrument housing elasticity, yoke is fixed on the middle part of housing, permanent magnet passes the torquer moving-coil, torquer stator and torquer moving-coil constitute torquer, the signal transducer stator is fixed on the housing and to connect sensor excitatory, when acceleration is imported, the displacement of the responsive pendulum of signal transducer assembly also is converted into electric signal, electric signal exports servoamplifier to by the signal transducer moving-coil, servoamplifier amplifies electric signal, feed back to the torquer moving-coil after the correction and produce feedback moment by torquer, this feedback moment makes the pendulum component recovery to the equilibrium position.

The flexibility bar entire body is a cylindricality, and middle symmetric position is processed into the circle of inflexions arc shape, and flexibility bar adopts beryllium-bronze material.The triangle pendulum is the isosceles triangle shape on plane, the pendulum center is left through hole and is used for mounting torque device moving-coil, the signal transducer moving-coil is installed on the top of triangle pendulum, position, two base angles respectively connects a flexibility bar, the triangle pendulum leaves 1 pair of through hole at least in center line symmetria bilateralis position, and the triangle pendulum adopts nonmagnetic duralumin material.

The utility model can also comprise the temperature compensation bellows that is used to compensate the damping liquid volume change, the temperature compensation bellows is installed in the housing, adopting beryllium-bronze material. can also comprise being used to attemperating unit that accelerometer is worked under isoperibol, attemperating unit is formed by being contained in heating plate, the thermosensitive wire in the housing and being contained in the outer temperature control electric bridge of housing, temperature sensitization apparatus is as a gage beam of temperature control electric bridge, and heating plate work is controlled in the output of temperature control electric bridge.

Principle of work of the present utility model is: when acceleration is imported, the pendulum assembly of being made up of triangle pendulum, torquer moving-coil and signal transducer moving-coil is subjected to the effect of moment of inertia and departs from the equilibrium position, this drift angle is detected by signal transducer, convert current signal to through servoamplifier, and be fed back to and be in the torquer in the stationary magnetic field and produce trimming moment again, make the pendulum component recovery to the equilibrium position, the size of output current and the acceleration of input are directly proportional, and therefore can be used as the electric measurement of acceleration.

The utility model advantage compared with prior art is:

(1) the utility model is owing to adopt the flexible support mode, compare the Coulomb friction power that pivot and jewel bearing brought of having eliminated with conventional gemstone bearing support pattern, symmetric position is processed into the circle of inflexions arc shape in the middle of the flexible support simultaneously, rigidity on the sensitive direction of accelerometer is very little, be similar to be and freely do not have restrained condition, rigidity in the other direction is then very big, has improved performance and measuring accuracy and the antivibration and the shock proof ability of instrument;

(2) employing liquid of the present utility model is compared and is adopted air-damped quartz flexible pendulous accelerometer as damping, the utlity model has overload capacity and impact resistance preferably.

(3) flexibility bar of the present utility model adopts beryllium-bronze material, compares quartz material and has higher tensile strength and not fragile.

(4) the triangle pendulum of the utility model employing is a flat shape, has reduced the moment of inertia of pendulum assembly; The symmetric position of triangle pendulum center line leaves through hole, reduced the gauge internal non-uniform temperature and the convection current moment that produces to the interference of pendulum.

(5) the utility model is provided with the temperature compensation bellows sensor is carried out temperature compensation in housing, offset because the volume change of the damping liquid that the damping liquid temperature variation causes, reduced drag effects, improved measuring accuracy, temperature control equipment is set inside and outside housing, be used for further having improved the measuring accuracy and the parametric stability of sensor to carrying out thermostatic control in the sensor.

(6) torquer of the utility model employing is the permanent magnetic moving winding torquer, adopts the push-pull type structure, has improved the linearity, and the permanent magnet material of torquer adopts 2:17 SmCo magnet steel, and degree of stability can reach 10 ^-6/ month magnitude (1 σ).

Description of drawings

Fig. 1 is a composition structural representation of the present utility model;

Fig. 2 is the vertical view of pendulum assembly for the composition structural drawing of the utility model pendulum assembly, Fig. 2 (a), and Fig. 2 (b) is the side view of pendulum assembly;

Fig. 3 is the outside drawing of the utility model flexibility bar, and Fig. 3 (a) is the vertical view of flexibility bar, and Fig. 3 (b) is the side view of flexibility bar;

Fig. 4 is the utility model signal transducer stator outside drawing, and Fig. 4 (a) is the contour structures of signal transducer stator, and Fig. 4 (b) is the winding mode of signal transducer stator.

Embodiment

The utility model is a kind of typical dynamic balance acceleration transducer, by flexible pendulum assembly, signal transducer, the push-pull type permanent magnet moment-meter, flexibility bar, compositions such as control circuit. as shown in Figure 1, this type accelerometer mainly comprises housing 1, flexibility bar 2, torquer moving-coil 3, the torquer stator of forming by yoke 6 and permanent magnet 7, the signal transducer of forming by signal transducer moving-coil 5 and signal transducer stator 4, triangle pendulum 8 and servoamplifier 9, be full of silicone oil as damping liquid in the housing 1, triangle pendulum 8, torquer moving-coil 3 is formed the pendulum assembly with signal transducer moving-coil 5, the center mounting torque device moving-coil 3 of triangle pendulum 8, signal transducer moving-coil 5 is installed on the top of triangle pendulum 8, the bottom connects two flexibility bars 2 makes the pendulum assembly be connected with instrument housing 1 elasticity, yoke 6 is fixed on the middle part of housing 1, permanent magnet 7 passes torquer moving-coil 3, torquer stator and torquer moving-coil 3 constitute torquer, signal transducer stator 4 is fixed on the housing 1 and to connect sensor excitatory, when acceleration is imported, the displacement of the responsive pendulum of signal transducer assembly also is converted into electric signal, electric signal exports servoamplifier 9 to by signal transducer moving-coil 5, servoamplifier 9 amplifies electric signal, feed back to torquer moving-coil 3 after the correction and produce feedback moment by torquer, this feedback moment makes the pendulum component recovery to the equilibrium position.

As shown in Figure 2, by pendulum 8, the pendulum assembly that sensor moving-coil 5 and flexibility bar 2 are formed is an activity system, its matrix is the pendulum 8 of a plane triangle, triangle pendulum 8 is an isosceles triangular structure, the pendulum center is left through hole and is used for mounting torque device moving-coil 3, form the push-pull type torquer with the permanent magnet 7 that is fixed on the housing, signal transducer moving-coil 5 is installed on the top of triangle pendulum 8, with field winding on ferrite be that sensor stator 4 is formed differential inductance transducers, the axis of sensor moving-coil and torquer coil is a quadrature in the space, the position, two base angles of pendulum 8 respectively sticks with glue a fixedly connected flexibility bar 2, supporting the pendulum assembly symmetrically, flexibility bar 2 is made by beryllium-bronze, triangle pendulum 8 leaves 1 pair of through hole at least in center line symmetria bilateralis position, leave 3 pairs of through holes among Fig. 2 shown in the utility model, make that the moment of inertia of pendulum assembly is less and reduce the gauge internal non-uniform temperature and the convection current moment that produces to the interference of pendulum, triangle pendulum 8 materials are nonmagnetic duralumin.Pendulum assembly barycenter is called pendulum length (l) to the distance in flexibility bar joint, is made up of the whole pendulum group quality between the sensor moving-coil 5 of flexibility bar 2 joints to pendulum group top installation and detects quality (m), and the product that detects quality and pendulum length is called pendulosity.The lower end of flexibility bar 2 is securely fixed on the pedestal by gluing again, can do small rotation (pact ± 10 ') round the flexibility bar joint by such structure pendulum assembly, and the operating angle of accelerometer only has the several seconds under closed-loop working state.As shown in Figure 3, the flexibility bar entire body is a cylindricality, middle symmetric position is processed into the circle of inflexions arc shape, make the rigidity of flexibility bar on the sensitive direction of accelerometer very little, be similar to be and freely do not have restrained condition, rigidity in the other direction is then very big, has improved performance and measuring accuracy and the antivibration and the shock proof ability of instrument.

The torquer that the utility model adopts is a voice coil loudspeaker voice coil differential type torquer, and a pair of torquer of forming differential type has identical structure, and the permanent magnet of two torquers is of the same name to the top, and permanent magnet material adopts 2:17 SmCo magnet steel, and degree of stability can reach 10 ^-6/ month magnitude (1 σ), yoke and permanent magnet are separately fixed on the symmetric position of watchcase, form the differential type torquer with the torquer coil on the pendulum group, when adding the square electric current and flowing through the torquer coil, the power that two torquers produce superposes, and has improved the efficient of torquer and has reduced nonlinearity erron.

As shown in Figure 4, sensor adopts differential moving-coil structure, signal transducer is a movably transformer of a kind of secondary coil, when utilizing secondary coil to move and the variation of primary coil mutual inductance produce output voltage, its two groups of magnetizing coils are respectively on a pair of " c " shape FERRITE CORE, shown in Fig. 4 (a), two " c " shape FERRITE CORE breach relatively, the centre leaves the gap and be fixed on and form sensor stator on the stator seat, two groups of field windings are connected in series, winding mode winds the line by 11 to 31 to 41 at last to 21 shown in Fig. 4 (b).Be contained in the moving-coil on the pendulum assembly, can in stator gap, move along gauge outfit input shaft direction, the variation of follower ring relative stator position, the induced voltage of output out of phase and amplitude, thus detect the signal that the assembly diverse location is put in reflection.

Owing to be filled with methyl-silicone oil in the instrument, improve the antivibration ability of instrument and increased damping, but vary with temperature, the silicone oil volume changes, variation for compensation silicone oil volume, the utility model also is equipped with the temperature compensation bellows in the housing of instrument, housing is cylindrical or square, wherein an end leaves oil-filled hole. and the temperature compensation bellows is made by beryllium-bronze, can extend or shorten with the variation of silicone oil volume in the instrument. temperature control element mainly comprises heating plate and the thermosensitive wire in the housing, these elements and temperature control electric bridge are formed attemperating unit, sensor is carried out thermostatic control, to improve the measuring accuracy and the parametric stability of instrument. the thermosensitive wire of attemperating unit is contained in the housing chamber, an arm as bridge for measuring temperature, when cavity temperature is lower than the working temperature of demarcation, bridge for measuring temperature is in non-equilibrium state, output signal feeds back to heating plate after by power amplifier again, the temperature of instrument is raise, be elevated to working temperature always, just stop when the bridge for measuring temperature of attemperating unit reaches equilibrium state.

Claims

1. flexible pendulous accelerometer, it is characterized in that: comprise housing (1), flexibility bar (2), torquer moving-coil (3), the torquer stator of forming by yoke (6) and permanent magnet (7), the signal transducer of forming by signal transducer moving-coil (5) and signal transducer stator (4), triangle pendulum (8) and servoamplifier (9), housing is full of damping liquid in (1), triangle pendulum (8), torquer moving-coil (3) is formed the pendulum assembly with signal transducer moving-coil (5), the center mounting torque device moving-coil (3) of triangle pendulum (8), signal transducer moving-coil (5) is installed on the top of triangle pendulum (8), the bottom connects two flexibility bars (2) makes the pendulum assembly be connected with instrument housing (1) elasticity, yoke (6) is fixed on the middle part of housing (1), permanent magnet (7) passes torquer moving-coil (3), torquer stator and torquer moving-coil (3) constitute torquer, signal transducer stator (4) is fixed on that housing (1) is gone up and it is excitatory to connect sensor, when acceleration is imported, the displacement of the responsive pendulum of signal transducer assembly also is converted into electric signal, electric signal exports servoamplifier (9) to by signal transducer moving-coil (5), servoamplifier (9) amplifies electric signal, feed back to torquer moving-coil (3) after the correction and produce feedback moment by torquer, this feedback moment makes the pendulum component recovery to the equilibrium position.

2. a kind of flexible pendulous accelerometer according to claim 1 is characterized in that: described flexibility bar (2) entire body is a cylindricality, and middle symmetric position is processed into the circle of inflexions arc shape.

3. a kind of flexible pendulous accelerometer according to claim 1 and 2 is characterized in that: described flexibility bar (2) is a beryllium-bronze material.

4. a kind of flexible pendulous accelerometer according to claim 1, it is characterized in that: described triangle pendulum (8) is plane isosceles triangle shape, triangle pendulum (8) center is left through hole and is used for mounting torque device moving-coil (3), signal transducer moving-coil (5) is installed on the top of triangle pendulum (8), and position, two base angles respectively connects a flexibility bar (2).

5. a kind of flexible pendulous accelerometer according to claim 4 is characterized in that: described triangle pendulum (8) leaves 1 pair of through hole at least in center line symmetria bilateralis position.

6. according to claim 1 or 4 or 5 described a kind of flexible pendulous accelerometers, it is characterized in that: described triangle pendulum (8) material is nonmagnetic duralumin.

7. a kind of flexible pendulous accelerometer according to claim 1 is characterized in that: described damping liquid is a methyl-silicone oil.

8. a kind of flexible pendulous accelerometer according to claim 1 is characterized in that: described is the push-pull type structure by torquer stator and torquer moving-coil (3) formation torquer, and the permanent magnet material of torquer adopts 2:17 SmCo magnet steel.

9. a kind of flexible pendulous accelerometer according to claim 1 is characterized in that: also comprise the temperature compensation bellows that is used to compensate the damping liquid volume change, described temperature compensation bellows is installed in the housing, adopts beryllium-bronze material.

10. according to claim 1 or 9 described a kind of flexible pendulous accelerometers, it is characterized in that: also comprise being used to attemperating unit that accelerometer is worked under isoperibol, attemperating unit is formed by being contained in heating plate, the thermosensitive wire in the housing and being contained in the outer temperature control electric bridge of housing, temperature sensitization apparatus is as a gage beam of temperature control electric bridge, and heating plate work is controlled in the output of temperature control electric bridge.