CN113191057B - Method and device for determining direction of unbalanced force - Google Patents
Method and device for determining direction of unbalanced force Download PDFInfo
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- 230000030279 gene silencing Effects 0.000 claims 4
- 238000004378 air conditioning Methods 0.000 description 4
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/02—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0021—Systems for the equilibration of forces acting on the pump
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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
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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Abstract
The invention relates to the technical field of air conditioners, aims to solve the problem that the simulation analysis of vibration noise of a compressor piping is inaccurate due to the fact that the direction of an existing unbalanced force is difficult to determine, and provides a method and a device for determining the direction of the unbalanced force, wherein the scheme comprises the following steps: acquiring rotating speed fluctuation time domain data of a motor crankshaft of a compressor to be tested, and obtaining a time domain load of the compressor to be tested according to the rotating speed fluctuation time domain data; establishing a finite element model of the compressor to be tested, and setting the rigid and flexible properties of parts in the finite element model and the boundary conditions of the finite element model; loading the time domain load into a finite element model, setting a load step, and carrying out simulation calculation to obtain displacement data of the exhaust port of the compressor to be tested; and drawing a vibration displacement track diagram of the exhaust port according to the displacement data, and determining the direction of the unbalanced force according to the vibration displacement track diagram. The method can quickly determine the direction of the unbalanced force, and is suitable for the piping vibration simulation analysis of the rotor compressor.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for determining the direction of an unbalanced force.
Background
The compressor is the heart of the air conditioning system and is also the primary source of excitation for the air conditioner to generate vibration and noise. In the development of air-conditioning products, the problem of vibration noise of an air-conditioning pipeline is a difficult point and a pain point, and the problem of solving the problem through a simulation tool is a necessary means for various air-conditioning manufacturers. At present, the problems are solved in the industry by a frequency domain simulation method, namely harmonic analysis simulation, but in the simulation, the forward direction and the reverse direction of the rotating load have no influence on the simulation result, namely the simulation cannot simulate the influence of the rotating direction of the rotating shaft of the compressor on the piping response of the air conditioner. In the actual process, implementing standardization becomes an important measure for improving the efficiency of enterprises, and in order to solve the above problems, enterprises expect that the same set of air conditioner piping can be quickly matched with a plurality of compressors, and in the compressors, the rotation direction of the compressors is in a forward direction and a reverse direction.
Typically, the rotor compressor load includes two main types: the moment of inertia of rotation and the imbalance force are vectors. In simulation, the rotation direction of the compressor is mainly embodied by the amplitude and the direction of the two loads and the phase difference between the two loads, wherein the rotation inertia moment, the amplitude of the unbalanced force and the phase difference between the two loads can be calculated by professional calculation software, and the direction of the unbalanced force is difficult to determine, so that the simulation analysis of vibration noise of the compressor piping is inaccurate.
Disclosure of Invention
The invention aims to solve the problem that the simulation analysis of vibration noise of a compressor piping is inaccurate due to the fact that the direction of the existing unbalanced force is difficult to determine, and provides a method and a device for determining the direction of the unbalanced force.
The technical scheme adopted by the invention for solving the technical problems is as follows: method for determining the direction of an unbalance force for vibration simulation analysis of a rotary compressor, comprising the steps of:
step1, obtaining rotation speed fluctuation time domain data of a crankshaft of a motor of a compressor to be tested, and obtaining a time domain load of the compressor to be tested according to the rotation speed fluctuation time domain data;
step2, establishing a finite element model of the compressor to be tested, and setting the rigid and flexible properties of parts in the finite element model and the boundary conditions of the finite element model;
and 4, drawing a vibration displacement track graph of the exhaust port according to the displacement data, and determining the direction of the unbalanced force according to the vibration displacement track graph.
Further, the finite element model includes: the compressor comprises a compressor barrel and a liquid accumulator barrel, wherein the bottom of the compressor barrel is connected with a plurality of compressor brackets, each compressor bracket is connected with a shock pad, the top of the compressor barrel is provided with an exhaust port, the liquid accumulator barrel is connected with the compressor barrel through a connecting pipe, the liquid accumulator barrel is provided with a liquid accumulator hoop and a hoop bracket, and the top of the liquid accumulator barrel is provided with an air suction port;
the inside rotating assembly, motor stator and the cylinder subassembly that is equipped with of compressor barrel, rotating assembly includes: go up balancing piece, electric motor rotor, balancing piece, motor crankshaft and eccentric rotor down, the cylinder assembly includes: cylinder upper cover, amortization cover, cylinder and cylinder lower cover.
Further, the method for setting the rigidity and flexibility of the parts in the finite element model comprises the following steps: the compressor cylinder, the exhaust port, the air suction port, the liquid storage cylinder bracket, the liquid storage cylinder hoop, the liquid storage cylinder body, the connecting pipe, the shock pad and the compressor bracket are arranged into a flexible body, and the upper balance block, the motor rotor, the lower balance block, the motor crankshaft, the motor stator, the cylinder upper cover, the muffling cover, the cylinder and the cylinder lower cover are arranged into a rigid body.
Further, the boundary condition of the finite element model is that the bottom surfaces of all shock-absorbing cushions are fixed.
Further, the load steps include a first load step and a second load step, the duration of the first load step is equal to one period of the rotational speed fluctuation time domain data, the initial rotational speed of the first load step is zero, the stop rotational speed is equal to the rotational speed of the initial point in the rotational speed fluctuation time domain data, the rotational speed and the time in the first load step are changed linearly, the initial rotational speed of the second load step is equal to the stop rotational speed of the first load step, and the second load step is rotational speed fluctuation time domain data in a plurality of periods.
Further, the second load step is rotational speed fluctuation time domain data in at least ten cycles.
Further, the method for drawing the vibration displacement trajectory diagram of the exhaust port according to the displacement data comprises the following steps:
taking a straight line where the air suction port and the air exhaust port are located as an X axis, taking a straight line vertical to the X axis as a Y axis, and establishing a rectangular coordinate system by taking the initial position of the air exhaust port as an origin of coordinates;
and determining the displacement coordinates of the exhaust port in a rectangular coordinate system according to the displacement data, and drawing a vibration displacement trajectory diagram of the exhaust port according to the displacement coordinates.
Further, the method for determining the direction of the unbalanced force according to the vibration displacement trajectory diagram comprises the following steps:
and determining a track point with the maximum absolute value of the vertical coordinate in the vibration displacement track diagram, wherein the direction in which the origin of the rectangular coordinate system points to the point is the direction of the unbalanced force.
The invention also provides a device for determining the direction of the unbalanced force, which is used for the vibration simulation analysis of the rotor compressor and comprises the following components:
the acquisition unit is used for acquiring the rotating speed fluctuation time domain data of the crankshaft of the motor of the compressor to be detected and acquiring the time domain load of the compressor to be detected according to the rotating speed fluctuation time domain data;
the establishing unit is used for establishing a finite element model of the compressor to be tested and setting the rigidity and flexibility of parts in the finite element model and the boundary conditions of the finite element model;
the simulation unit is used for loading the time domain load into the finite element model, setting a load step and carrying out simulation calculation to obtain displacement data of the exhaust port of the compressor to be tested;
and the determining unit is used for drawing a vibration displacement track diagram of the exhaust port according to the displacement data and determining the direction of the unbalanced force according to the vibration displacement track diagram.
The invention has the beneficial effects that: according to the method and the device for determining the direction of the unbalanced force, the direction of the unbalanced force is quickly determined by simulating and analyzing the vibration displacement track of the exhaust port of the compressor, so that accurate load is provided for frequency domain simulation, the influence of compressors in different rotating directions on the response of the piping is avoided, and the accuracy of simulation analysis of vibration noise of the piping of the compressor is improved.
Drawings
Fig. 1 is a schematic flow chart illustrating a method for determining an imbalance force direction according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a finite element model according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of the interior of a compressor barrel according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a rotating assembly according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of a cylinder assembly according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of time-domain data of rotational speed fluctuation and load setting steps according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a rectangular coordinate system according to an embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating displacement traces of the discharge port when the compressor according to the embodiment of the present invention rotates counterclockwise;
FIG. 9 is a schematic diagram illustrating displacement traces of the discharge port when the compressor rotates clockwise according to the embodiment of the present invention;
fig. 10 is a schematic structural diagram of an unbalanced force direction determination apparatus according to an embodiment of the present invention;
description of reference numerals:
1-a compressor cylinder; 2-an exhaust port; 3-air suction port; 4-reservoir holder; 5-a liquid storage device hoop; 6-reservoir cylinder; 7-connecting pipe; 8-a shock pad; 9-compressor bracket; 10-a rotating assembly; 10 a-an upper balance weight; 10 b-a motor rotor; 10 c-lower balance weight; 10 d-motor crankshaft; 10 e-an eccentric rotor; 11-a motor stator; 12-a cylinder assembly; 12 a-cylinder upper cover; 12 b-a sound deadening hood; 12 c-a cylinder; 12 d-cylinder lower cover; step1 — first load Step; step2 — second load Step.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The invention aims to solve the problem that the simulation analysis of vibration noise of a compressor piping is inaccurate due to the fact that the direction of the existing unbalanced force is difficult to determine, and provides a method and a device for determining the direction of the unbalanced force, wherein the technical scheme is summarized as follows: acquiring rotating speed fluctuation time domain data of a motor crankshaft of a compressor to be tested, and obtaining a time domain load of the compressor to be tested according to the rotating speed fluctuation time domain data; establishing a finite element model of the compressor to be tested, and setting the rigid and flexible properties of parts in the finite element model and the boundary conditions of the finite element model; loading the time domain load into a finite element model, setting a load step, and carrying out simulation calculation to obtain displacement data of the exhaust port of the compressor to be tested; and drawing a vibration displacement track diagram of the exhaust port according to the displacement data, and determining the direction of the unbalanced force according to the vibration displacement track diagram.
Firstly, calculating rotation speed fluctuation time domain data of a motor crankshaft of a compressor to be measured through professional calculation software, wherein the rotation speed fluctuation time domain data is used for representing the corresponding relation between the rotation speed of the motor crankshaft and time, and generating a time domain load for simulation analysis according to the rotation speed fluctuation time domain data, and the time domain load is used for representing the corresponding relation between the load and the time; then, establishing an accurate compressor finite element model according to real model data of the compressor to be tested, setting the rigid-flexible property of each part in the finite element model and applying boundary conditions to the finite element model, then loading time-domain loads into the finite element model according to the load steps, and carrying out simulation calculation to obtain displacement data of an exhaust port of the compressor to be tested, wherein the displacement data of the exhaust port is used for representing the amplitude and the direction of the exhaust port of the compressor deviating from the initial position; and finally, drawing a displacement track diagram of the exhaust port according to the displacement data of the exhaust port, and determining the direction of the unbalanced force according to the displacement track diagram.
Examples
The method for determining the direction of the unbalanced force according to the embodiment of the present invention, where the direction of the unbalanced force is used for vibration simulation analysis of a rotor compressor, as shown in fig. 1, includes the following steps:
step S1, obtaining rotation speed fluctuation time domain data of a crankshaft of a motor of the compressor to be tested, and obtaining time domain load of the compressor to be tested according to the rotation speed fluctuation time domain data;
it can be understood that the time domain load of the compressor to be measured is calculated according to the rotation speed fluctuation time domain data of the motor crankshaft, the input period of the rotation speed fluctuation time domain data is related to the operation frequency of the motor crankshaft, because the time domain vibration data is formed by overlapping transient response results and steady state response results, the transient response gradually attenuates along with the increase of time, therefore, when the compressor operates at low frequency, the frequency is low, the period is large, the transient response attenuates, and vice versa. The related calculation method belongs to the prior art, and is not described herein again.
Step S2, establishing a finite element model of the compressor to be tested, and setting the rigid and flexible properties of parts in the finite element model and the boundary conditions of the finite element model;
as shown in fig. 2, the finite element model of the present embodiment includes: the compressor comprises a compressor barrel 1 and a liquid storage device barrel 6, wherein the bottom of the compressor barrel 1 is connected with a plurality of compressor brackets 9, each compressor bracket 9 is connected with a shock pad 8, the top of the compressor barrel 1 is provided with an exhaust port 2, the liquid storage device barrel 6 is connected with the compressor barrel 1 through a connecting pipe 7, a liquid storage device hoop 5 and a hoop support 4 are arranged on the liquid storage device barrel 6, and the top of the liquid storage device barrel 1 is provided with an air suction port 3; as shown in fig. 3, a rotating assembly 10, a motor stator 11 and a cylinder assembly 12 are arranged inside the compressor cylinder 1; as shown in fig. 4, the rotating assembly 10 includes: an upper balance weight 10a, a motor rotor 10b, a lower balance weight 10c, a motor crankshaft 10d and an eccentric rotor 10 e; as shown in fig. 5, the cylinder assembly 12 includes: a cylinder upper cover 12a, a muffler cover 12b, a cylinder 12c, and a cylinder lower cover 12 d.
In this embodiment, the method for setting the rigid-flexible property of the component in the finite element model includes: the compressor cylinder 1, the exhaust port 2, the air suction port 3, the liquid storage cylinder bracket 4, the liquid storage cylinder hoop 5, the liquid storage cylinder body 6, the connecting pipe 7, the shock absorption pad 8 and the compressor bracket 9 are arranged into a flexible body, and the upper balance block 10a, the motor rotor 10b, the lower balance block 10c, the motor crankshaft 10d, the eccentric rotor 10e, the motor stator 11, the cylinder upper cover 12a, the muffling cover 12b, the cylinder 12c and the cylinder lower cover 12d are arranged into a rigid body. The boundary condition of the finite element model is that the bottom surfaces of all shock-absorbing cushions 8 are fixed. Through the finite element model, displacement data of the exhaust port of the compressor can be accurately analyzed.
S3, loading the time domain load into a finite element model, setting a load step, and carrying out simulation calculation to obtain displacement data of the exhaust port of the compressor to be tested;
it can be understood that, in this embodiment, the load steps include a first load step and a second load step, the duration of the first load step is equal to one period of the time domain data of the rotation speed fluctuation, the initial rotation speed of the first load step is zero, the stop rotation speed is equal to the rotation speed of the initial point in the time domain data of the rotation speed fluctuation, the rotation speed in the first load step varies linearly with time, the initial rotation speed of the second load step is equal to the stop rotation speed of the first load step, and the second load step is the time domain data of the rotation speed fluctuation in a plurality of periods.
For convenience of calculation and accuracy of simulation analysis, in this embodiment, the second load step is time domain data of rotation speed fluctuation in at least ten cycles.
As shown in FIG. 6, the time domain data of the rotation speed fluctuation of the crankshaft of the compressor motor at 30Hz is obtained by the professional calculation software, the time domain data of the rotation speed fluctuation of 10 periods is selected, and the rotation speed of the first point in the data is 150 rad/s. The number of the simulation load steps is set to be 2, the first load step1 is set to have the cutoff time of 0.0333s, the second load step2 is set to have the cutoff time of 0.3666s, and the rotating speed values in the (0.0333, 0.3666) interval are in one-to-one correspondence with the rotating speed values in the 10 periods.
And step S4, drawing a vibration displacement track diagram of the exhaust port according to the displacement data, and determining the direction of the unbalanced force according to the vibration displacement track diagram.
In this embodiment, the vibration displacement trace diagram of the exhaust port is shown in the rectangular coordinate system. The method for drawing the vibration displacement track graph of the exhaust port according to the displacement data comprises the following steps:
taking a straight line where the air suction port and the air exhaust port are located as an X axis, taking a straight line vertical to the X axis as a Y axis, and establishing a rectangular coordinate system by taking the initial position of the air exhaust port as an origin of coordinates;
and determining the displacement coordinates of the exhaust port in a rectangular coordinate system according to the displacement data, and drawing a vibration displacement trajectory diagram of the exhaust port according to the displacement coordinates.
Specifically, as shown in fig. 7, a direction in which the compressor suction port 3 is directed toward the exhaust port 2 is an X-axis direction, a direction perpendicular to the X-axis direction is a Y-axis direction, a rectangular coordinate system is established with an initial position of the exhaust port 2 as an origin of coordinates, and a displacement trajectory diagram of the exhaust port 2 is drawn in the rectangular coordinate system based on displacement data of the exhaust port.
In this embodiment, the method for determining the direction of the unbalanced force according to the vibration displacement trajectory diagram includes:
and determining a track point with the maximum absolute value of the vertical coordinate in the vibration displacement track diagram, wherein the direction in which the origin of the rectangular coordinate system points to the point is the direction of the unbalanced force.
Fig. 8 shows a displacement trace diagram of the exhaust port when the compressor rotates counterclockwise, and fig. 9 shows a displacement trace diagram of the exhaust port when the compressor rotates clockwise, it can be seen that when the rotation directions of the compressor motors are different, the corresponding displacement traces of the exhaust port are also different, and accordingly, the directions of the unbalanced forces can be determined according to the differences. Specifically, in fig. 8 and 9, the locus point with the largest absolute value of the ordinate is P, and the directions of the unbalanced forces are from the origin of coordinates O to P.
Based on the above technical solution, this embodiment further provides an apparatus for determining an unbalanced force direction, where the unbalanced force direction is used for vibration simulation analysis of a rotor type compressor, as shown in fig. 10, and the apparatus includes:
the acquisition unit is used for acquiring the rotating speed fluctuation time domain data of the crankshaft of the motor of the compressor to be detected and acquiring the time domain load of the compressor to be detected according to the rotating speed fluctuation time domain data;
the establishing unit is used for establishing a finite element model of the compressor to be tested and setting the rigidity and flexibility of parts in the finite element model and the boundary conditions of the finite element model;
the simulation unit is used for loading the time domain load into the finite element model, setting a load step and carrying out simulation calculation to obtain displacement data of the exhaust port of the compressor to be tested;
and the determining unit is used for drawing a vibration displacement track diagram of the exhaust port according to the displacement data and determining the direction of the unbalanced force according to the vibration displacement track diagram.
It can be understood that, the device for determining the direction of the unbalanced force according to the embodiment of the present invention is a device for implementing the method for determining the direction of the unbalanced force according to the embodiment, and for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is simpler, and for the relevant points, reference may be made to the partial description of the method.
Claims (6)
1. Method for determining the direction of an unbalance force for vibration simulation analysis of a rotary compressor, characterized in that it comprises the following steps:
step1, obtaining rotation speed fluctuation time domain data of a crankshaft of a motor of a compressor to be tested, and obtaining a time domain load of the compressor to be tested according to the rotation speed fluctuation time domain data;
step2, establishing a finite element model of the compressor to be tested, and setting the rigid and flexible properties of parts in the finite element model and the boundary conditions of the finite element model;
step 3, loading the time domain load into a finite element model, setting a load step, and carrying out simulation calculation to obtain displacement data of the exhaust port of the compressor to be tested;
step 4, drawing a vibration displacement track diagram of the exhaust port according to the displacement data, and determining the direction of the unbalanced force according to the vibration displacement track diagram;
the finite element model includes: the compressor comprises a compressor barrel and a liquid accumulator barrel, wherein the bottom of the compressor barrel is connected with a plurality of compressor brackets, each compressor bracket is connected with a shock pad, the top of the compressor barrel is provided with an exhaust port, the liquid accumulator barrel is connected with the compressor barrel through a connecting pipe, the liquid accumulator barrel is provided with a liquid accumulator hoop and a hoop bracket, and the top of the liquid accumulator barrel is provided with an air suction port;
the inside rotating assembly, motor stator and the cylinder subassembly that is equipped with of compressor barrel, rotating assembly includes: go up balancing piece, electric motor rotor, balancing piece, motor crankshaft and eccentric rotor down, the cylinder assembly includes: the silencing device comprises an upper cylinder cover, a silencing cover, a cylinder and a lower cylinder cover;
the method for setting the rigid and flexible properties of the parts in the finite element model comprises the following steps: the compressor cylinder, the exhaust port, the air suction port, the liquid storage cylinder bracket, the liquid storage cylinder hoop, the liquid storage cylinder body, the connecting pipe, the shock pad and the compressor bracket are arranged into a flexible body, and the upper balance block, the motor rotor, the lower balance block, the motor crankshaft, the motor stator, the cylinder upper cover, the muffling cover, the cylinder and the cylinder lower cover are arranged into a rigid body;
the boundary condition of the finite element model is that the bottom surfaces of all shock pads are fixed.
2. The method for determining a direction of an imbalance force according to claim 1, wherein the load steps include a first load step and a second load step, the duration of the first load step is equal to one cycle of the time domain data of the rotational speed fluctuation, the initial rotational speed of the first load step is zero, the cut-off rotational speed is equal to the rotational speed of the initial point in the time domain data of the rotational speed fluctuation, the rotational speed in the first load step varies linearly with time, the initial rotational speed of the second load step is equal to the cut-off rotational speed of the first load step, and the second load step is the time domain data of the rotational speed fluctuation in a plurality of cycles.
3. The method of determining a direction of an imbalance force of claim 2, wherein the second load step is time domain data of rotational speed fluctuations over at least ten cycles.
4. The method of determining a direction of an imbalance force according to claim 1, wherein the step of plotting a graph of the vibrational displacement trajectory of the exhaust port from the displacement data comprises:
taking a straight line where the air suction port and the air exhaust port are located as an X axis, taking a straight line vertical to the X axis as a Y axis, and establishing a rectangular coordinate system by taking the initial position of the air exhaust port as an origin of coordinates;
and determining the displacement coordinates of the exhaust port in a rectangular coordinate system according to the displacement data, and drawing a vibration displacement trajectory diagram of the exhaust port according to the displacement coordinates.
5. The method of determining a direction of an imbalance force according to claim 4, wherein determining a direction of an imbalance force from the vibrational displacement trace comprises:
and determining a track point with the maximum absolute value of the vertical coordinate in the vibration displacement track diagram, wherein the direction in which the origin of the rectangular coordinate system points to the point is the direction of the unbalanced force.
6. Device for determining the direction of an unbalance force for vibration simulation analysis in a rotary compressor, comprising:
the acquisition unit is used for acquiring the rotating speed fluctuation time domain data of the crankshaft of the motor of the compressor to be detected and acquiring the time domain load of the compressor to be detected according to the rotating speed fluctuation time domain data;
the establishing unit is used for establishing a finite element model of the compressor to be tested and setting the rigidity and flexibility of parts in the finite element model and the boundary conditions of the finite element model;
the simulation unit is used for loading the time domain load into the finite element model, setting a load step and carrying out simulation calculation to obtain displacement data of the exhaust port of the compressor to be tested;
the determining unit is used for drawing a vibration displacement track diagram of the exhaust port according to the displacement data and determining the direction of the unbalanced force according to the vibration displacement track diagram;
the finite element model includes: the compressor comprises a compressor barrel and a liquid accumulator barrel, wherein the bottom of the compressor barrel is connected with a plurality of compressor brackets, each compressor bracket is connected with a shock pad, the top of the compressor barrel is provided with an exhaust port, the liquid accumulator barrel is connected with the compressor barrel through a connecting pipe, the liquid accumulator barrel is provided with a liquid accumulator hoop and a hoop bracket, and the top of the liquid accumulator barrel is provided with an air suction port;
the inside rotating assembly, motor stator and the cylinder subassembly that is equipped with of compressor barrel, rotating assembly includes: go up balancing piece, electric motor rotor, balancing piece, motor crankshaft and eccentric rotor down, the cylinder assembly includes: the silencing device comprises an upper cylinder cover, a silencing cover, a cylinder and a lower cylinder cover;
the method for setting the rigid and flexible properties of the parts in the finite element model comprises the following steps: the compressor cylinder, the exhaust port, the air suction port, the liquid storage cylinder bracket, the liquid storage cylinder hoop, the liquid storage cylinder body, the connecting pipe, the shock pad and the compressor bracket are arranged into a flexible body, and the upper balance block, the motor rotor, the lower balance block, the motor crankshaft, the motor stator, the cylinder upper cover, the muffling cover, the cylinder and the cylinder lower cover are arranged into a rigid body;
the boundary condition of the finite element model is that the bottom surfaces of all shock pads are fixed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110517709.9A CN113191057B (en) | 2021-05-12 | 2021-05-12 | Method and device for determining direction of unbalanced force |
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| CN202110517709.9A CN113191057B (en) | 2021-05-12 | 2021-05-12 | Method and device for determining direction of unbalanced force |
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| CN106326558A (en) * | 2016-08-24 | 2017-01-11 | 青岛腾远设计事务所有限公司 | Modeling and calculating method for stress of special-shaped grid structure |
| CN108021747A (en) * | 2017-11-30 | 2018-05-11 | 西南交通大学 | The emulation mode that a kind of high ferro bow net dynamic behaviour dynamic mesh out-of-balance force eliminates |
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