CN103793554A - Air compressor frame structure evaluation method - Google Patents
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Abstract
The invention aims at providing an air compressor frame structure evaluation method. The evaluation method includes the steps: performing finite element analysis on an air compression frame model under different working conditions; utilizing an electric test to verify finite element analysis results; comprehensively evaluating an air compressor frame structure by combining the finite element analysis results with electric test results. By the evaluation method, the defects that finalizing can be realized only through a lot of tests, and development is high in cost and long in cycle in existing air compressor frame structure design are overcome. The air compressor frame structure evaluation method has the advantages of simple step, low time consumption and high reliability, and a theoretical basis is provided for optimized design of an air compressor frame.
Description
Technical field
The present invention relates to body frame structure for automotive and detect evaluation areas, be specifically related to a kind of air compressor machine body frame structure for automotive appraisal procedure.
Background technology
The portable air compressor market of China will account for more 1/3 the market share of whole compressor market, and as an emerging market, the market space of portable air compressor is relatively larger, and profit is higher.Portable air compressor market is mainly occupied by Taiwan investment and foreign capital affiliate at present, and the air compressor machine of independent research is less on the market.Vehicle frame is the main bearing part of portable air compressor, at present domestic to the design of this type of vehicle frame still in the Experience Design stage, the problems such as the destruction to vehicle frame that the stressing conditions during to its air compressor machine work causes are not also carried out quantitative research, cause the very easily recurring structure fracture of initial development stage of product, need to can shape by a large amount of tests, cost of development is high, and the cycle is long.
Summary of the invention
The present invention aims to provide a kind of air compressor machine body frame structure for automotive appraisal procedure, this appraisal procedure overcomes in existing air compressor machine body frame structure for automotive design to be needed can shape by a large amount of tests, cost of development is high, and the defect that the cycle is long, for the optimal design of air compressor machine vehicle frame provides accurate theoretical foundation.
Technical solution of the present invention is as follows: a kind of air compressor machine body frame structure for automotive appraisal procedure, comprises the following steps:
A, set up air compressor machine vehicle frame finite element model, and set material properties, load, constraint condition;
B, finite element model is carried out to finite element analysis under deadweight vertical lifting operating mode, fore-and-aft tilt lifting operating mode, transverse pitch lifting operating mode, obtain corresponding operating mode stress cloud atlas;
The region in the region of C, each stress cloud atlas upper stress maximum is made as electrical measurement region, select to be easy to actual operating mode of carrying out in deadweight vertical lifting operating mode, fore-and-aft tilt lifting operating mode, transverse pitch lifting operating mode, electrical testing inspection is carried out in electrical measurement region on air compressor machine vehicle frame entity;
D, electrical testing inspection result and finite element analysis result are contrasted, the error range of assessment finite element analysis result and actual test, if error in allowed band, finite element model and appraisal procedure are successfully established, and carry out comprehensive assessment; If error exceeds allowed band, return to steps A and re-start.
Described deadweight vertical lifting operating mode, comprises the deadweight vertical lifting operating mode that lifting acceleration is 1g, the deadweight vertical lifting operating mode that lifting acceleration is 2g, the deadweight vertical lifting operating mode that lifting acceleration is 4g;
Described fore-and-aft tilt lifting operating mode, comprises that lifting acceleration is 1.5g, fore-and-aft tilt+15
0lifting operating mode, lifting acceleration is 1.5g, fore-and-aft tilt-15
0lifting operating mode;
Described transverse pitch lifting operating mode, comprises that lifting acceleration is 1.5g, transverse pitch+15
0lifting operating mode, lifting acceleration is 1.5g, transverse pitch-15
0lifting operating mode.
Finite element analysis type under the described deadweight vertical lifting operating mode that is 4g to lifting acceleration is static nonlinear analysis.
In described deadweight vertical lifting Work condition analogue process, upending frame top in air compressor machine vehicle frame finite element model retrains whole degree of freedom, obtain displacement and the stress situation of each key position under each deadweight vertical lifting operating mode by finite element analysis, calculate vehicle frame maximum stress under this operating mode, find out the region that stress is larger.
In described fore-and-aft tilt lifting Work condition analogue process, upending frame top in air compressor machine vehicle frame finite element model retrains whole degree of freedom, obtain displacement and the stress situation of each key position under each fore-and-aft tilt lifting operating mode by finite element analysis, calculate vehicle frame maximum stress under this operating mode, find out the region that stress is larger.
In described transverse pitch lifting Work condition analogue process, upending frame top in air compressor machine vehicle frame finite element model retrains whole degree of freedom, obtain displacement and the stress situation of each key position under each fore-and-aft tilt lifting operating mode by finite element analysis, calculate vehicle frame maximum stress under this operating mode, find out the region that stress is larger.
In described step D, after finite element model and appraisal procedure are successfully established, carry out comprehensive assessment and refer to the stress area that has occurred exceeding yield strength in finite element analysis, prove that air compressor machine body frame structure for automotive does not meet to conform to quality requirements, otherwise prove that air compressor machine body frame structure for automotive conforms to quality requirements.
Air compressor machine body frame structure for automotive appraisal procedure of the present invention is carried out finite element analysis to air compressor machine vehicle frame, the special operation condition while lifting in conjunction with air compressor machine vehicle frame, and wherein 1g deadweight vertical lifting operating mode, 2g conduct oneself with dignity under vertical lifting operating mode, air compressor machine vehicle frame generation elastic deformation; And under 4g deadweight vertical lifting operating mode, the stressed yield limit that has even exceeded very greatly material of local location, i.e. air compressor machine vehicle frame generation plastic deformation, so vehicle frame is carried out to material nonlinearity static analysis, more laminating is actual; 1.5g fore-and-aft tilt+15
0lifting operating mode, 1.5g fore-and-aft tilt-15
0lifting operating mode, 1.5g transverse pitch+15
0lifting operating mode, 1.5g transverse pitch-15
0the operating mode of waving when lifting operating mode is lifted by crane for air compressor machine vehicle frame; The operating mode that above operating mode may occur while having covered the lifting of air compressor machine vehicle frame, has guaranteed the comprehensive of analysis result.By the finite element analysis to air compressor machine vehicle frame under above-mentioned operating mode, obtain the stress cloud atlas under each operating mode, and the region that in counter stress cloud atlas, stress is larger carries out electrical testing inspection checking, the combination of finite element analysis and electrical testing inspection has strengthened the accuracy of assessment result with scientific.
In sum, air compressor machine body frame structure for automotive appraisal procedure is carried out combination by finite element analysis and electrical testing inspection, complete the structural appraisal of air compressor machine vehicle frame, there is simple, consuming time short, the feature that reliability is strong of step, for the optimal design of air compressor machine vehicle frame provides accurate theoretical foundation.
Accompanying drawing explanation
Fig. 1 is air compressor machine body frame structure for automotive appraisal procedure process flow diagram of the present invention.
Embodiment
Further illustrate the present invention below in conjunction with embodiment.
Embodiment 1
The present embodiment air compressor machine body frame structure for automotive appraisal procedure step is as follows:
A, set up air compressor machine vehicle frame finite element model, and set material properties, load, constraint condition;
B, finite element model is carried out to finite element analysis under deadweight vertical lifting operating mode, fore-and-aft tilt lifting operating mode, transverse pitch lifting operating mode, obtain corresponding operating mode stress cloud atlas;
The region in the region of C, each stress cloud atlas upper stress maximum is made as electrical measurement region, select to be easy to actual operating mode of carrying out in deadweight vertical lifting operating mode, fore-and-aft tilt lifting operating mode, transverse pitch lifting operating mode, electrical testing inspection is carried out in electrical measurement region on air compressor machine vehicle frame entity;
D, electrical testing inspection result and finite element analysis result are contrasted, the error range of assessment finite element analysis result and actual test, if error in allowed band, finite element model and appraisal procedure are successfully established, and carry out comprehensive assessment; If error exceeds allowed band, return to steps A and re-start;
Described deadweight vertical lifting operating mode, comprises the deadweight vertical lifting operating mode that lifting acceleration is 1g, the deadweight vertical lifting operating mode that lifting acceleration is 2g, the deadweight vertical lifting operating mode that lifting acceleration is 4g;
Described fore-and-aft tilt lifting operating mode, comprises that lifting acceleration is 1.5g, fore-and-aft tilt+15
0lifting operating mode, lifting acceleration is 1.5g, fore-and-aft tilt-15
0lifting operating mode;
Described transverse pitch lifting operating mode, comprises that lifting acceleration is 1.5g, transverse pitch+15
0lifting operating mode, lifting acceleration is 1.5g, transverse pitch-15
0lifting operating mode;
Finite element analysis type under the described deadweight vertical lifting operating mode that is 4g to lifting acceleration is static nonlinear analysis;
In described deadweight vertical lifting Work condition analogue process, upending frame top in air compressor machine vehicle frame finite element model retrains whole degree of freedom, obtain displacement and the stress situation of each key position under each deadweight vertical lifting operating mode by finite element analysis, calculate vehicle frame maximum stress under this operating mode, find out the region that stress is larger;
In described fore-and-aft tilt lifting Work condition analogue process, upending frame top in air compressor machine vehicle frame finite element model retrains whole degree of freedom, obtain displacement and the stress situation of each key position under each fore-and-aft tilt lifting operating mode by finite element analysis, calculate vehicle frame maximum stress under this operating mode, find out the region that stress is larger;
In described transverse pitch lifting Work condition analogue process, upending frame top in air compressor machine vehicle frame finite element model retrains whole degree of freedom, obtain displacement and the stress situation of each key position under each fore-and-aft tilt lifting operating mode by finite element analysis, calculate vehicle frame maximum stress under this operating mode, find out the region that stress is larger;
In described step D, after finite element model and appraisal procedure are successfully established, carry out comprehensive assessment and refer to the stress area that has occurred exceeding or approaching yield strength in finite element analysis, prove that air compressor machine body frame structure for automotive does not meet quality requirements, otherwise prove that air compressor machine body frame structure for automotive conforms to quality requirements.
Illustrate the air compressor machine body frame structure for automotive appraisal procedure in deadweight vertical lifting operating mode, fore-and-aft tilt lifting operating mode below:
One, 1g deadweight vertical lifting operating mode:
1, in Hypermesh, import the air compressor machine vehicle frame model kyjcj.stp presetting;
2, grid division: sizing grid is 5mm; And mesh quality is checked;
3, vehicle frame model being simulated to welding is connected with bolt;
4, material properties is set: wherein upending frame adopts tubular structure, and material therefor is No. 20 steel, and the yield stress under its factory state is 220Mpa, and minimum tensile strength is 360Mpa, elastic modulus 2.1 × 10
5mpa, Poisson ratio is 0.3, density is 7.8g/cm
3; Chassis and towbar are stamping steel plate weldments, and material therefor is Q235-B, and the yield stress under its factory state is 355MPa, and minimum tensile strength is 455Mpa, elastic modulus 2.1 × 10
5mpa, Poisson ratio is 0.3, density is 7.8g/cm
3;
5, air compressor machine frame materials is set: in materials, define material, called after M1, wherein type selects ISOTROPIC,, Card image selects MAT1, under editing, inputs parameters value, and E is that 2.1e+5, NU are 0.3, RHO is 7.8e-9.
6, set up set of properties: in properties, type selects 2D, and card image selects PSHELL, materials selects the material M1 building, and inputs the one-tenth-value thickness 1/10 of vehicle frame, for each parts on air compressor machine vehicle frame are selected corresponding one-tenth-value thickness 1/10 in the T under in editor;
7, model correction: in tool, application faces and normals check finite element model whether exist repetition face and normal whether consistent, the inconsistent situation occurring is revised;
8, applying boundary condition and load distributes
Lifting place is set to retrain 6 degree of freedom, called after con1 to vehicle frame to be chosen in constrains in Analysis;
The part that utilizes rigids to install in restricted model in 1D, as engine, refrigeratory, fuel tank etc.; And apply mass on the RBE2 establishing, and each part quality is added in the masses in 1D to called after mass1;
Its 1g acceleration of gravity is vertically downward set in load collectors; Card image selects GRAV, edits its numerical value and is respectively, G=9800, N1=0, N2=0, N3=-1, called after G1;
Loadsteps in Analysis sets up design condition, and type selects linear static, and SPC selects the con1 building, and LOAD selects G1, called after dis-1;
9, finite element analysis: the finite element model that utilizes above-mentioned steps to set up, in NX-NASTRAN, use " SESTATIC 101-multiple constraint " linear solution device to carry out finite element analysis computation, obtain stress cloud atlas;
10, in stress cloud atlas, be made as electrical measurement region compared with high-stress area territory, the electrical measurement region of air compressor machine vehicle frame entity is carried out sticking foil gauge after pre-service, foil gauge is connected with DH3816 static strain testing system;
11, the air compressor machine vehicle frame entity after paster is carried out to hoisting test, lifting operating mode is 1g deadweight vertical lifting operating mode, and balanced sample while landing, tests and record electrical testing inspection data after lifting;
12, electrical testing inspection data are contrasted with the stress value in corresponding electrical measurement region in stress cloud atlas, the two error is positioned at error range, and in stress cloud atlas, there is not exceeding the stress area of yield strength, therefore can judge that this air compressor machine vehicle frame meets the quality requirements under this operating mode.
Two, 4g deadweight vertical lifting operating mode static nonlinear analysis:
1, in Hypermesh, import the air compressor machine vehicle frame model kyjcj.stp presetting;
2, grid division: sizing grid is 5mm; And mesh quality is checked;
3, vehicle frame model is simulated welding and is connected;
4, material properties is set: wherein upending frame adopts tubular structure, and material therefor is No. 20 steel, and the yield stress under its factory state is 220Mpa, and minimum tensile strength is 360Mpa, elastic modulus 2.1 × 10
5mpa, Poisson ratio is 0.3, density is 7.8g/cm
3; This vehicle frame is metal construction weldment, and material therefor is Q235-B, and the yield stress under its factory state is 355MPa, and minimum tensile strength is 455Mpa, elastic modulus 2.1 × 10
5mpa, Poisson ratio is 0.3, density is 7.8g/cm
3;
5, air compressor machine frame materials is set: in materials, define material, called after M1, wherein type selects ISOTROPIC, card image selects MAT1, under editor, input parameters value, E is that 2.1e+5, NU are 0.3, RHO is 7.8e-9, and in MATS1, it is 220Mpa that type selects PLASTIC, LIMIT1 numerical value;
6, set up set of properties: in properties, type selects 2D, and card image selects PSHELL, materials selects the material M1 building, and inputs the one-tenth-value thickness 1/10 of vehicle frame, for each parts on air compressor machine vehicle frame are selected corresponding one-tenth-value thickness 1/10 in the T under in editor;
7, model correction: in tool, application faces and normals check finite element model whether exist repetition face and normal whether consistent, the inconsistent situation occurring is revised;
8, applying boundary condition and load distributes
Lifting place is set to retrain 6 degree of freedom, called after con1 to vehicle frame to be chosen in constrains in Analysis;
The part that utilizes rigids to install in restricted model in 1D, as engine, refrigeratory, fuel tank etc.; And apply mass on the RBE2 establishing, and each part quality is added in the masses in 1D to called after mass1;
Its 4g acceleration of gravity is vertically downward set in load collectors; Card image selects GRAV, edits its numerical value and is respectively, G=39200, N1=0, N2=0, N3=-1, called after G4;
Loadsteps in Analysis sets up design condition, and type selects nonlinear static, and SPC selects the con1 building, and LOAD selects G4, called after dis-1;
9, finite element analysis: the finite element model that utilizes above-mentioned steps to set up, in NX-NASTRAN, use " NLSTATIC 106 " nonlinear solver to carry out finite element analysis computation, obtain stress cloud atlas;
10, in stress cloud atlas, be made as electrical measurement region compared with high-stress area territory, the electrical measurement region of air compressor machine vehicle frame entity is carried out sticking foil gauge after pre-service, foil gauge is connected with DH3816 static strain testing system;
11, the air compressor machine vehicle frame entity after paster is carried out to hoisting test, lifting operating mode is 1g deadweight vertical lifting operating mode, balanced sample while landing, after lifting, test and record electrical testing inspection data, electrical testing inspection data are multiplied by 4, estimate the electrical testing inspection data that obtain under 4g deadweight vertical lifting operating mode;
12, the latter's electrical testing inspection data are contrasted with the stress value in corresponding electrical measurement region in stress cloud atlas, the two error is positioned at error range, and in stress cloud atlas, there is not exceeding the stress area of yield strength, therefore can judge that this air compressor machine vehicle frame meets the quality requirements under this operating mode.
Three, 1.5g fore-and-aft tilt-15
0lifting operating mode, gravity apply position the direction of overall coordinate axis with-Z axis angle is 15
0, with-Y-axis angle 75
0:
1, in Hypermesh, import the air compressor machine vehicle frame model kyjcj.stp presetting;
2, grid division: sizing grid is 5mm; And mesh quality is checked;
3, vehicle frame model is simulated welding and is connected;
4, material properties is set: wherein upending frame adopts tubular structure, and material therefor is No. 20 steel, and the yield stress under its factory state is 220Mpa, and minimum tensile strength is 360Mpa, elastic modulus 2.1 × 10
5mpa, Poisson ratio is 0.3, density is 7.8g/cm
3; This is stamping steel plate weldment with hitch frame, and material therefor is Q235-B, and the yield stress under its factory state is 355MPa, and minimum tensile strength is 455Mpa, elastic modulus 2.1 × 10
5mpa, Poisson ratio is 0.3, density is 7.8g/cm
3;
5, air compressor machine frame materials is set: in materials, define material, called after M1, wherein type selects ISOTROPIC, and card image selects MAT1, under editor, input parameters value, E is that 2.1e+5, G are that 8.1e+4, NU are 0.3, RHO is 7.8e-9;
6, set up set of properties: in properties, type selects 2D, and card image selects PSHELL, materials selects the material M1 building, and inputs the one-tenth-value thickness 1/10 of vehicle frame, for each parts on air compressor machine vehicle frame are selected corresponding one-tenth-value thickness 1/10 in the T under in editor;
7, model correction: in tool, application faces and normals check finite element model whether exist repetition face and normal whether consistent, the inconsistent situation occurring is revised;
8, applying boundary condition and load distributes
Lifting place is set to retrain 6 degree of freedom, called after con2 to vehicle frame to be chosen in constrains in Analysis;
The part that utilizes rigids to install in restricted model in 1D, as engine, refrigeratory, fuel tank etc.; And apply mass on the RBE2 establishing, and each part quality is added in the masses in 1D to called after mass1;
Its 1.5g acceleration of gravity is vertically downward set in load collectors; Card image selects GRAV, edits its numerical value and is respectively, G=14700, N1=0, N2=-0.260, N3=-0.966, called after G1.5g(-Y);
Loadsteps in Analysis sets up design condition, and type selects linear static, and SPC selects the con2 building, and LOAD selects G1.5g(-Y), called after dis-1.5g(-Y);
9, finite element analysis: the finite element model that utilizes above-mentioned steps to set up, in NX-NASTRAN, use " SESTATIC 101-multiple constraint " linear solution device to carry out finite element analysis computation, obtain stress cloud atlas;
10, in stress cloud atlas, be made as electrical measurement region compared with high-stress area territory, the electrical measurement region of air compressor machine vehicle frame entity is carried out sticking foil gauge after pre-service, foil gauge is connected with DH3816 static strain testing system;
11, the air compressor machine vehicle frame entity after paster is carried out to hoisting test, lifting operating mode is 1g fore-and-aft tilt-15
0lifting operating mode, balanced sample while landing, tests and records electrical testing inspection data after lifting, electrical testing inspection data are multiplied by 1.5, estimates and obtains 1.5g fore-and-aft tilt-15
0electrical testing inspection data under lifting operating mode;
12, the latter's electrical testing inspection data are contrasted with the stress value in corresponding electrical measurement region in stress cloud atlas, the two error is positioned at error range, and in stress cloud atlas, there is not exceeding the stress area of yield strength, therefore can judge that this air compressor machine vehicle frame meets the quality requirements under this operating mode.
Above embodiment is 3 kinds with Typical Representative in 7 kinds of operating modes of the present invention, and the appraisal procedure under other operating modes and said method step are similar, are only the variation in respective detailed parameters; Finally, consider 7 kinds of analysis and test results under operating mode, the air compressor machine body frame structure for automotive using in the present embodiment conforms to quality requirements.
Claims (7)
1. an air compressor machine body frame structure for automotive appraisal procedure, is characterized in that comprising the following steps:
A, set up air compressor machine vehicle frame finite element model, and set material properties, load, constraint condition;
B, finite element model is carried out to finite element analysis under deadweight vertical lifting operating mode, fore-and-aft tilt lifting operating mode, transverse pitch lifting operating mode, obtain corresponding operating mode stress cloud atlas;
C, the larger region of each stress cloud atlas upper stress are made as electrical measurement region, select to be easy to actual operating mode of carrying out in deadweight vertical lifting operating mode, fore-and-aft tilt lifting operating mode, transverse pitch lifting operating mode, and electrical testing inspection is carried out in electrical measurement region on air compressor machine vehicle frame entity;
D, electrical testing inspection result and finite element analysis result are contrasted, the error range of assessment finite element analysis result and actual test, if error in allowed band, finite element model and appraisal procedure are successfully established, and carry out comprehensive assessment; If error exceeds allowed band, return to steps A and re-start.
2. air compressor machine body frame structure for automotive appraisal procedure as claimed in claim 1, is characterized in that:
Described deadweight vertical lifting operating mode, comprises the deadweight vertical lifting operating mode that lifting acceleration is 1g, the deadweight vertical lifting operating mode that lifting acceleration is 2g, the deadweight vertical lifting operating mode that lifting acceleration is 4g;
Described fore-and-aft tilt lifting operating mode, comprises that lifting acceleration is 1.5g, fore-and-aft tilt+15
0lifting operating mode, lifting acceleration is 1.5g, fore-and-aft tilt-15
0lifting operating mode;
Described transverse pitch lifting operating mode, comprises that lifting acceleration is 1.5g, transverse pitch+15
0lifting operating mode, lifting acceleration is 1.5g, transverse pitch-15
0lifting operating mode.
3. air compressor machine body frame structure for automotive appraisal procedure as claimed in claim 2, is characterized in that:
Finite element analysis type under the described deadweight vertical lifting operating mode that is 4g to lifting acceleration is static nonlinear analysis.
4. air compressor machine body frame structure for automotive appraisal procedure as claimed in claim 2, it is characterized in that: in described deadweight vertical lifting Work condition analogue process, upending frame top in air compressor machine vehicle frame finite element model retrains whole degree of freedom, obtain displacement and the stress situation of each key position under each vertical lifting operating mode by finite element analysis, calculate vehicle frame maximum stress under this operating mode, find out the region that stress is larger.
5. air compressor machine body frame structure for automotive appraisal procedure as claimed in claim 2, it is characterized in that: in described fore-and-aft tilt lifting Work condition analogue process, upending frame top in air compressor machine vehicle frame finite element model retrains whole degree of freedom, obtain displacement and the stress situation of each key position under each fore-and-aft tilt lifting operating mode by finite element analysis, calculate vehicle frame maximum stress under this operating mode, find out the region that stress is larger.
6. air compressor machine body frame structure for automotive appraisal procedure as claimed in claim 2, it is characterized in that: in described transverse pitch lifting Work condition analogue process, upending frame top in air compressor machine vehicle frame finite element model retrains whole degree of freedom, obtain displacement and the stress situation of each key position under each fore-and-aft tilt lifting operating mode by finite element analysis, calculate vehicle frame maximum stress under this operating mode, find out the region that stress is larger.
7. air compressor machine body frame structure for automotive appraisal procedure as claimed in claim 1, it is characterized in that: in described step D, after finite element model and appraisal procedure are successfully established, carrying out comprehensive assessment refers to and in finite element analysis, has occurred that stress exceeds yield strength or stress value and approach the region of yield strength, prove that air compressor machine body frame structure for automotive does not meet quality requirements, otherwise prove that air compressor machine body frame structure for automotive conforms to quality requirements.
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| CN109867235A (en) * | 2019-02-19 | 2019-06-11 | 泉州装备制造研究所 | A kind of main passive control methods of forklift truck based on finite element |
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