CN112257318B - Method, system, equipment and storage medium for calculating strength of power cabinet of trolley with battery - Google Patents

Method, system, equipment and storage medium for calculating strength of power cabinet of trolley with battery Download PDF

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Publication number
CN112257318B
CN112257318B CN202011145432.3A CN202011145432A CN112257318B CN 112257318 B CN112257318 B CN 112257318B CN 202011145432 A CN202011145432 A CN 202011145432A CN 112257318 B CN112257318 B CN 112257318B
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power cabinet
trolley
battery
battery trolley
impact load
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CN112257318A (en
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黄学君
陈恒谦
吕阶军
莫文芳
熊玉玲
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CRRC Zhuzhou Locomotive Co Ltd
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CRRC Zhuzhou Locomotive Co Ltd
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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]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/15—Vehicle, aircraft or watercraft design
    • 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

Abstract

Compared with the traditional contact relation, the linear connection relation avoids the uncertainty of various parameter settings of the contact relation in a nonlinear calculation model, avoids the situation that the calculation result deviation is large and even the calculation result is not converged due to the uncertainty of the parameter settings, and enables the battery trolley wheels and the power cabinet rail beams to have the same vertical displacement or to synchronously deform along the vertical direction at the contact part by establishing the linear connection relation between the battery trolley wheels and the power cabinet rail beams, thereby being capable of obtaining the unique calculation result, greatly improving the calculation precision, simultaneously avoiding nonlinear factors and greatly improving the calculation speed.

Description

Method, system, equipment and storage medium for calculating strength of power cabinet of trolley with battery
Technical Field
The invention belongs to the technical field of power cabinet strength simulation calculation, and particularly relates to a method, a system, equipment and a storage medium for calculating the strength of a power cabinet of a trolley with a battery, which are suitable for installing a railway vehicle with the power cabinet of the trolley with the battery.
Background
Rail vehicles often need to carry a large number of batteries, which are arranged in several power supply cabinets, which cannot be too many, typically 1-2 power supply cabinets, due to the limited installation space of the equipment between the machines. These numerous individual storage batteries must therefore all be installed in a limited number of power cabinets.
The interior of the power cabinet is typically divided into a number of compartments from top to bottom, each of which is filled with a number of batteries. The power supply cabinet filled with the multi-layer storage battery is inconvenient to overhaul and maintain in the vehicle operation process due to the limitation of the space between the machines if the storage battery is completely fixedly arranged in the cabinet body. It is therefore common practice to arrange 1-2 battery carts per floor of the power cabinet, each battery cart being filled with a storage battery, the battery carts being mounted on rail beams per floor of the power cabinet. And in a normal working state, the fixing support of the battery trolley filled with the storage battery is locked on the battery trolley mounting seat of the power cabinet by using a bolt, so that the battery trolley is limited to move in the horizontal plane in the power cabinet. When the maintenance is stopped, the locking bolt of the battery trolley fixing support is firstly detached, the externally hung movable rail of the power cabinet is restored to the working position of the horizontal state, then the battery trolley is pulled out from the power cabinet to the externally hung movable rail of the power cabinet, and the battery trolley can be pulled out from the power cabinet, so that the storage battery and components can be conveniently replaced and maintained.
According to the design flow, intensity calculation is required to be carried out on the vehicle-mounted power supply cabinet according to relevant standards in the design stage, and the power supply cabinet is ensured to meet the intensity requirement in the operation process of the railway vehicle. When the rail vehicle runs, the power supply cabinet is in a dynamic working environment and can bear impact loads in different directions and sizes. Under the impact load, the contact relation between the wheels of the battery trolley and the rail beams of the power cabinet can be changed, for example, under the impact load in the vertical direction, the wheels of the battery trolley can further press the rail beams of the power cabinet, under the impact load in the transverse direction (the direction perpendicular to the rail in the horizontal plane) or the impact load in the longitudinal direction (the rail direction), part of the wheels of the battery trolley can further press the rail beams of the power cabinet, and the other part of the wheels can be separated from the rail beams of the power cabinet. When intensity calculation is generally performed on a power cabinet provided with a battery trolley, contact relation needs to be established between wheels of the battery trolley and a track beam of the power cabinet so as to realize force transmission. The contact relation is a connection relation commonly used among different components in finite element calculation, but the adoption of the contact relation has two obvious defects, namely, the contact relation is set by involving some parameter values and algorithm selection, and if the parameter values and algorithm are improperly selected, a great deviation can be generated on a calculation result, and even calculation misconvergence can occur. And secondly, the calculation model becomes a nonlinear model after the contact relation is set, so that the calculation time of the nonlinear model can be greatly prolonged, and the simulation calculation is not beneficial to timely and rapidly providing guidance and support services for the design.
Disclosure of Invention
The invention aims to provide a method, a system, equipment and a storage medium for calculating the strength of a power cabinet of a trolley with a battery, so as to solve the problems that the deviation of a calculation result is large, the calculation is possibly not converged, the calculation time is long and the like caused by different settings of the contact relation between wheels of the trolley and a track beam during the existing strength simulation calculation.
One or more of the above objects are solved by the solutions of the independent claims of the present invention.
The invention solves the technical problems by the following technical scheme: a calculation method for the strength of a power cabinet of a trolley with a battery comprises the following steps:
establishing a three-dimensional coordinate system, wherein the three-dimensional coordinate systemxThe axis represents the direction of travel of the vehicle,zthe axis represents a direction perpendicular to the ground and upwards,ythe shaft is determined according to the right hand rule;
establishing a geometric model of the power cabinet in the three-dimensional coordinate system according to the arrangement azimuth of the power cabinet on the vehicle;
establishing a geometric model of the battery trolley, placing the battery trolley into the power cabinet according to the assembly state of the battery trolley and the power cabinet during operation, and establishing a connecting bolt model between a battery trolley fixing support and a power cabinet mounting seat to obtain the geometric model of the power cabinet with the battery trolley;
performing gridding treatment on the geometric model of the power cabinet with the battery trolley, and enabling all nodes of the battery trolley wheels and the power cabinet track beam at the contact line of the battery trolley wheels and the power cabinet track beam to be overlapped;
restraining the translational degrees of freedom of the vertical, longitudinal and transverse directions of the power cabinet fixing support, and applying gravity acceleration to obtain an intensity calculation model of the power cabinet of the trolley with the battery;
determining working conditions for carrying out intensity calculation on the power supply cabinet according to the regulation of the impact load upper limit value of the vehicle-mounted equipment by the related standard of the railway vehicle, and respectively applying impact loads to the intensity calculation model under different working conditions;
judging whether contact relation exists between each wheel of the battery trolley and the track beam of the power cabinet under different working conditions;
determining whether connection relations between all wheels of the battery trolley and the power cabinet track beam are required to be established under different working conditions according to the judgment result of the contact relation, and if so, establishing connection relations between all wheels of the battery trolley and the power cabinet track beam under different working conditions;
and calculating the strength of the battery trolley power cabinet under each working condition.
In the invention, a linear connection relation is established between the battery trolley wheel and the power cabinet track beam, compared with the traditional contact relation, the linear connection relation avoids the uncertainty of various parameter settings of the contact relation in a nonlinear calculation model, avoids the conditions of large calculation result deviation and even non-convergence of the calculation result caused by the uncertainty of the parameter settings, and the calculation method ensures that the battery trolley wheel and the power cabinet track beam have the same vertical displacement or synchronously deform along the vertical direction at the contact part by establishing the linear connection relation between the battery trolley wheel and the power cabinet track beam, thereby obtaining a unique calculation result, greatly improving the calculation precision, simultaneously avoiding nonlinear factors and greatly improving the calculation speed.
Further, the specific operation process that each node of the battery trolley wheel and the power cabinet rail beam at the contact line is overlapped is as follows: the center line of the wheel axle of the trolley wheel is taken as a vertical plane, the vertical plane comprises a contact line between the trolley wheel and the rail beam of the power cabinet, the vertical plane forms a parting line on the outer surface of the trolley wheel and the upper surface of the rail beam of the power cabinet, two end points of the parting line on the outer surface of the trolley wheel are taken as parting points, the parting line on the upper surface of the rail beam of the power cabinet is divided into three sections, the middle section of the three sections is identical and overlapped with the parting line on the outer surface of the trolley wheel in length, and the overlapped sections are divided into the same unit side length or the same unit number.
By this operation all the nodes at the contact line of the battery trolley wheel and the power cabinet rail beam are spatially coincident, i.e. the nodes on the battery trolley wheel and the power cabinet rail beam at the contact line are coincident.
Further, the different working conditions include a first working condition, a second working condition, a third working condition, a fourth working condition, a fifth working condition and a sixth working condition; under the first working condition, applying a vertical impact load to the power cabinet, wherein the vertical impact load is (1+c) g, c is a constant, g is gravity acceleration, the value of c is determined by the position of the power cabinet on the vehicle, c=2 when the power cabinet is at the end of the vehicle, and c=0.5 when the power cabinet is at the middle of the vehicle;
under the second working condition, applying a vertical impact load to the power cabinet, wherein the vertical impact load is (1-c) g;
under the third working condition, applying a longitudinal impact load and dead weight to the power cabinet, wherein the longitudinal impact load is kg, and the value of k is determined by the type of the vehicle;
in the fourth working condition, applying a longitudinal impact load and dead weight to the power cabinet, wherein the longitudinal impact load is-kg;
under the fifth working condition, applying a transverse impact load and dead weight to the power cabinet, wherein the transverse impact load is g;
and under the sixth working condition, applying a transverse impact load and dead weight to the power cabinet, wherein the transverse impact load is-g.
Further, the judging method of the contact relation comprises the following steps:
restraining the vertical translational degrees of freedom of the nodes at the contact line of each wheel of the battery trolley and the track beam of the power cabinet, and restraining all degrees of freedom of the nodes of the bolt holes of the fixing support of the power cabinet;
checking vertical constraint counter force of a coincident joint at a contact line between a wheel of the battery trolley and a rail beam of the power cabinet under the impact load action of different working conditions respectively, and if the vertical constraint counter force is a tensile force, separating the wheel of the battery trolley from the rail beam of the power cabinet, wherein the wheel of the battery trolley is in a non-contact relation with the rail beam of the power cabinet; if the vertical constraint counter force is pressure, the wheel of the battery trolley is in contact with the power cabinet rail Liang Yajin, and the wheel of the battery trolley is in contact with the power cabinet rail beam.
And determining whether a connection relation between each wheel of the battery trolley and the track beam of the power cabinet is required to be established according to the judgment of the contact relation, if the connection relation exists, the connection relation is required to be established, otherwise, the connection relation is not required to be established.
Further, the judging method of the contact relation comprises the following steps:
taking a fulcrum wheel of the battery trolley, which possibly turns overturned, as a turning fulcrum, respectively calculating the overturned moment caused by the impact load of the battery trolley and the anti-overturned moment caused by the dead weight of the battery trolley; if the overturning moment is greater than or equal to the anti-overturning moment, the non-fulcrum wheels of the battery trolley are separated from the power cabinet track beam, the non-fulcrum wheels are in non-contact relation with the power cabinet track beam, the fulcrum wheels of the battery trolley are in contact relation with the power cabinet track Liang Yajin, and the fulcrum wheels are in contact relation with the power cabinet track beam; if the overturning moment is smaller than the anti-overturning moment, the non-fulcrum wheels of the battery trolley are in contact relation with the power cabinet rail Liang Yajin, the non-fulcrum wheels are in contact relation with the power cabinet rail beam, the fulcrum wheels of the battery trolley are further compressed with the power cabinet rail beam, and the fulcrum wheels are in contact relation with the power cabinet rail beam.
Further, the method for establishing the connection relation between each wheel of the battery trolley and the track beam of the power cabinet comprises the following steps:
the vertical translational degree of freedom of the coincident node at the contact line of the wheel of the coupling battery trolley and the track beam of the power cabinet ensures that the vertical translational displacement of the coincident node at the contact line is consistent evenUZ Ai = UZ Bi Wherein, the method comprises the steps of, wherein,Aiis the contact line positioniPersonal electric applianceThe wheel nodes of the pool trolley,Biis the contact line positioniThe track beam nodes of the power supply cabinet,UZ Ai is the contact line positioniVertical translational displacement of the wheel nodes of the battery trolley,UZ Bi is the contact line positioniVertical translational displacement of the rail beam nodes of the power supply cabinets,i=1,2,3，…，L，Lis the number of coincident nodes at the contact line.
The invention also provides a system for calculating the strength of the power cabinet of the trolley with the battery, which comprises the following components:
a coordinate system establishment module for establishing a three-dimensional coordinate systemxThe axis represents the direction of travel of the vehicle,zthe axis represents a direction perpendicular to the ground and upwards,ythe shaft is determined according to the right hand rule;
the geometric model building module is used for building a geometric model of the power cabinet in the three-dimensional coordinate system according to the arrangement direction of the power cabinet on the vehicle; the method is also used for establishing a geometric model of the battery trolley, placing the battery trolley into the power cabinet according to the assembly state of the battery trolley and the power cabinet during operation, and establishing a connecting bolt model between a battery trolley fixing support and a power cabinet mounting seat to obtain the geometric model of the power cabinet with the battery trolley;
the gridding processing module is used for carrying out gridding processing on the geometric model of the power cabinet of the battery trolley, and enabling all nodes of the battery trolley wheels and the power cabinet track beam at the contact line of the battery trolley wheels and the power cabinet track beam to be overlapped;
the intensity model building module is used for restraining the translational degrees of freedom of the vertical, longitudinal and transverse directions of the power cabinet fixing support and applying gravity acceleration to obtain an intensity calculation model of the power cabinet of the trolley with the battery;
the judging module is used for determining the working condition of intensity calculation on the power cabinet according to the regulation of the impact load upper limit value of the vehicle-mounted equipment by the related standard of the railway vehicle, and respectively applying impact load to the intensity calculation model under different working conditions; judging whether contact relation exists between each wheel of the battery trolley and the track beam of the power cabinet under different working conditions;
the connection relation establishing module is used for determining whether connection relations between all wheels of the battery trolley and the power cabinet track beam are required to be established under different working conditions according to the judging result of the contact relation, and if so, establishing connection relations between all wheels of the battery trolley and the power cabinet track beam under different working conditions;
the intensity calculation module is used for calculating the intensity of the battery trolley power supply cabinet under each working condition.
The invention also provides an apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, which when executed implements the method for calculating the strength of a battery-powered trolley power supply cabinet as described above.
The present invention also provides a storage medium having stored thereon a computer program which, when executed by a processor, implements a method for calculating the strength of a battery-equipped dolly power supply cabinet as described above.
Advantageous effects
Compared with the traditional contact relation, the linear connection relation is used for avoiding the uncertainty of various parameter settings of the contact relation in a nonlinear calculation model, avoiding the situation that the calculation result deviation is large and even the calculation result is not converged due to the uncertainty of the parameter settings.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawing in the description below is only one embodiment of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram of a geometric model of a power cabinet in an embodiment of the invention;
FIG. 2 is a geometric model of a battery cart in an embodiment of the invention;
FIG. 3 is a diagram showing the assembly of a power cabinet mounting base and a battery trolley fixing support in an embodiment of the invention;
FIG. 4 is a diagram showing two assembly steps of a power cabinet mounting base and a battery trolley fixing support in an embodiment of the invention;
FIG. 5 is a top perspective view of a power cabinet and battery cart assembly in an embodiment of the invention;
FIG. 6 is a bottom perspective view of an assembly of a power cabinet and a battery cart in an embodiment of the invention;
FIG. 7 is a schematic diagram of the division of the power cabinet rail beam and battery trolley wheel contact line in an embodiment of the invention;
FIG. 8 is a schematic diagram of a power cabinet rail beam and battery cart wheel grid division in an embodiment of the invention;
FIG. 9 is a model of the intensity calculation of the battery cart power supply cabinet in an embodiment of the invention;
FIG. 10 is an isometric view of a battery cart along a length in an embodiment of the invention;
FIG. 11 is an isometric view of a battery cart in a width direction in an example embodiment of the invention
FIG. 12 is a schematic view of the stress along the length of a battery cart in an embodiment of the invention;
FIG. 13 is a schematic view of the stress along the width of the battery car in an embodiment of the invention;
FIG. 14 is a schematic view of the vertical translational degrees of freedom of the coincident nodes at the contact line of the wheels of the coupled battery trolley and the rail beams of the power cabinet in an embodiment of the invention;
FIG. 15 is a schematic diagram of the connection relationship between the wheels of the battery trolley and the rail beams of the power cabinet in the strength calculation model in the embodiment of the invention;
the device comprises a 1-power cabinet, a 101-power cabinet track beam, a 102-power cabinet mounting seat, a 103-power cabinet fixing support, a 104-track beam upper surface, a 2-battery trolley, 201-battery trolley wheels, 202-battery trolley bottom beams, 203-battery trolley fixing supports, 204-wheel outer surfaces and 205-rotation fulcrums.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully by reference to the accompanying drawings, in which it is shown, however, only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The method for calculating the strength of the power cabinet of the trolley with the battery provided by the embodiment comprises the following steps:
1. establishing a three-dimensional coordinate system in intensity calculation softwarexThe axis (i.e. longitudinal) represents the direction of travel of the vehicle,zthe axis (i.e. vertical) represents a direction perpendicular to the ground and upwards,ythe axis (i.e., lateral) is determined according to the right hand rule.
The intensity calculation software is existing software, such as Ansys, abaqus, nastran, hypermesh. The origin of the three-dimensional coordinate system is not strictly defined, and in this embodiment, the origin of the three-dimensional coordinate system may be disposed at the bottom center position of the power cabinet.
2. The geometric model of the power supply cabinet 1 is built in a three-dimensional coordinate system according to the arrangement orientation of the power supply cabinet 1 on the vehicle.
The arrangement orientation of the power supply cabinet 1 on the vehicle is generally only two: firstly, the length direction of the power cabinet 1xThe axes are consistent, and the width direction of the power cabinet 1 is consistent with that ofxThe shafts are consistent, the arrangement direction of the power cabinet 1 on the vehicle is limited, and the loading of subsequent impact loads is facilitated. The power cabinet geometry model is shown in figure 1.
3. And establishing a geometric model of the battery trolley 2, placing the battery trolley 2 into the power cabinet 1 according to the assembly state of the battery trolley 2 and the power cabinet 1 during operation, and establishing a connecting bolt model between the battery trolley fixing support 203 and the power cabinet mounting seat 102 to obtain the geometric model of the power cabinet with the battery trolley.
The geometric model of the battery trolley is shown in fig. 2, and when the battery trolley is in operation, the battery trolley fixing support 203 is locked on the power cabinet mounting seat 102 through bolts, so that the battery trolley 2 shown in fig. 2 is firstly put into the power cabinet 1 shown in fig. 1 according to the assembly state of the battery trolley in operation, the battery trolley fixing support 203 and the power cabinet mounting seat 102 are ensured to reach the assembly state shown in fig. 3 and 4, a connecting bolt model with proper size is built, and the battery trolley fixing support 203 and the power cabinet mounting seat 102 are fastened together through the connecting bolt model, so that the relative movement of the battery trolley 2 and the power cabinet 1 in a horizontal plane is limited as shown in fig. 5 and 6. The power cabinet mounting seat 102 and the battery trolley fixing support 203 are respectively provided with a waist-shaped hole, the power cabinet mounting seat 102 is provided with a vertical waist-shaped hole, the battery trolley fixing support 203 is provided with a transverse waist-shaped hole, and the power cabinet mounting seat 102 and the battery trolley fixing support 203 are provided with waist-shaped holes which are perpendicular to each other, so that the power cabinet mounting seat 102 and the battery trolley fixing support 203 can be fastened together by bolts even if the assembly size errors of the power cabinet mounting seat 102 and the battery trolley fixing support 203 are larger. As shown in fig. 1, the power cabinet is provided with two mounting seats and two track beams, and as shown in fig. 2, the battery trolley is provided with two fixed supports and four wheels. As shown in fig. 5 and 6, after the battery trolley 2 is assembled on the power cabinet 1, four wheels 201 of the battery trolley 2 are in contact with the track beam 101 of the power cabinet 1, and the contact between the wheels 201 and the track beam 101 is circular-face contact, and the contact point is a contact line.
4. The geometric model of the battery trolley power supply cabinet is subjected to gridding treatment, and all nodes of the battery trolley wheels 201 and the power supply cabinet track beam 101 at the contact line of the battery trolley wheels 201 and the power supply cabinet track beam 101 are overlapped.
The center line of the wheel axle of the trolley wheel passes through a vertical plane, the vertical plane comprises a contact line between the trolley wheel 201 and the rail beam 101 of the power cabinet, the vertical plane forms a parting line on the outer surface 204 of the trolley wheel and the upper surface 104 of the rail beam of the power cabinet, two end points of the parting line on the outer surface 204 of the trolley wheel are used as parting points, the parting line on the upper surface 104 of the rail beam of the power cabinet is divided into three sections (shown in fig. 7), the middle sections in the three sections are equal to and coincide with the parting line on the outer surface 204 of the trolley wheel in length, the coinciding sections are divided into the same unit side length or the same unit number, as shown in fig. 8, the same grid size is defined for the trolley wheel 201 and the rail beam 101 of the power cabinet at the contact line, all nodes of the trolley wheel 201 and the rail beam 101 of the power cabinet at the contact line are overlapped, and model processing is carried out for establishing the connection relation between the trolley wheel 201 and the rail beam 101 of the power cabinet.
5. And constraining the translational degrees of freedom of the power cabinet fixing support 103 in the vertical direction, the longitudinal direction and the transverse direction, and applying gravity acceleration to obtain the strength calculation model of the power cabinet of the trolley with the battery.
And constraining all degrees of freedom of the bolt hole unit nodes of the power cabinet fixing support 103, simulating the situation that the geometric model of the power cabinet is fixed on a vehicle, and applying gravity acceleration to the whole model to obtain the strength calculation model of the power cabinet of the battery trolley shown in fig. 9.
6. According to the regulation of the impact load upper limit value of the vehicle-mounted equipment by the related standard of the railway vehicle, the working condition for carrying out intensity calculation on the power cabinet is determined, and impact loads are respectively applied to the intensity calculation model shown in fig. 9 under different working conditions.
The different conditions include a first condition, a second condition, a third condition, a fourth condition, a fifth condition, and a sixth condition.
Under the first working condition, a vertical impact load is applied to the power cabinet, wherein the vertical impact load is (1+c) g, c is a constant, g is a gravitational acceleration, and the value of c is determined by the position of the power cabinet on the vehicle. C=2 when the power supply cabinet is at the end of the vehicle; c=0.5 when the power supply cabinet is in the middle of the vehicle; the value of c at other positions is determined by linear interpolation.
And under the second working condition, applying a vertical impact load to the power cabinet, wherein the vertical impact load is (1-c) g.
Under the third working condition, longitudinal impact load and dead weight are applied to the power cabinet, wherein the longitudinal impact load is kg, and the value of k is determined by the type of the vehicle. According to the standard 'BS EN 12663-1-2010 railway application-structural requirement of a railway vehicle body', different railway vehicle types take different k values, the k values of a light-load subway and a tram are 2, the k values of a locomotive and a power unit, a fixed marshalling unit, a passenger car, a subway and a rapid transit vehicle and the passenger car are 3, and the k values of a railway carriage, a freight car capable of carrying out unrestricted shunting, and a freight car except for humping shunting and sliding shunting are 5.
In the fourth working condition, a longitudinal impact load and dead weight are applied to the power cabinet, and the longitudinal impact load is-kg.
And under the fifth working condition, applying a transverse impact load and dead weight to the power cabinet, wherein the transverse impact load is g.
And under the sixth working condition, applying a transverse impact load and dead weight to the power cabinet, wherein the transverse impact load is-g.
7. And judging whether contact relation exists between each wheel of the battery trolley and the track beam of the power cabinet under different working conditions.
In this embodiment, there are two methods for judging the contact relationship, one is to judge according to the constraint reaction force, and the other is to judge according to the overturning moment.
7.1 The specific process for judging the contact relation according to the constraint counter force comprises the following steps:
7.11 And constraining the vertical translational degrees of freedom of the nodes at the contact line of each wheel of the battery trolley and the track beam of the power cabinet, and constraining all degrees of freedom of the nodes of the bolt holes of the fixing support of the power cabinet.
7.12 Applying impact loads of different working conditions to the power cabinet, performing intensity calculation, checking vertical constraint counter force of a coincident joint at a contact line between the battery trolley wheel 201 and the power cabinet track beam 101 under the impact load action of the working conditions, and if the vertical constraint counter force is tensile force, separating the battery trolley wheel 201 from the power cabinet track beam 101, wherein the battery trolley wheel 201 is in non-contact relation with the power cabinet track beam 101; if the vertical constraint counter force is pressure, the battery trolley wheel 201 is pressed against the power cabinet rail beam 101, and the battery trolley wheel 201 is in contact with the power cabinet rail beam 101.
The constraint counter force constrains the object to produce the linear displacement, constraint counter force can be decomposed into lateral constraint counter force, longitudinal constraint counter force and vertical constraint counter force, wherein the vertical constraint counter force constrains the object to produce the vertical displacement. If a constraint reaction force corresponding to the constraint is generated in the actual condition, a linear displacement corresponding to the constraint reaction force is generated when the constraint reaction force is released.
7.2 The specific process for judging the contact relation according to the overturning moment is as follows:
taking a fulcrum wheel of the battery trolley, which possibly turns overturned, as a turning fulcrum 205, respectively calculating the overturned moment caused by the impact load of the battery trolley and the anti-overturned moment caused by the dead weight of the battery trolley; if the overturning moment is greater than or equal to the anti-overturning moment, the non-fulcrum wheels of the battery trolley are separated from the power cabinet track beam, the non-fulcrum wheels are in non-contact relation with the power cabinet track beam, the fulcrum wheels of the battery trolley are in contact relation with the power cabinet track Liang Yajin, and the fulcrum wheels are in contact relation with the power cabinet track beam; if the overturning moment is smaller than the anti-overturning moment, the non-fulcrum wheels of the battery trolley are in contact relation with the power cabinet rail Liang Yajin, the non-fulcrum wheels are in contact relation with the power cabinet rail beam, the fulcrum wheels of the battery trolley are further compressed with the power cabinet rail beam, and the fulcrum wheels are in contact relation with the power cabinet rail beam.
Taking the third working condition as an example, the power cabinet bears the action of longitudinal impact load kg, dead weight and other composite loads, and the dead weight of the battery trolley is supported by 4 wheels and is transmitted to the power cabinet track beam through the wheels. Once the battery trolley is additionally subjected to the action of the longitudinal impact load kg, the battery trolley can generate overturning moment, so that the battery trolley generates overturning trend along the longitudinal impact load direction, 2 wheels become rotation pivot points for overturning the battery trolley, the other 2 wheels are non-pivot point wheels, the trend of separating from the track beam is generated, and the vertical supporting force borne by the 4 wheels of the battery trolley is correspondingly changed.
For convenience of explanation, the explanation will be made with reference to fig. 10 to 13. Fig. 10 and 11 are isometric views of the battery trolley, which facilitate understanding of the connection between the bottom of the battery trolley and the power cabinet. Fig. 12 and 13 show the stress of the battery trolley in the case that the battery trolley is subjected to two longitudinal impact loads and dead weight. Fig. 12 shows the battery car receiving a longitudinal impact load kmg in the longitudinal direction of the battery car, the longitudinal impact load being directed from left to right, and the battery car receiving gravity mg in the downward direction. For conservation, neglecting vertical fastening force generated by bolts between the battery trolley fixing support and the power cabinet mounting seat, the left wheel of the battery trolley obviously has a tendency to be separated from the rail beam at the moment. Assuming that the combined supporting force of the rail beam to the left wheel is N, the right wheel forms a rotation pivot (i.e. a pivot wheel) where the battery trolley may overturn. The right wheel is used as a rotation fulcrum, the overturning moment caused by the impact load kmg of the battery trolley and the anti-overturning moment caused by the dead weight mg of the battery trolley are calculated respectively, and if the overturning moment is not less than the anti-overturning moment, the non-fulcrum wheel (namely the left wheel) of the battery trolley is separated from the track beam. The overturning moment caused by the longitudinal impact load kmg of the battery trolley is kmgH, wherein H is the vertical height between the center of gravity of the battery trolley and the rotating fulcrum of the battery trolley, and L2 is the distance between the left and right wheels in the length direction; the anti-overturning moment caused by the dead weight mg of the battery trolley is mgL1, wherein L1 is the horizontal distance between the center of gravity of the battery trolley and the rotating fulcrum of the battery trolley. If kmgH is more than or equal to mgL1, the supporting resultant force N of the track beam to the left wheel is less than or equal to 0, the left wheel is inevitably separated from the track beam, and at the moment, the connection relation between the left wheel and the track beam is not required to be established, and only the connection relation between the right wheel and the track beam is required to be established. If kmgH < mgL1, the supporting force N of the rail beam to the left wheel is greater than 0, the left wheel and the rail Liang Yajin are necessary, and the connection relationship between the left wheel and the rail beam needs to be established.
Similarly, when the vertical impact load kmg is applied to the battery trolley in the width direction of the battery trolley as shown in fig. 13, whether the left or right wheel is separated from the rail beam is determined by the overturning moment calculation method, wherein B1 is the horizontal distance between the center of gravity of the battery trolley and the fulcrum of the right wheel, B2 is the distance between the left and right wheels in the width direction, if the left wheel is separated, the connection relationship between the left end wheel and the rail beam is not required to be established, and only the connection relationship between the fulcrum wheel on the right side and the rail beam is required to be established. If neither wheel is separated from the rail beam, then it is necessary to establish a connection between all wheels and the rail beam.
8. And determining whether connection relations between all wheels of the battery trolley and the power cabinet track beam are required to be established under different working conditions according to the judgment result of the contact relation, and if so, establishing connection relations between all wheels of the battery trolley and the power cabinet track beam under different working conditions.
If the wheels of the battery trolley are in a non-contact relationship with the track beams of the power cabinet, the connection relationship between the wheels and the track beams does not need to be established; if there is a contact relationship between the battery trolley wheels and the power cabinet rail beams, then a connection relationship between the wheels and the rail beams needs to be established.
The method for establishing the connection relation between each wheel of the battery trolley and the track beam of the power cabinet comprises the following steps:
the vertical translational degree of freedom of the coincident node at the contact line of the wheel of the coupling battery trolley and the track beam of the power cabinet ensures that the vertical translational displacement of the coincident node at the contact line is consistent evenUZ Ai = UZ Bi Wherein, the method comprises the steps of, wherein,Aiis the contact line positioniThe wheel nodes of the small battery car,Biis the contact line positioniThe track beam nodes of the power supply cabinet,UZ Ai is the contact line positioniVertical translational displacement of the wheel nodes of the battery trolley,UZ Bi is the contact line positioniVertical translational displacement of the rail beam nodes of the power supply cabinets,i=1,2,3，…，L，Lis the number of coincident nodes at the contact line.
Taking the first working condition as an example, the power cabinet bears a vertical impact load (1+c) g, the inertia force points downwards, the battery trolley wheel and the power cabinet rail beam are in further compression, at the moment, the vertical translational degree of freedom of the coincident joint at the contact line of the coupling battery trolley wheel and the power cabinet rail beam is needed, as shown in fig. 14, the battery trolley wheel and the power cabinet rail beam have six pairs of coincident joints, even ifUZ A1 = UZ B1 、UZ A2 = UZ B2 、UZ A3 = UZ B3 、UZ A4 = UZ B4 、UZ A5 = UZ B5 、UZ A6 = UZ B6 These equations are satisfied simultaneously, so that the contact part of the battery trolley wheel and the power cabinet rail beam keeps synchronous movement in the vertical direction. The degree of freedom of the coupling node is realized by means of commands in simulation calculation software, but the degree of freedom of transverse translation and the degree of freedom of longitudinal translation of the wheel node on the contact line and the corresponding rail beam node and the degree of freedom of rotation around the vertical direction, the transverse direction and the longitudinal direction are not simultaneously coupled, the relative displacement of the wheel node on the contact line and the corresponding rail beam node in the directions is allowed, the state that a relative fixed relation is not formed between a calculation model and a real battery trolley wheel and a rail beam is kept consistent is ensured, the true degree of the calculation model is improved, and the accuracy of intensity calculation is improved. The linear connection relation between the wheels of the battery trolley and the track beam is respectively established under different working conditions, so that the stress and deformation conditions of the power cabinet under different working conditions can be accurately reflected, the calculation speed is high, and the calculation time is greatly saved.
For the second working condition, when the inertia force is more than or equal to 0 and is more than or equal to 1-c, the wheels of the battery trolley are separated from the track beam or have no contact force, and the strength calculation can be carried out on the power cabinet without establishing the connection relation between the wheels of the battery trolley and the track beam; when (1-c) is more than 0, the inertia force points downwards, the connection relation between the wheels of the battery trolley and the track beam of the power cabinet is established according to the method of the first working condition, and then the strength calculation of the power cabinet is carried out.
A schematic diagram of the connection relationship between the wheels of the battery trolley and the track beam of the power cabinet in the strength calculation model is shown in fig. 15. And the connection relation can be established and the strength can be calculated according to the same method under other working conditions.
9. And calculating the strength of the power cabinet of the trolley with the battery.
After the connection relation between each wheel of the battery trolley and the track beam of the power cabinet is established, different impact loads are applied to different working conditions, intensity calculation is carried out under different working conditions, the intensity calculation result of each working condition is judged, if the maximum calculation stress is smaller than the allowable stress of materials used for the power cabinet structure, the power cabinet structure under the working conditions is judged to meet the intensity requirement, otherwise, the design of the power cabinet is improved, and intensity calculation is carried out again on the improved power cabinet. Intensity calculations are performed in existing software as prior art.
The invention also provides a system for calculating the strength of the power cabinet of the trolley with the battery, which comprises the following components:
a coordinate system establishment module for establishing a three-dimensional coordinate systemxThe axis represents the direction of travel of the vehicle,zthe axis represents a direction perpendicular to the ground and upwards,ythe shaft is determined according to the right hand rule;
the geometric model building module is used for building a geometric model of the power cabinet in the three-dimensional coordinate system according to the arrangement direction of the power cabinet on the vehicle; the method is also used for establishing a geometric model of the battery trolley, placing the battery trolley into the power cabinet according to the assembly state of the battery trolley and the power cabinet during operation, and establishing a connecting bolt model between a battery trolley fixing support and a power cabinet mounting seat to obtain the geometric model of the power cabinet with the battery trolley;
the gridding processing module is used for carrying out gridding processing on the geometric model of the power cabinet of the battery trolley, and enabling all nodes of the battery trolley wheels and the power cabinet track beam at the contact line of the battery trolley wheels and the power cabinet track beam to be overlapped;
the intensity model building module is used for restraining the translational degrees of freedom of the vertical, longitudinal and transverse directions of the power cabinet fixing support and applying gravity acceleration to obtain an intensity calculation model of the power cabinet of the trolley with the battery;
the judging module is used for determining the working condition of intensity calculation on the power cabinet according to the regulation of the impact load upper limit value of the vehicle-mounted equipment by the related standard of the railway vehicle, and respectively applying impact load to the intensity calculation model under different working conditions; judging whether contact relation exists between each wheel of the battery trolley and the track beam of the power cabinet under different working conditions;
the connection relation establishing module is used for determining whether connection relations between all wheels of the battery trolley and the power cabinet track beam are required to be established under different working conditions according to the judging result of the contact relation, and if so, establishing connection relations between all wheels of the battery trolley and the power cabinet track beam under different working conditions;
the intensity calculation module is used for calculating the intensity of the battery trolley power supply cabinet under each working condition.
The foregoing disclosure is merely illustrative of specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art will readily recognize that changes and modifications are possible within the scope of the present invention.

Claims (8)

1. The method for calculating the strength of the power cabinet of the trolley with the battery is characterized by comprising the following steps of:
establishing a three-dimensional coordinate system, wherein the x-axis of the three-dimensional coordinate system represents the running direction of the vehicle, the z-axis represents the direction vertical to the ground and upwards, and the y-axis is determined according to a right-hand rule;
establishing a geometric model of the power cabinet in the three-dimensional coordinate system according to the arrangement azimuth of the power cabinet on the vehicle;
establishing a geometric model of the battery trolley, placing the battery trolley into the power cabinet according to the assembly state of the battery trolley and the power cabinet during operation, and establishing a connecting bolt model between a battery trolley fixing support and a power cabinet mounting seat to obtain the geometric model of the power cabinet with the battery trolley;
performing gridding treatment on the geometric model of the power cabinet with the battery trolley, and enabling all nodes of the battery trolley wheels and the power cabinet track beam at the contact line of the battery trolley wheels and the power cabinet track beam to be overlapped;
restraining the translational degrees of freedom of the vertical, longitudinal and transverse directions of the power cabinet fixing support, and applying gravity acceleration to obtain an intensity calculation model of the power cabinet of the trolley with the battery;
determining working conditions for carrying out intensity calculation on the power supply cabinet according to the regulation of the impact load upper limit value of the vehicle-mounted equipment by the related standard of the railway vehicle, and respectively applying impact loads to the intensity calculation model under different working conditions;
judging whether contact relation exists between each wheel of the battery trolley and the track beam of the power cabinet under different working conditions;
determining whether connection relations between all wheels of the battery trolley and the power cabinet track beam are required to be established under different working conditions according to the judgment result of the contact relation, and if so, establishing connection relations between all wheels of the battery trolley and the power cabinet track beam under different working conditions;
calculating the strength of the power cabinet of the battery trolley under each working condition;
wherein the different working conditions comprise a first working condition, a second working condition, a third working condition, a fourth working condition, a fifth working condition and a sixth working condition;
under the first working condition, applying a vertical impact load to the power cabinet, wherein the vertical impact load is (1+c) g, c is a constant, g is gravity acceleration, the value of c is determined by the position of the power cabinet on the vehicle, c=2 when the power cabinet is at the end of the vehicle, and c=0.5 when the power cabinet is at the middle of the vehicle;
under the second working condition, applying a vertical impact load to the power cabinet, wherein the vertical impact load is (1-c) g;
under the third working condition, applying a longitudinal impact load and dead weight to the power cabinet, wherein the longitudinal impact load is kg, and the value of k is determined by the type of the vehicle;
in the fourth working condition, applying a longitudinal impact load and dead weight to the power cabinet, wherein the longitudinal impact load is-kg;
under the fifth working condition, applying a transverse impact load and dead weight to the power cabinet, wherein the transverse impact load is g;
and under the sixth working condition, applying a transverse impact load and dead weight to the power cabinet, wherein the transverse impact load is-g.
2. The method for calculating the strength of the power cabinet of the battery trolley according to claim 1, wherein the specific operation process that all nodes of the wheels of the battery trolley and the track beam of the power cabinet at the contact line are overlapped is as follows:
the center line of the wheel axle of the trolley wheel is taken as a vertical plane, the vertical plane comprises a contact line between the trolley wheel and the rail beam of the power cabinet, the vertical plane forms a parting line on the outer surface of the trolley wheel and the upper surface of the rail beam of the power cabinet, two end points of the parting line on the outer surface of the trolley wheel are taken as parting points, the parting line on the upper surface of the rail beam of the power cabinet is divided into three sections, the middle section of the three sections is identical and overlapped with the parting line on the outer surface of the trolley wheel in length, and the overlapped sections are divided into the same unit side length or the same unit number.
3. The method for calculating the strength of a power cabinet of a trolley with a battery according to claim 1, wherein the method for judging the contact relationship is as follows:
restraining the vertical translational degrees of freedom of the nodes at the contact line of each wheel of the battery trolley and the track beam of the power cabinet, and restraining all degrees of freedom of the nodes of the bolt holes of the fixing support of the power cabinet;
checking vertical constraint counter force of a coincident joint at a contact line between a wheel of the battery trolley and a rail beam of the power cabinet under the impact load action of different working conditions respectively, and if the vertical constraint counter force is a tensile force, separating the wheel of the battery trolley from the rail beam of the power cabinet, wherein the wheel of the battery trolley is in a non-contact relation with the rail beam of the power cabinet; if the vertical constraint counter force is pressure, the wheel of the battery trolley is in contact with the power cabinet rail Liang Yajin, and the wheel of the battery trolley is in contact with the power cabinet rail beam.
4. The method for calculating the strength of a power cabinet of a trolley with a battery according to claim 1, wherein the method for judging the contact relationship is as follows:
taking a fulcrum wheel of the battery trolley, which possibly turns overturned, as a turning fulcrum, respectively calculating the overturned moment caused by the impact load of the battery trolley and the anti-overturned moment caused by the dead weight of the battery trolley; if the overturning moment is greater than or equal to the anti-overturning moment, the non-fulcrum wheels of the battery trolley are separated from the power cabinet track beam, the non-fulcrum wheels are in non-contact relation with the power cabinet track beam, the fulcrum wheels of the battery trolley are in contact relation with the power cabinet track Liang Yajin, and the fulcrum wheels are in contact relation with the power cabinet track beam; if the overturning moment is smaller than the anti-overturning moment, the non-fulcrum wheels of the battery trolley are in contact relation with the power cabinet rail Liang Yajin, the non-fulcrum wheels are in contact relation with the power cabinet rail beam, the fulcrum wheels of the battery trolley are further compressed with the power cabinet rail beam, and the fulcrum wheels are in contact relation with the power cabinet rail beam.
5. The method for calculating the strength of the power cabinet of the battery trolley according to any one of claims 1 to 4, wherein the method for establishing the connection relationship between each wheel of the battery trolley and the track beam of the power cabinet is as follows:
the vertical translational degree of freedom of the coincident node at the contact line of the wheel of the coupling battery trolley and the track beam of the power cabinet ensures that the vertical translational displacement of the coincident node at the contact line is consistent even if UZ Ai ＝UZ Bi Wherein Ai is the ith battery trolley wheel node at the contact line, bi is the ith power cabinet rail beam node at the contact line, and UZ is the power cabinet rail beam node at the contact line Ai Is the vertical translational displacement of the wheel node of the ith battery trolley at the contact line, UZ Bi For the vertical translational displacement of the i-th power cabinet rail beam node at the contact line, i=1, 2,3, …, L and L are the number of coincident nodes at the contact line.
6. A battery cart power cabinet strength computing system, comprising:
the coordinate system establishment module is used for establishing a three-dimensional coordinate system, wherein the x-axis of the three-dimensional coordinate system represents the running direction of the vehicle, the z-axis represents the direction vertical to the ground and upwards, and the y-axis is determined according to the right-hand rule;
the geometric model building module is used for building a geometric model of the power cabinet in the three-dimensional coordinate system according to the arrangement direction of the power cabinet on the vehicle; the method is also used for establishing a geometric model of the battery trolley, placing the battery trolley into the power cabinet according to the assembly state of the battery trolley and the power cabinet during operation, and establishing a connecting bolt model between a battery trolley fixing support and a power cabinet mounting seat to obtain the geometric model of the power cabinet with the battery trolley;
the gridding processing module is used for carrying out gridding processing on the geometric model of the power cabinet of the battery trolley, and enabling all nodes of the battery trolley wheels and the power cabinet track beam at the contact line of the battery trolley wheels and the power cabinet track beam to be overlapped;
the intensity model building module is used for restraining the translational degrees of freedom of the vertical, longitudinal and transverse directions of the power cabinet fixing support and applying gravity acceleration to obtain an intensity calculation model of the power cabinet of the trolley with the battery;
the judging module is used for determining the working condition of intensity calculation on the power cabinet according to the regulation of the impact load upper limit value of the vehicle-mounted equipment by the related standard of the railway vehicle, and respectively applying impact load to the intensity calculation model under different working conditions; judging whether contact relation exists between each wheel of the battery trolley and the track beam of the power cabinet under different working conditions; wherein the different working conditions comprise a first working condition, a second working condition, a third working condition, a fourth working condition, a fifth working condition and a sixth working condition; under the first working condition, applying a vertical impact load to the power cabinet, wherein the vertical impact load is (1+c) g, c is a constant, g is gravity acceleration, the value of c is determined by the position of the power cabinet on the vehicle, c=2 when the power cabinet is at the end of the vehicle, and c=0.5 when the power cabinet is at the middle of the vehicle; under the second working condition, applying a vertical impact load to the power cabinet, wherein the vertical impact load is (1-c) g; under the third working condition, applying a longitudinal impact load and dead weight to the power cabinet, wherein the longitudinal impact load is kg, and the value of k is determined by the type of the vehicle; in the fourth working condition, applying a longitudinal impact load and dead weight to the power cabinet, wherein the longitudinal impact load is-kg; under the fifth working condition, applying a transverse impact load and dead weight to the power cabinet, wherein the transverse impact load is g; under the sixth working condition, applying a transverse impact load and dead weight to the power cabinet, wherein the transverse impact load is-g;
the connection relation establishing module is used for determining whether connection relations between all wheels of the battery trolley and the power cabinet track beam are required to be established under different working conditions according to the judging result of the contact relation, and if so, establishing connection relations between all wheels of the battery trolley and the power cabinet track beam under different working conditions;
the intensity calculation module is used for calculating the intensity of the battery trolley power supply cabinet under each working condition.
7. An apparatus comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized by: the processor, when executing the program, implements the method for calculating the strength of the power cabinet of the battery trolley according to any one of claims 1 to 5.
8. A storage medium having a computer program stored thereon, characterized by: the program when executed by a processor implements the method for calculating the strength of a battery cart power supply cabinet according to any one of claims 1 to 5.
CN202011145432.3A 2020-10-23 2020-10-23 Method, system, equipment and storage medium for calculating strength of power cabinet of trolley with battery Active CN112257318B (en)

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