CN110362938B - ADAMS-based suspension load calculation method - Google Patents
ADAMS-based suspension load calculation method Download PDFInfo
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Abstract
The invention discloses an ADAMS-based suspension load calculation method, which comprises the following steps of: according to hard point coordinates of an upper cross arm, a lower cross arm and a spring in the double-cross arm independent suspension, a double-cross arm independent suspension rigid body model is built in an ADAMS, and according to the connection mode of the upper cross arm and a frame and a wheel set, the connection mode of the lower cross arm and the frame and the wheel set and the connection mode of the spring and the frame and the lower cross arm, constraint among all rigid rods is built in the double-cross arm independent suspension rigid body model, working condition load values needing checking are loaded at a tire, and load values of constraint positions among all the rigid rods are calculated. The method is used for calculating the space load at the interface of the suspension guiding mechanism, the frame and the wheel set, and is used for topology optimization and strength calculation of the suspension guiding mechanism and strength calculation at the joint of the frame and the wheel set and the suspension guiding mechanism.
Description
Technical Field
The invention relates to the field of vehicles, in particular to a method for calculating a vehicle suspension load.
Background
When the vehicle chassis suspension system is designed, the guide mechanism needs to perform topology optimization and strength calculation; when the frame and wheel set structure is designed, the strength of the interface between the frame and the wheel set structure and the suspension guide mechanism needs to be calculated; therefore, suspension load calculation under the limit conditions is required.
The conventional theoretical formula calculation method only can calculate the load of the suspension guide mechanism and the frame connection interface on a certain stress plane, the space load is difficult to calculate, and when the connection interface is larger than 1, the theoretical formula calculation method is not applicable.
Disclosure of Invention
The invention aims to provide an ADAMS-based suspension load calculation method, which can calculate the space load at the interfaces of a suspension guide mechanism, a frame and a wheel set, and is used for topology optimization and strength calculation of the suspension guide mechanism and strength calculation at the joints of the frame, the wheel set and the suspension guide mechanism.
The invention relates to an ADAMS-based suspension load calculation method, which comprises the following steps:
according to the hard point coordinates of the upper cross arm, the lower cross arm and the spring in the double cross arm independent suspension, a rigid body model of the double cross arm independent suspension is built in an ADAMS,
according to the connection mode of the upper cross arm and the frame and the wheel group, the connection mode of the lower cross arm and the frame and the wheel group and the connection mode of the spring and the frame and the lower cross arm, the restraint among all rigid rods is established in the double-cross arm independent suspension rigid body model,
and loading the working condition load value to be checked at the tire, and calculating to obtain the load value of the constraint position among the rigid rods.
The invention discloses an ADAMS-based suspension load calculation method, wherein hard point coordinates of an upper cross arm are upper cross arm inner side point coordinates and upper cross arm outer side point coordinates.
The invention discloses an ADAMS-based suspension load calculation method, wherein hard point coordinates of a lower cross arm are inner point coordinates of the lower cross arm and outer point coordinates of the lower cross arm.
The invention discloses an ADAMS-based suspension load calculation method, wherein the hard point coordinates of a spring are an upper spring fulcrum coordinate and a lower spring fulcrum coordinate.
The invention relates to an ADAMS-based suspension load calculation method, wherein the establishment of constraints among all rigid rods in a double-cross arm independent suspension rigid body model comprises the following steps: the upper cross arm, the lower cross arm and the frame are restrained by adopting a rotary pair, the upper cross arm, the lower cross arm and the wheel set are restrained by adopting a spherical hinge pair, the upper support lugs of the springs are restrained by adopting a spherical hinge pair, and the lower support lugs of the springs are restrained by adopting a spherical hinge pair.
The invention relates to an ADAMS-based suspension load calculation method, wherein the working condition load value to be checked when being loaded at a tire is specifically as follows: loading a working condition load value to be checked at a wheel grounding point, wherein the working condition load value is an input load of a typical working condition, and the input load of the typical working condition comprises a static load working condition, a 3-time static load working condition, a rollover working condition and an emergency braking working condition.
The invention discloses an ADAMS-based suspension load calculation method, wherein when the working condition load value is the input load of a static load working condition, the stress of an upper cross arm inner point, an upper cross arm outer point, a lower cross arm inner front point, a lower cross arm inner rear point, a lower cross arm outer point and a spring lower fulcrum is calculated.
The invention discloses an ADAMS-based suspension load calculation method, wherein when the working condition load value is 3 times of the input load of a static load working condition, the stress of an upper cross arm inner point, an upper cross arm outer point, a lower cross arm inner front point, a lower cross arm inner rear point, a lower cross arm outer point and a spring lower fulcrum is calculated.
The invention discloses an ADAMS-based suspension load calculation method, wherein when the working condition load value is the input load of a side-turning working condition, the stress of an upper cross arm inner point, an upper cross arm outer point, a lower cross arm inner front point, a lower cross arm inner rear point, a lower cross arm outer point and a spring lower pivot point is calculated.
The invention discloses an ADAMS-based suspension load calculation method, wherein when the working condition load value is the input load of an emergency braking working condition, the stress of an upper cross arm inner point, an upper cross arm outer point, a lower cross arm inner front point, a lower cross arm inner rear point, a lower cross arm outer point and a spring lower fulcrum is calculated.
The ADAMS-based suspension load calculation method is based on ADAMS multi-body dynamics simulation calculation software, a double-cross arm independent suspension system dynamics calculation model is established, loads at interfaces of a guiding mechanism (namely an upper cross arm and a lower cross arm) of a suspension, a frame and a wheel set can be calculated, and the method is used for topology optimization and strength calculation of the guiding mechanism of the suspension and strength calculation at joints of the frame and the wheel set and the guiding mechanism of the suspension.
The invention is further described below with reference to the accompanying drawings.
Drawings
FIG. 1 is a flow chart of an ADAMS-based suspension load calculation method of the present invention;
fig. 2 is an ADAMS model for suspension load calculation in the present invention.
Detailed Description
As shown in fig. 1, the ADAMS-based suspension load calculation method of the invention comprises the following steps:
according to the hard point coordinates of the upper cross arm, the lower cross arm and the spring in the double cross arm independent suspension, a rigid body model (shown in figure 2) of the double cross arm independent suspension is built in an ADAMS,
according to the connection mode of the upper cross arm and the frame and the wheel group, the connection mode of the lower cross arm and the frame and the wheel group and the connection mode of the spring and the frame and the lower cross arm, the restraint among all rigid rods is established in the double-cross arm independent suspension rigid body model,
and loading the working condition load value to be checked at the tire, and calculating to obtain the load value of the constraint position among the rigid rods.
The invention discloses an ADAMS-based suspension load calculation method, wherein hard point coordinates of an upper cross arm are upper cross arm inner side point coordinates and upper cross arm outer side point coordinates.
The invention discloses an ADAMS-based suspension load calculation method, wherein hard point coordinates of a lower cross arm are inner point coordinates of the lower cross arm and outer point coordinates of the lower cross arm.
The invention discloses an ADAMS-based suspension load calculation method, wherein the hard point coordinates of a spring are an upper spring fulcrum coordinate and a lower spring fulcrum coordinate.
The invention relates to an ADAMS-based suspension load calculation method, wherein the establishment of constraints among all rigid rods in a double-cross arm independent suspension rigid body model comprises the following steps: the upper cross arm, the lower cross arm and the frame are restrained by adopting a rotary pair, the upper cross arm, the lower cross arm and the wheel set are restrained by adopting a spherical hinge pair, the upper support lugs of the springs are restrained by adopting a spherical hinge pair, and the lower support lugs of the springs are restrained by adopting a spherical hinge pair.
The invention relates to an ADAMS-based suspension load calculation method, wherein the working condition load value to be checked when being loaded at a tire is specifically as follows: loading a working condition load value to be checked at a wheel grounding point, wherein the working condition load value is an input load of a typical working condition, and the input load of the typical working condition comprises a static load working condition, a 3-time static load working condition, a rollover working condition and an emergency braking working condition.
The invention discloses an ADAMS-based suspension load calculation method, wherein when the working condition load value is the input load of a static load working condition, the stress of an upper cross arm inner point, an upper cross arm outer point, a lower cross arm inner front point, a lower cross arm inner rear point, a lower cross arm outer point and a spring lower fulcrum is calculated.
The invention discloses an ADAMS-based suspension load calculation method, wherein when the working condition load value is 3 times of the input load of a static load working condition, the stress of an upper cross arm inner point, an upper cross arm outer point, a lower cross arm inner front point, a lower cross arm inner rear point, a lower cross arm outer point and a spring lower fulcrum is calculated.
The invention discloses an ADAMS-based suspension load calculation method, wherein when the working condition load value is the input load of a side-turning working condition, the stress of an upper cross arm inner point, an upper cross arm outer point, a lower cross arm inner front point, a lower cross arm inner rear point, a lower cross arm outer point and a spring lower pivot point is calculated.
The invention discloses an ADAMS-based suspension load calculation method, wherein when the working condition load value is the input load of an emergency braking working condition, the stress of an upper cross arm inner point, an upper cross arm outer point, a lower cross arm inner front point, a lower cross arm inner rear point, a lower cross arm outer point and a spring lower fulcrum is calculated.
The ADAMS-based suspension load calculation method is based on ADAMS multi-body dynamics simulation calculation software, a double-cross arm independent suspension system dynamics calculation model is established, loads at interfaces of a guiding mechanism (namely an upper cross arm and a lower cross arm) of a suspension, a frame and a wheel set can be calculated, and the method is used for topology optimization and strength calculation of the guiding mechanism of the suspension and strength calculation at joints of the frame and the wheel set and the guiding mechanism of the suspension.
The invention is described in further detail below in conjunction with the tables:
(1) And establishing the hard point coordinates of the suspension system in the ADAMS according to the hard point coordinates of the double-cross arm independent suspension, wherein the required hard point coordinates of the suspension are shown in table 1. And according to the actual structure of the suspension, a rigid rod is established between hard point coordinates, and a rigid body model of the suspension system is established.
Table 1 double Cross arm independent suspension hard point
(2) And establishing constraint among all the rigid rods in the ADAMS according to the types of the guide mechanisms (namely the upper cross arm and the lower cross arm) of the suspension system, the motion pairs of the frame and the wheel set. The guide mechanism and the frame are restrained by adopting a rotary pair, the guide mechanism and the wheel set are restrained by adopting a spherical hinge pair, the upper spring support lug and the frame are restrained by adopting a spherical hinge pair, and the lower spring support lug and the lower cross arm are restrained by adopting a spherical hinge pair.
(3) The suspension elastic damping element is built in an ADAMS model by using a spiral spring and a shock absorber model, and the stiffness of the spring and the damping of the shock absorber can be set.
(4) The wheel ground point is loaded with input loads of typical working conditions, which are shown in table 2, including a dead load condition, a 3-fold dead load condition, a rollover condition and an emergency braking condition.
TABLE 2 typical operating condition input load
(5) According to the input load of each typical working condition, the stress at the joint of the suspension system and other systems is calculated, and the load is used as the load input for the topology optimization and strength calculation of the suspension guide mechanism and the load input for the strength check at the joint of the frame wheel group and the suspension as shown in the table 3.
TABLE 3 typical operating mode suspension load conditions
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (5)
1. An ADAMS-based suspension load calculation method is characterized by comprising the following steps:
according to the hard point coordinates of an upper cross arm, a lower cross arm and a spring in the double-cross arm independent suspension, the hard point coordinates of the upper cross arm are the inner side point coordinates of the upper cross arm and the outer side point coordinates of the upper cross arm, the hard point coordinates of the lower cross arm are the inner side point coordinates of the lower cross arm and the outer side point coordinates of the lower cross arm, the hard point coordinates of the spring are the upper pivot coordinates of the spring and the lower pivot coordinates of the spring, a rigid body model of the double-cross arm independent suspension is built in an ADAMS,
according to the connection mode of the upper cross arm and the frame and the wheel group, the connection mode of the lower cross arm and the frame and the wheel group and the connection mode of the spring and the frame and the lower cross arm, establishing constraints among all the rigid rods in the double-cross arm independent suspension rigid body model comprises the following steps: the upper cross arm, the lower cross arm and the frame are all restrained by adopting a rotary pair, the upper cross arm, the lower cross arm and the wheel set are all restrained by adopting a spherical hinge pair, the upper support lug of the spring and the frame are restrained by adopting a spherical hinge pair, the lower support lug of the spring and the lower cross arm are also restrained by adopting a spherical hinge pair,
loading a working condition load value to be checked at a tire, wherein the working condition load value to be checked is loaded at the tire specifically: loading a working condition load value to be checked at a wheel grounding point, wherein the working condition load value is an input load of a typical working condition, the input load of the typical working condition comprises a static load working condition, a 3-time static load working condition, a side turning working condition and an emergency braking working condition,
and calculating to obtain the load value of the constraint position between the rigid rods.
2. The ADAMS-based suspension load calculation method according to claim 1, wherein: and when the working condition load value is the input load of the static load working condition, calculating to obtain the stress of the inner point of the upper cross arm, the outer point of the upper cross arm, the inner front point of the lower cross arm, the inner rear point of the lower cross arm, the outer point of the lower cross arm and the lower pivot of the spring.
3. The ADAMS-based suspension load calculation method according to claim 2, wherein: and when the working condition load value is 3 times of the input load of the static load working condition, the stress of the upper cross arm inner point, the upper cross arm outer point, the lower cross arm inner front point, the lower cross arm inner rear point, the lower cross arm outer point and the spring lower pivot point is calculated.
4. The ADAMS-based suspension load calculation method according to claim 3, wherein: and when the working condition load value is the input load of the side-turning working condition, calculating to obtain the stress of the inner point of the upper cross arm, the outer point of the upper cross arm, the inner front point of the lower cross arm, the inner rear point of the lower cross arm, the outer point of the lower cross arm and the lower pivot of the spring.
5. The ADAMS-based suspension load calculation method according to claim 4, wherein: and when the working condition load value is the input load of the emergency braking working condition, the stress of the upper cross arm inner point, the upper cross arm outer point, the lower cross arm inner front point, the lower cross arm inner rear point, the lower cross arm outer point and the spring lower pivot point is calculated.
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