CN110702310B - Device and method for measuring inertial parameters of automobile parts - Google Patents
Device and method for measuring inertial parameters of automobile parts Download PDFInfo
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- CN110702310B CN110702310B CN201911105984.9A CN201911105984A CN110702310B CN 110702310 B CN110702310 B CN 110702310B CN 201911105984 A CN201911105984 A CN 201911105984A CN 110702310 B CN110702310 B CN 110702310B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention belongs to the technical field of automobile part measurement, and discloses an automobile part inertial parameter measuring device and method, wherein the device comprises a base; a rotating disk disposed on the base, the rotating disk configured to be elastically twistable about a central axis thereof; the supporting frame is fixedly connected to the rotating disc and is configured to drive the piece to be tested to turn around an X axis and a Y axis; the four pulling pressure sensors are fixedly connected to the rotating disc and are respectively connected to the edge of the supporting frame along the Z shaft. The invention has the beneficial effects that: the mass, the mass center, the rotational inertia, the inertia product and other inertia parameters of the automobile parts with different shapes and smaller mass can be accurately measured.
Description
Technical Field
The invention relates to the technical field of automobile part measurement, in particular to an automobile part inertia parameter measuring device and method.
Background
The moment of inertia is a fundamental physical quantity in mechanics, the value of which depends on the shape of the object, the mass distribution and the position of the chosen axis of rotation. For a rigid body with simple geometric shape and uniform mass distribution, the rotational inertia of the rigid body relative to a certain determined rotating shaft can be directly calculated by a formula; however, for an object with a complex shape and uneven mass distribution, the moment of inertia can only be accurately measured by a test method.
At present, methods for measuring the rotational inertia of the object mainly comprise a compound pendulum method, a three-line pendulum method, a torsion pendulum method and the like, and no method for better testing the inertial parameters of automobile parts with small mass (within 20kg of mass) exists.
Disclosure of Invention
The invention aims to provide a device and a method for measuring inertial parameters of automobile parts, which can measure the inertial parameters of automobile parts with smaller mass and different shapes
To achieve the purpose, the invention provides the following technical scheme:
in one aspect, the present invention provides an inertial parameter measuring device for an automobile part, comprising:
a base;
a rotating disk disposed on the base, the rotating disk configured to be elastically twistable about a central axis thereof;
the supporting frame is fixedly connected to the rotating disc and is configured to drive the piece to be tested to turn around an X axis and a Y axis;
the four pulling pressure sensors are fixedly connected to the rotating disc and are respectively connected to the edge of the supporting frame along the Z shaft.
Preferably, the base is provided with a plurality of accommodating grooves which are arranged along a circle, the accommodating grooves are arc-shaped, each accommodating groove is internally provided with an elastic part, the rotary disk is arranged on the base and provided with a plurality of through holes which are arranged along the circle, the through holes are in one-to-one correspondence with the accommodating grooves along a Z axis, the through holes are arc-shaped, and two ends of each elastic part are respectively connected with the inner walls of the accommodating grooves and the inner walls of the corresponding through holes.
Preferably, the supporting frame is arranged on the rotating disc and comprises two circular guide rails which are arranged in an orthogonal mode, the two circular guide rails are communicated with each other at the top and the bottom of the circular guide rails respectively, and a positioning piece is arranged on the circular guide rails in a sliding mode and is configured to fix the piece to be detected.
On the other hand, the invention also provides an automobile part inertia parameter measuring method, which comprises the following steps of:
measuring the spatial distance of the reference point of the piece to be measured relative to the central point O of the support frame;
respectively obtaining the pressure value of each pulling pressure sensor when the piece to be detected is at different rotating positions and the rotating period of the rotating disc when the piece to be detected is at a plurality of rotating positions;
calculating the mass centers of the to-be-measured piece in the directions of the X axis, the Y axis and the Z axis respectively according to the pressure values and the space distances;
according to the rotation period, obtaining the rotational inertia of the piece to be detected on an X axis, a Y axis and a Z axis and the inertia products of the X axis-Y axis, the X axis-Z axis and the Y axis-Z axis;
and respectively obtaining the mass center moments of inertia of the to-be-detected piece on the X axis, the Y axis and the Z axis and the mass center products of inertia of the X axis-Y axis, the X axis-Z axis and the Y axis-Z axis according to the rotational inertia and the products of inertia.
Preferably, the step of measuring the spatial distance between the reference point of the object to be measured and the center point O of the support frame comprises:
leveling the base and the rotating disk, and initializing the pull pressure sensor to return to zero;
establishing and setting a horizontal reference surface and the reference point of the piece to be detected, and establishing an X axis, a Y axis and a Z axis based on the piece to be detected;
the positioning piece fixes the to-be-detected piece at an initial position, and the initial position is that the horizontal reference surface is parallel to the rotating disc.
Preferably, the step of respectively obtaining the pressure value of each of the tension and pressure sensors when the object to be tested is at different rotational positions, and the rotation period of the rotating disc at several of the rotational positions includes:
and adjusting to an initial test position, detaching the to-be-tested piece, simultaneously keeping the position of the positioning piece positioned at different rotating positions, and respectively obtaining corresponding rotating cycles of the rotating disc.
Preferably, in the step of respectively obtaining the pressure value of each pulling and pressing force sensor when the piece to be detected is at different rotating positions, and the rotating period of the rotating disc when the rotating positions are a plurality of the rotating positions:
the rotating position comprises an initial position, a first position of a piece to be detected rotating by 45 degrees around a Y axis, a second position of the piece to be detected rotating by 90 degrees around the Y axis, a third position of the piece to be detected rotating by 45 degrees around the X axis after rotating by 90 degrees around the Y axis, a fourth position of the piece to be detected rotating by 90 degrees around the X axis after rotating by 90 degrees around the Y axis, and a fifth position of the piece to be detected rotating by 45 degrees around the Y axis after rotating by 90 degrees around the X axis.
Preferably, the step of calculating the centroids of the to-be-measured object in the directions of the X axis, the Y axis and the Z axis according to the pressure values and the spatial distances includes:
constructing a centroid calculation formula in the X-axis direction:
in the formula:
xcindicating the distance of the centroid of the object to be measured from the reference point along the X-axisxRepresents the distance, P, from the reference point to the center point 0 along the X-axisx1～Px4Respectively representing the pressure values of the four pull pressure sensors when the piece to be detected is at the initial position, and R represents the distance between the sensing end of the pull pressure sensor and the central point 0;
in the same way, a mass center calculation formula in the Y-axis and Z-axis directions can be constructed, and the distance Y between the mass center of the to-be-detected piece and the reference point along the Y-axis direction is obtainedcAnd the distance Z between the mass center of the object to be measured and the reference point along the Z-axis directionc。
Preferably, the step of obtaining the inertia moments of the to-be-measured object on the X axis, the Y axis and the Z axis and the products of inertia of the X axis-Y axis, the X axis-Z axis and the Y axis-Z axis according to the rotation period includes:
constructing the rotational inertia I of the piece to be measured on the X axisxxThe calculation formula of (2):
in the formula:
Tx is all 2Indicating the period of rotation of the rotating disc, T, of the object to be measured in the second position0x is equal to 2The rotation period of the rotating disc is shown when the to-be-detected piece is not placed and the positioning piece is adjusted to enable the to-be-detected piece to be fixed at the second position, and K represents the rigidity coefficient of the elastic piece;
similarly constructing inertia product I of X-axis and Y-axis of piece to be detectedxyA calculation formula of (A), and a rotational inertia I of the to-be-measured member on the Y axisyyA calculation formula of (1) and an inertia product I of a Y axis and a Z axis of a piece to be measuredyzA calculation formula of (A), and a rotational inertia I of the to-be-measured member on the Z axiszzAnd a to-be-measured member XProduct of inertia I of axis-ZxzRespectively obtaining the inertia product I of the X axis and the Y axis of the piece to be measuredxyThe rotational inertia I of the piece to be measured on the Y axisyyAnd inertia product I of Y-axis-Z-axis of the piece to be measuredyzThe rotational inertia I of the part to be measured on the Z axiszzAnd the inertia product I of the X-Z axis of the piece to be measuredxz。
Preferably, the step of obtaining the centroid moments of inertia of the to-be-measured object on the X axis, the Y axis and the Z axis and the centroid products of inertia of the X axis-Y axis, the X axis-Z axis and the Y axis-Z axis respectively according to the moment of inertia and the products of inertia includes:
constructing mass center moment of inertia I of to-be-detected piece in X-axis directionxxcThe calculation formula of (2):
Ixxc＝Ixx-m·xc 2；
wherein m represents the mass of the piece to be measured;
constructing mass center inertia product I of X axis-Y axis of piece to be detectedxycThe calculation formula of (2):
Ixyc＝Ixy-m·(xc 2+xc 2)；
similarly, a mass center moment of inertia I of the part to be measured in the Y-axis direction is establishedyycA mass center moment of inertia I of the workpiece to be measured in the Z-axis directionzzcThe calculation formula of (A) and the mass center inertia product I of the X-Z axis of the piece to be measuredxzcThe calculation formula and the mass center inertia product I of the Y axis-Z axis of the piece to be measuredyzcRespectively obtaining the mass center moment of inertia I of the piece to be measured in the Y-axis directionyycMass center moment of inertia I of to-be-measured piece in Z-axis directionzzcMass center inertia product I of X-Z axis of piece to be measuredxzcAnd mass center inertia product I of Y-Z axis of the piece to be measuredyzc。
The invention has the beneficial effects that: the mass, the mass center, the rotational inertia, the inertia product and other inertia parameters of the automobile parts with different shapes and smaller mass can be accurately measured.
Drawings
FIG. 1 is a schematic structural diagram of an inertial parameter measuring device of an automobile part according to an embodiment of the invention;
FIG. 2 is an exploded view of an inertial parameter measuring device for an automotive part according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for measuring inertial parameters of an automobile part according to an embodiment of the invention.
In the figure:
1-a base; 2-rotating the disc; 3-a support frame; 4-a pull pressure sensor;
11-a holding tank; 12-an elastic member; 21-a through hole; 31-circular ring guide rail.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The invention provides an automobile part inertial parameter measuring device, as shown in fig. 1 and 2, the automobile part inertial parameter measuring device comprises a base 1, a rotating disk 2, a support frame 3 and pull pressure sensors 4, wherein the rotating disk 2 is arranged on the base 1, the rotating disk 2 is configured to be capable of elastically twisting around a central axis of the rotating disk 2, the support frame 3 is fixedly connected to the rotating disk 2, the support frame 3 is configured to be capable of driving a part to be measured to overturn around an X axis and a Y axis, the number of the pull pressure sensors 4 is four, and the four pull pressure sensors 4 are fixedly connected to the rotating disk 2 and are respectively connected to two ends of the X axis and the Y axis of the support frame 3 along the Z axis.
In this embodiment, base 1 is equipped with six holding tanks 11 along circular arrangement, holding tank 11 is arc, be 60 intervals between two adjacent holding tanks 11 promptly, be equipped with an elastic component 12 in every holding tank 11, rotary disk 2 sets up on base 1, rotary disk 2 is equipped with the through-hole 21 of a plurality of along circular arrangement, through-hole 21 and holding tank 11 are along Z axle one-to-one, through-hole 21 is arc, the inner wall of holding tank 11 and the inner wall of the through-hole 21 that corresponds are connected respectively to the both ends of every elastic component 12, when the control is rotatory, rotary disk 2 drives elastic component 12 and compresses along length direction, loosen rotary disk 2 back, elastic component 12 restores and drives rotary disk 2 and gets back to the primary position.
In this embodiment, the elastic member 12 is a spring.
The supporting frame 3 is arranged on the rotating disc 2, the supporting frame 3 comprises two circular ring-shaped guide rails 31 which are orthogonally arranged, the two circular ring-shaped guide rails 31 are respectively communicated with each other at the top and the bottom of the circular ring-shaped guide rails 31, and two positioning pieces are arranged on the circular ring-shaped guide rails 31 in a sliding mode and are configured to fix the piece to be detected.
The invention also provides a method for measuring the inertial parameters of the automobile parts, which utilizes the device for measuring the inertial parameters of the automobile parts.
Referring to fig. 3, the method for measuring inertial parameters of automobile parts comprises the following steps:
measuring the spatial distance of the reference point of the piece to be measured relative to the central point O of the support frame 3;
respectively obtaining the pressure value of each pulling pressure sensor 4 when the piece to be detected is at different rotating positions and the rotating period of the rotating disc at a plurality of rotating positions;
calculating the mass centers of the to-be-measured piece in the X-axis direction, the Y-axis direction and the Z-axis direction respectively according to the pressure values and the space distances;
according to the rotation period, obtaining the rotational inertia of the to-be-detected piece on the X axis, the Y axis and the Z axis, and the inertia products of the to-be-detected piece on the X axis, the Y axis and the Z axis, the X axis, the Z axis and the Y axis, the Z axis and the Z axis;
and respectively obtaining the mass center moments of inertia of the to-be-detected piece on the X axis, the Y axis and the Z axis and the mass center products of inertia of the X axis-Y axis, the X axis-Z axis and the Y axis-Z axis according to the rotational inertia and the products of inertia.
Specifically, firstly, a base 1 and a rotating disk 2 of the automobile part inertia parameter measuring device are leveled, a pull pressure sensor 4 is initialized to zero, a horizontal reference plane X plane and a reference point O (not shown in the figure) of the piece to be measured are established and set, and an X axis, a Y axis and a Z axis based on the piece to be measured are established by utilizing a right-hand rule.
The horizontal reference surface of the piece to be measured is parallel to the rotating disk 2 by mounting the piece to be measured on the support frame 3. Measuring the distance of the reference point relative to the center point O of the support frame 3 and recording lx，ly，lzSimultaneously recording the pressure values P of the four pull pressure sensors 4 at the initial positionx1、Px2、Px3、Px4. The motor cam mechanism is utilized to enable the rotating disc 2 to rotate 3 degrees around the center of the rotating disc 2 and to be released quickly, and meanwhile, the high-precision photoelectric sensor is utilized to measure the rotating period T of the rotating disc 2 at the momentzAfter multiple measurements, the mean value T of the calculator is calculatedz is all。
And moving the positioning piece to enable the piece to be detected to rotate by 45 degrees around the Y axis and lock the piece to be detected at the first position.
The motor cam mechanism is reused to enable the rotating disc 2 to rotate by 3 degrees around the center of the rotating disc 2 and to be released quickly, and meanwhile, the high-precision photoelectric sensor is used for measuring the rotating period T of the rotating disc 2 at the momentxzAfter multiple measurements, the mean value T of the calculator is calculatedxz is all。
Moving the positioning part to enable the to-be-measured piece to continuously rotate 45 degrees around the Y axis, namely, the to-be-measured piece rotates 90 degrees from the initial position relative to the Y axis and is locked at the second position, and simultaneously recording the pressure values P of the four pull pressure sensors 4 at the momentz1、Pz2、Pz3、Pz4. The rotating disk 2 is again rotated by 3 ° and rapidly released, and at the same time, its rotation period T is testedxThe mean value T is calculated by multiple measurementsx is all。
Moving the positioning piece to enable the to-be-tested piece to continuously rotate 45 degrees around the X axis, namely rotate 45 degrees from the initial position relative to the X axis and rotate 90 degrees relative to the Y axis, locking the to-be-tested piece at the third position, enabling the rotating disc 2 to rotate 3 degrees and quickly release, and simultaneously testing the rotating period T of the to-be-tested piecexyThe mean value T is calculated by multiple measurementsxy are all。
Moving the positioning part to enable the to-be-measured piece to continuously rotate 45 degrees around the X axis, namely rotate 90 degrees from the initial position relative to the X axis and rotate 90 degrees relative to the Y axis, locking the to-be-measured piece at the fourth position, and simultaneously recording the pressure values P of the four pull pressure sensors 4 at the momenty1、Py2、Py3、Py4Rotating the rotary disk 2 by 3 DEG and rapidly releasing it, and at the same time, testing the period of rotation TyThe mean value T is calculated by multiple measurementsy are all。
Moving the positioning piece to enable the piece to be tested to continuously rotate 45 degrees in the reverse direction around the Y axis, namely, the piece to be tested rotates 90 degrees relative to the X axis from the initial position and rotates 45 degrees relative to the Y axis, and is locked at the fifth position to enable the rotating disc 2 to rotate 3 degrees and quickly release, and meanwhile, testing the rotating period T of the piece to be testedyzThe mean value T is calculated by multiple measurementsyz all are。
Adjusting the inertial parameter measuring device to the initial position, unloading the part to be measured, and simultaneously maintaining the position of the positioning part of the support frame 3 and mounting the part to be measuredAnd (5) the consistency is achieved. Repeating the above steps under the condition of no piece to be measured to respectively obtain corresponding rotation periods T0z is all、T0xz is equal to、T0x is equal to、T0xy are all、T0y are allAnd T0yz is all。
Further, the following formula is constructed to calculate the mass center of the piece to be measured in the X-axis direction:
in the formula: x is the number ofcThe distance between the mass center of the to-be-measured piece and the reference point along the X-axis direction is represented, and R represents the distance between the sensing end of the pull pressure sensor 4 and the central point O.
Similarly, the mass center of the piece to be measured in the Y-axis direction is as follows:
in the formula: y iscAnd the distance between the mass center of the piece to be measured and the reference point along the Y-axis direction is represented.
Similarly, the mass center of the piece to be measured in the Z-axis direction is as follows:
in the formula: z is a radical ofcAnd the distance between the mass center of the piece to be measured and the reference point along the Z-axis direction is represented.
Continuously constructing the rotational inertia I of the piece to be measured on the X axisxxThe calculation formula of (2):
in the formula:
Tx is all 2Indicating the period of rotation, T, of the rotating disc 2 when the object is in the second position0x is equal to 2Means that the positioning member is adjusted to fix the object to be measured on the second member while the object to be measured is not placedPosition is the period of rotation of the rotating disc 2.
Similarly constructing inertia product I of X-axis and Y-axis of piece to be detectedxyA calculation formula of (A), and a rotational inertia I of the to-be-measured member on the Y axisyyA calculation formula of (1) and an inertia product I of a Y axis and a Z axis of a piece to be measuredyzA calculation formula of (A), and a rotational inertia I of the to-be-measured member on the Z axiszzAnd the inertia product I of the X axis and the Z axis of the piece to be measuredxzRespectively obtaining the inertia product I of the X axis and the Y axis of the piece to be measuredxyThe rotational inertia I of the piece to be measured on the Y axisyyAnd inertia product I of Y-axis-Z-axis of the piece to be measuredyzThe rotational inertia I of the part to be measured on the Z axiszzAnd the inertia product I of the X-Z axis of the piece to be measuredxz。
Further constructing the mass center moment of inertia I of the piece to be measured in the X-axis directionxxcThe calculation formula of (2):
Ixxc＝Ixx-m·xc 2；
wherein m represents the mass of the test piece.
Constructing mass center inertia product I of X axis-Y axis of piece to be detectedxycThe calculation formula of (2):
Ixyc＝Ixy-m·(xc 2+xc 2)。
similarly, a mass center moment of inertia I of the part to be measured in the Y-axis direction is establishedyycA mass center moment of inertia I of the workpiece to be measured in the Z-axis directionzzcThe calculation formula of (A) and the mass center inertia product I of the X-Z axis of the piece to be measuredxzcThe calculation formula and the mass center inertia product I of the Y axis-Z axis of the piece to be measuredyzcRespectively obtaining the mass center moment of inertia I of the piece to be measured in the Y-axis directionyycMass center moment of inertia I of to-be-measured piece in Z-axis directionzzcMass center inertia product I of X-Z axis of piece to be measuredxzcAnd mass center inertia product I of Y-Z axis of the piece to be measuredyzc。
In conclusion, the device and the method provided by the invention can accurately measure the inertia parameters such as mass, mass center, rotational inertia, inertia product and the like of automobile parts with different shapes and smaller mass.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. An automobile part inertial parameter measuring device is characterized by comprising:
a base (1);
a rotary disk (2), the rotary disk (2) being disposed on the base (1), the rotary disk (2) being configured to be elastically twistable about a central axis thereof;
the supporting frame (3) is fixedly connected to the rotating disc (2), and the supporting frame (3) is configured to be capable of driving the piece to be tested to turn around an X axis and a Y axis;
the four tension and pressure sensors (4) are fixedly connected to the rotating disc (2) and are respectively connected to the edge of the supporting frame (3) along a Z shaft;
wherein, support frame (3) set up on rotary disk (2), support frame (3) include two ring shape guide rail (31) that the quadrature was arranged, two ring shape guide rail (31) communicate each other in its top and bottom respectively, it is equipped with the setting element to slide on ring shape guide rail (31), the setting element is configured as fixedly to await measuring.
2. The inertia parameter measuring device of claim 1, wherein the base (1) has a plurality of receiving slots (11) arranged along a circle, the receiving slots (11) are circular arc-shaped, each receiving slot (11) has an elastic member (12) therein, the rotating disc (2) is disposed on the base (1), the rotating disc (2) has a plurality of through holes (21) arranged along a circle, the through holes (21) are in one-to-one correspondence with the receiving slots (11) along the Z-axis, the through holes (21) are circular arc-shaped, and two ends of each elastic member (12) are respectively connected to the inner walls of the receiving slots (11) and the corresponding inner walls of the through holes (21).
3. An automobile part inertial parameter measuring method, characterized in that, by using the automobile part inertial parameter measuring device of claim 2, the automobile part inertial parameter measuring method comprises the following steps:
measuring the spatial distance of the reference point of the piece to be measured relative to the central point O of the support frame (3);
respectively obtaining the pressure value of each pulling pressure sensor (4) when the piece to be detected is at different rotating positions and the rotating period of the rotating disc (2) when the piece to be detected is at a plurality of the rotating positions;
calculating the mass centers of the to-be-measured piece in the directions of the X axis, the Y axis and the Z axis respectively according to the pressure values and the space distances;
according to the rotation period, obtaining the rotational inertia of the piece to be detected on an X axis, a Y axis and a Z axis and the inertia products of the X axis-Y axis, the X axis-Z axis and the Y axis-Z axis;
and respectively obtaining the mass center moments of inertia of the to-be-detected piece in the directions of the X axis, the Y axis and the Z axis and the mass center products of inertia of the X axis-Y axis, the X axis-Z axis and the Y axis-Z axis according to the rotational inertia and the products of inertia.
4. The method for measuring inertial parameters of automotive parts according to claim 3, characterized in that said step of measuring the spatial distance of the reference point of said piece to be measured with respect to the central point O of said support (3) is preceded by:
leveling the base (1) and the rotating disk (2), and initializing the pull pressure sensor (4) to zero;
establishing and setting a horizontal reference surface and the reference point of the piece to be detected, and establishing an X axis, a Y axis and a Z axis based on the piece to be detected;
the positioning piece fixes the piece to be detected at an initial position, and the horizontal reference surface is parallel to the rotating disc (2) at the initial position.
5. The method for measuring inertial parameters of automotive parts according to claim 4, characterized in that said step of obtaining respectively the pressure values of each of said tension and pressure sensors (4) when said piece to be measured is in different rotation positions, and the rotation period of said rotating disc (2) in several of said rotation positions comprises:
and adjusting to an initial test position, detaching the to-be-tested piece, simultaneously keeping the position of the positioning piece positioned at different rotating positions, and respectively obtaining corresponding rotating cycles of the rotating disc (2).
6. The method for measuring inertial parameters of automotive parts according to claim 5, characterized in that in said step of obtaining respectively the pressure values of each of said tension and pressure sensors (4) when said piece to be measured is in different rotation positions, and in the rotation cycles of said rotating disc (2) in several of said rotation positions:
the rotating position comprises an initial position, a first position of a piece to be detected rotating by 45 degrees around a Y axis, a second position of the piece to be detected rotating by 90 degrees around the Y axis, a third position of the piece to be detected rotating by 45 degrees around the X axis after rotating by 90 degrees around the Y axis, a fourth position of the piece to be detected rotating by 90 degrees around the X axis after rotating by 90 degrees around the Y axis, and a fifth position of the piece to be detected rotating by 45 degrees around the Y axis after rotating by 90 degrees around the X axis.
7. The method for measuring inertial parameters of automobile parts according to claim 6, wherein said step of calculating the center of mass of said object to be measured in the directions of X-axis, Y-axis and Z-axis respectively according to said pressure values and said spatial distances comprises:
constructing a centroid calculation formula in the X-axis direction:
in the formula:
xcindicating the distance of the centroid of the object to be measured from the reference point along the X-axisxRepresents the distance, P, from the reference point to the center point 0 along the X-axisx1～Px4Respectively representing the pressure values of the four pull pressure sensors (4) when the piece to be detected is at the initial position, and R represents the distance between the sensing end of the pull pressure sensor (4) and the central point O;
in the same way, a mass center calculation formula in the Y-axis and Z-axis directions can be constructed, and the distance Y between the mass center of the to-be-detected piece and the reference point along the Y-axis direction is obtainedcAnd the distance Z between the mass center of the object to be measured and the reference point along the Z-axis directionc。
8. The method for measuring inertial parameters of automobile parts according to claim 7, wherein said step of obtaining the inertia moments of said object to be measured on the X-axis, Y-axis and Z-axis and the products of inertia of the X-Y-axis, X-Z-axis and Y-Z-axis according to said rotation period comprises:
constructing the rotational inertia I of the piece to be measured on the X axisxxThe calculation formula of (2):
in the formula:
Tx is all 2Representing the period of rotation, T, of the rotating disc (2) when the piece to be measured is in the second position0x is equal to 2The rotation period of the rotating disc (2) is shown when the positioning piece is adjusted to enable the to-be-measured piece to be fixed at the second position while the to-be-measured piece is not placed, and K represents the rigidity coefficient of the elastic piece (12);
similarly constructing inertia product I of X-axis and Y-axis of piece to be detectedxyA calculation formula of (A), and a rotational inertia I of the to-be-measured member on the Y axisyyA calculation formula of (1) and an inertia product I of a Y axis and a Z axis of a piece to be measuredyzA calculation formula of (A), and a rotational inertia I of the to-be-measured member on the Z axiszzAnd the inertia product I of the X axis and the Z axis of the piece to be measuredxzRespectively obtaining the inertia product I of the X axis and the Y axis of the piece to be measuredxyThe rotational inertia I of the piece to be measured on the Y axisyyAnd inertia product I of Y-axis-Z-axis of the piece to be measuredyzThe rotational inertia I of the part to be measured on the Z axiszzAnd the inertia product I of the X-Z axis of the piece to be measuredxz。
9. The method for measuring inertial parameters of automobile parts according to claim 8, wherein said step of obtaining the centroid moments of inertia and the centroid products of inertia of the piece under test on the X-axis, the Y-axis and the Z-axis and the centroid products of inertia of the X-axis-Y-axis, the X-axis-Z-axis and the Y-axis-Z-axis, respectively, according to the moment of inertia and the products of inertia comprises:
constructing mass center moment of inertia I of to-be-detected piece in X-axis directionxxcThe calculation formula of (2):
Ixxc＝Ixx-m·xc 2；
wherein m represents the mass of the piece to be measured;
constructing mass center inertia product I of X axis-Y axis of piece to be detectedxycThe calculation formula of (2):
Ixyc＝Ixy-m·(xc 2+xc 2)；
similarly, a mass center moment of inertia I of the part to be measured in the Y-axis direction is establishedyycA mass center moment of inertia I of the workpiece to be measured in the Z-axis directionzzcThe calculation formula of (A) and the mass center inertia product I of the X-Z axis of the piece to be measuredxzcThe calculation formula and the mass center inertia product I of the Y axis-Z axis of the piece to be measuredyzcRespectively obtaining the mass center moment of inertia I of the piece to be measured in the Y-axis directionyycMass center moment of inertia I of to-be-measured piece in Z-axis directionzzcMass center inertia product I of the piece to be measured on X axis-Z axisxzcAnd mass center inertia product I of Y-Z axis of the piece to be measuredyzc。
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| DE10122135A1 (en) * | 2001-05-08 | 2002-11-14 | Voith Paper Patent Gmbh | Process for balancing rotors |
| CN101261171B (en) * | 2008-04-25 | 2010-07-28 | 郑州机械研究所 | Measuring mechanism for measuring object centroid position |
| CN101281075A (en) * | 2008-05-28 | 2008-10-08 | 天津大学 | Large-sized power plant mass inertia characteristic parameters measuring and taking synthetic experimental bench |
| CN101398339B (en) * | 2008-10-23 | 2010-07-07 | 北京星达技术开发公司 | Component quality characteristic integration test equipment and test method |
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