CN117705436A

CN117705436A - Testing device for track longitudinal beam assembly

Info

Publication number: CN117705436A
Application number: CN202311706915.XA
Authority: CN
Inventors: 郭春雷; 吕阳; 徐轲; 陈元锋; 许金州; 李春翔; 李广
Original assignee: Xuzhou Xugong Caterpillar Base Plate Co ltd
Current assignee: Xuzhou Xugong Caterpillar Base Plate Co ltd
Priority date: 2023-12-12
Filing date: 2023-12-12
Publication date: 2024-03-15

Abstract

The invention relates to a testing device for a track rail assembly, comprising: a base; a central shaft fixed to the base, the central shaft extending in a vertical direction perpendicular to the base; a rail mount rotatably mounted about the central axis and extendable and retractable in a longitudinal direction and a transverse direction perpendicular to the vertical direction and perpendicular to each other, the rail mount being configured for connection to a track rail assembly on both sides in the transverse direction, respectively; a bracket fixed to the base; at least one loading device mounted to the bracket and configured to apply a load to the rail mount in a vertical direction and toward the base. By the testing device, the states of the track girder assembly under various motion states and various loading conditions can be conveniently simulated, so that the testing of the performance of the track girder assembly can be facilitated.

Description

Testing device for track longitudinal beam assembly

Technical Field

The invention relates to the field of engineering machinery, in particular to a testing device for a track longitudinal beam assembly.

Background

The crawler longitudinal beam assembly is taken as an important component of the chassis and can be matched with a frame or independently bear the upper main machine of various engineering machines. A track rail assembly may be used to carry an upper vehicle host of various configurations. Because the parameters such as the weight, the system pressure setting, the flow setting and the like of various host vehicles on the bus are different, the requirements on the running speed, the turning capacity, the climbing capacity and the like are also different. Therefore, after the same track longitudinal beam assembly is put on the market, the track longitudinal beam assembly can be normally used for some types of boarding hosts, and various adverse phenomena, such as abnormal driving noise, abnormal abrasion, tooth jump of driving wheels, insufficient driving power, deformation of structural members and the like, can occur for other types of boarding hosts.

In order to avoid the above-mentioned drawbacks as much as possible, it is necessary to perform various tests on the track rail assembly before it is put on the market, to find out the design defects as early as possible and to make corresponding corrections. In the testing process, if the real-time running-in test is carried out by matching with a real-time matched upper car owner, the cost and the testing period are high, which is not desirable.

Disclosure of Invention

It is therefore an object of the present invention to provide a testing device for a track rail assembly which can simulate the loading conditions of the track rail assembly in several movement states, so that the testing of the track rail assembly can be carried out in a relatively time and cost efficient manner, in order to be able to find design defects as early as possible.

To this end, the present invention provides a testing device for a track rail assembly, the testing device comprising:

a base;

a central shaft fixed to the base, the central shaft extending in a vertical direction perpendicular to the base;

a rail mounting bracket rotatably mounted around the central axis and having a longitudinal direction and a lateral direction perpendicular to the vertical direction and perpendicular to each other, the rail mounting bracket being configured to be connected to a track rail assembly on both sides in the lateral direction, respectively, and including first and second mounting portions for connection to the track rail assembly on both sides in the lateral direction, respectively, a distance between the first and second mounting portions in the lateral direction being adjustable;

a bracket fixed to the base;

at least one loading device mounted to the bracket and configured to apply a load to the rail mount in a vertical direction and toward the base.

By the testing device, the states of the track girder assembly under various motion states and various loading conditions can be conveniently simulated, so that the testing of the performance of the track girder assembly can be facilitated.

In some embodiments, the first mounting portion and the second mounting portion each include at least two connection portions arranged at intervals in the longitudinal direction, and a distance in the longitudinal direction between each two connection portions located on the same side in the lateral direction is adjustable.

In some embodiments, the rail mount includes a middle beam extending in a longitudinal direction and at least one transverse beam extending in a transverse direction, the transverse beams being mounted to the middle beam, and each transverse beam including a main body portion and two telescoping portions positioned on both sides of the main body portion in the transverse direction and being extendable and retractable in the transverse direction relative to the main body portion.

In some embodiments, the stringer mount includes at least two transverse beams, and a spacing between any two transverse beams in the longitudinal direction is adjustable.

In some embodiments, the central axis corresponds to a central position in a longitudinal direction of the track rail assembly when the track rail assembly is connected to the rail mount.

In some embodiments, the loading device is configured as a hydraulic ram and is capable of applying a hydraulic load to the rail mount in a vertical direction and toward the base.

In some embodiments, the testing device includes at least one loading device positioned at a central location in a longitudinal direction corresponding to the track rail assembly.

In some embodiments, the bracket includes a longitudinal beam extending in a longitudinal direction and a vertical beam extending in a vertical direction and configured to support the longitudinal beam, the loading device being mounted to the longitudinal beam.

In some embodiments, the test device comprises a plurality of loading devices arranged along the extension direction of the longitudinal beam.

In some embodiments, the testing device includes a first swivel member extending downward in a vertical direction from the longitudinal beam and coaxially disposed with the central shaft, and a second swivel member coaxially mated with the first swivel member, the second swivel member being fixedly mounted to the stringer mount such that the stringer mount is rotatable about an axis of the central shaft relative to the first swivel member via the second swivel member.

In some embodiments, the test device comprises two loading devices disposed at symmetrical positions on both sides in the longitudinal direction of the first swivel member, the two loading devices being positioned adjacent to the first swivel member.

In some embodiments, the testing device includes a carrier fixedly mounted to the stringer mount above and configured to be disposed about the first swivel member, the carrier further configured to carry a load from the loading device.

In some embodiments, the test device includes two loading devices positioned at respective ends corresponding to a longitudinal direction of the track rail assembly.

In some embodiments, the testing device includes a rotational loading device mounted to the base, the rotational loading device including a resistance application portion and a transmission mechanism connected to the resistance application portion and the stringer mount, and configured to apply resistance to the stringer mount in a direction in which the stringer mount rotates about the central axis through the transmission mechanism.

In some embodiments, the transmission mechanism is configured as a gear transmission mechanism including a first gear and a second gear meshed with each other, the first gear being connected to the resistance applying portion, the second gear being connected to the stringer mounting bracket and rotatable about the central axis.

In some embodiments, the test device includes a connecting member configured to secure the stringer mount to the bracket.

In some embodiments, the testing device includes one or more rolling dynamometers configured for placement under the track rail assembly to be tested.

In some embodiments, the testing device includes a detection device configured to detect one or more of a temperature at a particular location of the track rail assembly, a stress and/or strain at a particular location of the track rail assembly, a rotational speed of a speed reducer of the track rail assembly, and a rotational speed of the track rail assembly about a central axis.

The above-mentioned individual features and the individual features to be mentioned below and the features which can be derived from the drawing can be combined with one another at will, as long as the individual features combined with one another are not mutually contradictory.

Drawings

The invention will be described in more detail below by way of exemplary embodiments with reference to the accompanying drawings, to which the invention is not limited. Wherein:

FIG. 1 illustrates a schematic perspective view of a track rail assembly.

Fig. 2 illustrates a schematic perspective view of a testing device for a track rail assembly, according to some embodiments of the invention.

Fig. 3 shows a schematic perspective view of a stringer mount of the test apparatus for the track stringer assembly of fig. 2.

Fig. 4 shows a schematic perspective view of the test device for the track rail assembly of fig. 2 when testing for straight running conditions of the track rail assembly.

FIG. 5 illustrates a schematic perspective view of the testing device for the track rail assembly of FIG. 2 when tested for in-situ turning conditions of the track rail assembly.

Detailed Description

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

Fig. 1 shows a schematic perspective view of a track rail assembly 1. Typically, the track rail assembly 1 may include tracks 2, rail frames 3, a travel motor assembly 4 (including hydraulic motors and speed reducers), guide wheels 5, thrust wheels 6, a drag chain plate 7, and the like. Typically, a mobile device contains two track rail assemblies 1 that are side-to-side, and straight running and in-situ turning of track rail assemblies 1 are the two most common motion states. Accordingly, the testing device 10 of the present invention is intended to test the track rail assembly 1 for load carrying capacity and travel speed in both of these two conditions of movement to evaluate whether the requirements are met.

As shown in fig. 2, a test device 10 for a track rail assembly 1 according to some embodiments of the present invention may include a base 11, which base 11 may be a generally planar member that is tiled in a horizontal plane, and may be configured to have a certain roughness to simulate a ground attachment force. The testing device 10 may further comprise a central shaft 12 fixed to the base 11, which central shaft 12 may be arranged to extend in the vertical direction z perpendicular to the base 11. The central shaft 12 may for example be a solid cylindrical shaft and may for example be welded to the base 11 to ensure its stability.

The test device 10 may further include a stringer mount 13 rotatably mounted about the central axis 12. As shown in fig. 3, the rail mounting bracket 13 may include a longitudinal direction a and a lateral direction b perpendicular to the vertical direction z and to each other, and may be configured to be connected to one track rail assembly 1 at both sides of the lateral direction b of the rail mounting bracket 13, respectively, to simulate the form of a chassis frame mounted on an upper body. It should be appreciated that the longitudinal direction a of the rail mount 13 may correspond to the longitudinal direction of the track rail assembly 1 and the lateral direction b of the rail mount may correspond to the lateral direction of the track rail assembly 1. Advantageously, when the track rail assembly 1 is connected to the rail mounting bracket 13, the position of the central axis 12 corresponds to the central position in the longitudinal direction of the track rail assembly 1 to simulate the situation where the upper vehicle main unit is located at the central position in the longitudinal direction of the track rail assembly 1 relative to the rotational axis of the track rail assembly 1, which is in line with the relative mounting positions typically employed for the upper vehicle main unit and the track rail assembly 1.

As shown in fig. 3, the rail mount 13 may include a middle beam 31 extending in a longitudinal direction a thereof, and two lateral beams 32 mounted near both ends of the middle beam 31 in the longitudinal direction a, respectively, and the lateral beams 32 may extend in a lateral direction b and may be configured for connection to the track rail assembly 1 at the ends thereof in the lateral direction. In other words, the end of one side in the lateral direction b of each lateral beam 32 may be used together as a first mount for connection to one track rail assembly 1, and the end of the other side in the lateral direction b of each lateral beam 32 may be used together as a second mount for connection to the other track rail assembly 1. The first and second attachment portions may each comprise a plurality of attachment portions for attachment to the track rail assembly 1, and it is advantageous that the distance in the longitudinal direction between each two attachment portions on the same side in the transverse direction is adjustable. As shown in fig. 3, the intermediate beam 31 may be configured as an i-beam, for example. It should be understood that in other embodiments not shown, the transverse beams 32 may be mounted to the intermediate beams 31 at other locations, respectively, than at the end locations, and that the number of transverse beams 32 may be not two, but one, three, or more. By varying the position of each transverse beam 32 in the longitudinal direction a mounted to the track rail assembly 1, the rail mounting bracket 13 may be made to readily accommodate track rail assemblies 1 having different longitudinal dimensions.

As shown in fig. 3, each transverse beam 32 may include a main body portion 33 and two telescoping portions 34, the main body portion 33 being configured to receive the telescoping portions 34, the telescoping portions 34 being configured to be coupled to the track rail assembly 1. The telescoping portion 34 can be extended and retracted in the lateral direction b with respect to the main body portion 33, so that the length of the lateral beam 32 in the lateral direction b can be adjusted, thereby adjusting the pitch of the track rail assemblies 1 connected to both sides in the lateral direction b of the rail mounting bracket 13 in the lateral direction b to simulate a pair of track rail assemblies 1 having different lateral pitches. For example, the body portion 33 may include locating holes 37, and the position of the telescoping portion 34 relative to the body portion 33 may be determined by inserting locating pins 38 in the locating holes 37 and through corresponding locating holes (not shown) in the telescoping portion 34.

The mounting position of the transverse beam 32 in relation to the intermediate beam 31 in the longitudinal direction a is adjustable. For example, the intermediate beam 31 may comprise a plurality of holes 36 arranged in the longitudinal direction a, and the transverse beam 32 may be connected to the holes 36 in the intermediate beam 31 by bolts 35. By varying the hole 36 with which the transverse beam 32 engages, the mounting position of the transverse beam 32 in relation to the intermediate beam 31 in the longitudinal direction a can be adjusted. It will be appreciated that in other embodiments not shown, the intermediate beam 31 may also be configured with a main body portion and a telescoping portion like the transverse beam 32, and that the transverse beam 32 may be mounted to the telescoping portion, such that the position of the transverse beam 32 mounted to the track rail assembly 1 in the longitudinal direction a may be adjusted by adjusting the position of the telescoping portion relative to the main body portion.

As shown in fig. 2, the testing device 10 may further include a bracket 14 secured to the base 11 and at least one loading device 15 mounted to the bracket 14, the loading device 15 may be configured to apply a load to the rail mount 13 in a vertical direction z and toward the base 11 to simulate the conditions when the track rail assembly 1 is loaded at the location of the loading location 15. The loading device 15 may be configured, for example, as a hydraulic ram and is capable of applying a hydraulic load to the rail mounting 13 in the vertical direction z and toward the base 11. Different load sizes can be simulated by adjusting the pressure of the hydraulic cylinder.

As shown in fig. 2, the testing device 10 may include a power module 26 to power the track rail assembly 1 and/or the loading device 15. Advantageously, the test device 10 may provide adjustable power.

As further shown in fig. 2, the rack 14 may include a longitudinal beam 16 extending in the longitudinal direction x of the test device 10 and a vertical beam 17 extending in the vertical direction z and configured to support the longitudinal beam 16, and the loading device 15 may be mounted to the longitudinal beam 16. When the rail mounting bracket 13 is in a state for testing the straight running condition of the track rail assembly 1, the longitudinal direction x of the testing device 10 may correspond to the longitudinal direction a of the rail mounting bracket.

Advantageously, the testing device 10 may comprise a first swivel member 18 extending downwards from the longitudinal beam 16 in the vertical direction z and arranged coaxially with the central shaft 12, and a second swivel member (not shown) co-axially cooperating with the first swivel member 18. The second swivel member may be fixedly mounted to the stringer mounting bracket 13, for example by means of bolts, which enable the stringer mounting bracket 13 to be turned about the axis of the central shaft 12 relative to the first swivel member 18 via the second swivel member, so as to be rotatably connected to the bracket 14. For example, the first swivel member 18 may be configured as a bushing and the second swivel member may be configured as a pin mounted within the bushing.

Advantageously, as shown in fig. 2, the test device 10 may further comprise a carrier 25, which carrier 25 may be fixedly mounted, for example by bolts, above the stringer mounting bracket 13 and may be configured, for example, to be arranged around the first swivel member 18 so as to be able to act as a member of the stringer mounting bracket 13 for carrying the load from the loading device 15. It should be appreciated that the testing device 10 may comprise a plurality of carriers 25 corresponding to the position of the respective loading device 15.

As shown in fig. 2, the testing device 10 may include a plurality of loading devices 15 arranged along the extension direction of the longitudinal beams 16 to simulate the loading conditions at various locations of the track rail assembly 1 in the longitudinal direction. For example, the testing device 10 may include at least one loading device 15 positioned at a central location in the longitudinal direction corresponding to the track rail assembly 1 to simulate a loading condition at the central location in the longitudinal direction of the track rail assembly 1. In case the testing device 10 comprises a first swivel member 18, the testing device 10 may comprise two loading devices 15 arranged at symmetrical positions on both sides of the first swivel member 18 in the longitudinal direction, which two loading devices 15 may be positioned adjacent to the first swivel member 18. For example, the test device 10 may include two loading devices 15 positioned at positions corresponding to both ends of the track rail assembly 1 in the longitudinal direction so as to simulate a condition in which the track rail assembly 1 is loaded at either one or both ends in the longitudinal direction, for example, a condition in which one or the other end of the track rail assembly 1 is landed.

As shown in fig. 4, in some embodiments, the testing device 10 may include one or more rolling dynamometers 27, which rolling dynamometers 27 may be configured for placement underneath the track rail assembly 1 to be tested to simulate the drag applied by the ground to the track rail assembly 1.

As shown in fig. 4, in some embodiments, the testing device 10 may further include a connecting member 19 configured to secure the stringer mount 13 to the bracket 14, thereby preventing rotation of the stringer mount 13 relative to the central shaft 12 during testing for straight running conditions of the track stringer assembly 1.

As shown more clearly in fig. 2 and 5, in some embodiments, the test device 10 may include a rotational loading device 20 mounted to the base 11. The rotational loading device 20 may include a resistance applying portion 21 and a transmission mechanism 22 connected to the resistance applying portion 21 and the rail mounting bracket 13. The rotational loading device 20 may be configured to apply a fixed or variable amount of resistance to the stringer mount 13 in a direction of rotation of the stringer mount 13 about the central axis 12 via the transmission 22 to simulate the resistance experienced by the track stringer assembly 1 during in-situ cornering conditions. The transmission mechanism 22 may be configured as a gear transmission mechanism, for example, and includes a first gear 23 and a second gear 24 that mesh with each other, wherein the first gear 23 may be connected to the resistance applying portion 21, and the second gear 24 may be connected to the stringer mounting bracket 13 and rotatable about the center axis 12.

To achieve performance of the track rail assembly 1 under various conditions, the testing device 10 may also include a corresponding detection device (not shown).

For example, the detection device may include a temperature detection device that may be configured to measure and record the temperature of critical parts such as the driving wheel, the guiding wheel 5, the sprocket and the thrust wheel 6 of the track rail assembly 1 at regular intervals. The temperature detection device may be, for example, a wireless temperature measurement sensor, a temperature measurement gun, or the like. Advantageously, a wireless temperature sensor may be installed at a key point of the track rail assembly 1, which may be connected to a corresponding signal receiver, so that the signal receiver may feed back the measured temperature in real time. Advantageously, the temperature detection means may be provided with a high temperature alarm means to alert when the temperature measured by the wireless temperature sensor exceeds a certain threshold. For example, when the measured temperature exceeds a certain threshold, it is indicated that there may be abnormal wear in the corresponding portion of the track rail assembly 1. The temperature detection for each position of the track rail assembly 1 can be performed after the shutdown, and at the same time, the surface of each component of the track rail assembly 1 can be checked for abnormal wear and oil leakage of the wheel body.

For example, the detection device may include a wireless strain-stress detection device that may be configured to measure dynamic strain and stress at a particular location of the track rail assembly 1. The wireless strain stress detection device may include, for example, a resistive strain gauge, a resistive voltage adapter, a signal amplifier, a resistive strain gauge, a computer, test software, and the like. For example, strain gages may be affixed to the track rail assembly 1 at key points and the data measured by the strain gages read by a corresponding controller. For example, when the measured stress and/or strain exceeds a certain threshold, it is indicated that the track rail assembly 1 may be overloaded.

For example, the detection means may further comprise speed detection means for detecting the rotational speed of the speed reducer of the track rail assembly 1 and the rotational speed of the track rail assembly 1 about the central axis 12 during in-situ cornering conditions, and/or for detecting the rotational speed of the speed reducer of the track rail assembly 1 during straight-line driving conditions. For example, an encoder may be fixed to the track rail assembly 1 and may be rotated by a speed reducer to detect the rotational speed of the speed reducer of the track rail assembly 1. For example, an encoder may be fixed to the rotational loading device 20 and may be rotated by the first gear 23 to detect the rotational speed of the track rail assembly 1 about the central axis 12. For example, when the measured speed of the speed reducer and/or the rotational speed of the track rail assembly 1 about the central axis 12 is less than the respective threshold values, it is indicated that the track rail assembly 1 may have an under-powered problem.

By means of the testing device 10 according to the invention, the state of the track rail assembly 1 in a plurality of movement states and under a plurality of loading conditions can be simulated in a convenient manner, so that the performance of the track rail assembly 1 can be tested in a time-and cost-efficient manner.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

For convenience of description, the words "upper", "lower", "left" and "right" in the present invention, if they mean only that the directions are consistent with the upper, lower, left, and right directions of the drawings per se, and do not limit the structure, only for convenience of description and simplification of the description, but do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

It is noted that the terminology used herein is for the purpose of describing particular aspects only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be understood that the terms "comprises" and "comprising," and other similar terms, when used in this specification, specify the presence of stated operations, elements, and/or components, but do not preclude the presence or addition of one or more other operations, elements, components, and/or groups thereof. The term "and/or" as used herein includes all arbitrary combinations of one or more of the associated listed items. In the description of the drawings, like reference numerals always denote like elements.

Finally, it is pointed out that the above embodiments are only intended to understand the invention and do not limit the scope of protection thereof. Modifications to the above would be obvious to those of ordinary skill in the art, but would not bring the invention so modified beyond the scope of the present invention.

Claims

1. A testing device for a track rail assembly, the testing device comprising:

a base;

a bracket fixed to the base;

2. The test device according to claim 1, wherein the first mounting portion and the second mounting portion each include at least two connecting portions arranged at intervals in a longitudinal direction, and a distance in the longitudinal direction between each two connecting portions located on the same side in a lateral direction is adjustable.

3. The test device of claim 1, wherein the stringer mount includes a middle beam extending in a longitudinal direction and at least one transverse beam extending in a transverse direction, the transverse beams being mounted to the middle beam, and each transverse beam including a main body portion and two telescoping portions positioned on both sides of the main body portion in the transverse direction and extendable and retractable in the transverse direction relative to the main body portion.

4. A testing device according to claim 3, wherein the stringer mounting bracket comprises at least two transverse beams and the spacing between any two transverse beams in the longitudinal direction is adjustable.

5. The test device of claim 1, wherein the central axis corresponds to a central position in a longitudinal direction of the track rail assembly when the track rail assembly is connected to the rail mounting bracket.

6. The test device of claim 1, wherein the loading device is configured as a hydraulic ram and is capable of applying a hydraulic load to the stringer mount in a vertical direction and toward the base.

7. The test device of claim 1, wherein the test device comprises at least one loading device positioned at a central location in a longitudinal direction corresponding to the track rail assembly.

8. The test device of claim 1, wherein the rack comprises a longitudinal beam extending in a longitudinal direction and a vertical beam extending in a vertical direction and configured to support the longitudinal beam, the loading device being mounted to the longitudinal beam.

9. The test device of claim 8, wherein the test device comprises a plurality of loading devices arranged along the extension of the longitudinal beam.

10. The test device of claim 8, comprising a first swivel member extending downwardly from the longitudinal beam in a vertical direction and coaxially disposed with the central axis, and a second swivel member coaxially mated with the first swivel member, the second swivel member fixedly mounted to the stringer mount such that the stringer mount is rotatable about an axis of the central axis relative to the first swivel member via the second swivel member.

11. The test device according to claim 10, characterized in that the test device comprises two loading devices arranged at symmetrical positions on both sides in the longitudinal direction of the first swivel member, which are positioned adjacent to the first swivel member.

12. The test device of claim 10, comprising a carrier fixedly mounted above the stringer mount and configured to be disposed about the first swivel member, the carrier further configured to carry a load from the loading device.

13. The test device of claim 1, comprising two loading devices positioned at respective ends corresponding to a longitudinal direction of the track rail assembly.

14. The test device of claim 1, comprising a rotational loading device mounted to the base, the rotational loading device comprising a resistance application portion and a transmission mechanism coupled to the resistance application portion and the stringer mount, and configured to apply resistance to the stringer mount in a direction in which the stringer mount rotates about the central axis through the transmission mechanism.

15. The test device of claim 14, wherein the transmission mechanism is configured as a gear transmission mechanism including a first gear and a second gear meshed with each other, the first gear being connected to the resistance application portion, the second gear being connected to the stringer mounting bracket and rotatable about the central axis.

16. The test device of claim 1, wherein the test device includes a connecting member configured to secure the stringer mount to the bracket.

17. The test device of claim 1, wherein the test device comprises one or more rolling dynamometers configured for placement under a track stringer assembly to be tested.

18. The test device of claim 1, comprising a detection device configured to detect one or more of a temperature at a particular location of the track rail assembly, a stress and/or strain at a particular location of the track rail assembly, a rotational speed of a speed reducer of the track rail assembly, and a rotational speed of the track rail assembly about a central axis.