JP2010243471A - Device and method for measuring coefficient of dynamic friction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for measuring a coefficient of dynamic friction by pulling a linear object such as a communication cable at an actual traction speed or a withdrawal speed or a greater speed. <P>SOLUTION: The device for measuring the coefficient of the dynamic friction of a linear object includes a linear object fixing means to fix an end of the linear object, a mounting guide to mount the linear object, a movable mount capable of moving on an installation surface, a loading guide being in contact with contact the linear object facing the mounting guide on the movable mount, a loading means to load to the linear object via the loading guide, and a pulling means to pull the movable mount at a fixed traction force in the direction opposite to the linear object fixing means, in which the contacting surface between the mounting guide and the loading guide is flat. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an apparatus and method for measuring a dynamic friction coefficient of a linear object.

  A standard measurement method has been established as a method for testing the dynamic friction coefficient of plastic films and sheets (for example, see Non-Patent Document 1). JIS 7125: 1999 stipulates a method of measuring a friction coefficient at the time of sliding and sliding when a film-like or sheet-like material is slid on the same material or another material.

In this method, the friction coefficient of a non-sticky plastic film or sheet up to an upper limit thickness of 0.5 mm is measured. For example, a plastic film or sheet requires a square with a contact area of 40 cm ² , and the tensile speed for causing friction is normally defined as 100 mm / min ± 10 mm / min.

JIS 7125: 1999 “Plastic film and sheet-Dynamic friction coefficient test method”

  However, it is difficult to apply the above measurement method to the measurement of the dynamic friction coefficient of a linear object such as a communication cable. That is, it has been clarified that there is a large difference in the coefficient of dynamic friction because the shape is greatly different between a rectangle such as a plastic film or sheet and a linear object such as a communication cable. In addition, there is a difference of about two digits between the pulling speed determined by the standard measurement method and the pulling speed or pulling speed of the communication cable, so the measurement did not reflect the actual situation.

  In order to solve the above-mentioned problems, the present invention provides a speed at or above an actual pulling speed or pulling speed in the same environment as in a pipeline for actually pulling or pulling a linear object such as a communication cable. It is an object of the present invention to provide an apparatus and a method for measuring a dynamic friction coefficient by pulling on a wire.

  To achieve the above object, one end of a linear object is fixed, and a dynamic friction coefficient is calculated by pulling a movable base having a guide with a constant traction force while applying a load to the linear object through the guide. It was decided.

  Specifically, the dynamic friction coefficient measuring device of the present invention is a dynamic friction coefficient measuring device for measuring a dynamic friction coefficient of a linear object, and includes a linear object fixing means for fixing one end of the linear object, and the linear object. A movable table having a mounting guide for mounting an object, movable on the installation surface, and a load guide for contacting the linear object facing the mounting guide of the movable table, and through the load guide Load means for loading the linear object, and traction means for pulling the movable base with a constant traction force in a direction opposite to the linear object fixing means, the linear guides of the mounting guide and the load guide. The contact surface with the object is characterized by a flat shape.

  According to this configuration, a linear object such as a communication cable having a quadrilateral cross section is pulled at the actual pulling speed or the pulling speed in the same environment as in the pipe for actually pulling or pulling out. The coefficient of dynamic friction can be measured.

  Further, in the dynamic friction coefficient measuring apparatus according to the present invention, the traction means pulls the movable base by a predetermined distance with a constant traction force, and the movable base stops after pulling the movable base by the predetermined distance. It further comprises stop distance measuring means for measuring the stop distance until.

  According to this configuration, the dynamic friction coefficient can be calculated from the stop distance until the movable table stops without calculating the frictional force.

  Furthermore, the dynamic friction coefficient measuring device of the present invention is configured such that the movable base is pulled by the predetermined distance while holding the linear object between the mounting guide and the load guide measured by the stop distance measuring means. The apparatus further includes dynamic friction coefficient calculating means for calculating a dynamic friction coefficient of the linear object from a mounting stop distance that is a stop distance until the base stops.

  According to this configuration, the dynamic friction coefficient of the linear object can be calculated from the mounting stop distance.

  Furthermore, the dynamic friction coefficient measuring device of the present invention is configured such that the movable base is pulled by the predetermined distance while holding the linear object between the mounting guide and the load guide measured by the stop distance measuring means. A dynamic friction coefficient calculating means for calculating a dynamic friction coefficient of the linear object from a mounting stop distance that is a stop distance until the base stops and a dynamic friction coefficient between the movable base and the installation surface when the linear object is not mounted; It is further provided with the feature.

  According to this configuration, even if there is a dynamic friction force between the movable table and the installation surface, the dynamic friction coefficient of the linear object can be calculated.

  Further, the dynamic friction coefficient measuring apparatus of the present invention is a stop distance until the movable base stops after the dynamic friction coefficient calculation means pulls the movable base by a predetermined distance without mounting the linear object. A dynamic friction coefficient between the movable table and the installation surface is calculated from a load stop distance.

  By measuring the no-load stop distance, the dynamic friction coefficient between the movable platform and the installation surface can be calculated.

  Further, the dynamic friction coefficient measuring device of the present invention is a stop time until the movable base stops after the dynamic friction coefficient calculation means pulls the movable base by a predetermined distance without mounting the linear object. A dynamic friction coefficient between the movable table and the installation surface is calculated from a load stop time.

  By measuring the no-load stop time, the dynamic friction coefficient between the movable table and the installation surface can be calculated.

  Furthermore, the dynamic friction coefficient measuring apparatus of the present invention is a movement time from when the dynamic friction coefficient calculating means starts to pull the movable table without mounting the linear object until the movable table moves by a predetermined distance. A dynamic friction coefficient between the movable table and the installation surface is calculated from a no-load movement time.

  By measuring the no-load moving time, the dynamic friction coefficient between the movable table and the installation surface can be calculated.

  Furthermore, the dynamic friction coefficient measuring apparatus of the present invention holds the linear object fixing means, and the force applied to the linear object fixing means via the linear object while the traction means pulls the movable table. It is further characterized by further comprising a stress measuring means for measuring.

  According to this configuration, the dynamic friction coefficient of the linear object can be measured from the force applied to the linear object fixing means.

  Furthermore, the dynamic friction coefficient measuring apparatus of the present invention further includes dynamic friction coefficient calculating means for calculating the dynamic friction coefficient of the linear object from the force measured by the stress measuring means.

  According to this configuration, the dynamic friction coefficient of the linear object can be calculated from the force applied to the linear object fixing means.

  Furthermore, the dynamic friction coefficient measuring apparatus of the present invention is characterized in that the traction means has a weight that pulls the movable table and falls from the same height as the predetermined distance.

  According to this configuration, the actual pulling speed or pulling speed can be realized by adjusting the mass of the falling weight or the dropping height.

  Furthermore, the dynamic friction coefficient measuring apparatus of the present invention is characterized in that the pulling means has a weight that pulls and drops the movable table.

  According to this configuration, the actual pulling speed or pulling speed can be realized by adjusting the mass of the falling weight.

  Furthermore, the dynamic friction coefficient measuring device of the present invention is characterized in that the contact surfaces of the mounting guide and the load guide with the linear object are made of the same material as the surface of the linear object.

  According to this configuration, the dynamic friction coefficient of the linear object normalized by the material of the surface of the linear object can be measured.

  Furthermore, the dynamic friction coefficient measuring method of the present invention is a dynamic friction coefficient measuring method for measuring the dynamic friction coefficient of a linear object, wherein one end of the linear object is fixed, the linear object is mounted, and the linear object and A mounting base having a flat contact surface shape, a movable base movable on the installation surface, the linear object is accommodated facing the mounting guide of the movable base, and the linear object A load guide having a flat contact surface shape, and a load means for loading the linear object with the load guide, and a constant traction force in the direction of the other end of the linear object while sandwiching the linear object The linear object is obtained by pulling the movable base by a predetermined distance and measuring a mounting stop distance that is a stop distance from the time when the movable base is pulled by the predetermined distance until the movable base stops. It is characterized by measuring the coefficient of dynamic friction.

  According to this method, a linear object such as a communication cable having a quadrilateral cross section is pulled at the actual pulling speed or the pulling speed in the same environment as that in the pipeline for the actual pulling or pulling out. The coefficient of dynamic friction can be measured. Further, the dynamic friction coefficient can be measured from the mounting stop distance until the movable table stops without measuring the frictional force.

  In the dynamic friction coefficient measuring method of the present invention, the dynamic friction coefficient of the linear object is calculated from the mounting stop distance and the dynamic friction coefficient between the movable table and the installation surface when the linear object is not mounted. To do.

  According to this configuration, even if there is a dynamic friction force between the movable table and the installation surface, the dynamic friction coefficient of the linear object can be calculated.

  In the dynamic friction coefficient measuring method of the present invention, the dynamic friction coefficient between the movable base and the installation surface when the linear object is not mounted is determined by pulling the movable base by a predetermined distance without mounting the linear object. It is calculated by measuring a no-load stop distance that is a stop distance until the movable platform stops.

  By measuring the no-load stop distance, the dynamic friction coefficient between the movable platform and the installation surface can be calculated.

  In the dynamic friction coefficient measuring method of the present invention, the dynamic friction coefficient between the movable base and the installation surface when the linear object is not mounted is determined by pulling the movable base by a predetermined distance without mounting the linear object. It is calculated by measuring a no-load stop time that is a stop time until the movable platform stops.

  By measuring the no-load stop time, the dynamic friction coefficient between the movable table and the installation surface can be calculated.

  In the dynamic friction coefficient measuring method of the present invention, the dynamic friction coefficient between the movable base and the installation surface when the linear object is not mounted is the movable base for a predetermined distance with a constant traction force without mounting the linear object. It is calculated by measuring a no-load moving time, which is a moving time from when the movable table starts to be pulled to when the movable table moves by a predetermined distance.

  By measuring the no-load moving time, the dynamic friction coefficient between the movable table and the installation surface can be calculated.

  Furthermore, the dynamic friction coefficient measuring method of the present invention is characterized in that the movable table is pulled by a predetermined distance with a constant traction force by dropping a weight for pulling the movable table from the same height as the predetermined distance. And

  According to this method, the actual pulling speed or pulling speed can be realized by adjusting the weight of the falling weight or the dropping height.

  Furthermore, the dynamic friction coefficient measuring method of the present invention is a dynamic friction coefficient measuring method for measuring the dynamic friction coefficient of a linear object, wherein the linear object is mounted while holding one end of the linear object, and the linear object And a movable base movable on the installation surface, the linear object is accommodated facing the mounting guide of the movable base, and the linear object The contact surface has a flat load guide, and a load means for loading the linear object with the load guide is fixed in the direction of the other end of the linear object while sandwiching the linear object. The dynamic friction coefficient of the linear object is measured by pulling the movable base by a predetermined distance with a pulling force, and measuring the force applied as a tensile force to the linear object while the pulling means pulls the movable base. Is measured.

  According to this method, a dynamic friction coefficient is measured by pulling a linear object such as a communication cable having a quadrilateral cross section at the actual pulling speed or pulling speed in the same environment as the inside of the pipe for actually pulling or pulling. be able to. Moreover, it is computable from the force applied as a tensile force to a linear thing.

  Furthermore, the dynamic friction coefficient measuring method of the present invention is characterized in that the movable table is pulled with a constant traction force by dropping a weight that pulls the movable table.

  According to this method, the actual pulling speed or pulling speed can be realized by adjusting the mass of the falling weight.

  Furthermore, the dynamic friction coefficient measuring method of the present invention is characterized in that the material of the contact surface of the mounting guide and the load guide with the linear object is the same as the material of the surface of the linear object.

  According to this configuration, the dynamic friction coefficient of the linear object normalized by the material of the surface of the linear object can be measured.

  According to the present invention, a dynamic friction coefficient is measured by pulling a linear object such as a communication cable having a quadrilateral cross section at the actual pulling speed or pulling speed in the same environment as the inside of the pipe line where the actual pulling or pulling is performed. A dynamic friction coefficient measuring apparatus can be provided.

It is a figure which shows the cut surface of the movable stand and load means of the dynamic friction coefficient measuring apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the dynamic friction coefficient measuring apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the dynamic friction coefficient measuring apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the dynamic friction coefficient measuring apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the dynamic friction coefficient measuring apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the dynamic friction coefficient measuring apparatus which concerns on embodiment of this invention.

  Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments. In the present specification and drawings, the same reference numerals denote the same components.

(First embodiment)
A configuration of a dynamic friction coefficient measuring apparatus according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a cutaway view of the movable table 14 and the load means 15 on which the cable 12 is mounted. In FIG. 1, 11 is an installation surface, 12 is a cable as a linear object, 14 is a movable base movable on the installation surface 11, 15 is a load means for loading the cable 12, 14a is a mounting guide, and 15a is a load guide. , 19 are weighting means fixed guides.

  The movable table 14 has a mounting guide 14 a for mounting the cable 12, and is movable on the installation surface 11. The load means 15 has a load guide 15a that faces the mounting guide 14a and contacts the cable 12, and loads the cable 12 via the load guide 15a. The weighting means fixing guide 19 is fixed to the side surface of the movable table 14 and serves as a guide for fixing the loading means 15.

  The contact surfaces of the mounting guide 14a and the load guide 15a with the cable 12 are preferably flat. By making the contact surfaces of the mounting guide 14a and the load guide 15a into such a shape, the mounting guide 14a and the load guide 15a can cause dynamic friction to be evenly generated on the surface of the cable 12. When multiple quadrilateral cables with a rectangular or square cross section are laid in the pipeline, dynamic friction is performed in the same environment as in the pipeline where one cable is pulled or pulled out. The coefficient can be measured.

  The material of the contact surface of the mounting guide 14a and the load guide 15a with the cable 12 is preferably the same as the material of the surface of the cable 12. If the same material is used, the dynamic friction coefficient can be normalized by measuring the dynamic friction coefficient between the same materials. For example, a plurality of cables having a quadrilateral cross section to be measured may be arranged in the radial direction to form the mounting guide 14a or the load guide 15a.

  The configuration of the dynamic friction coefficient measuring apparatus shown in FIG. 1 is common to the following embodiments.

  The first embodiment of the present invention is a case where the movable base can move on the installation surface with a dynamic friction force sufficiently smaller than the dynamic friction force between the linear object and the mounting guide or the load guide. The configuration of the dynamic friction coefficient measuring apparatus according to the first embodiment of the present invention will be described with reference to FIG. In FIG. 2, 11 is an installation surface, 12 is a cable as a linear object, 13 is a linear object fixing means for fixing one end of the cable 12, 14 is a movable base movable on the installation surface 11, and 15 is a cable 12 A load means 16 for loading the cable 12 is a weight as a traction means for pulling the movable base 14 by a predetermined distance with a constant traction force in a direction opposite to the linear object fixing means 13, and 17 is a weight 16 from the height H. It is a buffer stand that receives when it falls.

In the present embodiment, as shown in FIG. 2, with the cable 12 mounted, a mounting stop distance x that is a stop distance until the movable base 14 stops after the movable base 14 is pulled by a predetermined distance with a constant traction force. _s is measured. Based on the measured mounting stop distance x _s , the dynamic friction coefficient μ ₁ between the movable table 14 or the load means 15 and the cable 12 is measured.

  The installation surface 11 desirably has a dynamic friction force smaller than the dynamic friction force between the cable 12 and the movable table 14 or the load means 15. For the movable table 14 to move, a sufficiently small dynamic friction force between the movable surface 14 and the installation surface 11 may be used, and the movable table 14 may be realized by mounting a wheel having a small dynamic friction force with the shaft. For example, the dynamic frictional force between the installation surface 11 and the movable table 14 is preferably one tenth or less of the dynamic frictional force between the cable 12 and the load means 15. The linear object fixing means 13 fixes the cable 12 so as not to move even when the movable base 14 is pulled. The linear object fixing means 13 only needs to be fixed to the installation surface 11.

  Although the weight 16 is used as the traction means, any means may be used as long as the movable base 14 is kept parallel to the cable 12 and the traction is stopped after the predetermined distance H is pulled with a constant force. For example, it may be provided with a stopper that pulls the distance H by a spring having a length sufficiently longer than the distance H and stops the spring contraction after the distance H is pulled. The movable table 14 may be pulled by a distance H with a motor, and after towing the distance H, the motor may be stopped.

可動台１４についての運動方程式は次式が得られる。

In FIG. 2, the speed of the movable base 14 when the weight 16 falls by the fall distance H is calculated. First, consider weight 16 exercise. Mass W of the weight 16, the gravitational acceleration g, mass _{m 0} of the movable base 14, mass _{m 1} of the load means 15, ₁ dynamic friction coefficient between the movable base 14 or load device 15 and the cable 12 mu, the acceleration Assuming that a is the equation of motion for the weight 16, the following equation is obtained.

The following equation is obtained as an equation of motion for the movable table 14.

これを書き直すと、次式が得られる。

From Equations 1 and 2, the acceleration a is obtained by the following equation.

Rewriting this gives the following equation:

数５より、

となる。落下距離Ｈを落下したとき、重り１６の速度Ｖ_０は、次式となる。

When the fall distance of the weight is H, the time t ₀ required to drop the fall distance H is obtained by the following equation.

From Equation 5,

It becomes. When the drop distance H is dropped, the speed V _{0 of the} weight 16 is as follows.

Next, consider the movement of the movable table 14 on which the load means 15 is placed. The movable table 14 which has reached the speed V _{0 due} to the fall of the weight 16 is then decelerated by the dynamic frictional force of the cable 12 and stops. It is assumed that t = 0 when the weight 16 is dropped by the drop distance H, and x = 0 is the position of the movable base 14. Since it is the dynamic frictional force of the cable 12 by the load means 15, the following equation is obtained as the equation of motion for the movable table 14 when the acceleration is α.

The acceleration α at this time is given by the following equation.

重り１６が落下距離Ｈを落下してからの時間ｔでの停止位置ｘ（ｔ）は、次式となる。

The speed v (t) at time t after the weight 16 falls the fall distance H is expressed by the following equation.

The stop position x (t) at time t after the weight 16 falls the fall distance H is expressed by the following equation.

となる。 Here, the movable table 14 is stopped time t _s until stopped by the dynamic friction force of the cable 12, in number 10, obtained at the v (t) = 0. That is,

It becomes.

数１２を代入する。

数７を代入する。

が得られる。 Than the number 12, mounted stop distance x _s at time t _s from the weight 16 may fall a drop distance H is represented by the following equation.

Expression 12 is substituted.

Expression 7 is substituted.

Is obtained.

From equation (15), the dynamic friction coefficient μ ₁ can be calculated as follows.

As can be seen from Equation 16, the mass W of the weight 16, the mass _{m 0} of the movable base 14, the mass _{m 1} of the load means 15, see fall distance H in advance, the movable platform 14 from the weight 16 may fall a drop distance H If the mounting stop distance x _s until the vehicle stops can be measured, the dynamic friction coefficient μ ₁ can be calculated.

A specific example is shown. The weight W of the weight 16 is 0.3 kg, the mass m ₀ of the movable table 14 is 0.2 kg, the mass m ₁ of the load means 15 is 0.1 kg, the drop distance H is 0.1 m, and the weight 16 is the drop distance. When the mounting stop distance x _s from when it falls by H until the movable base 14 stops is measured to be 0.2 m, the dynamic friction coefficient μ ₁ = 0.3 is obtained from Equation 16.

Further, the speed V ₀ of the weight 16 at this time is obtained by changing the ratio of the fall distance H or the weight W of the weight 16 and the mass m ₁ of the load means 15 as shown in Equation 7. be able to. As a specific example, V ₀ = 0.89 m / s is obtained under the same conditions as described above. That is, a dynamic friction coefficient is obtained when the cable is inserted or pulled out at a maximum speed of about 0.89 m / s.

The mounting stop distance x _s from when the weight 16 is dropped by the drop distance H to when it stops is measured by measuring the total stroke distance from when the movable base 14 starts moving until it stops and subtracting the drop distance H from that value. That's fine. The total stroke distance may be measured by measuring a distance scale on the installation surface 11. Moreover, after pulling the movable base 14 by the fall distance H, a stop distance measuring means (not shown) for measuring a mounting stop distance until the movable base 14 stops may be further provided. For example, it may be arranged so as to cross the laser beam by the movement of the movable table 14, and the total stroke distance may be measured at the position of the laser beam crossed. Alternatively, the total stroke distance may be measured from the reflection time of the ultrasonic pulse with respect to the movable table 14. Alternatively, a string may be tied to the movable platform, and the total stroke distance may be measured by the length of the string that is fed. Stopping distance measuring means, by subtracting the fall distance H from these full travel distance, to measure the mounting stopping distance x _s. The same applies to the following embodiments.

A dynamic friction coefficient calculation means (not shown) calculates a dynamic friction coefficient from the value input in advance and the measured stop distance x _{s according} to Equation 16.

According to this embodiment, the dynamic friction coefficient can be calculated from the mounting stop distance x _s until the movable base stops after the weight falls the drop distance H without measuring the dynamic friction coefficient. Further, the dynamic friction coefficient can be measured by pulling a linear object such as a communication cable at an actual pulling speed or pulling speed or at a speed exceeding the pulling speed.

(Second Embodiment)
The second embodiment of the present invention is a case where dynamic friction between the movable table and the installation surface is taken into consideration. A configuration of a dynamic friction coefficient measuring apparatus according to the second embodiment of the present invention will be described with reference to FIGS. 2 and 3, 11 is an installation surface, 12 is a cable as a linear object, 13 is a linear object fixing means for fixing one end of the cable 12, 14 is a movable base movable on the installation surface 11, 15 Is a load means for loading the cable 12, 16 is a weight as a traction means for pulling the movable base 14 by a predetermined distance with a constant traction force in the direction opposite to the linear object fixing means 13, and 17 is a weight 16 which is high. It is a buffer stand that is received when falling from the height H.

In the present embodiment, as shown in FIG. 3, a no-load stop distance x _t that is a stop distance until the movable table 14 stops by pulling the movable table 14 without mounting the cable 12 is measured. Calculating a dynamic friction coefficient mu ₂ the mounting surface 11 and the movable base 14 from the no-load stopping distance x _t. Calculated dynamic coefficient of friction was mu ₂ and measured mounted on the basis of the stopping distance x _s, to measure the dynamic friction coefficient mu ₁ of the movable table 14 or the load device 15 and the cable 12. The order of measurement of the no-load stop distance _{xt and} the measurement of the mount stop distance x _s is not limited. When measuring the unloaded stopping distance x _t, the movable platform 14 may be equipped with a load means 15, it may not be mounted. In the following, the measurement of the no-load stopping distance x _t, movable base 14 is mounted with the load means 15.

可動台１４についての運動方程式は次式が得られる。

Explaining the measurement of the no-load stopping distance x _t. In FIG. 3, the speed of the movable table 14 when the weight 16 falls by the fall distance H is calculated. First, consider weight 16 exercise. The mass of the weight 16 is W, the acceleration of gravity is g, the mass of the movable table 14 is m ₀ , the mass of the load means 15 is m ₁ , the coefficient of dynamic friction between the movable table 14 and the installation surface 11 is μ ₂ , and the acceleration is a. When the equation of motion for the weight 16 is obtained:

The following equation is obtained as an equation of motion for the movable table 14.

これを書き直すと、次式が得られる。

From equations 17 and 18, the acceleration a is obtained by the following equation.

Rewriting this gives the following equation:

数２１より、

となる。落下距離Ｈを落下したとき、重り１６の速度Ｖ_０は、次式となる。

When the fall distance of the weight is H, the time t ₀ required to drop the fall distance H is obtained by the following equation.

From Equation 21,

It becomes. When the drop distance H is dropped, the speed V _{0 of the} weight 16 is as follows.

Next, consider the movement of the movable table 14 on which the load means 15 is placed. The movable table 14 that has reached the speed V _{0 due} to the fall of the weight 16 is then decelerated by the dynamic frictional force between the movable table 14 and the installation surface 11 and stops. It is assumed that t = 0 when the weight 16 is dropped by the drop distance H, and x = 0 is the position of the movable base 14. Since it is a dynamic frictional force between the movable table 14 and the installation surface 11, the following equation is obtained as an equation of motion for the movable table 14 where acceleration is α.

The acceleration α at this time is given by the following equation.

重り１６が落下距離Ｈを落下してからの時間ｔでの停止位置ｘ（ｔ）は、次式となる。

The speed v (t) at time t after the weight 16 falls the fall distance H is expressed by the following equation.

The stop position x (t) at time t after the weight 16 falls the fall distance H is expressed by the following equation.

となる。 Here, the stop time t _t until the movable base 14 stops due to the dynamic frictional force of the installation surface 11 is obtained by setting v (t) = 0 in Equation 26. That is,

It becomes.

数２８を代入する。

数２３を代入する。

が得られる。 From Equation 28, the no-load stop distance x _t at the time t _t after the weight 16 falls the drop distance H is _expressed by the following equation.

Expression 28 is substituted.

Expression 23 is substituted.

Is obtained.

From Equation 31, the dynamic friction coefficient μ ₂ can be calculated as follows.

As can be seen from the number of 32, the mass W of the weight 16, the mass _{m 0} of the movable base 14, the mass _{m 1} of the load means 15, fall distance H is know in advance, the movable platform 14 from the weight 16 may fall a drop distance H There can if measuring the unloaded stop distance x _t to stop, to calculate the dynamic friction coefficient mu _2.

A specific example is shown. The weight W of the weight 16 is 0.3 kg, the mass m ₀ of the movable base 14 is 0.2 kg, the mass m ₁ of the load means 15 is 0.1 kg, the drop distance H is 0.1 m, and the cable 12 is not mounted. when after the movable base 14 which weight 16 is dropped by the drop distance H was 1.0m as measured no-load stopping distance _{x t} until the stop, from the number 61, the dynamic friction coefficient _mu 2 = 0.048 obtained It is done.

可動台１４についての運動方程式は次式が得られる。

The measurement of the mounting stop distance will be described. In FIG. 2, the speed of the movable base 14 when the weight 16 falls by the fall distance H is calculated. First, consider weight 16 exercise. The mass of the weight 16 is W, the acceleration of gravity is g, the mass of the movable table 14 is m ₀ , the mass of the load means 15 is m ₁ , the coefficient of dynamic friction between the movable table 14 or the load means 15 and the cable 12 is μ ₁ , and the movable table. Assuming that the dynamic friction coefficient between 14 and the installation surface 11 is μ ₂ and the acceleration is a, the equation of motion for the weight 16 is obtained as follows.

The following equation is obtained as an equation of motion for the movable table 14.

これを書き直すと、次式が得られる。

From Equations 33 and 34, the acceleration a is obtained by the following equation.

Rewriting this gives the following equation:

数３７より、

となる。落下距離Ｈを落下したとき、重り１６の速度Ｖ_０は、次式となる。

When the fall distance of the weight is H, the time t ₀ required to drop the fall distance H is obtained by the following equation.

From Equation 37,

It becomes. When the drop distance H is dropped, the speed V _{0 of the} weight 16 is as follows.

Next, consider the movement of the movable table 14 on which the load means 15 is placed. The movable table 14 that has reached the speed V _{0 due} to the fall of the weight 16 is then decelerated by the dynamic friction force between the movable table 14 and the installation surface 11 and the dynamic friction force between the cable 12, the movable table 14, and the load means 15. To do. It is assumed that t = 0 when the weight 16 is dropped by the drop distance H, and x = 0 is the position of the movable base 14. Since the dynamic frictional force between the movable table 14 and the installation surface 11 and the dynamic frictional force of the cable 12 by the load means 15, the equation of motion for the movable table 14 is obtained when the acceleration is α.

The acceleration α at this time is given by the following equation.

重り１６が落下距離Ｈを落下してからの時間ｔでの停止位置ｘ（ｔ）は、次式となる。

The speed v (t) at time t after the weight 16 falls the fall distance H is expressed by the following equation.

The stop position x (t) at time t after the weight 16 falls the fall distance H is expressed by the following equation.

となる。 Here, the stop time t _s until the movable base 14 is stopped by the dynamic friction of the surface on 11 and cable 12, the number 42, obtained at the v (t) = 0. That is,

It becomes.

数４４を代入する。

数３９を代入する。

が得られる。 Than the number 44, mounted stop distance x _s at time t _s from the weight 16 may fall a drop distance H is represented by the following equation.

Expression 44 is substituted.

Expression 39 is substituted.

Is obtained.

数３２より、次式が算出できる。

From Equation 47, the dynamic friction coefficient μ ₁ can be calculated as follows.

From Equation 32, the following equation can be calculated.

As can be seen from the number 49, the mass W of the weight 16, the mass _{m 0} of the movable base 14, the mass _{m 1} of the load means 15, see fall distance H in advance, the movable platform 14 from the weight 16 may fall a drop distance H If the no-load stop distance x _t and the mounting stop distance x _s until the vehicle stops can be measured, the dynamic friction coefficient μ ₁ can be calculated.

Alternatively, as can be seen from several 48, the mass W of the weight 16, the mass _{m 0} of the movable base 14, the mass _{m 1} of the load means 15, fall distance H, understand the dynamic friction coefficient mu ₂ in advance, the weight 16 is a falling distance H If the mounting stop distance x _s until the movable base 14 stops after dropping can be measured, the dynamic friction coefficient μ ₁ can be calculated.

A specific example is shown. The weight W of the weight 16 is 0.3 kg, the mass m ₀ of the movable base 14 is 0.2 kg, the mass m ₁ of the load means 15 is 0.1 kg, the drop distance H is 0.1 m, and the cable 12 is not mounted. when the movable base 14 from dropping weight 16 only falling distance H was 1.0m as measured no-load stopping distance _{x t} until the stop, from the number 32, the dynamic friction coefficient _mu 2 = 0.048 can get.

Further, the mass W of the weight 16 is 0.3 kg, the mass m ₀ of the movable table 14 is 0.2 kg, the mass m ₁ of the load means 15 is 0.1 kg, the drop distance H is 0.1 m, and the dynamic friction coefficient μ ₂ = 0. When the mounting stop distance x _s until the movable base 14 stops after the weight 16 is dropped by the drop distance H with the cable 12 mounted is 0.2 m. A dynamic friction coefficient μ ₁ = 0.23 is obtained.

The speed V ₀ which weight 16 at this time, as shown in Formula 39, fall distance H, or to obtain an arbitrary speed by varying the mass m ₁ ratio between the mass W and the load means 15 of the weight 16 Can do. As a specific example, V ₀ = 0.89 m / s is obtained under the same conditions as described above. That is, a dynamic friction coefficient is obtained when the cable is inserted or pulled out at a maximum speed of about 0.89 m / s.

A dynamic friction coefficient calculating means (not shown) calculates a dynamic friction coefficient from a value input in advance, the measured mounting stop distance x _s and no-load stop distance x _{t according} to Equation 49. Alternatively, the dynamic friction coefficient is calculated from the value inputted in advance, the measured dynamic friction coefficient μ _2, and the measured mounting stop distance x _{s according} to Equation 48.

  According to this embodiment, even if there is a dynamic friction force between the movable table and the installation surface, the dynamic friction coefficient can be calculated from the no-load stop distance and the mounting stop distance until the movable table stops. Further, the dynamic friction coefficient can be measured by pulling a linear object such as a communication cable at an actual pulling speed or pulling speed or at a speed exceeding the pulling speed.

(Third embodiment)
The third embodiment of the present invention is a case where dynamic friction between the movable table and the installation surface is taken into consideration. The configuration of a dynamic friction coefficient measuring apparatus according to the third embodiment of the present invention will be described with reference to FIG. In FIG. 4, 11 is an installation surface, 12 is a cable as a linear object, 13 is a linear object fixing means for fixing one end of the cable 12, 14 is a movable base movable on the installation surface 11, and 15 is a cable 12 A load means 16 for loading the cable 12 is a weight as a traction means for pulling the movable base 14 by a predetermined distance with a constant traction force in a direction opposite to the linear object fixing means 13, and 17 is a weight 16 from the height H. It is a buffer stand that receives when it falls.

In the present embodiment, as shown in FIG. 4, a no-load stop time t _t that is a stop time until the movable base 14 stops by pulling the movable base 14 without mounting the cable 12 is measured. The dynamic friction coefficient μ ₂ between the movable table 14 and the installation surface 11 is calculated from the no-load stop time t _t . Based on the calculated dynamic friction coefficient μ ₂ and the measured mounting stop distance x _s , the dynamic friction coefficient μ ₁ between the movable table 14 or the load means 15 and the cable 12 is measured. This embodiment is different from the second embodiment in the calculation of the dynamic friction coefficient μ ₂ . Here, describing calculation of the dynamic friction coefficient mu _2. The order of the measurement of the no-load stop time t _{t and} the measurement of the mounting stop distance x _s does not matter. When measuring the no-load stop time t _t , the movable table 14 may or may not be loaded with the load means 15. Hereinafter, in the measurement of the no-load stop time t _t , the movable table 14 is loaded with the load means 15.

可動台１４についての運動方程式は次式が得られる。

The measurement of the no-load stop time t _t will be described. In FIG. 4, the speed of the movable table 14 when the weight 16 falls by the fall distance H is calculated. First, consider weight 16 exercise. Mass W of the weight 16, the gravitational acceleration g, mass _{m 0} of the movable base 14, mass _{m 1} of the load means 15, ₂ dynamic friction coefficient between the movable base 14 and the installation surface 11 mu, the acceleration was a When the equation of motion for the weight 16 is obtained:

The following equation is obtained as an equation of motion for the movable table 14.

これを書き直すと、次式が得られる。

From Equations 50 and 51, the acceleration a is obtained by the following equation.

Rewriting this gives the following equation:

数５４より、

となる。落下距離Ｈを落下したとき、重り１６の速度Ｖ_０は、次式となる。

When the fall distance of the weight is H, the time t ₀ required to drop the fall distance H is obtained by the following equation.

From Equation 54,

It becomes. When the drop distance H is dropped, the speed V _{0 of the} weight 16 is as follows.

Next, consider the movement of the movable table 14 on which the load means 15 is placed. The movable table 14 that has reached the speed V _{0 due} to the fall of the weight 16 is then decelerated by the dynamic frictional force between the movable table 14 and the installation surface 11 and stops. It is assumed that t = 0 when the weight 16 is dropped by the drop distance H, and x = 0 is the position of the movable base 14. Since it is a dynamic frictional force between the movable table 14 and the installation surface 11, the following equation is obtained as an equation of motion for the movable table 14 where acceleration is α.

The acceleration α at this time is given by the following equation.

The speed v (t) at time t after the weight 16 falls the fall distance H is expressed by the following equation.

となる。数５９、数６０から

Here, the no-load stop time t _t that is the stop time until the movable base 14 stops due to the dynamic frictional force of the installation surface 11 is obtained by setting v (t) = 0 in Equation 59. That is,

It becomes. From number 59 and number 60

As can be seen from several 61, the mass W of the weight 16, the mass _{m 0} of the movable base 14, the mass _{m 1} of the load means 15, see fall distance H in advance, after the movable table 14 at which the weight 16 is dropped falling distance H If the no-load stop time t _t until stopping can be measured, the dynamic friction coefficient μ ₂ can be calculated.

A specific example is shown. Mass W = 0.3 kg of the weight 16, the mass _m 0 = 0.2 kg of the movable table 14, the mass _m 1 = 0.1 kg of load means 15, the falling distance H = 0.1 m, with no installed cables 12 When the no-load stop time t _t until the movable table 14 stops after the weight 16 falls by the drop distance H is 2.05 s, the dynamic friction coefficient μ ₂ = 0.048 is obtained from Equation 61. It is done.

The dynamic friction coefficient calculating means (not shown) calculates the dynamic friction coefficient μ ₁ from the value inputted in advance, the measured dynamic friction coefficient μ ₂ and the mounting stop distance x _{s according} to the equation (48).

According to this embodiment, even if there is a dynamic friction force between the movable table and the installation surface, the dynamic friction coefficient μ ₂ and the weight between the movable table and the installation surface fall without measuring the dynamic friction coefficient μ ₁ from the dynamic friction force. It can be calculated from the mounting stop distance x _s until the movable platform stops after dropping the distance H. Further, it is possible to measure the dynamic friction coefficient mu ₁ linear, such as communication cables pulling the actual towing speed or drawing speed or in speed above it.

(Fourth embodiment)
The fourth embodiment of the present invention is a case where dynamic friction between the movable table and the installation surface is taken into consideration. The configuration of a dynamic friction coefficient measuring apparatus according to the fourth embodiment of the present invention will be described with reference to FIG. 5, 11 is an installation surface, 12 is a cable as a linear object, 13 is a linear object fixing means for fixing one end of the cable 12, 14 is a movable base movable on the installation surface 11, and 15 is a cable 12. A load means 16 for loading, a weight as a traction means for pulling the movable base 14 by a predetermined distance with a constant traction force in a direction opposite to the linear object fixing means 13, and 17 a weight 16 falling from a height H It is a buffer stand that you receive when you do.

In the present embodiment, as shown in FIG. 5, a no-load moving time t ₁ that is a moving time from when the movable table 14 starts to be moved by a predetermined distance after the movable table 14 starts to be pulled without the cable 12 mounted. taking measurement. The dynamic friction coefficient μ ₂ between the movable table 14 and the installation surface 11 is calculated from the no-load movement time t ₁ . Based on the calculated dynamic friction coefficient μ ₂ and the measured mounting stop distance x _s , the dynamic friction coefficient μ ₁ between the movable table 14 or the load means 15 and the cable 12 is measured. This embodiment is different from the second embodiment in the calculation of the dynamic friction coefficient μ ₂ . Here, describing calculation of the dynamic friction coefficient mu _2. The order of measurement of the no-load travel time t ₁ measured and the mounting stopping distance x _s does not matter. When measuring the no-load movement time t ₁ , the movable table 14 may or may not be loaded with the load means 15. In the following, the measurement of the no-load travel time t _1, the movable platform 14 is equipped with a load means 15.

可動台１４についての運動方程式は次式が得られる。

Explaining the measurement of the no-load travel time t _1. In FIG. 5, the speed of the movable base 14 when the weight 16 falls by the fall distance H is calculated. First, consider weight 16 exercise. The mass of the weight 16 is W, the acceleration of gravity is g, the mass of the movable table 14 is m ₀ , the mass of the load means 15 is m ₁ , the coefficient of dynamic friction between the movable table 14 and the installation surface 11 is μ ₂ , and the acceleration is a. When the equation of motion for the weight 16 is obtained:

The following equation is obtained as an equation of motion for the movable table 14.

これを書き直すと、次式が得られる。

From equations 62 and 63, acceleration a is obtained by the following equation.

Rewriting this gives the following equation:

数６６より、

となる。落下距離Ｈを落下したとき、重り１６の速度Ｖ_０は、次式となる。

When the fall distance of the weight is H, the time t ₁ required to drop the fall distance H is obtained by the following equation.

From Equation 66

It becomes. When the drop distance H is dropped, the speed V _{0 of the} weight 16 is as follows.

数６９より、次式が得られる。

From Equations 65 and 66, the dynamic friction coefficient μ ₂ can be calculated as follows.

From Equation 69, the following equation is obtained.

As can be seen from the number 70, the mass W of the weight 16, the mass m ₀ of the movable table _14, from the mass m _1, see fall distance H in advance weight 16 of the load means 15 starts falling, dropping a drop distance H If the no-load movement time t ₁ until the measurement can be measured, the dynamic friction coefficient μ ₂ can be calculated.

A specific example is shown. The weight W of the weight 16 is 0.3 kg, the mass m ₀ of the movable base 14 is 0.2 kg, the mass m ₁ of the load means 15 is 0.1 kg, the drop distance H is 0.1 m, and the cable 12 is not mounted. When the no-load movement time t ₁ until the weight 16 falls by the drop distance H is 0.207 s, the dynamic friction coefficient μ ₂ = 0.048 is obtained from Equation 70.

The dynamic friction coefficient calculating means (not shown) calculates the dynamic friction coefficient μ ₁ from the value inputted in advance, the measured dynamic friction coefficient μ ₂ and the mounting stop distance x _{s according} to the equation (48).

According to this embodiment, even if there is a dynamic friction force between the movable table and the installation surface, the dynamic friction coefficient μ ₂ and the weight between the movable table and the installation surface fall without measuring the dynamic friction coefficient μ ₁ from the dynamic friction force. after carriage dropped the distance H can be calculated from the mounting stop time t _s until the stop. Further, the dynamic friction coefficient μ ₁ can be measured by pulling a linear object such as a communication cable at an actual pulling speed or pulling speed or at a speed exceeding the pulling speed.

(Fifth embodiment)
The configuration of a dynamic friction coefficient measuring apparatus according to the fifth embodiment of the present invention will be described with reference to FIG. In FIG. 6, 11 is an installation surface, 12 is a cable as a linear object, 13 is a linear object fixing means for fixing one end of the cable 12, 14 is a movable base movable on the installation surface 11, and 15 is a cable 12 A load means 16 for loading the cable 12, a weight as a traction means for pulling the movable base 14 with a constant traction force in the direction opposite to the linear object fixing means 13, and a buffer base 17 for receiving when the weight 16 falls, Reference numeral 18 denotes stress measuring means for measuring the force applied to the linear object fixing means 13.

  The shape and material of the contact surfaces of the mounting guide 14a and the load guide 15a with the cable 12 are the same as in the first embodiment.

In the first embodiment, the mass W of the weight 16, the mass _{m 0} of the movable base 14, the mass _{m 1} of the load means 15, see fall distance H in advance, the movable base from the weight 16 may fall a drop distance H 14 The mounting stop distance x _s until the vehicle stopped was measured, and the dynamic friction coefficient μ ₁ was calculated. In the present embodiment, as shown in FIG. 6, the mass W of the weight 16 and the mass m ₁ of the load means 15 are known in advance, and the force applied as the tensile force to the cable 12 after starting to pull the movable base 14, that is, The force on the linear object fixing means 13 is measured, and the dynamic friction coefficient μ ₁ is calculated. The force to the linear object fixing means 13 is measured by the stress measuring means 18.

数７１より、動摩擦係数μ_１が算出できる。

The dynamic friction coefficient μ ₁ can be calculated as follows:

From Equation 71, the dynamic friction coefficient μ ₁ can be calculated.

As can be seen from Equation 72, if the mass m ₁ of the load means 15 is known in advance and the force F can be measured after the weight 16 starts to fall, the dynamic friction coefficient μ ₁ can be calculated. In this embodiment, as can be seen from Equation 72, even if there is a dynamic frictional force between the installation surface 11 and the movable table 14, the measurement of the dynamic friction coefficient is not affected.

A specific example is shown. When the mass m ₁ = 0.1 kg of the load means 15 is known in advance and the force F is measured, when F = 0.59 kg · m / s ² , the dynamic friction coefficient μ ₁ = 0.3 is obtained from Equation 72. It is done.

数７３より、

となる。落下距離Ｈを落下したとき、重り１６の速度Ｖ_０は、次式となる。

When the fall distance of the weight is H, the time t ₀ required to drop the fall distance H is obtained by the following equation.

From Equation 73,

It becomes. When the drop distance H is dropped, the speed V _{0 of the} weight 16 is as follows.

A specific example is shown. As shown in Formula 75, an arbitrary speed can be obtained by changing the ratio of the drop distance H or the mass W of the weight 16 and the mass m ₁ of the load means 15. As a specific example, under the condition that the mass W of the weight 16 is 0.3 kg, the mass m ₁ of the load means 15 is 0.1 kg, and the drop distance H is 0.1 m, V ₀ = 0.89 m / s is obtained. It is done. That is, if the force F when the weight 16 falls by H = 0.1 m is measured, the dynamic friction coefficient when the cable is inserted or pulled out at a speed of about 0.89 m / s can be obtained.

  A dynamic friction coefficient calculation unit (not shown) calculates a dynamic friction coefficient from a value input in advance and the measured force F according to Equation 72.

  According to this embodiment, it is possible to measure a coefficient of dynamic friction by pulling a linear object such as a quadrilateral communication cable having a rectangular or square cross section at an actual pulling speed or a pulling speed. It can be calculated from the force applied as the tensile force. Furthermore, according to the present embodiment, the dynamic friction coefficient can be measured by pulling the linear object at the actual pulling speed or the pulling speed regardless of the dynamic friction between the movable table and the installation surface.

  The dynamic friction coefficient measuring apparatus of the present invention can be applied to the measurement of the dynamic friction coefficient of a linear object such as a cable.

11: Installation surface 12: Cable 13 as a linear object 13: Linear object fixing means 14: Movable base 14a: Mounting guide 15: Load means 15a: Load guide 16: Weight as traction means 17: Buffer base 18: Stress measurement Means 19: Weighting means fixing guide

Claims (21)

A dynamic friction coefficient measuring device for measuring a dynamic friction coefficient of a linear object,
A linear object fixing means for fixing one end of the linear object;
A movable base having a mounting guide for mounting the linear object, and movable on the installation surface;
A load means for contacting the linear object facing the mounting guide of the movable table, and loading means for loading the linear object via the load guide;
Traction means for towing the movable table with a constant traction force in a direction opposite to the linear object fixing means,
The dynamic friction coefficient measuring device according to claim 1, wherein contact surfaces of the mounting guide and the load guide with the linear object have a flat shape. The pulling means pulls the movable table by a predetermined distance with a constant pulling force,
The dynamic friction coefficient measuring device according to claim 1, further comprising stop distance measuring means for measuring a stop distance from when the movable table is pulled by the predetermined distance until the movable table stops.   Mounting that is a stopping distance until the movable base stops after the movable base is pulled by the predetermined distance while holding the linear object between the mounting guide and the load guide measured by the stop distance measuring means. The dynamic friction coefficient measuring device according to claim 2, further comprising dynamic friction coefficient calculation means for calculating a dynamic friction coefficient of the linear object from a stop distance.   Mounting that is a stopping distance until the movable base stops after the movable base is pulled by the predetermined distance while holding the linear object between the mounting guide and the load guide measured by the stop distance measuring means. 3. The apparatus according to claim 2, further comprising dynamic friction coefficient calculating means for calculating a dynamic friction coefficient of the linear object from a stop distance and a dynamic friction coefficient between the movable table and the installation surface when the linear object is not mounted. The dynamic friction coefficient measuring device described.   The movable base and the installation surface from a no-load stop distance, which is a stop distance until the movable base stops after the dynamic friction coefficient calculating means pulls the movable base by a predetermined distance without mounting the linear object. The dynamic friction coefficient measuring apparatus according to claim 4, wherein the dynamic friction coefficient is calculated.   The movable base and the installation surface from a no-load stop time, which is a stop time until the movable base stops after the dynamic friction coefficient calculating means pulls the movable base by a predetermined distance without mounting the linear object. The dynamic friction coefficient measuring apparatus according to claim 4, wherein the dynamic friction coefficient is calculated.   The movable base and the installation from the no-load movement time, which is the movement time from when the dynamic friction coefficient calculating means starts to pull the movable base without mounting the linear object until the movable base moves by a predetermined distance The dynamic friction coefficient measuring device according to claim 4, wherein a dynamic friction coefficient with a surface is calculated.   It further comprises stress measuring means for holding the linear object fixing means, and measuring the force applied to the linear object fixing means via the linear object while the pulling means pulls the movable base. The dynamic friction coefficient measuring apparatus according to claim 1, wherein   9. The dynamic friction coefficient measuring device according to claim 8, further comprising dynamic friction coefficient calculating means for calculating a dynamic friction coefficient of the linear object from the force measured by the stress measuring means.   The dynamic friction coefficient measuring apparatus according to claim 1, wherein the pulling means has a weight that pulls the movable table and drops from the same height as the predetermined distance.   The dynamic friction coefficient measuring apparatus according to claim 1, wherein the pulling unit has a weight that pulls the movable table to drop.   The dynamic friction coefficient according to any one of claims 1 to 11, wherein the contact surfaces of the mounting guide and the load guide with the linear object are made of the same material as that of the surface of the linear object. measuring device. A dynamic friction coefficient measuring method for measuring a dynamic friction coefficient of a linear object,
Fix one end of the wire,
The linear object is mounted, the mounting surface of the contact surface with the linear object has a flat mounting guide, a movable table movable on the installation surface, and the mounting table facing the mounting guide of the movable table While holding the linear object with load means for accommodating the linear object, having a load guide having a flat contact surface with the linear object, and loading the linear object with the load guide, Tow the movable base by a predetermined distance with a constant traction force in the direction of the other end of the linear object,
The dynamic friction coefficient of the linear object is measured by measuring a mounting stop distance, which is a stop distance from when the movable base is pulled by the predetermined distance until the movable base stops. Coefficient measurement method.   The dynamic friction coefficient according to claim 13, wherein the dynamic friction coefficient of the linear object is calculated from the dynamic friction coefficient between the movable table and the installation surface when the linear object is not mounted. Measuring method.   The coefficient of dynamic friction between the movable base and the installation surface when the linear object is not mounted is such that the movable base stops after the movable base is pulled by a predetermined distance with a constant pulling force without mounting the linear object. The dynamic friction coefficient measuring method according to claim 14, wherein the calculation is performed by measuring a no-load stop distance that is a stop distance until the start.   The coefficient of dynamic friction between the movable base and the installation surface when the linear object is not mounted is such that the movable base stops after the movable base is pulled by a predetermined distance with a constant pulling force without mounting the linear object. The dynamic friction coefficient measurement method according to claim 14, wherein the calculation is performed by measuring a no-load stop time that is a stop time until the start.   When the linear object is not mounted, the coefficient of dynamic friction between the movable table and the installation surface pulls the movable table by a predetermined distance with a constant traction force without mounting the linear object, and pulls the movable table. The dynamic friction coefficient measuring method according to claim 14, wherein the dynamic friction coefficient measuring method is calculated by measuring a no-load moving time which is a moving time until the movable table moves by a predetermined distance after starting to move.   18. The movable table is pulled by a predetermined distance with a constant traction force by dropping a weight for pulling the movable table from the same height as the predetermined distance. The dynamic friction coefficient measuring method as described. A dynamic friction coefficient measuring method for measuring a dynamic friction coefficient of a linear object,
While holding one end of the wire,
The linear object is mounted, the mounting surface of the contact surface with the linear object has a flat mounting guide, a movable table movable on the installation surface, and the mounting table facing the mounting guide of the movable table While holding the linear object with load means for accommodating the linear object, having a load guide having a flat contact surface with the linear object, and loading the linear object with the load guide, Tow the movable base by a predetermined distance with a constant traction force in the direction of the other end of the linear object,
A dynamic friction coefficient measuring method, wherein the dynamic friction coefficient of the linear object is measured by measuring a force applied as a tensile force to the linear object while the pulling means pulls the movable table.   The dynamic friction coefficient measuring method according to claim 19, wherein the movable table is pulled with a constant traction force by dropping a weight that pulls the movable table.   The dynamic friction coefficient according to any one of claims 13 to 20, wherein the contact surfaces of the mounting guide and the load guide with the linear object are made of the same material as that of the surface of the linear object. Measuring method.

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