JPH01116431A - Correction of mutual interference in composite force tester - Google Patents

Abstract

PURPOSE:To simply and accurately perform an accurate composite force test by preliminarily measuring a ratio of mutual interference to set the same as a correction value to separate axial direction load and distortion direction load. CONSTITUTION:In such a state that the load sensor and torque sensor used in a test are mounted, a sample becoming dummy load is used to preliminarily measure the ratio K1 of the effect of axial direction load on the torque sensor and the ratio K2 of the effect of distortion direction load on the load sensor. A multiplier 11 multiplies the output Lr from the load sensor by K1 and a multiplier 12 multiples the output Tr from the torque sensor by K2. An adder 13 adds the output Lr of the load sensor and the output from the multiplier 12 while an adder 14 adds the output Tr of the torque sensor and the output of the multiplier 11. A multiplier 15 multiplies the output of the adder 13 by 1/(1-K1K2) and a multiplier 16 multiplies the output of the adder 14 by 1/(1-K1K2).

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to the case where a test piece is subjected to a combined force tester by applying an axial load such as a tensile load and a torsional load at the same time. Sensor that detects (Z-axis sensor)
The present invention relates to a method for correcting the influence of the torsional load on the torsional load and the influence of the axial load on a sensor that detects the torsional load.

[Conventional technology]

As a conventional compound force testing machine, there is one described in, for example, Japanese Utility Model Publication No. 56-29716, filed by the applicant of the present invention. This corresponds to frame 1, as shown in Figure 3.
A sensor 2 incorporating a load sensor and a torque sensor is fixed to the sensor 2, one end of a test piece 4 is fixed to this sensor 2 via a chuck 3, and the other end of the test piece 4 is fixed to the sensor 2 via a chuck 5. It is fixed to a power transmission rod 6 to which a repeated axial load and a repeated torsional load force 5 are applied.

In the conventional combined force testing machine described above, the load sensor in the sensor 2 detects the axial load of the loft 6 applied to the test piece 4, and the torque sensor in the sensor 2 detects the torsional load. Then, load output Lr and torque output T
Send r.

[Problem that the invention seeks to solve]

By the way, in the conventional combined test method described above, the load sensor that measures the axial load and the torque sensor that measures the torsional load are influenced by the mechanical relationship determined by the internal structure of the sensor 2. There was a problem in that the true values could not be measured and errors occurred in the test data because they were given to each other.

[Means for solving problems]

The present invention is intended to solve the above-mentioned problems.By measuring and setting the mutual interference ratio in advance, the axial load and torsional load can be completely separated and the true value acting on the test piece can be obtained. The method is to correct the influence of the axial load on the torsional load sensor and the influence of the torsional load on the axial load sensor, respectively. When the torque sensor that detects the load is combined, use a dummy load to measure the ratio of the influence of the axial load on the torque sensor and the ratio of the influence of the torsional load on the load sensor, and based on this ratio. This is done by a mutual interference correction method in a composite force testing machine that corrects the measured values obtained from the load sensor and torque sensor during actual operation.

[For production]

The mutual interference correction method in the combined force testing machine of the present invention is to multiply the output from the load sensor by 1 by the ratio of the influence that the axial load has on the torque sensor, and add the output from the torque sensor to this value. Also, multiply the output from the torque sensor by 2 to the ratio of the effect of the torsional load on the load sensor, add the output from the load sensor to this value, and calculate the true torsional load value obtained by adding each of the above. This is to obtain the axial load value.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

Now, let Lo be the true load value obtained by an axial load that is not affected by a torsional load, and To be the true torque value obtained by a torsional load that is not affected by an axial load. , Furthermore, if the load value of the load sensor obtained in the actual test is Lr, and the torque value of the torque sensor similarly obtained in the actual test is Tr, then T r = T o + k s L O...・
...(1) L r = Lo + k, T o
= (2) where, kl: The ratio of the influence of the axial load on the torque sensor, kl: The ratio of the influence of the torsional direction load on the load sensor.

Therefore, when finding the true value from equations (1) and (2) above,
In other words, the ratio of the crosstalk component that appears on the torque sensor when an axial load is applied independently is 1, and the ratio of the crosstalk component that appears on the load sensor when a torsional load is applied independently is 2. be.

Since the value of 2 for this kl* is determined by the internal structure of the sensor, it is measured in advance using a sample serving as a dummy load with the load sensor and torque sensor used in the test attached.

Now, if the kl value and the two values are constant values that do not depend on the applied load, and when the mutually applied load is zero, the amount of crosstalk is also zero, then this can be determined by the circuit shown in FIG.

That is, in Fig. 1, 11 is a calculator for multiplying the output Lr from the load sensor by the kl value, which is the ratio of the influence of the axial load on the torque sensor, and 12 is a calculator for calculating the output from the torque sensor. The output Tr is multiplied by a binary value, which is the ratio of the influence of the torsional load on the load sensor, and 13 is the output Lr from the load sensor. 14 is an adder that adds the output Tr from the torque sensor and the output from the calculator 11 multiplied by 1, and outputs the difference; 15 is the adder 1 and the sensor 2
When the respective multiplications of Lr and Tr, which are the outputs of Therefore, a true load LO unaffected by torsional loads and a true torque TO unaffected by axial loads can be obtained.

In addition, Figure 2 is an explanatory diagram of mutual interference, that is, it shows the influence that an axial load has on the torque sensor and the influence that a torsional load has on the load sensor, and the degree of each influence is corrected. The values are shown by slopes of 1 and 2.

〔Effect of the invention〕

As described above, in the present invention, by measuring the rate of mutual interference in advance and setting it as a correction value, the axial load and the load in the pattern direction are completely separated, so the true value acting on the test piece can be obtained. Therefore, it has the effect that an accurate combined force test can be performed simply and easily.

[Brief explanation of the drawing]

Fig. 1 is a block diagram for carrying out the method of the present invention, Fig. 2 is a diagram showing mutual interference between axial load and torsional load on the torque sensor and load sensor, and Fig. 3 is a composite force testing machine. FIG. 2...Sensors including a load sensor and a torque sensor, 4.
...test piece, 6...rod, 11...k1 multiplication calculator, 12...k2 multiplication calculator, 13.14...adder,
15゜ Figure 1 Figure 2 Omit Ω Figure 3 Procedural amendments (Voluntary initiative) January 21, 1986 Commissioner of the Japan Patent Office / J1JII Tono Tasuo 1,
3fR Cow Lm 1985 Patent Application No. 273489 2 Name of the invention Mutual interference correction method in a complex force testing machine 3 Person making the correction Relationship with Hanyu Patent applicant address 2-55-5 Wakamiya, Nakano-ku, Tokyo Name: Saginomiya Seisakusho Co., Ltd. 4, Agent Figure 1

Claims (1)

[Claims] In the method of correcting the influence of axial load on the torsional load sensor and the influence of torsional load on the axial load sensor, a load sensor that detects axial load and a torque sensor that detects torsional load are combined. The ratio of the influence of the axial load on the torque sensor and the ratio of the influence of the torsional load on the load sensor are measured using a dummy load, and based on these ratios, the load sensor and torque sensor are adjusted during actual operation. A method for correcting mutual interference in a composite force testing machine, characterized in that the measured values obtained from the above are corrected.