JP2003106932A - Evaluation method of fishing rod sensitivity - Google Patents

Abstract

PROBLEM TO BE SOLVED: To objectively evaluate fishing rod sensitivity. SOLUTION: A fishing rod 10 is suspended from a fixed object 12 such as a ceiling by long thread bodies A1, A2 suspended in the vertical direction and is held in a horizontal condition. A tip part of the fishing rod is hitted in the horizontal direction by a built-in impulse hammer 14 of an acceleration sensor to apply vibration, an output signal from the acceleration sensor mounted in a rear end part of the fishing rod is inputted into a frequency analyzer 16 to detect transmission characteristics of the vibration, and the results of detection are expressed by numerical values, which are used as sensitivity of the fishing rod.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for numerically evaluating the sensitivity of a fishing rod, that is, the sensing performance of a fishstring and the feeling of response when searching the bottom of a fishing ground.

[0002]

2. Description of the Related Art Sensitivity characteristics are very important among fishing rod characteristics. How to catch a small fishery without missing it greatly affects the results of fishing. In addition, it is important that the sensitivity of the fishing rod is high when the condition of the bottom of the fishing ground is examined (searched).

[0003]

However, in spite of such important characteristics, until now, only the sensitivity of the fishing rods has been subjectively evaluated, and the relative evaluation of the sensitivity between the fishing rods is not always correct. Not done. Therefore, the present invention aims to objectively evaluate the sensitivity of a fishing rod.

[0004]

In view of the above object, in claim 1 of the present invention, a predetermined vibration is applied to a predetermined position of a fishing rod,
There is provided a method for evaluating the sensitivity of a fishing rod, wherein the transmission characteristic of the vibration is detected at a position rearward of the predetermined position, and the detection result is expressed numerically as the sensitivity of the fishing rod. Numerical expression means not only expressing the numerical value directly,
Even if it is expressed as rank A, B, C, or D, it also includes the case where A, B, C, D is supported by numerical values. The values representing the transmission characteristics of vibration include the ratio of the power of the input vibration to the power of the detected vibration, the ratio of the amplitude, the acceleration ratio of the vibration, and the like. If these values are used to evaluate the sensitivity of the fishing rod, the sensitivity comparison between fishing rods can be performed objectively. Naturally, the fishing rods that can be compared are, for example, lure rods for lure rods, ayu rods for ayu rods, and the predetermined position for vibration input in such rods is the representative position of the rod tip. . However, for example, it may be determined that the position is a percentage of the total length from the tip to the rear. In addition, as long as the ratio of output / input is used for the transfer characteristic to compare the sensitivities, the overall strength (amplitude) can be obtained by changing the input vibration to the same frequency distribution for each fishing rod to be tested. You may change. It is described as a predetermined vibration in the sense that the frequency distributions are the same.

According to a second aspect of the present invention, a predetermined position of the fishing rod is horizontally fixed at a predetermined position in a state where the fishing rod is supported in a vertical plane so as not to constrain the degree of freedom in the horizontal direction which is a direction in which the rod is bent by vibration. There is provided a method for evaluating the sensitivity of a fishing rod, which comprises vibrating and detecting a transmission characteristic of the vibration at a position rearward of the predetermined position and numerically expressing the detection result as the sensitivity of the fishing rod. In claim 1, the method of vibration input is not defined, but in claim 2, the fishing rod is supported in the vertical plane so as not to constrain the degree of freedom in the horizontal direction (for example,
Therefore, when a predetermined vibration is horizontally applied, the vibration is prevented from being attenuated by supporting the fishing rod, and the transmission characteristic of the fishing rod itself can be detected purely.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the accompanying drawings. FIG. 1 is a diagram schematically showing a test for evaluating the sensitivity of a fishing rod according to the present invention. A fishing rod 10 that uses a fiber-reinforced rod 10S that is made of a synthetic resin such as epoxy resin as a matrix and is reinforced with reinforcing fibers such as carbon fibers is fixed to the ceiling by a long filament A1 and A2 that hangs vertically. It is hung on the object 12 and holds the fishing rod in a horizontal state. There is no other restraint for the fishing rod, and the fishing rod 10 is free to move in the horizontal direction with respect to the length of the yarn body in a small movement such as vibration of the rod.

The fishing rod 10 here is a lure rod, and a handle portion 10H is coupled to the rear end portion of the rod rod 10S.
The thread A1 is at the trigger rear end position of the handle portion, and the thread A2 on the front side is substantially at the center position of the rod 10S. Here, in order to input the vibration to the tip portion of the fishing rod 10 and detect the vibration transmission characteristic of the fishing rod 10, here, the acceleration sensor S is provided at the rear end portion (rod end portion) of the handle portion 10H which is the rear position thereof. It was attached and tested. Alternatively, the test may be performed by mounting the acceleration sensor S on the reel seat portion 10R.

Here, the input vibration is struck by vibrating the tip of the fishing rod in the horizontal direction by an impulse hammer 14 having a built-in acceleration sensor to vibrate, and the output of this sensor is input to a frequency analyzer (FFT analyzer) 16. . On the other hand, the output from the acceleration sensor S attached to the rear end of the fishing rod is also input to the frequency analyzer 16. Here, the output of the frequency analyzer 16 is set so as to output the next output value (dB) to the display unit or the like. 20 · log ₁₀ (B / A) A: Acceleration of input vibration B: Acceleration of output vibration

As a result of the test, for frequencies of 200 Hz or less, there are five excellent output frequencies (frequency at which the output value is higher than the peripheral frequency, that is, the maximum frequency), and the corresponding output values ( dB) is as follows. Fundamental wave 1st harmonic 2nd harmonic 3rd harmonic 4th harmonic (Hz) 17.0 38.5 68.5 108 162 (dB) 66.5 72.4 76.2 73.6 73.5 In this way, the sensitivity of the fishing rod 10 used in the test is represented by, for example, the output value (dB) for each peak, or is represented by the maximum output value (in this case, 76.2 Hz of the second harmonic). .

Next, the test results of another fishing rod 20 (not shown) to be compared will be illustrated. Fundamental wave 1st harmonic 2nd harmonic 3rd harmonic 4th harmonic (Hz) 16.5 38.0 68.5 106 160 (dB) 60.8 65.9 69.3 69.0 69.4 In any of the peaks, the output value (dB) is higher in the fishing rod 10, and even if it is the maximum output value (fourth harmonic in the fishing rod 20) or even in comparison with the second harmonics. , Fishing rod 1
0 is higher.

When the vibration transmissibility is expressed by a numerical value as described above, it is convenient because the purchaser can use it as a guide for selecting a fishing rod. That is, those who want a fishing rod with higher vibration transmission,
In the above case, the fishing rod 10 will be purchased.

In the above description, the fishing rod 10 is suspended in a horizontal state, but it is not necessarily horizontal and may be inclined. Further, in addition to suspending the yarn body at two places, for example, while keeping the yarn body A2, the other yarn body A1 is supported by receiving the fishing rod from below and not horizontally restraining the fishing rod. You may change to the cradle etc. In addition to the method in which the vicinity of the rear end of the fishing rod is completely fixed and supported and the vibration direction is not limited to the horizontal direction, the method may be a test in which the fishing rod is stood up. The point is to test the fishing rods to be compared under the same restraint conditions.

The fishing rod to be evaluated (test object) is not limited to the lure rod and may be of any type. Furthermore, the input position, the mounting position of the output sensor, and the like are arbitrary except that the output position is set to the rear position with respect to the input position. In addition to the impulse hammer, a test may be performed using a shaker that continuously vibrates. Further, since vibration is less likely to be felt at high frequencies, only vibrations of 200 Hz or less are targeted, but the measurement target range may be appropriately changed to 400 Hz or 100 Hz.

[0014]

As is apparent from the above description, according to the present invention, the sensitivity of a fishing rod can be objectively evaluated.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a test for evaluating the sensitivity of a fishing rod according to the present invention.

[Explanation of symbols]

10 fishing rods 14 Impulse hammer 16 FFT analyzer A1, A2 thread body S acceleration sensor

Claims (2)

[Claims] 1. A predetermined vibration is applied to a predetermined position of a fishing rod,
A method for evaluating the sensitivity of a fishing rod, wherein the transmission characteristic of the vibration is detected at a position rearward of the predetermined position, and the detection result is expressed numerically as the sensitivity of the fishing rod. 2. A predetermined position of the fishing rod is horizontally vibrated at a predetermined position in a state where the fishing rod is supported in a vertical plane so as not to restrict the degree of freedom in the horizontal direction, which is the direction in which the rod is bent by vibration. A method for evaluating the sensitivity of a fishing rod, wherein the transmission characteristic of the vibration is detected at a position rearward of the predetermined position, and the detection result is numerically expressed as the sensitivity of the fishing rod.