Summary of the invention
The objective of the invention is to design a kind of graphical recording method of force value tests, make the power value change curve that it can the whole measuring process of accurate response, improve anti-interference simultaneously again.
In order to achieve the above object, the present invention adopts following technical solution:
A kind of graphical recording method of force value tests, it comprises regularly value trace-point method, and its value and described point T.T. are T, and the time interval is Δ T, it is characterized in that:
(1) also comprises regularly ergometry value method, the force measurement time of described timing ergometry value method is t, measuring intervals of TIME is Δ t, measuring intervals of TIME Δ t is less than value in the described timing value trace-point method and described point time interval Δ T several times, and described timing ergometry value method is also to three ergometry value Y of continuous acquisition
N-1, Y
n, Y
N+1Compare mutually, determine the time t that crest and trough produce
nWith corresponding force value Y
n
(2) also comprise additional trace-point method, it adds described point with the crest definite in the described timing ergometry value method or the corresponding force value of trough in described timing value trace-point method.
Three ergometry value Y of described timing ergometry value method continuous acquisition
N-1, Y
n, Y
N+1Different Results by following comparison writes down described point:
(1) works as Y
N-1<Y
n<Y
N+1Or Y
N-1>Y
n>Y
N+1The time, graphic recording carries out the graphic recording described point by described timing value trace-point method;
Because Y
N-1<Y
n<Y
N+1Or Y
N-1>Y
n>Y
N+1, it is an incremental change or decrement that the explanation of force value changes, and crest and trough flex point do not occur.
(2) work as Y
N-1<Y
n, Y
N+1<Y
nThe time, crest produces, and the time point position that produces of crest and the described point time point position of described timing value trace-point method do not repeat, and described timing value trace-point method is with crest power value Y
nAs the additional force value at time t
N+1The point position adds described point;
(3) work as Y
N-1>Y
n, Y
N+1>Y
nThe time, trough produces, and the time point position that produces of trough and the described point time point position of described timing value trace-point method do not repeat, and described timing value trace-point method is with trough power value Y
nAs the additional force value at time t
N+1The point position adds described point.
Because the present invention can collect crest and trough that the power value changes, simultaneously it is given the addition record described point, so can reacting the power value of whole measuring process accurately, the graphical recording curve that the present invention obtains changes, and interference-free when data acquisition, strong interference immunity.
Embodiment
Present embodiment, is made comparisons the graphical recording method of force value tests of the present invention and traditional timing described point method in conjunction with graphical record test device by the compressive resistance test experiments to " touching button ", and the relative advantage that the present invention has is described.
Measured target part is for having the button that touches of " Ka Ka " sound action.
Graphical record test device and button special test frame are formed special-purpose button testing machine, stipulate that a test duration is the experiment of single depression power, promptly from button do not have stress to the complete stress of button to getting back to no stress, its main shaft round trip height is limited by button special test frame simultaneously, defines the peak value of maximum weighted state then.
It comprises regularly value trace-point method, timing ergometry value method and additional trace-point method the recording method of present embodiment.
If a test duration is 1.0s, the value of then described timing value trace-point method and described point time T are 1.0s, and the force measurement time t of described timing ergometry value method is 1.0s.
If the value time interval in the described timing value trace-point method and the time interval Δ T of described point are 0.1s, then value time point position and described point time point position are 0.1s, 0.2s, 0.3s, 0.4s, 0.5s, 0.6s, 0.7s, 0.8s, 0.9s, 1.0s.Be less than the value in the described timing value trace-point method and the general requirement of described point time interval Δ T several times according to the force measurement time interval Δ t in the described timing ergometry value method, if the force measurement time interval Δ t in the described timing ergometry value method is 0.01s, the Measuring Time point of then described timing ergometry value method position is 0.01s, 0.02s, 0.03s, 0.04s, 0.05s.........0.98s, 0.99s, 1.0s.According to the Measuring Time of setting, present embodiment actual measurement power value variation diagram as shown in Figure 1.
According to shown in Figure 1, before test duration 0.40S, it is incremental change, i.e. a Y that the power value that continuous acquisition is measured changes
N-1<Y
n<Y
N+1, crest and trough flex point do not appear.The graphical record of force value tests carries out the graphic recording described point by described timing value trace-point method, as the OA section among Fig. 2.
According to shown in Figure 1, between test duration 0.40S-0.42S, three ergometry value Y of described timing ergometry value method continuous acquisition
40, Y
41, Y
42, and Y
40<Y
41, Y
42<Y
41, the explanation of force value has crest to produce at test process, simultaneously, and the time point t that crest produces
41=0.41S, does not repeat the time point position that crest produces and the described point time point position of described timing value trace-point method, and described timing value trace-point method is with crest power value Y
41As the additional force value at time t
42The point position adds described point, and as the point of the B among Fig. 2,0.42S is got in the time point position that B is ordered, and the power value that B is ordered is got the crest power value Y among Fig. 1
41, connecting A, B 2 points, the AB section changes the figure record diagram for additional power value.
According to shown in Figure 1, between test duration 0.47S-0.48S, three ergometry value Y of described timing ergometry value method continuous acquisition
46, Y
47, Y
48, and Y
47<Y
46, Y
47<Y
48, the explanation of force value has trough to produce at test process, simultaneously, and the time point position t that trough produces
47=0.47S, does not repeat the time point position that trough produces and the described point time point position of described timing value trace-point method, and described timing value trace-point method is with trough power value Y
47Give described point as the additional force value, as the point of the C among Fig. 2,0.48S is got in the time point position that C is ordered, and the power value that C is ordered is got the trough power value Y among Fig. 1
47, connecting B, C 2 points, the BC section changes the figure record diagram for additional power value.
According to shown in Figure 1, between test duration 0.48S-0.70S, it is incremental change, i.e. a Y that the power value that continuous acquisition is measured changes
N-1<Y
n<Y
N+1, crest and trough flex point do not appear.The graphical record of force value tests carries out the graphic recording described point by described timing value trace-point method, as the CHD section among Fig. 2.
According to shown in Figure 1, between test duration 0.69S-0.71S, three ergometry value Y of described timing ergometry value method continuous acquisition
69, Y
70, Y
71, and Y
69<Y
70, Y
71<Y
70, the explanation of force value has crest to produce at test process, simultaneously, and the time point position t that crest produces
70=0.7S, at this moment, the time point position that crest produces and the described point time point position 0.7s of described timing value trace-point method repeat, therefore, the power value of this crest writes down described point in described timing value trace-point method, as the point of the D among Fig. 2, no longer carry out the addition record described point.
In like manner, between test duration 0.71S-1.0S, it is a decrement that the power value that continuous acquisition is measured changes, and crest and trough flex point do not occur.The graphical record of force value tests carries out the graphic recording described point by described timing value trace-point method, as the DE section among Fig. 2.
By on learn that the OABCHDE curve is the present invention's graphical record diagram of resulting force measurement in the compressive resistance test experiments of " touching button " is used.
Again as shown in Figure 3, this figure uses the power value change records figure that the single timing value trace-point method of tradition is reflected in the compressive resistance test experiments of " touching button ", though this timing value trace-point method collects the unique crest value (D ' the some position among Fig. 3) in the whole test process, but contrast with the graphical record diagram of present embodiment force measurement (Fig. 2), still lose crest and two flex points of trough (B among Fig. 2, C point position) between 0.4s and 0.5s, made force value tests curve OA ' H ' D ' E ' have " frame losing " phenomenon.