JP2007285997A - Cross-wind test facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cross-wind test facility capable of improving the test accuracy by performing a cross wind test a plurality of times, under substantially identical conditions. <P>SOLUTION: The cross-wind test facility comprises an anemometer 5 for measuring the wind direction and wind speed near a test passage, in a blast band where cross wind is fed by the blower 2; a wind direction/wind speed setting apparatus for setting the wind direction and wind speed of the blower 2; a wind speed variable mechanism for varying the wind speed of the blower 2; a wind direction variable mechanism for varying the wind direction of the blower 2; and a controller for controlling the wind speed variable mechanism and wind direction variable mechanism so that the measured wind speed 14 and measured wind direction 15, measured by the anemometer 5, match with a target wind speed 8 and target wind direction 9 set by the wind direction/wind speed measuring apparatus. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a crosswind test facility for testing aerodynamic characteristics, steering stability, and the like of a traveling test vehicle when it receives a crosswind.

  Conventionally, as a running test of an automobile, the aerodynamic characteristics, steering stability, and the like of the automobile when subjected to a crosswind at a predetermined wind speed while traveling at a predetermined speed have been tested by a crosswind test. This crosswind test is defined in “Automobile-crosswind stability test method (automobile standard JASO Z108)”. According to this regulation, for example, when a test vehicle traveling at a test vehicle speed of 100 km / h receives “a crosswind with an average value of (20 ± 3) m / s in a state where the natural wind is 1 m / s or less”. It is stipulated that tests such as “lateral deviation of a point after 2 seconds”, “maximum yaw angular velocity”, “maximum lateral acceleration”, “roll angle”, and the like.

  The test path for performing this cross wind test is, according to the car standard JASO Z117-1 (test road), “each has straight roads of 100 m or more before and after the blowing zone, and the running road width is 5 m or more before entering the blowing zone and after entering. It shall be 7m or more. " Therefore, it is difficult to install this long test path indoors, and it is usually provided outdoors. As a crosswind test facility provided on this test road, a plurality of fans are arranged side by side to form a blower band having a length of at least 15 m, and travel on a driving reference line set in advance on the test road. It is comprised so that a cross wind may be ventilated at the position of a ventilation zone with respect to the test automobile.

  In the crosswind test by the crosswind test facility, the wind speed from the blower is usually set before running the test vehicle, and after the start of air blowing at the wind direction wind speed, the test vehicle runs in the airflow zone in front of the crosswind test facility. However, behaviors such as aerodynamic characteristics and steering stability when the running test vehicle is subjected to a crosswind are being tested.

As a related technique of this type, a wind tunnel wind speed control device that speeds up the response to fluctuations in pressure loss so that a stable wind speed can be obtained (see, for example, Patent Document 1), and a measurement object. Although there is an omnidirectional wind tunnel device that can provide an air flow that fluctuates at an arbitrary wind direction and speed (see, for example, Patent Document 2), in these techniques, test accuracy is improved in the cross wind test facility according to the present invention. It cannot be improved.
JP 10-123010 A JP 2002-296143 A

  By the way, in the “automobile-crosswind stability test method (automobile standard JASO Z108)”, the natural wind during the test is defined as “the wind speed of the natural wind is 3 m / s or less regardless of the wind direction”. ing. Further, the number of times of the cross wind test is defined as “the number of tests is 5 or more for each vehicle speed”.

  However, as described above, the crosswind test facility provided outdoors is strongly affected by natural wind, and it is difficult to perform a highly accurate test. In addition, since the natural wind changes with time, it may take a long time to perform the test five times when the natural wind is at a wind speed within the specified range.

  Further, even if the same crosswind test is performed 5 times when the wind speed of the natural wind is within the specified range, an error within the specified range is unavoidable. Therefore, in order to improve accuracy, the test is performed 5 times under substantially the same conditions. It is difficult to perform a crosswind test.

  Accordingly, an object of the present invention is to provide a cross wind test facility capable of improving the test accuracy by performing a cross wind test a plurality of times under substantially the same conditions.

  In order to achieve the above-mentioned object, the present invention provides a blower equipped with a drift device for drifting the wind direction of the blower outlet in a test path, blows a cross wind to a test automobile running on the blower, In a cross wind test facility for testing cross wind stability, a wind direction anemometer that measures the wind direction wind speed in the vicinity of a test path in a blow zone that blows cross wind with the blower, and a wind direction and wind speed setting device that sets the wind direction and wind speed of the blower, The wind direction variable mechanism that makes the wind speed of the blower variable, the wind direction variable mechanism that makes the wind direction of the blower variable, and the wind direction wind speed signal measured by the wind direction anemometer coincide with the wind direction wind speed set by the wind direction wind speed measuring device. Thus, a control device for controlling the wind speed variable mechanism and the wind direction variable mechanism is provided. The control by this control device is feedback control, whereby feedback control is performed so that the wind direction wind speed for the test vehicle set by the wind direction wind speed setting device matches the wind direction wind speed actually measured by the wind direction anemometer, and the influence of natural wind is exerted. Corrected accurate crosswind test can be performed. And since the reproducibility improvement of the wind direction wind speed in a cross wind test can be aimed at, the efficient test which raised the test precision can be implemented.

  In addition, a position detector for detecting that the test automobile has entered the ventilation zone is provided, and based on a detection signal of the position detector, a wind direction wind speed signal of the wind direction anemometer and a wind direction wind speed measuring device by the control device The control device may be provided with a function of restricting control to match the set wind direction and wind speed. As a result, if the position detector detects that the test vehicle has entered the blower zone (cross wind test position), the wind speed of the cross wind from the blower is kept constant, and the natural wind is disturbed by the influence of the test vehicle that passes through and controlled. The test accuracy can be improved by avoiding the influence on the test.

  Further, the wind direction and wind speed setting device is provided with a function of setting the wind direction and wind speed at a virtual position on the running reference line of the test road on which the test vehicle travels, and the wind direction and wind speed set by the wind direction and wind speed setting device are included in the wind direction and anemometer. You may provide the wind direction wind speed corrector which converts into the wind direction wind speed command in a position. This allows the wind direction and wind speed detected at the virtual position on the travel reference line to be converted from the wind direction and wind speed detected by the wind direction anemometer to control the wind direction and wind speed at the virtual position, and the more accurate crosswind test of the test vehicle traveling on the travel reference line Can do. In addition, the wind direction and wind speed can be accurately controlled without installing an anemometer near the test path.

  According to the present invention, it is possible to provide a crosswind test facility capable of performing a highly accurate crosswind test while suppressing the influence of natural wind by means as described above.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view in plan view of the crosswind test facility according to the first embodiment of the present invention. 2 is a block diagram showing a correction control method of the wind direction and wind speed in the cross wind test facility shown in FIG. 1, and FIGS. 3 (a) to 3 (d) show the principle of correction of the wind direction and wind speed in the cross wind test facility shown in FIG. It is explanatory drawing.

  As shown in the drawing, a cross wind test facility 1 is provided at a predetermined position on a test road R on which the test vehicle M travels. The width of the test road R is wide as described above from the position where the cross wind test facility 1 is provided. Is formed. The cross wind test facility 1 includes a plurality of (five in the figure) blowers 2 arranged in parallel in the horizontal direction, and is configured to blow a cross wind at a predetermined wind speed toward the test path R from these blowers 2. ing. In this embodiment, the wind speed variable mechanism is configured to make the wind speed variable by controlling the rotational speed of the blower 2 (for example, inverter control).

  Moreover, the drift device 3 which is a wind direction variable mechanism is provided in the test path side of the cross wind test equipment 1, and it is comprised so that the wind direction of the air blower 2 can be changed. As the drifting device 3, a louver 4 is provided vertically on the test road side, and the louver 4 is rotated about a vertical axis so that the horizontal wind direction can be changed. The wind direction wind speed of the cross wind W by the blower 2 is a wind direction wind speed desired by the tester, and is set in advance.

  In the cross wind test facility 1, a wind direction anemometer 5 for measuring the wind direction and the wind speed of the cross wind W blown from the louver 4 is provided in the vicinity of the test path R. The anemometer 5 is preferably provided at a position close to the test road R and close to the travel line of the test automobile M.

  In this embodiment, a position detector 6 for detecting the passage of the test vehicle M is provided near the entrance of the cross wind test facility 1. As the position detector 6, for example, an optical sensor or an image sensor may be used as long as it can detect that the test vehicle M traveling on the test road R has entered the side of the cross wind test facility 1. In the figure, a position detector 6 is provided on the test vehicle inrush line of the crosswind test facility 1 (inlet side end portion of the crosswind test facility 1). The position detector 6 has a center of gravity from the front end of the test vehicle M. It may be provided in the vicinity of the entry point on the upstream side by the distance up to, and may be in the vicinity of the entrance side of the crosswind test facility 1.

  Further, in the cross wind test facility 1, the rotational speed control of the blower 2 and the angle control of the drift device 3 are performed, and the rotational speed of the blower 2 and the angle control of the drift device 3 are controlled from the detected value of the wind direction anemometer 5. A control device 7 is provided. In this figure, the control device 7 is provided close to the crosswind test facility 1, but the control device 7 may be provided in an operation room (not shown) or the like apart from the crosswind test facility 1.

  As shown in FIG. 2, as the correction control of the wind direction and wind speed of the cross wind test facility 1, a target wind speed 8 and a target wind direction for performing a cross wind test on a wind direction and wind speed setter (not shown because it is included in the control device 7) in advance 9 is set, converted to the rotational speed of the blower 2 so as to be the target wind speed 8, and converted into the angle of the drift device 3 so as to be the target wind direction 9. Each of the converted values is output to the blower 2 as the blower rotation speed command 12 and is also output to the drift device 3 as the drift device angle command 13. The cross wind W blown in a predetermined wind direction at a predetermined wind speed by these commands is actually measured by the wind direction anemometer 5. The cross wind W measured by the wind direction anemometer 5 is a composite wind of the forced wind and the natural wind generated by the blower 2. The wind speed is feedback-controlled as the measured wind speed 14, and the wind direction is feedback-controlled as the measured wind direction 15. . The measurement-controlled wind speed 14 and the measurement wind direction 15 that are feedback-controlled are compared with the target wind speed 8 and the target wind direction 9 by the comparison units 16 and 17 and corrected. These corrections are performed by the control device 7.

  As shown in FIGS. 3 (a) to 3 (d), the cross wind W corrected by the cross wind test facility 1 in this way is the forced wind W 1 (thick solid line) blown from the cross wind test facility 1 and the test path R. It becomes the combined wind W3 (dotted line) with the natural wind W2 (thin solid line). The composite wind W3 is feedback-controlled from the wind speed and the wind direction measured by the wind direction anemometer 5 so that the composite wind W3 becomes the target wind speed 8 and the target wind direction 9. (A) and (d), (b) and (c) shown in the figure show examples in which the influence of the natural wind is symmetric. When there is such a natural wind W2, the air is blown from the cross wind test facility 1. If the forced wind W1 is made symmetrical as shown in the figure, the target synthesized wind W3 can be made the same.

  FIG. 4 is a block diagram showing a correction control method for the wind direction and wind speed in the cross wind test facility according to the second embodiment of the present invention. As described above, the position detector 6 is provided near the entrance of the crosswind test facility 21 of this embodiment to detect that the test vehicle M has passed through the test path R and has reached the blower zone. The crosswind test facility 21 according to the second embodiment performs correction control of the wind direction and wind speed using the position detector 6, and the turbulence of the air by the test automobile M passing through the blast zone in front of the crosswind test facility 21. The natural wind is disturbed by the influence, and the disturbance of the natural wind is avoided to adversely affect the controllability. The same components as those in the first embodiment will be described with the same reference numerals.

  As shown in the figure, the signal of the vehicle position detection 22 of the test vehicle M detected by the position detector 6 is output to the timer 23 and is output from the timer 23 to signal hold processing 24 and 25.

  On the other hand, also in the cross wind test facility 21 of this embodiment, the target wind speed 8 and the target wind direction 9 for performing the cross wind test are set in advance and become the target wind speed 8 as in the first embodiment. 10 is converted into the rotational speed of the blower 2 and 11 is converted into the angle of the drift device 3 so that the target wind direction 9 is obtained. Each of the converted values is output to the blower 2 as the blower rotation speed command 12 and is also output to the drift device 3 as the drift device angle command 13. The cross wind W blown in a predetermined wind direction at a predetermined wind speed by these commands is measured by the wind direction anemometer 5. The cross wind W measured by the wind direction anemometer 5 is a composite wind of the forced wind and the natural wind generated by the blower 2. The wind speed is feedback-controlled as the measured wind speed 14, and the wind direction is feedback-controlled as the measured wind direction 15. . The measurement-controlled wind speed 14 and the measurement wind direction 15 that are feedback-controlled are compared with the target wind speed 8 and the target wind direction 9 by the comparison units 16 and 17 and corrected.

  The signal hold processes 24 and 25 are provided in the circuit of the measurement wind speed 14 and the measurement wind direction 15 that are feedback-controlled. By providing signal hold processing 24 and 25 in the circuit of the measurement wind speed 14 and the measurement wind direction 15, when the vehicle position detection 22 detects that the test automobile M has approached the blowing zone of the cross wind test facility 21, the timer 23 The signal hold processing 24, 25 is performed for a predetermined time with this signal. Therefore, the test vehicle M is tested by the wind speed and the wind direction set before passing through the air blowing zone in front of the cross wind test facility 21, and the natural wind is disturbed by the influence of the air disturbed by the travel of the test vehicle M. Thus, adverse effects on controllability can be prevented. In other words, when the test vehicle M passes through the blast zone, the test vehicle M holds the measured wind speed and direction before passing through the blast zone of the cross wind test facility 21 to make it insensitive to disturbance, and the natural wind turbulence. The influence on the controllability by is eliminated. Therefore, in the case of this embodiment, it is particularly effective in the case where the surrounding air is disturbed by the test vehicle M traveling like a large vehicle.

  FIG. 5 is a schematic diagram in plan view of the crosswind test facility according to the third embodiment of the present invention. FIG. 6 is a schematic diagram for explaining the position conversion by the wind direction wind speed correction control method in the cross wind test facility shown in FIG. 5, and FIG. 7 is a block diagram showing the wind direction wind speed correction control method shown in FIG. It is. In this embodiment as well, the same components as those in the first embodiment will be described with the same reference numerals.

  As shown in FIG. 5, the cross wind test facility 1, 21 in the first and second embodiments has a cross wind W for a test vehicle M traveling on a travel reference line C set in advance on the test road R. Correction is made by a wind direction and wind speed signal measured by an anemometer 5 provided in the vicinity of R. However, since the wind blown from the predetermined opening is gradually attenuated, the cross wind W is blown to the test vehicle M running on the running reference line C of the test path R with an accurate target wind speed and target wind direction. Not necessarily.

Therefore, as shown in FIG. 6, in the cross wind test facility 31 of this embodiment, the wind direction and wind speed at the virtual position 32 on the travel reference line C are converted into the wind direction and wind speed at the position of the wind direction anemometer 5, thereby Wind direction and wind speed control at a position different from the position of the anemometer 5 is possible. In this figure, the outlet 33 of the cross wind test facility 31 on the extension line of the wind direction from the virtual position 32 and the anemometer 5 is set as the reference points (x ₁₀ , y ₁₀ ), (x ₂₀ , y ₂₀ ), and the reference point The distance from (x ₁₀ , y ₁₀ ) to the position (x ₁ , y ₁ ) where the wind direction anemometer 5 is provided is l _1, and the wind direction wind speed on the travel reference line C from the reference point (x ₂₀ , y ₂₀ ) A case will be described in which the distance to the virtual position 32 (x ₂ , y ₂ ), which is the adjustment position, is l ₂ and correction is performed.

Since the cross wind W blown from the blower 2 becomes a jet, it attenuates when it leaves the blower outlet 33. This cross wind W is considered to be a two-dimensional free jet that spreads in the horizontal direction, and the maximum velocity of the two-dimensional free jet is shown in [Equation 1] below in the mechanical engineering manual. In this equation, u ₀ : outlet wind speed, u _m : maximum wind speed at a desired position, λ: coefficient obtained experimentally, d: tube diameter, l: distance.

Then, the wind speed um in the formula [1] is set as the wind speed at a desired position, and the wind direction on the travel reference line C is calculated by the formula [1] and the following formula [2] which is a distance formula. The wind speed u ₁ at the position (x ₁ , y ₁ ) of the anemometer 5 for obtaining a desired wind speed u ₂ at the wind speed adjustment position (x ₂ , y ₂ ) is obtained by the following equation (3). In the equation (2), “l” is “l ₁ ” “l ₂ ”, and “x ² + y ² ” is “x ₁ ² + y ₁ ² ” “x ₂ ² + y ₂ ² ”.

However, in actuality, since the ideal free jet as in theory does not occur, the function of the distance l is converted into the wind direction / wind speed adjustment position (x ₂ , y ₂ ) on the traveling reference line C by the following [Equation 4]. And a reference value (x ₂₀ , y ₂₀ ) may be created from actual measurement values measured at a plurality of points.

According to the cross wind test facility 31 of the third embodiment as described above, the wind direction and wind speed adjustment position (x ₂ , y ₂ ) on the travel reference line C of the test vehicle M and the position of the wind direction anemometer 5 (x ₁ , y ₁ ) and the reference point (x ₁₀ , y ₁₀ ), (x ₂₀ , y ₂₀ ) that is the outlet 33 of the cross wind test facility 31, the wind direction wind speed position converted value is obtained.

As shown in FIG. 7, the calculated wind direction wind speed position converted value is obtained by a wind direction wind speed position conversion 34 as a wind direction wind speed corrector to obtain a target wind speed 38 at a wind direction wind speed adjustment position at a preset virtual position 32. It is converted to such wind speed. That is, according to the wind direction / wind speed position conversion 34, the wind direction / wind speed adjustment position (x ₂ , y ₂ ) on the travel reference line C located at a position away from the cross wind test facility 31 is the preset wind direction / wind speed adjustment position. The wind speed is converted so that the target wind speed 38 is obtained. Further, the target wind direction 39 at the wind direction / wind speed adjustment position is also input to the wind direction / wind speed position conversion 34, and the wind speed considering the wind direction data is determined.

  Then, the rotational speed of the blower 2 is converted to 10 so that the target wind speed 38 converted by the wind direction / wind speed position conversion 34 is obtained, and the angle of the drift device 3 is set to the target wind direction 39 at the wind direction / wind speed adjustment position. Conversion 11 is performed. Each of the converted values is output to the blower 2 as the blower rotation speed command 12 and is also output to the drift device 3 as the drift device angle command 13. The cross wind W blown in a predetermined wind direction at a predetermined wind speed by these commands is measured by the wind direction anemometer 5. The cross wind W measured by the wind direction anemometer 5 is a composite wind of the forced wind and the natural wind generated by the blower 2. The wind speed is feedback-controlled as the measured wind speed 14, and the wind direction is feedback-controlled as the measured wind direction 15. . The feedback-controlled measured wind speed 14 and measured wind direction 15 are compared by the comparison units 16 and 17 with the target wind speed 38 converted by the wind direction wind speed position conversion 34 and the target wind direction 39 at the wind direction and wind speed adjustment position, respectively. Is corrected.

  In each of the above embodiments, the wind speed variable mechanism that changes the wind speed by controlling the rotation speed of the blower 2 has been described as an example. However, a throttle is provided on the suction side of the blower 2, and the wind speed is controlled by controlling the throttle. In addition, the air blower 2 may be provided with variable pitch blades, and the wind speed may be varied by changing the pitch of the blades. It is not limited to the form. Furthermore, in any of the above-described embodiments, the wind direction variable mechanism that changes the wind direction using the louver 4 of the blower 2 has been described as an example. However, any configuration that can change the wind direction from the blower 2 may be used. It is not limited.

  Further, the above-described embodiment shows an example, and various modifications can be made without departing from the gist of the present invention, and the present invention is not limited to the above-described embodiment.

  The crosswind test facility according to the present invention is useful when performing a more stable crosswind test on a test vehicle.

It is a mimetic diagram of the plane view of the crosswind test equipment concerning a 1st embodiment of the present invention. It is a block diagram which shows the correction | amendment control system of the wind direction wind speed in the cross wind test equipment shown in FIG. (a)-(d) is explanatory drawing of the correction | amendment principle of the wind direction wind speed in the crosswind test equipment shown in FIG. It is a block diagram which shows the correction | amendment control system of the wind direction wind speed in the crosswind test equipment which concerns on 2nd Embodiment of this invention. It is a schematic diagram of the planar view of the crosswind test equipment which concerns on 3rd Embodiment of this invention. It is a schematic diagram of the planar view explaining the position conversion by the correction | amendment control system of the wind direction wind speed in the cross wind test equipment shown in FIG. It is a block diagram which shows the correction | amendment control system of the wind direction wind speed shown in FIG.

Explanation of symbols

1 ... Crosswind test facility
2 ... Blower
3 ... Diffusion device
4 ... Louvre
5 ... Wind anemometer
6 ... Position detector
7. Control device
8 ... Target wind speed
DESCRIPTION OF SYMBOLS 9 ... Target wind direction 10 ... Blower rotation speed conversion 11 ... Diffusion apparatus angle conversion 12 ... Blower rotation speed command 13 ... Diffusion apparatus angle command 14 ... Measurement wind speed 15 ... Measurement wind direction 16, 17 ... Comparison part 21 ... Cross wind test equipment 22 ... Car Position detection 23 ... Timer 24, 25 ... Signal hold processing 31 ... Cross wind test facility 32 ... Virtual position 33 ... Outlet 34 ... Wind direction / wind speed position conversion 38 ... Target wind speed at wind direction / wind speed adjustment position 39 ... Target at wind direction / wind speed adjustment position Wind direction
M ... Test car
R ... Test path
C ... Running reference line
W ... Cross wind W1 ... Forced wind W2 ... Natural wind W3 ... Synthetic wind

Claims (3)

In the crosswind test facility for installing a blower equipped with a drift device for drifting the wind direction of the blowout outlet in the test path, blowing a crosswind to a test vehicle running on the blower, and testing the crosswind stability of the test vehicle,
A wind direction anemometer that measures the wind direction wind speed in the vicinity of a test path in a blower zone that blows cross wind with the blower, a wind direction wind speed setter that sets the wind direction wind speed of the blower, and a wind speed variable mechanism that makes the wind speed of the blower variable A wind direction variable mechanism that makes the wind direction of the blower variable, and the wind direction variable mechanism and the wind direction variable mechanism so that the wind direction wind speed signal measured by the wind direction anemometer matches the wind direction wind speed set by the wind direction wind speed measuring device. A crosswind test facility characterized by comprising a control device for controlling the wind.   A position detector for detecting that the test automobile has entered the ventilation zone is provided, and the wind direction wind speed signal of the wind direction anemometer by the control device and the wind direction wind speed measuring device are set based on the detection signal of the position detector. The cross wind test facility according to claim 1, wherein the control device is provided with a function of restricting control to match the wind direction and wind speed.   The wind direction and wind speed setting device is provided with a function of setting the wind direction and wind speed at a virtual position on the running reference line of the test road on which the test vehicle travels, and the wind direction and wind speed set by the wind direction and wind speed setting device are provided at the position of the wind direction and anemometer. The crosswind test facility according to claim 1 or 2, further comprising a wind direction and wind speed corrector that converts the wind direction and wind speed command.

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