TW202030028A - Sandstorm suppressor - Google Patents

Sandstorm suppressor Download PDF

Info

Publication number
TW202030028A
TW202030028A TW108104847A TW108104847A TW202030028A TW 202030028 A TW202030028 A TW 202030028A TW 108104847 A TW108104847 A TW 108104847A TW 108104847 A TW108104847 A TW 108104847A TW 202030028 A TW202030028 A TW 202030028A
Authority
TW
Taiwan
Prior art keywords
sandstorm
frequency
suppressor
sand
data
Prior art date
Application number
TW108104847A
Other languages
Chinese (zh)
Inventor
王陌阡
Original Assignee
王陌阡
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 王陌阡 filed Critical 王陌阡
Priority to TW108104847A priority Critical patent/TW202030028A/en
Priority to CN201910242552.6A priority patent/CN109946764A/en
Publication of TW202030028A publication Critical patent/TW202030028A/en

Links

Images

Landscapes

  • Geophysics And Detection Of Objects (AREA)

Abstract

A sandstorm suppressor is disclosed in the present invention. The sandstorm suppressor suppresses the sandstorm caused by the low frequency vibration of the crust. The sandstorm suppressor includes a receiving unit, a processing unit and a plurality of frequency generating units. The processing unit calculates the signals received via the receiving unit and generates the corresponding frequency signals outputted to the frequency generating units. The frequency generating units generate the specific vibration waves according to the frequency signals. The vibration waves are destructive interfering to the resonance waves of the sands resonant with the low frequency vibration of the crust. The sandstorm suppressor of the present invention can prevent the occurrence of the sandstorm via detecting the in-time environmental conditions including weather, area and geology. The sandstorm can be avoided efficiently via the destructive interfering waves generated via the sandstorm suppressor of the present invention.

Description

沙塵暴抑制器 Sandstorm suppressor

本發明係揭露一種抑制器,尤其是有關於一種沙塵暴抑制器,其係根據地域、氣候等環境因素的資料,精密計算出該區域的地殼振動頻率,並產生出與之對應的破壞性干涉振動波,俾以避免沙塵因共振而產生沙塵暴。 The present invention discloses a suppressor, especially related to a sandstorm suppressor, which accurately calculates the crustal vibration frequency in the region based on environmental factors such as geographic area and climate, and generates corresponding destructive interference vibrations Wave, in order to avoid sandstorms due to resonance.

沙塵暴為沙暴與塵暴的總稱,此一天氣現象多發生在乾旱或半乾旱的地區,發生沙塵暴時,係主要由強風颳起乾燥地表上的鬆軟沙土和塵埃形成,其導致空氣混濁,能見度變低。不過一般來說,形成沙塵暴的條件有以下幾個:第一是地面上的沙塵物質,它是形成沙塵暴的物質基礎;第二是強大風,這是沙塵暴傳送的動力;第三是旺盛的熱對流,這是重要的局地熱力條件;第四是乾旱的氣候環境,比起濕黏的泥土,乾燥的沙塵更容易在上述的條件下產生沙塵暴;第五則是地殼持續的低頻振動而導致沙塵發生共振。基於上述可知,在乾燥的環境下,由於沙塵缺乏水分、團聚的顆粒少、重量較輕等因素,使得沙塵隨著地殼的低頻振動而逐漸形成大量共振的沙塵,因此漂浮在地表上的沙塵量逐漸增加,一旦在強的熱對流條件下,藉由熱對流提供了沙塵足夠的浮力,瞬間便會揚起大量的沙塵,並在強風的吹送之下,便形成了大規模、大區域的沙塵暴。 Sandstorm is the general term for sandstorms and duststorms. This weather phenomenon mostly occurs in arid or semi-arid areas. When a sandstorm occurs, it is mainly formed by strong winds blowing up the soft sand and dust on the dry surface, which causes the air to become turbid and reduce visibility. . However, in general, the conditions for the formation of a dust storm are as follows: the first is the dust material on the ground, which is the material basis for the formation of the dust storm; the second is strong wind, which is the driving force for the transmission of the dust storm; the third is strong Thermal convection, which is an important local thermal condition; the fourth is arid climate, compared to wet and sticky soil, dry sand and dust are more likely to produce sandstorms under the above conditions; the fifth is the continuous low-frequency vibration of the earth's crust This causes the dust to resonate. Based on the above knowledge, in a dry environment, due to the lack of moisture, less agglomerated particles, and lighter weight, the dust gradually forms a large amount of resonant dust with the low-frequency vibration of the earth's crust, so it floats on the surface The amount of sand and dust gradually increases. Once under strong thermal convection conditions, the thermal convection provides sufficient buoyancy for the sand and dust, and a large amount of sand and dust will be raised instantly, and under the strong wind, a large amount of dust will be formed. Large-scale and large-scale sandstorms.

然而上述的各種條件中,沙塵、強風、強烈熱對流、乾燥氣候及地殼振動,看似沒有任何一個條件可以輕易地受到控制,更無法在短時間內 有效地解決沙塵暴發生的問題。有鑑於上述,本發明揭露一種沙塵暴抑制器,其係根據地域、氣候等環境因素的資料,精密計算出該區域的地殼振動頻率,並產生出與之對應的破壞性干涉振動波,俾以避免沙塵因共振而產生沙塵暴。 However, among the above-mentioned various conditions, sand dust, strong winds, strong thermal convection, dry climate and vibration of the earth's crust, it seems that none of the conditions can be easily controlled, and it cannot be controlled in a short time. Effectively solve the problem of sandstorms. In view of the above, the present invention discloses a dust storm suppressor, which accurately calculates the crustal vibration frequency of the region based on the data of environmental factors such as region and climate, and generates corresponding destructive interference vibration waves to avoid Sand and dust generate sandstorms due to resonance.

本發明之主要目的乃在於提供一種沙塵暴抑制器,其係根據地域、氣候等環境因素的資料,精密計算出該區域的地殼振動頻率,並產生出與之對應的破壞性干涉振動波,俾以避免沙塵因共振而產生沙塵暴。 The main purpose of the present invention is to provide a dust storm suppressor, which accurately calculates the crustal vibration frequency of the region based on the environmental factors such as region and climate, and generates corresponding destructive interference vibration waves, so as to Avoid sandstorms due to resonance.

本發明之另一目的乃在於提供一種沙塵暴抑制器,其係可依據時間資料、地圖資料、地形資料、地質資料、溫度資料、濕度資料、氣壓資料來運算出適當的振動波,其中由不同的頻率產生單元所產生的振動波可具有不同的頻率區間。 Another object of the present invention is to provide a dust storm suppressor, which can calculate appropriate vibration waves based on time data, map data, topographic data, geological data, temperature data, humidity data, and air pressure data. The vibration waves generated by the frequency generating unit may have different frequency ranges.

本發明之再一目的乃在於提供一種沙塵暴抑制器,其係利用陣列型態排列、線性型態排列、同心圓型態排列、不規則型態排列或上述型態之組合的複數個頻率產生單元,再搭配上特定角度以將振動波進行傳送,以在依定區域範圍內可達到完全抑制沙塵共振的效果。 Another object of the present invention is to provide a dust storm suppressor, which utilizes a plurality of frequency generating units arranged in an array pattern, a linear pattern arrangement, a concentric pattern arrangement, an irregular pattern arrangement or a combination of the above types , Coupled with a specific angle to transmit the vibration wave, in order to achieve the effect of completely suppressing the resonance of sand and dust within the specified area.

為達上述目的,本發明係揭露一種沙塵暴抑制器,其係用以抑制沙塵因地殼低頻振動而產生共振,本發明揭露的沙塵暴抑制器包含一接收單元,接收複數個訊號;一處理單元,耦接該接收單元,並在運算該些訊號後輸出複數個頻率訊號;以及複數個頻率產生單元,耦接該處理單元,並產生具有該些頻率訊號的複數個振動波;其中,該些頻率產生單元產生的該些振動波係與沙塵的共振波互為破壞性干涉。 To achieve the above objective, the present invention discloses a sand and dust storm suppressor, which is used to suppress sand and dust from resonating due to low-frequency vibration of the earth's crust. The sand and dust storm suppressor disclosed in the present invention includes a receiving unit for receiving a plurality of signals; a processing unit, Coupled to the receiving unit, and outputting a plurality of frequency signals after calculating the signals; and a plurality of frequency generating units, coupled to the processing unit, and generating a plurality of vibration waves having the frequency signals; wherein, the frequencies The vibration waves generated by the generating unit and the resonance waves of the sand dust interfere destructively with each other.

是以,本發明揭露的沙塵暴抑制器以手動輸入或資料擷取的方式,載入即時的時間資料、地圖資料、地形資料、地質資料、溫度資料、濕度資料、氣壓資料,經過運算處理後產生一連串不同頻率的振動波,藉由頻率產生單元的排列,並同時搭配振動波傳送的特定角度,以產生出與地殼振動所引發的沙塵共振對應的破壞性干涉波,俾以避免沙塵因共振而產生沙塵暴。 Therefore, the sand and dust storm suppressor disclosed in the present invention loads real-time time data, map data, topographic data, geological data, temperature data, humidity data, and air pressure data by manual input or data acquisition, and generates it after processing A series of vibration waves of different frequencies are arranged by the frequency generating unit and matched with the specific angle of the vibration wave transmission to generate destructive interference waves corresponding to the sand and dust resonance caused by the vibration of the earth's crust, so as to avoid sand and dust. Resonance produces sandstorms.

1‧‧‧沙塵暴抑制器 1‧‧‧Sandstorm suppressor

12‧‧‧接收單元 12‧‧‧Receiving unit

14‧‧‧處理單元 14‧‧‧Processing unit

16、16a-16f‧‧‧頻率產生單元 16, 16a-16f‧‧‧frequency generating unit

第1圖係為本發明揭露之一種沙塵暴抑制器的方塊示意圖。 Figure 1 is a block diagram of a sandstorm suppressor disclosed in the present invention.

第2a圖係為本發明揭露之一種沙塵暴抑制器的裝置態樣。 Figure 2a shows the device aspect of a sandstorm suppressor disclosed in the present invention.

第2b圖係為本發明揭露之另一種沙塵暴抑制器的裝置態樣。 Figure 2b shows another device aspect of the sandstorm suppressor disclosed in the present invention.

本發明所採用之技術手段及其構造,茲繪圖就本發明之較佳實施例詳加說明其特徵與功能如下,俾利完全瞭解。 The technical means and structure adopted by the present invention are illustrated in detail below to illustrate the features and functions of the preferred embodiments of the present invention for a complete understanding.

請同時參照第1圖、第2a圖及第2b圖所示,其中第1圖為本發明揭露之一種沙塵暴抑制器的方塊示意圖、第2a圖為本發明揭露之一種沙塵暴抑制器的裝置態樣、第2b圖為本發明揭露之另一種沙塵暴抑制器的裝置態樣。 Please refer to Figure 1, Figure 2a and Figure 2b at the same time. Figure 1 is a block diagram of a sandstorm suppressor disclosed in the present invention, and Figure 2a is a device configuration of a sandstorm suppressor disclosed in the present invention. , Figure 2b is another device aspect of the sandstorm suppressor disclosed in the present invention.

在本發明揭露的沙塵暴抑制器1中包含一接收單元12、一處理單元14以及複數個頻率產生單元16a-16f。接收單元12用以接收複數個訊號;處理單元14耦接於接收單元12,接收來自接收單元12所傳輸出來的訊號後,經過處理單元14的運算後,輸出複數個與該些訊號對應的頻率訊號;複數個頻率產生單元16a-16f則耦接於處理單元14,並根據來自處理單元14運算後得到的頻率訊號,以產生具有該些頻率的複數個振動波;其中,頻率產生單元16a-16f產生的振動波係與沙塵的共振波互為破壞性干涉。當然,為了提供足夠的 電能,本發明的沙塵暴抑制器1更包含了一電能供應單元(圖未顯示),耦接於接收單元12、處理單元14及該些頻率產生單元16a-16f,其中電能供應單元可為任何型態的儲電元件,像是鋰電池、太陽能電池或任何一次或二次電池。 The sandstorm suppressor 1 disclosed in the present invention includes a receiving unit 12, a processing unit 14, and a plurality of frequency generating units 16a-16f. The receiving unit 12 is used to receive a plurality of signals; the processing unit 14 is coupled to the receiving unit 12, and after receiving the signals transmitted from the receiving unit 12, the processing unit 14 outputs a plurality of frequencies corresponding to the signals A plurality of frequency generating units 16a-16f are coupled to the processing unit 14, and generate a plurality of vibration waves having these frequencies according to the frequency signals obtained after calculation from the processing unit 14; wherein, the frequency generating unit 16a- The vibration wave system generated by 16f and the resonance wave of sand and dust interfere with each other destructively. Of course, in order to provide enough For electrical energy, the sandstorm suppressor 1 of the present invention further includes an electrical energy supply unit (not shown in the figure), which is coupled to the receiving unit 12, the processing unit 14 and the frequency generating units 16a-16f. The electrical energy supply unit can be of any type. State-of-the-art storage elements, such as lithium batteries, solar batteries, or any primary or secondary batteries.

上述由接收單元12接收的訊號可包含有時間資料、地圖資料、地形資料、地質資料、溫度資料、濕度資料、氣壓資料...等,且接收的方法包含有手動輸入、資料庫輸入、擷取雲端數據及/或接收衛星訊號...等方法。由此可知,本發明的沙塵暴抑制器1可根據最即時的資訊,甚至臨時發生緊急天候狀況變化的情況下,仍可在第一時間擷取最即時更新的資料,以做為資訊處理的素材,對於沙塵暴的預警與防治,實為最有效、最可靠的設備。 The above-mentioned signal received by the receiving unit 12 may include time data, map data, topographic data, geological data, temperature data, humidity data, air pressure data, etc., and the receiving methods include manual input, database input, and capture. Get cloud data and/or receive satellite signals...etc. It can be seen that the sandstorm suppressor 1 of the present invention can capture the most real-time updated data at the first time based on the most real-time information, even in the event of a temporary emergency weather change, and use it as the material for information processing. , It is the most effective and reliable equipment for the early warning and prevention of sandstorms.

一般而言,雖然全球各地發生沙塵暴的地域及對應的天候,實際上的自然條件都有些許的不同,不過本發明揭露的沙塵暴抑制器1可提供的頻率訊號係介於0.01~500Hz之間的頻率。舉例來說,在實驗室中模擬戈壁沙漠春季環境中的氣候條件下,頻率訊號的頻率範圍大約在1.0~5Hz之間即有顯著的抑制共振效果,不過這個頻率的範圍除了跟上述的天候條件有關,也與欲抑制的範圍(面積)有關聯,因此,雖然實驗是以特定的地質搭配特定的天候條件進行,但在實際應用時,仍須考量實際操作的區域大小來改變頻率訊號的頻率範圍。 Generally speaking, although the regions and corresponding weather conditions where sandstorms occur around the world, the actual natural conditions are slightly different, but the frequency signal provided by the sandstorm suppressor 1 disclosed in the present invention is between 0.01 and 500 Hz. frequency. For example, under the climatic conditions in the spring environment of the Gobi Desert in the laboratory, the frequency range of the frequency signal is about 1.0~5Hz, which has a significant resonance suppression effect, but this frequency range is in addition to the above-mentioned weather conditions. It is also related to the range (area) to be suppressed. Therefore, although the experiment is carried out under specific geological conditions with specific weather conditions, in actual applications, the actual operating area size must be considered to change the frequency of the frequency signal. range.

為能夠產生上述的頻率訊號,通常而言,頻率產生單元16a-16f的功率介於1~200W,且根據需求,每個頻率產生單元16a-16f在做動的時候,可能會產生出不同頻率的振動波,同時也會搭配不同的功率以將振動波傳送到特定距離。 In order to be able to generate the above-mentioned frequency signals, generally speaking, the power of the frequency generating units 16a-16f is between 1~200W, and according to requirements, each frequency generating unit 16a-16f may generate different frequencies when it is activated. At the same time, different powers will be used to transmit the vibration wave to a certain distance.

在整體的元件配置上,主要對外發送振動波的頻率產生單元16可以陣列型態排列、線性型態排列、同心圓型態排列、不規則型態排列或上述型態之組合,同時,為了提高振動波傳送的效率,頻率產生單元16更可以特 定角度傳送振動波,所述的特定角度可以是不可變的,例如:根據特定區域的需求,頻率產生單元16的設置即為具有一定角度的,或是特定角度也可以是可調整的,例如:頻率產生單元16本身為一個具有可轉動、可扭動的機構設計,因此可根據每一次不同的輸入條件而改變振動波傳送的角度。在第2a圖與第2b圖則分別顯示出具有陣列型態排列的頻率產生單元16,且每個頻率產生單元16的頻率範圍、功率及振動波傳出角度,都不相同。 In the overall component configuration, the frequency generating unit 16 that mainly transmits vibration waves to the outside can be arranged in an array pattern, a linear pattern, a concentric pattern, an irregular pattern, or a combination of the above patterns. At the same time, in order to improve The efficiency of vibration wave transmission, the frequency generating unit 16 can be more special The vibration wave is transmitted at a fixed angle, and the specific angle may be immutable. For example, according to the needs of a specific area, the setting of the frequency generating unit 16 has a certain angle, or the specific angle may also be adjustable, for example : The frequency generating unit 16 itself is a rotatable and twistable mechanism design, so the transmission angle of the vibration wave can be changed according to different input conditions each time. Fig. 2a and Fig. 2b respectively show the frequency generating units 16 arranged in an array type, and the frequency range, power and vibration wave transmission angle of each frequency generating unit 16 are different.

承上所述可知,本發明揭露的沙塵暴抑制器,係根據地域、氣候等環境因素的資料,即時且精密計算出該區域的地殼振動頻率,並產生出與之對應的破壞性干涉振動波,俾以避免沙塵因共振而產生沙塵暴。 From the foregoing, it can be seen that the sand and dust storm suppressor disclosed in the present invention is based on environmental factors such as region, climate, etc., to instantly and accurately calculate the crustal vibration frequency of the region, and generate corresponding destructive interference vibration waves. To avoid sandstorms due to resonance.

12‧‧‧接收單元 12‧‧‧Receiving unit

14‧‧‧處理單元 14‧‧‧Processing unit

16a-16f‧‧‧頻率產生單元 16a-16f‧‧‧frequency generating unit

Claims (9)

一種沙塵暴抑制器,係用以抑制沙塵因地殼低頻振動而產生共振,該沙塵暴抑制器包含:一接收單元,接收複數個訊號;一處理單元,耦接該接收單元,並在運算該些訊號後輸出複數個頻率訊號;以及複數個頻率產生單元,耦接該處理單元,並產生具有該些頻率訊號的複數個振動波;其中,該些頻率產生單元產生的該些振動波係與沙塵的共振波互為破壞性干涉。 A sand and dust storm suppressor is used to suppress the resonance of sand and dust due to low-frequency vibration of the earth's crust. The sand and dust storm suppressor includes: a receiving unit for receiving a plurality of signals; a processing unit coupled to the receiving unit and calculating the signals Then output a plurality of frequency signals; and a plurality of frequency generation units, coupled to the processing unit, and generate a plurality of vibration waves with the frequency signals; wherein the vibration waves generated by the frequency generation units and the dust The resonance waves interfere with each other destructively. 如請求項1所述之沙塵暴抑制器,其中該接收單元接收的該些訊號係可由手動輸入、資料庫輸入、擷取雲端數據及/或接收衛星訊號。 The sandstorm suppressor according to claim 1, wherein the signals received by the receiving unit can be manually input, database input, cloud data retrieval, and/or satellite signal reception. 如請求項1所述之沙塵暴抑制器,其中該些訊號係包含時間資料、地圖資料、地形資料、地質資料、溫度資料、濕度資料、氣壓資料。 The sand and dust storm suppressor according to claim 1, wherein the signals include time data, map data, topographic data, geological data, temperature data, humidity data, and air pressure data. 如請求項1所述之沙塵暴抑制器,其中該處理單元輸出的該些頻率訊號的頻率係介於0.01~500Hz之間。 The sand storm suppressor according to claim 1, wherein the frequency of the frequency signals output by the processing unit is between 0.01 and 500 Hz. 如請求項1所述之沙塵暴抑制器,其中該些頻率產生單元的功率係介於1~200W。 The sand and dust storm suppressor of claim 1, wherein the power of the frequency generating units is between 1 and 200W. 如請求項1所述之沙塵暴抑制器,其中該些頻率產生單元係以陣列型態排列、線性型態排列、同心圓型態排列、不規則型態排列或上述型態之組合。 The sandstorm suppressor according to claim 1, wherein the frequency generating units are arranged in an array pattern, a linear pattern, a concentric circle pattern, an irregular pattern arrangement, or a combination of the above patterns. 如請求項1所述之沙塵暴抑制器,其中每一該頻率產生單元產生的該振動波係以一特定角度方向送出。 The sandstorm suppressor according to claim 1, wherein the vibration wave generated by each frequency generating unit is sent out in a specific angular direction. 如請求項7所述之沙塵暴抑制器,其中該特定角度係為不可變的或可調整的。 The sandstorm suppressor according to claim 7, wherein the specific angle is immutable or adjustable. 如請求項1所述之沙塵暴抑制器,其更包含:一電能供應單元,耦接於該接收單元、該處理單元及該些頻率產生單元。 The sandstorm suppressor according to claim 1, further comprising: an electric power supply unit coupled to the receiving unit, the processing unit and the frequency generating units.
TW108104847A 2019-02-13 2019-02-13 Sandstorm suppressor TW202030028A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
TW108104847A TW202030028A (en) 2019-02-13 2019-02-13 Sandstorm suppressor
CN201910242552.6A CN109946764A (en) 2019-02-13 2019-03-28 Sandstorm suppressor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW108104847A TW202030028A (en) 2019-02-13 2019-02-13 Sandstorm suppressor

Publications (1)

Publication Number Publication Date
TW202030028A true TW202030028A (en) 2020-08-16

Family

ID=67012102

Family Applications (1)

Application Number Title Priority Date Filing Date
TW108104847A TW202030028A (en) 2019-02-13 2019-02-13 Sandstorm suppressor

Country Status (2)

Country Link
CN (1) CN109946764A (en)
TW (1) TW202030028A (en)

Also Published As

Publication number Publication date
CN109946764A (en) 2019-06-28

Similar Documents

Publication Publication Date Title
Sakurai et al. Diurnal cycle of cloud system migration over Sumatera Island
Fan et al. Global ocean surface wave simulation using a coupled atmosphere–wave model
CA3156595C (en) Disdrometer having acoustic transducer and methods thereof
Tonin SOURCES OF WIND TURBINE NOISE AND SOUND PROPAGATION.
US20140260634A1 (en) Method and apparatus for monitoring wind turbine blades during operation
Cotté Extended source models for wind turbine noise propagation
CN111796244B (en) Evaluation method for influence of offshore wind farm on ground wave beyond-view-range radar detection efficiency
CA2743855A1 (en) Wind turbine providing reduced radio frequency interaction and related methods
Marcillo et al. On infrasound generated by wind farms and its propagation in low‐altitude tropospheric waveguides
Hansen et al. Identification of low frequency wind turbine noise using secondary windscreens of various geometries
US20230161070A1 (en) Situ measurement station for monitoring wind and water properties in extreme hydrodynamic conditions
Lee et al. Prediction of far-field wind turbine noise propagation with parabolic equation
CN208934166U (en) A kind of novel sound barrier of substation's noise control based on bionics coupling sound absorption
Maloney et al. Subseasonal SST variability in the tropical eastern North Pacific during boreal summer
CN107422313A (en) A kind of High Precision Automatic corner reflector system of normalization operation
TW202030028A (en) Sandstorm suppressor
Bolin et al. Long range sound propagation over a sea surface
Lee et al. Development of the Global-Korean aviation turbulence guidance (Global-KTG) system using the global data assimilation and prediction system (GDAPS) of the Korea meteorological administration (KMA)
Iqbal et al. Feasibility study of radio links using evaporation duct over sea off Malaysian shores
Huo et al. Observed particle sizes and fluxes of Aeolian sediment in the near surface layer during sand-dust storms in the Taklamakan Desert
Liu et al. Atmospheric frontal gravity waves observed in satellite SAR images of the Bohai Sea and Huanghai Sea
Whitaker HIWPP non-hydrostatic dynamical core tests: Results from idealized test cases
Yang et al. Uncertainty and feasibility of dynamical downscaling for modeling tropical cyclones for storm surge simulation
Ying et al. Effects of intraseasonal oscillation on the anomalous East Asian summer monsoon during 1999
Evans et al. Effects of different meteorological conditions on wind turbine noise