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任務(wù)書(shū)
任務(wù)下達(dá)日期：2011年2月28日
畢業(yè)論文日期：2011年3月7日至2011年6月10日
畢業(yè)論文題目：MG400/930-AWD型交流電牽引采煤機(jī)牽引部設(shè)計(jì)
畢業(yè)論文專題題目：
畢業(yè)論文主要內(nèi)容和要求：
主要技術(shù)參數(shù)及配套設(shè)備：
采高（m）：1.6～3.5；
適應(yīng)傾角（°）：≤25；
煤質(zhì)硬度 : 硬或中硬；
機(jī)面高度（mm）：1250；
機(jī)重（T）：～60；
滾筒截深（mm）：800；
滾筒直徑 （mm）： 1600、1800、2000；
滾筒轉(zhuǎn)速 （mm）：25.83、29.29；
滾筒水平中心距（mm）：13719；
搖臂回轉(zhuǎn)中心距（mm）：8250；
牽引形式 ：強(qiáng)力輪齒—齒軌電牽引；
牽引速度(m/min)： 0～8.5～14.2；
牽引力（KN）：670～400；
搖臂回轉(zhuǎn)中心距（mm）：8250；
搖臂擺角：下擺 上擺；
牽引電機(jī)型號(hào)：YB2-250M-4-55；
裝機(jī)功率（KW）：930
（其中兩個(gè)截割電機(jī)2×200KW 兩個(gè)牽引電機(jī)2×55KW，破碎電動(dòng)機(jī)20KW，共計(jì)2×200＋2×55＋20=930）
技術(shù)要求：
1. 查閱有關(guān)資料、完成該機(jī)總體方案的設(shè)計(jì)，三機(jī)配套布置；
2. 根據(jù)有關(guān)技術(shù)參數(shù)對(duì)該采煤機(jī)牽引部進(jìn)行設(shè)計(jì)；
3. 對(duì)該牽引部主要傳動(dòng)組件、零件進(jìn)行加工圖設(shè)計(jì)；
4. 編寫完成整機(jī)設(shè)計(jì)計(jì)算說(shuō)明書(shū)。
5.
院長(zhǎng)簽字： 指導(dǎo)教師簽字：
a． 英文原文
Harmonic Response Analysis On Cutting Part of Shearer Physical Simulation System Paper Title
Abstract—Coal-rock interface recognition system mainly means
collecting various response signals available from multi-sensors
equipped in shearer and further analyzing and those response signals to see if it is cutting coal or rock. For this purpose, the shearer equips total five types of various distinguishing sensors to pick up these signals. Both the optimized configuration of sensors measuring points and the choices of the sensors properties are the key factors to correctly and completely collecting the manifold dynamic characteristic signals of cutting part of physicalsimulation system. Therefore, it is important and necessary to carry out the harmonic response dynamics analysis of shearer cutting part. The vibration characteristics based on frequency
response is analyzed. The study not only optimizes the disposition
of the vibration sensor for the maximum output amplitude signals, but also identifies the frequency range of the vibration sensor, so that it not only satisfies the condition for undistorted measurements, but also avoids that the sensors are interfered due to resonance.
Keywords— cutting part finite element dynamics
harmonic response coal-rock interface recognition
I. INTRODUCTION
Coal-rock interface recognition system mainly collects response signals of cutting force of shearer by multi-sensor and analyses this response signal for the recognition of cutting coal or rock. Therefore, it is basic premise to pick up signals. Generally there are two methods to pick up these signals: one is to collect data at the coal interface, which, however, brings a lot of difficulties as a result, and is limited to certain extent by many factors. Another method is, under meeting the similarity condition, to establish physical simulation system in the
laboratory, including media and the simulation ofshearer traction-cutting mechanism. This way can adjust structural parameters, mechanical and physical performance parameters of coal or rock in large range; meanwhile, this way can strictly control the test parameters, optimize test methods to obtain the accurate and reliable results. So the physical simulation system of shearer is developed on the foundation of similarity principle.
With the states of cutting different materials, arm vibration
state, pressure in the raising cylinder, torque signal of input
shaft, torsional vibration signal of drum shaft and cutting electrical current accordingly reflect changes in the state of cutting. So the five types of sensors to pick up these signals are equipped with. In recent years ,the researches of coalrock interface recognition are mostly focused on fusion research[1]-[3], unfortunately, little concerns about the validity and correctness of the data itself is given, which involves the disposition optimization of sensors measuring points and the choice of the sensor performances. In view of this, the vibration states of arm will be analyzed and summarized up in this paper. So the cutting part of shearer physical simulation system for finite element harmonic analysis is made, the vibration response characteristics of cutting part from the
perspective of frequency response is analyzed to obtain the best point of picking-up vibration of arm, optimize the disposition of the vibration sensor measuring point and determine the due working frequency range of sensor.
II. PHYSICAL SIMULATION SYSTEM OF SHEARER
The testing model of shearer is based on the prototype of electric traction shearer (model: MGTY400/900-3.3D) according to the similarity theory, and is designed by the geometric ratio of one to eight. Based on the foundation of this, it is optimized and remodeled to highlight the simples of model and meet the performance, low cost, simple structure. The physical simulation system of shearer[4] is shown as figure1.
Shearer model is composed of drum, arm, torsional moment sensor, motor, cylinder and body. The cutting part of model needs to complete two actions: the motor as power input mechanism drives the drum to finish cutting; and the height of arm is adjusted successively by the cylinder from the
top position(angle is α=48.96°) to the bottom position (angle is
β=26.69°) . The position is shown as figure 2.
III. HARMONIC RESPONSE AT LEVEL POSITION
Harmonic response analysis is a method used to determine the steady-state response of a linear structure to loads that vary
sinusoidally (harmonically) with time. The input is the harmonic load for the known size and frequency. The idea is to calculate the structure's response at several frequencies and obtain a curve graph of some response quantity versus frequency[5].
A. Establishment of three-dimensional model
When we ensure the original structure size, the quality of structure, simplify these parts what are not the focus of the study, A model of cutting part is established by threedimensional modeling software Pro/E. The main parts' sizes are drum diameter 225 mm, arm length 490 mm, height 150
mm, width 154 mm, width 735 mm and so on.
B. Definition of element type and material properties
After completion in three-dimensional modeling, model is imported ANSYS11.0 finite element analysis software. Based on the structure of shearer, the type of solid element solid92 is selected. This element type is suitable for meshing of the irregular grid of model established by a variety of CAD / CAM. Element is defined by 10 nodes, and is the quadratic
tetrahedron element of pure displacement shape function. Second , the laboratory model of shearer is steel material, so material property is defined isotropic materials, elastic modulus is 206 Gpa, Poisson's ratio is 0.3,density is 7800 kg / m 3 .As tetrahedron element types is selected, mesh is a free meshing. Meshes density meet the requirements of optimization of sensor location. the meshed model as shown in Figure 3 ,from top to bottom for the Y direction ,and up is positive; The horizontal direction for the X direction , the right is positive; forward and afterward for the Z direction ,forward is positive .the local distribution of nodes shown in Figure 4.
C. Boundary conditions and Apply loads
Because the stand plate of laboratory shearer hinges onthe fuselage, while the model is built to remove the fuselage the displacement constraints of all degrees of freedom are imposed on the hinged earrings. In working process of shearer cutting one coal level, the rocker arm position is fixed by the cylinder, it is equivalent to the all degrees of freedom constraints imposed hinged earrings for a cutting height of
shearer.
In the harmonic response analysis, loads applied is harmonic load as F= Focoswt. There are two ways to apply load: one is real-imaginary part, the other is amplitude-phase[6], in this paper, real-imaginary part is selected. The peak of load excitation force is Fo=300N, and it’s frequency range is generally 0 to 500 Hz, this is selected based on the testing data
from the laboratory. The points of applying load are selected in the front face parallel to drum axis, five points are applied load in downward direction, as shown in figure 3.
D. Results of harmonic analysis
The purpose which the cutting part for harmonic analysis is made is to obtain its frequency response state, to test the transmission characteristic of mechanism for excitation force, to study vibration displacement in each frequency, and to acquire natural frequency and band in distortion measuring condition.
Nodes 1157，20060，20044，3388，583 are selected to be investigated. The frequency-displacement curve of vibration in Y direction is shown in figure 5, it is drawn from the figure that the largest vibration displacement is of node 1157, the vibration form of the other nodes is similar to the node 1157. The resonant frequency of node 1157 appears in
the 38Hz, 278Hz, and 324Hz. The distorted frequency range is nearly 38Hz to 278Hz. By analyzing the displacement of each frequency corresponding to the three nodes, the displacement of node 1157 is generally larger than other two nodes. It shows that the region of nodes 1157 possesses excellent
amplification for the excitation signal, and maintains good transmission characteristics of the excitation force.
It is drawn from the figure 6 that the largest vibration
displacement is of node 1157 when it vibrates in Z direction. The resonant frequency of node 1157 appears in the 38Hz, 98Hz, 202Hz, 250Hz, 276Hz, and 324Hz. By the analysis above, the distorted frequency range is nearly 96Hz to 202Hz. In these three nodes, by analyzing the displacement of each
frequency, node 1157 also possesses larger displacement than other two nodes, excellent amplification for the excitation signal, and maintains good transmission characteristics of the excitation force.
IV. HARMONIC RESPONSE ANALYSIS AT TOP POSITION
A. Preprocess model and solution
The cutting part at top position for harmonic analysis is done when load is changed but other conditions. Loads are decomposed into X and Y axis respectively, it is equivalent to vertical downward load imposed on drum at top position. The equivalent load force is 300N, and is decomposed into Y axis as 196.96N, the downward of Y direction is negative based on model coordinate system, into X axis as 226.29N, the right of X direction is positive based on model coordinate system. Load is applied on model shown in figure 7.
B. Results of harmonic response and analysis
Nodes 1157 ， 20060 ，20044 are still selected to be investigated, the frequency-displacement curve of vibration in Y direction as shown in figure 8, it is drawn from the figure that the largest vibration displacement is of node 1157, the vibration form of the other nodes is similar to the node 1157. The resonant frequency of nodes 1157 ，20060 ， 20044 appears in the 38Hz, 278Hz, and 324Hz. The distorted frequency range is nearly 38Hz to 278Hz. It is shown in figure 8 that the cutting part of shearer at top position only appears third-order resonance, and the displacement of low-frequency resonance is the largest. So the cutting part of shearer mainly avoids noises signals of low-frequency, particularly in the three resonant frequencies. By analyzing the displacement of each frequency corresponding to the three nodes, it is shown that the region of nodes 1157 possesses excellent amplification for the excitation signal, and maintains good transmission characteristics of the excitation force as the level position.
It is drawn from the figure 9 that the largest vibration displacement is of node 583 when it vibrates in Z direction at top position. The resonant frequency of node 1157 appears in the 38Hz, 98Hz, 202Hz, 250Hz, 278Hz, 324Hz and 424Hz. By the analysis above, the distorted frequency range is nearly 98Hz to 202Hz. For vibration in Z direction at top position,node 1157 possesses larger displacement than other two nodes except individual frequency. So with regard to vibration in Z direction at top position, node 1157 can still be selected to be the picking-up point for good transmission characteristics.
V. HARMONIC RESPONSE ANALYSIS AT BOTTOM POSITION
A .Preprocess model and solution
The cutting part at bottom position for harmonic analysis is still done when load is changed but other conditions. Loads are also decomposed into X and Y axis respectively, it is equivalent to vertical downward load imposed on drum at top position. The equivalent load force is 300N, and is decomposed into Y axis as -148.59N, the downward of Y direction is negative based on model coordinate system, into X axis as -260.62N, the left of X direction is negative based on model coordinate system. Load is applied on model shown in figure 10.
B. Results of harmonic response and analysis
Nodes 1157 , 20060 ,20044 are still selected to be investigated, the frequency-displacement curve of vibration in Y direction as shown in figure 11, it is drawn from the figure that the largest vibration displacement is of node 1157, the displacement value is 1.11cm, the vibration form of the other nodes is similar to the node 1157. The resonant frequency of nodes 1157,20060,20044 appears in the 38Hz, 278Hz, and
324Hz. The distorted frequency range is nearly 38Hz to 278Hz. It is shown in figure 11 that the cutting part of shearer imposed sinusoidal excitation force at bottom position only appears third-order resonance, and the displacement of lowfrequency resonance is the largest. So the cutting part of shearer mainly avoids noises signals of low-frequency,
particularly in the three resonant frequencies. It is drawn from the figure 12 that the largest vibration displacement is of node 583 when it vibrates in Z direction at bottom position. The resonant frequency of node 1157 appears in the 40Hz, 98Hz, 202Hz, 250Hz, 276Hz, 324Hz and 424Hz.
By the analysis above, the distorted frequency range is nearly
98Hz to 202Hz, the displacement unit is meter.
VI. CONCLUSION
The cutting part of shearer for harmonic response analysis at level, top, and bottom position is done to acquire the vibration displacement law corresponding to frequency. It concluded:
(1) With the vibration in Y direction, node 1157 retains excellent amplification for the excitation signal, and maintains good transmission characteristics of the excitation force. So the region of node 1157 is suitable picking-up point monitoring the vibration in Y direction.
(2) The sensors installed for vibration in Y direction should possess good transmission characteristics of the excitation force in the frequency range of 0 to 265Hz, for vibration in Z direction, the frequency range should be 0 to 200Hz.
(3) It is shown that output signals for harmonic response analysis zoom out unlimitedly in the resonant frequencies, yet the signals of other frequencies retain good amplification; meanwhile, the signals of resonant frequencies should be filtered to avoid zooming out unlimitedly and interfering the normal output signals of coal-rock state.
It is drawn that the picking-up point of the largest amplitude is obtained, and the placement point of accelerometer sensor is optimized; meanwhile. Frequency band of sensors is studied, the sensor also possesses the filtering effect. The reliability of physical experiment is well
verified in the simulation testing.
b.中文翻譯
截割部諧波響應(yīng)分析的物理仿真系統(tǒng)
文摘-煤-主要是巖石界面識(shí)別系統(tǒng)收集各種響應(yīng)信號(hào)可以從多傳感器并進(jìn)一步分析的裝備和反應(yīng)信號(hào),來(lái)看看它是否在切割煤巖體。為了達(dá)到這個(gè)目的,這些裝備總共五種類型的各種識(shí)別傳感器獲取這些信號(hào)。兩個(gè)傳感器的優(yōu)化配置問(wèn)題測(cè)量分和選擇的傳感器性能的關(guān)鍵因素能正確、全面收集在靜聽(tīng)著的松林之間動(dòng)態(tài)信號(hào)特征的截割部的物理仿真系統(tǒng)。因此,這是重要而且必不可少的進(jìn)行諧響應(yīng)動(dòng)力學(xué)分析的剪切截割部?！』陬l率的振動(dòng)特性響應(yīng)進(jìn)行了分析。本研究不僅優(yōu)化配置振動(dòng)傳感器的最大的輸出振幅信號(hào),但也會(huì)辨識(shí)出語(yǔ)句的振動(dòng)的頻率范圍傳感器,因此它不僅滿足條件如實(shí)的測(cè)量的工具,而且也避免了,由于傳感器干擾對(duì)共振。
關(guān)鍵詞--截割部 有限元?jiǎng)恿W(xué) 諧響應(yīng) 煤和巖石的識(shí)別
1. 介紹
煤和巖石的識(shí)別系統(tǒng)主要是多傳感器收集的希勒切削力的響應(yīng)信號(hào)和對(duì)這些信號(hào)的分析。因此,它是獲取信號(hào)號(hào)的基本前提。通常有兩種方法：一種是在煤的界面收集數(shù)據(jù)，但卻帶來(lái)很多困難的結(jié)果，而且許多因素在某個(gè)程度上來(lái)說(shuō)是有限的。另一種方法是在相似條件下在實(shí)驗(yàn)室建立物理仿真系統(tǒng)， 包括媒體與模擬的工具牽引-切割機(jī)制,這種方式可以在很大的范圍內(nèi)調(diào)整煤巖體機(jī)械物理性能結(jié)構(gòu)參數(shù)。同時(shí)，這種方法能嚴(yán)格控制試驗(yàn)參數(shù)， 優(yōu)化試驗(yàn)方法獲得準(zhǔn)確、可靠的結(jié)果。所以物理模擬系統(tǒng)開(kāi)發(fā)的剪毛的的基礎(chǔ)上相似原則。在切割不同材料時(shí)，搖臂的狀態(tài)、升降氣缸的壓力、輸入軸的扭矩信號(hào)、 滾筒軸的扭轉(zhuǎn)振動(dòng)信號(hào)和切割電流的變化反應(yīng)出切割狀態(tài)的不同。所以要配備這五種類型的傳感器來(lái)獲取這些信號(hào)。最近幾年，大家都把對(duì)煤和巖石的識(shí)別的研究工作的注意力放在融合研究上。不幸的是，很少關(guān)注到有效性數(shù)據(jù)本身的正確性提供的參考依據(jù)?！∵@牽涉到傳感器測(cè)量分的配置優(yōu)化傳感器測(cè)量分傳感器性能的選擇。鑒于此,本文將是對(duì)搖臂振動(dòng)狀態(tài)的分析和總結(jié)。所以截割部機(jī)進(jìn)行物理模擬系統(tǒng)是由有限元諧波分析振動(dòng)響應(yīng)的特點(diǎn),從截割部頻率響應(yīng)分析的角度來(lái)取得手臂振動(dòng)的最佳契合點(diǎn)，優(yōu)化振動(dòng)傳感器測(cè)量點(diǎn)，決定傳感器的最終工作頻率范圍。
2. 物理仿真系統(tǒng)的工具
測(cè)試模型是根據(jù)相似理論基于原型電牽引采煤機(jī)(模型:MGTY400/900-3.3D)，并且是以1:8的比例設(shè)計(jì)的。在這基礎(chǔ)上,這是重新進(jìn)行了優(yōu)化,并突出的簡(jiǎn)便性模型和達(dá)到要求的性能、低成本、簡(jiǎn)單的結(jié)構(gòu)。
的物理仿真系統(tǒng)以數(shù)字[4]表示：
1.采煤機(jī)模型是由滾筒、搖臂、扭轉(zhuǎn)力矩傳感器、電機(jī)、液壓缸和機(jī)身組成。截割部需要完成兩種運(yùn)動(dòng)：以電機(jī)作為動(dòng)力驅(qū)動(dòng)滾筒完成切割;由液壓缸來(lái)調(diào)整搖臂從上頂板到下地板的高度。
3.水平位置上的諧波響應(yīng)
諧響應(yīng)分析是一種用來(lái)確定穩(wěn)態(tài)響應(yīng)線性結(jié)構(gòu)的負(fù)荷隨著時(shí)間不斷變化的方法。輸入是諧波負(fù)載為已知的大小和頻率?！∵@個(gè)想法是計(jì)算了結(jié)構(gòu)的反應(yīng)在幾個(gè)不同頻率和獲得一個(gè)曲線圖的數(shù)量與一些反應(yīng)頻率。
a. 建立三維模型
當(dāng)我們確保原結(jié)構(gòu)的尺寸時(shí)，結(jié)構(gòu)的質(zhì)量，簡(jiǎn)化了的非重點(diǎn)研究的部件，一個(gè)用三維切削部分建模軟件Pro / E建立的模型。他主要零件滾筒的直徑是 225毫米，長(zhǎng)490毫米,高150毫米，寬154毫米或者寬735毫米等等。 b. 元素類型和材料性能的定義
完成三維建模后，用ANSYS11.0軟件對(duì)模型進(jìn)行有限元分析?；跐L筒的結(jié)構(gòu)，solid92固體元素的類型是選定的?！∵@個(gè)元素類型適用于嚙合由多種CAD /CAM建立的不規(guī)則網(wǎng)格模型。元素節(jié)點(diǎn)所定義的是十二次四面體元素的純位移形函數(shù)。第二,采煤機(jī)的實(shí)驗(yàn)?zāi)Ｐ筒牧鲜卿?，所以材料的性能是由各向同性材料決定的，彈性模量是206 Gpa, 泊松比0.3,密度是7800 kg / m 3。作為四面體單元類型被選中，網(wǎng)格是一個(gè)自由的嚙合。網(wǎng)格密度能夠滿足傳感器位置的優(yōu)化的需求?！∪缱髨D所示的網(wǎng)狀模型圖3, 從上到下為Y方向,是正方向; 水平方向X軸方向,向右是正方向；前后的Z方向，向前是正方向。節(jié)點(diǎn)分布如圖4。
c. 邊界條件和適用的負(fù)載
因?yàn)椴擅簷C(jī)的滑靴取決于機(jī)身，而建立模型,可以有效的去除所有強(qiáng)加在鉸鏈上的位移約束的自由度。采煤機(jī)在工作過(guò)程中切割一煤水平, 搖臂桿位置是由氣缸固定的,它通過(guò)鉸接點(diǎn)限制所有自由度來(lái)使采煤機(jī)截割部達(dá)到一定高度?！ ≡谥C響應(yīng)分析,荷載應(yīng)用作為F= Focoswt諧波負(fù)載?！∮袃煞N方法可以適用負(fù)荷: 一種是虛構(gòu)部分，另一種是相。本文，選擇了虛構(gòu)部分。負(fù)荷的峰值是F= 300N激振力，它的頻率范圍一般0到500赫茲，這是從實(shí)驗(yàn)室基于實(shí)驗(yàn)數(shù)據(jù)的選擇?！?yīng)用載荷點(diǎn)的被選擇在滾筒前面的平行線上。應(yīng)用負(fù)荷在向下方向的五點(diǎn)如圖3所示。
D．諧波分析的結(jié)果
截割部分的諧波分析的目的獲得它的頻率響應(yīng)狀態(tài)，測(cè)試傳輸特性的機(jī)理，研究在每個(gè)頻率振動(dòng)位移,并獲得固有頻率和樂(lè)隊(duì)在變形的測(cè)量條件。選擇節(jié)點(diǎn)1157、20060、20044、3388、583用于調(diào)查。振動(dòng)的頻率位移曲線在Y軸方向是顯示在圖5中, 這是來(lái)自保持的最大的振動(dòng)位移的節(jié)點(diǎn)1157，它振動(dòng)形式的其他節(jié)點(diǎn)是相似的節(jié)點(diǎn)1157。諧振頻率的節(jié)點(diǎn)1157出現(xiàn)在38Hz,278Hz的,324Hz。扭曲的頻率范圍接近于278Hz到38Hz。通過(guò)分析相應(yīng)于這三節(jié)點(diǎn)的位移值的頻率, 位移節(jié)點(diǎn)的1157總體上大于其它兩個(gè)節(jié)點(diǎn)。它顯示的地區(qū)的節(jié)點(diǎn)1157具有良好的放大的激勵(lì)信號(hào),并且維持良好的激振力的傳遞特性。這是來(lái)自圖6, 當(dāng)它在Z方向移動(dòng)時(shí)，最大的振動(dòng)節(jié)點(diǎn)的位移是1157?！≈C振頻率的節(jié)點(diǎn),出現(xiàn)在38Hz、98Hz 、202Hz、 276Hz、250Hz、276 Hz和324Hz?！⊥ㄟ^(guò)以上分析，被扭曲的頻率范圍幾乎是202Hz到96Hz。在這三個(gè)節(jié)點(diǎn),通過(guò)分析位移值頻率, 也擁有更大、節(jié)點(diǎn)位移比1157其他兩個(gè)節(jié)點(diǎn),準(zhǔn)確的放大的激勵(lì)信號(hào),并且維持良好的傳播特性激振力。
Ⅳ.最高的點(diǎn)的諧波響應(yīng)分析
a. 預(yù)處理模型和解決方案
在切割部最高點(diǎn)的諧波分析是在其他條件不變，負(fù)載進(jìn)行更改時(shí)。荷載分解為X和Y軸分別就相當(dāng)于垂直向下的荷載施加在滾筒頂點(diǎn)位置。該等效負(fù)載力是300N，并分解到Y(jié)軸為196.96N，Y方向的基礎(chǔ)上下調(diào)為負(fù)模型坐標(biāo)系，將X軸為226.29N，右X方向?yàn)檎谀Ｐ妥鴺?biāo)系。負(fù)載時(shí)在圖7所示的模型。
b.諧波響應(yīng)和分析的結(jié)果 節(jié)點(diǎn)1157、20060、20044仍然被選擇來(lái)做研究，振動(dòng)頻率位移曲線Y方向，如圖8所示，從圖中繪制的最大振動(dòng)位移是節(jié)點(diǎn)1157，其他節(jié)點(diǎn)的振動(dòng)的形式是類似于節(jié)點(diǎn)1157。節(jié)點(diǎn)1157 、20060、20044的諧波共振頻率出現(xiàn)在38Hz，278Hz，324Hz。扭曲頻率范圍是接近于38Hz到278Hz。這顯示在圖8，該采煤機(jī)在截割部頂點(diǎn)的位置只出現(xiàn)第三階共振，以及低頻位移共振是最大的。因此，采煤機(jī)截割部大部分避免了低頻噪聲信號(hào)，尤其是在第三共振頻率。通過(guò)分析位移每個(gè)頻率所對(duì)應(yīng)的三個(gè)節(jié)點(diǎn)，它表明在節(jié)點(diǎn)1157，該區(qū)域的節(jié)點(diǎn)具有優(yōu)良為激勵(lì)信號(hào)放大，并保持著良好作為激振力的水平傳輸特性位置。
這是圖9，最大振動(dòng)位移是節(jié)點(diǎn)583在最頂點(diǎn)的位置在Z方向振動(dòng)的位移。節(jié)點(diǎn)1157的共振頻率出現(xiàn)在38Hz，98Hz，202Hz，250Hz，278Hz，324Hz和424Hz。通過(guò)上述分析，扭曲的頻率范圍是接近98Hz至202Hz。對(duì)于最高點(diǎn)在Z方向振動(dòng)時(shí)，1157節(jié)點(diǎn)擁有大于其他兩個(gè)節(jié)點(diǎn)位移除個(gè)別頻率。因此，對(duì)于在最高點(diǎn)位置沿Z方向的振動(dòng)，節(jié)點(diǎn)1157仍然可以被選擇為良好的傳輸特性的采摘行動(dòng)點(diǎn)。
Ⅵ．在最低點(diǎn)位置的諧響應(yīng)分析
a.一個(gè)預(yù)處理模型和解決方案
截割部底部位置的諧波分析是當(dāng)負(fù)載改變，但其他條件不變時(shí)。荷載也分別分解為X和Y軸上，相當(dāng)于垂直向下的荷載施加于滾筒頂部位置。等效負(fù)載力是300N，是到Y(jié)軸分解為- 148.59N，對(duì)Y向下方向?yàn)樨?fù)基于模型坐標(biāo)系，到X軸為- 260.62N，X的方向向左為負(fù)的基礎(chǔ)上模型坐標(biāo)系。負(fù)載時(shí)所顯示的模型圖10。
b.諧波響應(yīng)和分析結(jié)果
節(jié)點(diǎn)1157、20060、20044仍然被選擇來(lái)做研究，振動(dòng)頻率位移曲線Y方向，如圖11所示，從圖中繪制，最大振動(dòng)位移，節(jié)點(diǎn)1157的位移值1.11厘米，對(duì)其他振動(dòng)形式類似于節(jié)點(diǎn)1157。諧振頻率節(jié)點(diǎn)1157、20060、20044出現(xiàn)在38Hz，278Hz，324Hz。扭曲的頻率范圍接近于38Hz到278Hz。它是在圖11所示的采煤機(jī)割的一部分在底部位置施加正弦激振力只出現(xiàn)三階共振，以及低頻位移共振是最大的。因此，削減部分采煤機(jī)主要是避免了低頻噪聲信號(hào)，特別是在三個(gè)共振頻率。
這是圖12，最大的振動(dòng)位移是當(dāng)它在底部位置沿Z方向振動(dòng)的節(jié)點(diǎn)583。節(jié)點(diǎn)1157的共振頻率出現(xiàn)在40Hz，98Hz，202Hz，250Hz，276Hz，324Hz和424Hz。通過(guò)上述分析，扭曲的頻率范圍是接近98Hz到202Hz，位移單位是米。
Ⅵ.結(jié)束語(yǔ)
用于在采煤機(jī)截割部頂部、底部和水平位置的諧波響應(yīng)分析，是為了獲得
振動(dòng)頻率對(duì)應(yīng)的位移定律。這結(jié)論是：
（1）隨著Y方向振動(dòng)，節(jié)點(diǎn)保留1157準(zhǔn)確的激勵(lì)信號(hào)放大，并保持
良好的傳輸特性激振力。因此，1157區(qū)域的節(jié)點(diǎn)適合采摘，注冊(cè)點(diǎn)監(jiān)察在Y方向的振動(dòng)。
（2）安裝在Y方向的振動(dòng)傳感器須具備良好的傳輸特性激振力在0至265Hz頻率范圍內(nèi)，為在Z方向的振動(dòng)，其頻率范圍應(yīng)為0至200Hz時(shí)。
（3）研究表明，輸出信號(hào)的諧波響應(yīng)分析無(wú)限放大，在共振頻率，但對(duì)其它頻率的信號(hào)保持良好擴(kuò)增;同時(shí)，共振頻率的信號(hào)應(yīng)篩選，以避免無(wú)限縮小和干擾煤巖國(guó)家正常的輸出信號(hào)。這是獲得的最大的振幅的采摘行動(dòng)點(diǎn)，并且對(duì)安置點(diǎn)加速度傳感器進(jìn)行了優(yōu)化。傳感器的頻率波段進(jìn)行了研究，該傳感器還具有過(guò)濾效果。在物理實(shí)驗(yàn)的可靠性將在模擬試驗(yàn)中驗(yàn)證。