1、a 英文原文Harmonic Response Analysis On Cutting Part of Shearer Physical Simulation System Paper TitleAbstractCoal-rock interface recognition system mainly meanscollecting various response signals available from multi-sensorsequipped in shearer and further analyzing and those response signals to see if
2、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 collect
3、ing 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 frequencyresponse is analyzed. The study not onl
4、y optimizes the dispositionof 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.Key
5、words cutting part finite element dynamicsharmonic response coal-rock interface recognitionI. INTRODUCTIONCoal-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.
6、 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
7、 similarity condition, to establish physical simulation system in thelaboratory, 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
8、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 vibrationstate, pressure in the raising cyl
9、inder, torque signal of inputshaft, 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
10、are mostly focused on fusion research1-3, 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 wil
11、l 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 theperspective of frequency response is analyzed to obtain the best point of picking-up v
12、ibration 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 SHEARERThe testing model of shearer is based on the prototype of electric traction shearer (model: MGTY400/900-3.3D) according t
13、o 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 shearer4 is shown as figure1.Shear
14、er 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 thetop position(ang
15、le is =48.96) to the bottom position (angle is=26.69) . The position is shown as figure 2.III. HARMONIC RESPONSE AT LEVEL POSITIONHarmonic response analysis is a method used to determine the steady-state response of a linear structure to loads that varysinusoidally (harmonically) with time. The inpu
16、t is the harmonic load for the known size and frequency. The idea is to calculate the structures response at several frequencies and obtain a curve graph of some response quantity versus frequency5.A. Establishment of three-dimensional modelWhen 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 threedimen
