Unbalanced Vibration Identification of Tangential Threshing Cylinder Induced by Rice Threshing Process

Tang, Zhong; Zhang, Haotian; Zhou, Yuepeng

doi:10.1155/2018/4708730

Cited by 18 publications

(14 citation statements)

References 21 publications

(20 reference statements)

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“…To facilitate specialized production and spare parts supply, the industry standard specifies a spacing of 76.2 mm between adjacent cutters and a horizontal inclination of 6°30′. e length of pendulum bar was 95 mm, the pendulum ring angle was 22°, the average speed of the cutter generally was 0-1.2 m/s, and the cutter driving wheel speed was 411 r/min [25]. e cutter knife was perpendicular to the heading direction of the harvester (reciprocating motion in horizontal direction).…”

Section: Cutting Barmentioning

confidence: 99%

Effects of Stem Cutting in Rice Harvesting by Combine Harvester Front Header Vibration

Tang

Zhang

Zhou

et al. 2019

Advances in Materials Science and Engineering

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In order to reveal the reason of stem cutting in rice harvesting by combine harvester front header, stem cutting principle of the front header was developed. Based on the structural models and the parameters of each part of header, the first eight-order constrained modal simulation analysis was carried out to obtain the vibration response frequency. The front header was produced and used to be tested for restraint experimental modal in the rice field. The rice stem cutting state of the header cutter was analyzed by carrying out the vibration test of the no-load rotation state and rice harvesting state in the field. According to the cutting diagram of the stalk in the header, the angle of the cutting surface and length distribution of the short stalk were analyzed with compound state of forward and vertical vibration. The results showed the mean and variance amplitude of front header were similar to length distribution of the short stalk. The mean length 23.60 mm of the repeatedly cut stems was inextricably linked to the up and down vibration amplitude 25.36 mm of the header. The stem cutting surface angles 38°, 44°, and 62° were for different forward speed and cutting areas on the cutting diagram. The above studies reveal the intrinsic nature between header vibration and length distribution of the cutting stem.

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Section: Cutting Barmentioning

confidence: 99%

Effects of Stem Cutting in Rice Harvesting by Combine Harvester Front Header Vibration

Tang

Zhang

Zhou

et al. 2019

Advances in Materials Science and Engineering

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“…e signal acquisition system and dynamic signal acquisition instrument were produced by the Chinese Donghua testing company. e test system consisted of the vibration signal acquisition system and signal analysis processing system, as is shown in Figure 7 e methods for testing and analyzing experimental modalities are available in reference [25]. e test used a single-point excitation multipoint to measure the response data.…”

Section: Experiments Mode Of Assembly Pistonmentioning

confidence: 99%

Inertial Vibration Characteristics of Track Chassis Caused by Reciprocating Motion of Crank Slider

Tang

Liu

Zhou

et al. 2019

Shock and Vibration

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The crank slider of self-propelled baling machinery is used for straw compression on the crawler chassis structure. During the reciprocating motion of the crank slider, the inertia of the piston will cause a greater shock to baling machinery. In this paper, the inertia of the crank slider piston was analyzed on crawler chassis. The model and parameter values of the inertia force balance of the crank slider were established by the complete balance method. The test mode was used to analyze the natural mode and mode shape of the piston. The vertical vibration amplitudes of the crawler chassis beam were tested and used to reflect the specific inertial vibration characteristics of the self-propelled baling machinery caused by the reciprocating motion of the piston. The inertial vibration caused by the reciprocating motion of the crank slider was eliminated by the method of weighting the tail of the track beam. Results indicated that the self-balancing counterweight of the crank slider was 261.82 kg. The six natural modal frequencies of the piston were 4.62, 17.26, 29.82, 63.85, 83.73, and 141.58 Hz, respectively. During the reciprocating motion of the piston, the first-order frequency of the piston would be excited by feeding auger excitation frequency of 3.77 Hz and may cause resonance. And, the vertical vibrates of track beam was based on the measuring point 6 as a fulcrum. Adding a counterweight of 265 kg at the end of the track chassis would completely eliminate the self-propelled baling machinery inertial vibration caused by the reciprocating motion of the crank slider.

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“…Some threshed outputs that do not pass through the sieve openings fall into the tailing auger which are conveyed to the sieve from the tailing window for the second cleaning. The acceleration test system includes acceleration sensors, signal collectors, signal processing software, and a PC [12]. The type of the 3-directional acceleration sensor is PCB-356A16 with a range of 0-50 g and frequency response of 0.3-6000 Hz.…”

Section: Vibration Signal Sampling and Analysismentioning

confidence: 99%

Vibration Suppression and Isolation for Rapeseed Grain Cleaning Loss Sensor

Liang

Wei

et al. 2019

Journal of Sensors

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Rapeseed cleaning loss is an important factor to weigh rapeseed combine harvester performance. With the development of sensor technology, establishing a rapeseed cleaning loss monitoring system can be interesting and necessary. However, the rapeseed combine harvester made in China is always with larger vibration, which is not beneficial for sensor monitoring accuracy. Experiment results indicate that inertia force from vibrating sieve unbalanced motion has the greatest influence on the monitoring accuracy of the sensor in its installation position. To reduce the effect of vibration on monitoring accuracy of the sensor, the vibration absorption and isolation structure for cleaning loss sensor has been designed. Moreover, the vibration isolation design was performed on the basis of vibration suppression. The vibration isolation rubber was designed to isolate the vibration at the joint of the sensor with the frame. The experimental results shown that the above design can reduce the vibration disturbance and highlight the grain collision signal greatly, which is beneficial for improving the sensor discrimination ability.

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Unbalanced Vibration Identification of Tangential Threshing Cylinder Induced by Rice Threshing Process

Cited by 18 publications

References 21 publications

Effects of Stem Cutting in Rice Harvesting by Combine Harvester Front Header Vibration

Effects of Stem Cutting in Rice Harvesting by Combine Harvester Front Header Vibration

Inertial Vibration Characteristics of Track Chassis Caused by Reciprocating Motion of Crank Slider

Vibration Suppression and Isolation for Rapeseed Grain Cleaning Loss Sensor

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