Force Distribution With Pose-Dependent Force Boundaries for Redundantly Actuated Cable-Driven Parallel Robots

This paper addresses the force distribution of redundantly actuated cable-driven parallel robots (CDPRs). A new and efficient method is proposed for the determination of the lower-boundary of cable forces, including the pose-dependent lower-boundaries. In addition, the effect of cable sag is considered in the calculation of the force distribution to improve the computational accuracy. Simulations are made on a 6DOF CDPR driven by eight cables to demonstrate the validity of the proposed method. Results indicate that the pose-dependent lower-boundary method is more efficient than the fixed lower-boundary method in terms of minimizing the motor size and reducing energy consumption.

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Temperature during the vibration-assisted compression of alfalfa

BioResources ◽

10.15376/biores.16.1.141-150 ◽

2020 ◽

Vol 16 (1) ◽

pp. 141-150

Author(s):

Xiaoyu Wu ◽

Shuai Yang ◽

Chundong Song ◽

Kun Ding ◽

Chuanzhong Xuan ◽

...

Keyword(s):

Energy Consumption ◽

Vibration Frequency ◽

Experimental Results ◽

Maximum Temperature ◽

Compression Time ◽

Vibration Parameters ◽

Reducing Energy ◽

Compression Temperature

Compression of alfalfa into briquettes is an effective way to solve the problem of storage and transportation. In the process of compression, heat is generated and the temperature is raised in the material. In fact, the appropriate temperature can improve the quality of alfalfa briquettes and reduce the energy consumption of densification. In this study, the effect of assisted vibration on the compression temperature was tested. The results showed that when the vibration frequency was below 15 Hz, the temperature at the center and side in compressed alfalfa increased slowly with compression time. When the vibration frequency was above 20 Hz, it increased first and then decreased with the increase of time. Moreover, the maximum temperature value increased remarkably when the frequency was above 20 Hz. In the same vibration frequency and compression time, the center temperature in the compressed alfalfa was higher than the side temperature. The experimental results provide a reference for the determination of reasonable vibration parameters, and explanation of the effect of vibration on reducing energy consumption.

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Study by the numerical method of increasing the efficiency of falling ventilation jets for a channel compact air conditioning system

Вестник гражданских инженеров ◽

10.23968/1999-5571-2020-17-6-164-170 ◽

2020 ◽

Vol 17 (6) ◽

pp. 164-170

Author(s):

V. R. Taurit ◽

◽

I. I. Sukhanova ◽

A. N. Kolosnitsyn ◽

◽

...

Keyword(s):

Energy Consumption ◽

Numerical Method ◽

Temperature Difference ◽

Air Conditioning ◽

Initial Temperature ◽

Air Conditioning System ◽

Air Conditioning Systems ◽

Reducing Energy

The problem of significantly reducing the consumption of ventilation air in ducted air conditioning systems by optimizing the efficiency of the air distributor is solved. Unconventional falling non-isothermal jets are experimentally investigated by numerical method with the identification of the structure features and determination of the calculated coefficients m and n according to the proposed methodology. The possibilities of reducing energy consumption by increasing the initial temperature difference of the supply duct air are shown.

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