It is known that two primary disadvantages of parallel manipulators are the complicated forward kinematics and limited workspace. This paper mainly addressed the kinematics and workspace analyses of a 3/3-RRRS 6-DOF parallel manipulator. After a brief introduction of the 3/3 -RRRS 6-DOF parallel manipulator, a three-dimensional model and its relevant structure diagram are constituted, the forward and inverse displacement analyses of the 3/3-RRRS parallel manipulator are discussed in detail, especially, a novel geometrical method referred as equivalent mechanism is proposed for the forward displacement analysis of the manipulator under consideration. Based on the displacement analyses of the manipulator, a discretization method is proposed for the computation of the reachable position/orientation workspace of the 3/3-RRRS parallel manipulator, respectively. Examples of a 3/3-RRRS parallel manipulator are given to demonstrate these theoretical results.

Based on the theoretical analysis of forming shoulder used in fill-and-seal packaging machine, this paper presented the 2-D and 3-D mathematical models of offset bending curve jointing the vertical tube and shoulder parts. According to the technology widely used in the manufacturers, the theoretical basis was provided for preparing the rough parts to make the shoulders. Furthermore, a new method using test tube was proposed to check the shape curve and locate the shoulder parts before welding. Transformed from 3-D offset bending curve, the 2-D cutting data of test tube was also provided for practical use.

Remote monitoring is an important technical way to assure the key equipment to run properly and safely. In the paper, a remote monitoring system based on GPRS wireless communication was developed for large-scale equipments. The architecture of the system was given. The key techniques of the system design, including the remote data transmission, remote monitoring and fault diagnosis techniques were analyzed. Furthermore, the hardware and software design of Data Transmission Unit (DTU) was introduced in detail. And the functional modules of the remote monitoring service system were presented. The system provides an effective way to realize remote monitoring and fault diagnosis for large-scale equipments.

In this study, we analyzed the relationship between social support cognition types and family resource management. Participants were 501 migrant workers in Suzhou, China. The results indicated that: (a) migrant workers with different social support cognition types reported significant differences in their family resource management, (b) migrant workers with different demographic variables reported significant differences in their social support cognition types, and (c) certain demographic variables and social support cognition Type II significantly predicted family resource management.

Many factors influence WEDM (Wire-cut Electrical Discharge Machining) processing precision, and the influence of various factors on the processing precision are expressed by wire electrode dynamic form ultimately. In this paper, the transverse vibration theoretical model of the axially moving electrode wire coupled with thermal stresses is established by the principle of Hamilton. The influence of various processing parameters on wire vibration are analyzed and simulated. This study provides a relevant theoretical basis for optimizing processing parameters, reducing the wire vibration and improving machining precision.