Research on the rotational inertia of radial piston pump and the optimization method of the pump parameters
This paper aims to propose a method of optimizing the structure of radial piston pump from the aspect of reducing the rotational inertia. A modeling method based on basic dimensions and scale factors is developed. By using this method, three different types of radial piston pumps are studied. And the relative rotational inertia coefficient is adopted to evaluate the difference among them. Further study states that the relative rotational inertia coefficient changes along with the eccentricity ratio and the thickening factor. Finally a criterion is obtained, which could be used to optimize the structure and the dimensions of radial piston pumps.
High-torque axial-plunger hydraulic motor with phase control of the shaft rotation speed
The article reviews the design and parameters of high-torque axial-plunger hydraulic motor with phase control of the shaft rotation speed. This hydraulic motor is distinguished by a two-row eighteen-cylinder block and a rotary distribution disk with two rows of sickle-shaped distribution windows for supplying and discharging the working fluid. The hydraulic motor differs by a tripled displacement and torque from a similar hydraulic machine, which classifies it a high-torque hydraulic engines. Its power volume increases 1.6 times, and power response more than four times. At the same time, the fluctuation of the shaft rotation speed is measured by the corresponding value of the fluctuation coefficient equal to 0.0154. The phase control provides the hydromotor with a control range of 150…200 and more, while hydraulic motors with variable working volume range maximum 5. Therefore, the new hydraulic machine has a high potential for operating in hydraulic drives of machines.
Socially responsible enterprise in Cuba: a positive role model for Corporate Social Responsibility?’
This article examines the unique institutional environment of socialist Cuba, where currently a process of controlled marketization and expansion of private enterprise is taking place. The article investigates business behaviour in Cuba with particular reference to implicit assumptions relating to socially responsible enterprise, or Corporate Social Responsibility (CSR) as the term is understood in Western Liberal Democracies. It draws upon a series of interviews with business practitioners and business commentators (both Cuban and non-Cuban residents on the island). The interviews focused on the participants’ awareness of business ethics and socially responsible enterprise, and the cultural differences in assumptions and expectations relating to the concept of CSR between the Cuban and non-Cuban interviewees. We find that Cuba at this early stage of tentative marketization presents a positive role model of socially responsible enterprise. Both the highly regulated State economy and the embedded norms and values of social equity that have emerged as a consequence of Cuba’s socialist revolution facilitate business social responsibility. The relevance of this research to current debates in relation to CSR is discussed and it is argued that capitalist economies may similarly benefit from tighter regulatory control and by cultivating more pro-social business norms that prioritise ethical over economic concerns.