Comprehensive modeling of a deflector jet pressure servo valve and analysis of key influences on the front stage.

The deflector jet pressure servo valve (DJPSV), a critical component of the aircraft brake servo system, requires a precise foundational model for performance analysis, optimization, and enhancement. However, the complexity of the jet process within the V-groove of the deflector plate presents challenges for accurate mathematical modeling. To address this issue, the paper takes the DJPSV as the research object, carries out detailed mathematical modeling of its components, analyzes the influencing factors of the performance of the key component-the front stage-and optimizes the design of the key factors.

Experimental investigation on pore characteristics of vitrain and durain in low rank coal based on fractal theory.

The macro petrographic compositions and its pore characteristics of coal reservoir play critical role in the accumulation and development of coalbed methane (CBM). In this paper, the pore characteristics of vitrain and durain were analyzed through the experiment and fractal theory. The results indicated that the micropores and microfractures develop in vitrain, and that transitional pores develop in durain.

Biologically inspired virtual aperture extension method of small aperture HFSWR multielement array.

We propose a method for extending the virtual aperture of the small aperture high-frequency surface wave radar multielement array inspired by a fly named. Despite the tremendous incompatibility between its ear and the incoming wavelength,can accurately local the sound of its host cricket. This ability benefits from the coupled structure of's ears which have been modelled as a mechanical vibration system.

Study on the emergency capacity of coal mine enterprises in Longdong Area based on D-FAHP method.

Emergency capability assessment is a complex system with multiple factors, variables and levels. Incomplete and uncertain assess information often occurs during assessment. Based on this, a method combining D-number theory and fuzzy analytic Hierarchy process (FAHP) is proposed to study the emergency capacity of coal enterprises in Longdong area.