Microscale Radial-Flow Compressor Impeller Made of Silicon Nitride: Manufacturing and Performance

2004 ◽  
Vol 126 (2) ◽  
pp. 358-365 ◽  
Author(s):  
Sangkyun Kang ◽  
James P. Johnston ◽  
Toshiyuki Arima ◽  
Minoru Matsunaga ◽  
Hideaki Tsuru ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
High Speed ◽  
Performance Testing ◽  
Turbine Generator ◽  
Compressor Impeller ◽  
Design Speed ◽  
And Performance ◽  
Flow Compressor ◽  
Shaft Unit ◽  
Full Design

A microscale, high-speed compressor impeller (12 mm diameter, 800,000 rpm) was tested for feasibility in regard to aerodynamic performance. The compressor was designed for application in a first-sized gas turbine generator. To survive high stresses at such high temperatures, the rotor was manufactured as a single turbine/compressor/shaft unit in silicon nitride, by the Mold SDM process. Performance testing was conducted in a cold-flow rig at reduced speed of 420,000 rpm. Results from a CFD code compared favorably to measured data at this speed. Extrapolation from test conditions to full design speed was accomplished by application of CFD applied at both speeds.

Micro-Scale Radial-Flow Compressor Impeller Made of Silicon Nitride: Manufacturing and Performance

2003 ◽  
Author(s):  
Sangkyun Kang ◽  
James P. Johnston ◽  
Toshiyuki Arima ◽  
Minoru Matsunaga ◽  
Hideaki Tsuru ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
High Speed ◽  
Performance Testing ◽  
Micro Scale ◽  
Compressor Impeller ◽  
Design Speed ◽  
And Performance ◽  
Flow Compressor ◽  
Shaft Unit ◽  
Full Design

A micro-scale, high-speed compressor impeller (12mm diameter, 800,000 rpm) was tested for feasibility in regard to aerodynamic performance. The compressor was designed for application in a fist-sized gas-turbine-generator. To survive high stresses at such high temperatures, the rotor was manufactured as a single turbine/compressor/shaft unit in silicon nitride, by the Mold SDM process. Performance testing was conducted in a cold-flow rig at reduced speed of 420,000 rpm. Results from a CFD code compared favorably to measured data at this speed. Extrapolation from test conditions to full design speed was accomplished by application of CFD applied at both speeds.

Design of vibration damping test mechanism for suspension system of high speed tracked vehicle based on vertical linkage decoupling

2021 ◽  
pp. 095440622110424
Author(s):  
Xuedong Liu ◽  
Yong Guo ◽  
Zhewu Chen ◽  
Juchuan Dai ◽  
Qihui Lin ◽  
...  
Keyword(s):  
Performance Optimization ◽  
High Speed ◽  
Performance Testing ◽  
Virtual Prototype ◽  
Vibration Damping ◽  
Suspension System ◽  
Contact Theory ◽  
Prototype Model ◽  
Tracked Vehicle ◽  
And Performance

The suspension test-rig is restricted by the compound swing motion of the load wheel in a high-speed tracked vehicle, and cannot test the damping performance for the suspension system of the high-speed tracked vehicle with the track. A vibration damping testing mechanism using vertical linkage to decouple the compound swing motion of the load wheel is proposed for suspension performance testing with the track. Using Hertz elastic contact theory to solve the stiffness coefficient between load wheel and excitation wheel, a virtual prototype model for vibration damping test mechanism with vertical linkage is established in ADAMS. Correctness of the virtual prototype model is verified by experiment. The motion decoupling ability of the vibration damping testing mechanism is verified by simulation. The dynamic characteristics for each pair of guide and slider in vibration damping testing mechanism are analyzed under the condition of maximum excitation force and displacement, and the selection criteria of slider and guide contained in the motion pair components are acquired. The mechanism decouples the compound swing motion of the load wheel successfully, and can make suspension system performance testing in high-precision for the high-speed tracked vehicle with track realized, playing an important role in parameters design and performance optimization for the high-speed tracked vehicle.

Digitalization system of ancient architecture decoration art based on neural network and image features

2020 ◽  
pp. 1-12
Author(s):  
Wu Xin ◽  
Qiu Daping
Keyword(s):  
Neural Network ◽  
Construction Industry ◽  
Three Dimensional ◽  
Performance Testing ◽  
Image Features ◽  
Three Dimensional Model ◽  
Performance Effect ◽  
Data Process ◽  
And Performance ◽  
Construction Mode

The inheritance and innovation of ancient architecture decoration art is an important way for the development of the construction industry. The data process of traditional ancient architecture decoration art is relatively backward, which leads to the obvious distortion of the digitalization of ancient architecture decoration art. In order to improve the digital effect of ancient architecture decoration art, based on neural network, this paper combines the image features to construct a neural network-based ancient architecture decoration art data system model, and graphically expresses the static construction mode and dynamic construction process of the architecture group. Based on this, three-dimensional model reconstruction and scene simulation experiments of architecture groups are realized. In order to verify the performance effect of the system proposed in this paper, it is verified through simulation and performance testing, and data visualization is performed through statistical methods. The result of the study shows that the digitalization effect of the ancient architecture decoration art proposed in this paper is good.

Sign in / Sign up

Export Citation Format

Share Document