The power and brake performance of wheeled construction machinery are separately detected on different test equipment in present chassis detection line. A new method is put forward in the veiw of high cost, large area occupied and low treatment efficiency of the traditional line. A DC dynamometer is provided as the power absorbing device and the reverse drag device to combine the two separate platforms in the proposed method, and the mathematical model of DC dynamometer is built based on the principle of chassis performance test. The parameter of dynamometer is determined by calculating, and power and brake detection integration of the wheeled construction machinery is achieved on the integrated test platform.

This paper introduces the influence of the shape, grain size, density and hardness of abrasives particles on nozzle wear. Different parameters of abrasive hardness are investigated through theoretic and experimental analysis. The results show that the ratio of abrasive hardness to nozzle material hardness governs the wear rate Ca.