This paper is concerned with the problem of measuring electric energy accurately under the large power dynamic (LPD) loads (e.g. arc furnaces in the steelmaking, high-speed train) testing conditions. The m-sequence pseudo-random dynamic testing (PrDT) signal parameter model is established. Meanwhile we analyze statistical properties of the PrDT signal model to prove that the model can represent typical characters of LPD loads and the testing signal is sparse in frequency domain. Then we design a deterministic optimal measurement matrix with the minimal measuring error and a novel Compressive Measurement (CM) measuring method is proposed. The CM measuring method can solve the problem of measuring electric energy accurately under the random dynamic testing signal conditions. Using the PrDT signal model, simulation has also been carried out based on different length and period of msequence. The results show that the metering errors of CM measuring method are small enough to be ignored.

Proficiency Testing (PT) and InterLaboratory Comparison (ILC) can provide many benefits to testing and calibration laboratories. The successful completion of a well-designed proficiency test can validate the measurement method, technical training, traceability of standards, and uncertainty budgets of the laboratory. Additionally, proficiency tests can provide a good indication about the quality of the reported results. The main goal of this intercomparison was the assessment of laboratories capabilities that perform calibrations within pressure field and a travelling measurement standard was used.

An independent assessment of the technical performance of laboratories is necessary, in order to assure the validity of measurement results[1]. The article presents the assessment of laboratories which participated at an inter-laboratory comparison (ILC) within reactive power field. A number of 23 laboratories had participated at this interlaboratories comparison [2] for a period of 10 months. Laboratories involved in this interlaboratories comparison perform verifications of reactive electrical energy meters. In order to make a correct assessment of these laboratories capabilitiesa travelling measurement standard was used.

The paper describes some problems concerning the evaluation of travelling standard drift effect and its further influence on evaluation key comparison reference value during a key comparison. The authors have demonstrated the evaluation procedure for drift effect when its model can be linear or not linear. Comparative analysis of the proposed procedure with other different approaches was done applying the electric power data of COOMET.EM-K5 key comparison. All the calculations were done in MATLAB.

To fulfill success of the space mission, the traversability of lunar/planetary exploration rover should be evaluated and fully understood with respect to the terrain properties. Meanwhile, wheel-soil interaction is extremely complicated, and thus numerical analysis is compared to experimental approach of mobility performance such as sinkage, drawbar pull. Also, the model of mobility performance is ultimately depends on experimentally determined terrain parameters. This paper describes two experimental methods used to identify the accurate terrain parameters in a lunar simulant. In addition, for the evaluation of mobility performance according to slip ratio and width of wheel in a lunar simulant, the wheel test bed of planetary exploration rover was assembled. Using the test bed, the preliminary experiments of the sinkage and drawbar pull according to variation of slip ratio and wheel width were carried out and evaluated. In addition, these experimental results were compared to the numerical analysis based on the wheel-terrain interaction model on lunar simulant.