Isolation Performance Evaluation of Compressor Vibration Isolating Systems Based on LMS Test. Lab Signature

2011 ◽  
Vol 130-134 ◽  
pp. 1220-1225 ◽  
Author(s):  
Li Zhang ◽  
Hao Chen ◽  
Yan Jue Gong ◽  
Hong Wu ◽  
Shuo Zhang
Keyword(s):  
Performance Evaluation ◽  
Evaluation Criteria ◽  
Maximum Velocity ◽  
Single Layer ◽  
National Standard ◽  
Vibration Velocity ◽  
Upward Trend ◽  
Refrigeration Unit ◽  
Comparison Results ◽  
Isolation Performance

In order to reduce vibration and noise of the compressor used in small and medium-sized refrigeration unit, this paper designs different vibration isolating systems and carries out experiment of isolation performance evaluation based on LMS Test. Lab Signature software. The comparison results of four different vibration isolating systems show that the peak values of vibration velocity response in each system mainly appear at 25Hz, 50Hz, 75Hz and 100Hz, and the maximum velocity does not exceed 22mm/s which is less than the maximum allowed by the national standard[1]. And the Vibration Level Difference (VLD) is taken as evaluation criteria for isolating vibration, that of single-layer vibration isolating system is within 10-20dB, and that of double-layer vibration isolating system is within 20-35dB. Furthermore with the increase of middle-mass, the VLD has a clear upward trend.

Experimental Modal Analysis of Compressor Vibration Isolating System Based on LMS Test.Lab

2011 ◽  
Vol 121-126 ◽  
pp. 3283-3288
Author(s):  
Li Zhang ◽  
Hao Chen ◽  
Yan Jue Gong ◽  
Jing Wang
Keyword(s):  
Resonance Frequency ◽  
Modal Analysis ◽  
Natural Frequency ◽  
Single Layer ◽  
Experimental Modal Analysis ◽  
Impact Testing ◽  
Modal Parameters ◽  
Isolation System ◽  
Refrigeration Unit ◽  
Comparison Results

In order to reduce vibration and noise of the compressor used in small and medium-sized refrigeration unit, this paper designs different vibration isolating systems and carries out experimental modal analysis based on LMS Test. Lab Impact Testing software. The comparison results of modal parameters of four different vibration isolating systems show that the natural frequency of single-layer vibration isolating system is higher than that of non-isolation system and effectively avoids the second order resonance frequency. Furthermore the natural frequency of double-layer vibration isolating system has reduced due to the additional middle-mass. And the system's natural frequency decreases obviously with the increase of middle-mass which is far from resonance frequency and significantly improve the effect of vibration isolating system.

Performance Evaluation Criteria for Heat Exchangers Based on First Law Analysis

2005 ◽  
Vol 12 (2) ◽  
pp. 121-158 ◽  
Author(s):  
M. Yilmaz ◽  
O. Comakli ◽  
S. Yapici ◽  
O. N. Sara
Keyword(s):  
Performance Evaluation ◽  
Heat Exchangers ◽  
Evaluation Criteria

EXERGOECONOMIC ANALYSIS ON ENHANCED HEAT TRANSFER SURFACES AT LOW TEMPERATURE

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3500-3502
Author(s):  
DENG-FANG RUAN ◽  
YOU-RONG LI ◽  
SHUANG-YING WU ◽  
BO LAN
Keyword(s):  
Heat Transfer ◽  
Performance Evaluation ◽  
Low Temperature ◽  
Evaluation Criteria ◽  
Enhanced Heat Transfer ◽  
Second Law Analysis ◽  
Augmentation Techniques ◽  
Transfer Cost ◽  
Exergoeconomic Analysis ◽  
New Criterion

The exergoeconomic analysis is carried out on enhanced heat transfer surfaces at low temperature. A new criterion for evaluating the performance of enhanced heat transfer surfaces at low temperature is proposed. It can be applied to various augmentation techniques and generalizes the performance evaluation criteria obtained by means of the first and second law analysis. The validity of the new performance evaluation criterion is illustrated by the analysis of heat transfer characteristics at low temperature and assessment of the heat transfer cost of two types of enhanced heat transfer surfaces.

The X factor that can help to motivate Generation Y

2015 ◽  
Vol 23 (1) ◽  
pp. 32-34 ◽  
Author(s):  
S.S. Sreejith
Keyword(s):  
Information Technology ◽  
Performance Evaluation ◽  
Evaluation System ◽  
Evaluation Criteria ◽  
Recognition System ◽  
Information Technology Workers ◽  
Content Type ◽  
Performance Evaluation System ◽  
Evaluation Systems ◽  
Effective Performance

Purpose – Explains why performance evaluation designed for manufacturers is inappropriate for information technology organizations. Design/methodology/approach – Underlines the distinctiveness of the information technology workforce and provides the basis for an effective performance- evaluation system designed for these workers. Findings – Highlights the roles of consensus and transparency in setting and modifying evaluation criteria. Practical implications – Urges the need for a fair and open rewards and recognition system to run in parallel with reformed performance evaluation. Social implications – Provides a way of updating performance evaluation systems to take account of the move from manufacturing to information technology-based jobs in many developed and developing societies. Originality/value – Reveals how best to recognize, reward and assess the performance of information technology workers.

scholarly journals Putting Psychology to the Test: Rethinking Model Evaluation Through Benchmarking and Prediction

2021 ◽  
Vol 4 (3) ◽  
pp. 251524592110268
Author(s):  
Roberta Rocca ◽  
Tal Yarkoni
Keyword(s):  
Machine Learning ◽  
Performance Evaluation ◽  
Model Evaluation ◽  
Evaluation Criteria ◽  
Model Performance ◽  
Scientific Models ◽  
Practical Utility ◽  
Model Performance Evaluation ◽  
Unseen Data ◽  
Reliable Model

Consensus on standards for evaluating models and theories is an integral part of every science. Nonetheless, in psychology, relatively little focus has been placed on defining reliable communal metrics to assess model performance. Evaluation practices are often idiosyncratic and are affected by a number of shortcomings (e.g., failure to assess models’ ability to generalize to unseen data) that make it difficult to discriminate between good and bad models. Drawing inspiration from fields such as machine learning and statistical genetics, we argue in favor of introducing common benchmarks as a means of overcoming the lack of reliable model evaluation criteria currently observed in psychology. We discuss a number of principles benchmarks should satisfy to achieve maximal utility, identify concrete steps the community could take to promote the development of such benchmarks, and address a number of potential pitfalls and concerns that may arise in the course of implementation. We argue that reaching consensus on common evaluation benchmarks will foster cumulative progress in psychology and encourage researchers to place heavier emphasis on the practical utility of scientific models.

scholarly journals INTEGRASI METODE ANP DAN TOPSIS DALAM EVALUASI KINERJA SUPPLIER DAN PENENTUAN PRIORITAS SUPPLIER BAHAN BAKU UTAMA CETAK KORAN PADA PT MASSCOM GRAPHY SEMARANG

2017 ◽  
Vol 11 (3) ◽  
pp. 151
Author(s):  
Darminto Pujotomo ◽  
Nia Budi Puspitasari ◽  
Dwi Rizkiyani
Keyword(s):  
Performance Evaluation ◽  
Raw Materials ◽  
Evaluation Criteria ◽  
Raw Material ◽  
Company Performance ◽  
Ideal Solution ◽  
Analytical Network Process ◽  
Supplier Performance ◽  
Network Process ◽  
Priority Order

Salah satu faktor yang mempengaruhi kinerja perusahaan adalah keberadaan supplier yang berperan sebagai pemasok kebutuhan atau penyedia bahan baku. PT Masscom Graphy Semarang merupakan perusahaan percetakan yang telah menjalin kerjasama dengan beberapa supplier untuk menjamin kelangsungan produksinya. Oleh karena itu evaluasi kinerja supplier sangat penting dilakukan oleh perusahaan untuk mendapatkan supplier yang handal dalam memasok bahan baku. Tujuan dalam penelitian ini adalah mengidentifikasi kriteria evaluasi kinerja supplier dan penentuan prioritas supplier yang sesuai dengan kebutuhan perusahaan, dan menentukan urutan prioritas supplier untuk bahan baku utama cetak koran. Terdapat 17 subkriteria yang digunakan dalam evaluasi kinerja supplier dan penentuan prioritas supplier. Metode Analytical Network Process (ANP) dapat dijadikan alternatif untuk suatu permasalahan yang memiliki banyak subkriteria yang saling berkaitan dalam pengambilan keputusan. Selanjutnya metode Technique For Orders Preference by Similarity to Ideal Solution (TOPSIS) digunakan untuk perankingan supplier. Berdasarkan pembobotan subkriteria dengan menggunakan ANP, subkriteria yang paling besar pengaruhnya dalam evaluasi supplier adalah harga penawaran sebesar 0,17227. Selanjutnya, penentuan prioritas supplier dilakukan dengan menggunakan metode TOPSIS dan didapatkan urutan supplier untuk bahan baku kertas CD roll adalah supplier A, B, C, dan D, sedangkan untuk bahan baku tinta web adalah supplier L, N, O, dan M.   ABSTRACT One of the factors that influence the company performance is the presence of suppliers which supplies raw materials. PT Masscom Graphy Semarang is a printing company which has cooperated with several suppliers to ensure continuity of production. Therefore,  supplier performance evaluation conducted by the company is very important to obtain a reliable supplier in the supply of raw materials. The purpose of this research was to identify the supplier performance evaluation criteria and priorities of suppliers in accordance with the company's needs, and determined the priority order of the main raw material supplier for newspaper print. There was 17 sub-criteria used in evaluating the performance of suppliers and prioritization of suppliers. Analytical Network Process (ANP) can be used as an alternative to solve a problem that had many interrelated sub-criteria or influence in decision making. Furthermore, the method Technique For Orders Preference by Similarity to Ideal Solution (TOPSIS) was used for ranking suppliers. Based on the weighted sub-criteria by using ANP, the most influence subcriteria in determining the priority of suppliers offering price of 0.17227. Furthermore, to the supplier prioritization was done by using the TOPSIS method and obtained the order suppliers for raw materials paper roll was a supplier A, B, C, and D, while the raw material for the ink web was a supplier of L, N, O and M.

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